Today's Message Index:
----------------------
1. 04:13 AM - Re: Digiflight 2.5" round hole cutout dimensions? (Jesse Saint)
2. 04:20 AM - Re: Fuel pressure problems (Tim Olson)
3. 04:20 AM - Re: Fuel pressure problems (Tim Olson)
4. 04:23 AM - Re: Fuel pressure problems (Tim Olson)
5. 04:56 AM - Re: Fuel Sender Gotchya (Patrick Thyssen)
6. 05:26 AM - Re: Fuel Sender Gotchya (gary)
7. 05:35 AM - Re: Fuel pressure problems (Sam)
8. 05:38 AM - Re: Fuel pressure problems (Sam)
9. 06:20 AM - Re: Fuel pressure problems (Rene Felker)
10. 06:46 AM - Re: Fuel pressure problems (David McNeill)
11. 06:51 AM - Re: Fuel Sender Gotchya (David McNeill)
12. 07:02 AM - Re: Fuel pressure problems (David McNeill)
13. 07:11 AM - Re: Fuel pressure problems (Sam)
14. 07:13 AM - Re: Fuel pressure problems (Sam)
15. 07:25 AM - Re: Fuel pressure problems (Sam)
16. 07:34 AM - Re: Fuel pressure problems (Rene Felker)
17. 08:07 AM - Re: Fuel pressure problems (David McNeill)
18. 08:14 AM - Re: Fuel pressure problems (David McNeill)
19. 09:37 AM - Re: Digiflight 2.5" round hole cutout dimensions? (Chris Johnston)
20. 11:24 AM - Re: Re: Neg Battery Cable Routing (Larry Rosen)
21. 12:13 PM - Muffler Backfire turning base to final (Bill DeRouchey)
22. 12:34 PM - Re: Muffler Backfire turning base to final (Gerry Filby)
23. 12:35 PM - Re: Re: Neg Battery Cable Routing (RV Builder (Michael Sausen))
24. 12:58 PM - Re: Muffler Backfire turning base to final (gary)
25. 02:04 PM - Re: Muffler Backfire turning base to final (Rob Kermanj)
26. 03:15 PM - Re: Vent lines (was fuel pressure problems) (Carl Froehlich)
27. 04:30 PM - Re: Vent lines (was fuel pressure problems) (Sam)
28. 04:39 PM - Re: Re: Neg Battery Cable Routing (David McNeill)
29. 06:20 PM - Re: Muffler Backfire turning base to final (GenGrumpy@aol.com)
30. 11:11 PM - Modular panel CAD drawing? (Chris Johnston)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Digiflight 2.5" round hole cutout dimensions? |
Chris,
It is a standard 2.25" instrument hole. A 2.25" circle with a 1.85"
concentric square with screw holes centered at the 4 corners of the
square.
Jesse Saint
Saint Aviation, Inc.
jesse@saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Mar 18, 2008, at 11:28 PM, Chris Johnston wrote:
> Hey all -
>
> Does anyone have a cad drawing of the cutout for the round version
> of the Digiflight2? or the exact dimensions? I'm trying to lay out
> my panel, and there's no drawing in the Trutrak documentation that I
> could find. anyone?
>
> thanks
>
> cj
> <winmail.dat>
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
You may have something there, because while I can't say with 100%
certainty, most of the time I think it's also with full fuel,
and at high climb angles, and I know it's usually when climbing
like I do here....say 900AGL up to 8-10K'msl. So the symptoms
sound very much alike. It really seems benign as I get plenty
of audio warning and turn on the boost....but, even the couple
times I've let it ride it doesn't seem to go too low. I never
thought about the breather, but that's an idea.
Tim Olson - RV-10 N104CD - Flying
Scott Schmidt wrote:
> OK, here is my theory on this one because I have the same issue.
> It only occurs for me if I am climbing out for an extended period of
> time with full fuel tanks.
>
> What I believe happens is that the breather tubes get filled with fuel
> and as you start to burn fuel it cannot bring air into the tank because
> of the "column" of fuel above the breather which causes low fuel
> pressure warnings. I have found that if I level off it is immediately
> gone or if I make sure there is 1-2" below the filler neck I don't get
> this problem.
> By leveling off and turning on the fuel pump, I think it can clear the
> breather and everything starts to work fine.
> This is just my theory but something you may want to look at. I'd be
> interested to see if it happens with tanks at 3/4 or at lower angles of
> attack.
> You would think that the full tanks would have a good column of fuel to
> supply the pickup with plenty of pressure but possibly at high angle of
> attacks (which causes the fuel to have to flow "uphill") combined with
> fuel in the breather causing a low pressure in the tanks may just be
> enough to cause this issue.
>
> I have also correlated it to climb outs that are greater than 4000 feet
> (could just be extended climbs again) but everytime I fill the tanks
> completely full and takeoff from a sea level airport and climb to 10k+
> feet it seems to occur.
>
> I've been wanted to sit down and work out the math, I know someone out
> there would love to do that.
>
> Scott Schmidt
>
>
>
> ----- Original Message ----
> From: Tim Olson <Tim@myrv10.com>
> To: rv10-list@matronics.com
> Sent: Tuesday, March 18, 2008 8:15:59 AM
> Subject: Re: RV10-List: Fuel pressure problems
>
> <mailto:Tim@myrv10.com>>
>
> The closest thing I can relate to this is a very very intermittent
> thing....something I only see on a handful of flights, and usually
> just in warmer temps.
>
> If you climb at low airspeeds, like try to do a 90-100kt climb
> on a hot day, I start to see a drop in fuel pressure. It starts
> to fluctuate a bit, and then will start to drop. My audio warnings
> fire up under about 12psi, so I don't run it too low to see how
> it goes....I usually hit the boost, and drop the nose for better
> cooling. Once you drop the nose and get more cooling airflow,
> it goes away. Also, note that this happens in climb, when you
> have lots of fuel flow. As soon as I level off, lean out, and
> the fuel flows drop, it doesn't do it anymore. So, my guess is
> that with high flow requirements in climb, and high heat, they
> combine and produce low and fluctuating pressure. Since dropping
> the nose has shown to eliminate the problem (like climbing at
> 120kts if I see this happening) and since pulling back the mixture
> takes care of it once level, that is my best guess. But, as I
> said, it isn't something I see very often...just on the hot
> days or where I've done extended climbs...maybe see it 10-15
> times a season...or something like that, but that's over 100-200
> hours a season.
>
> At one point I had tried to order a fuel pump cooling shroud
> but the place didn't get them in stock. One of these days
> I still would like to try that, along with perhaps some
> heat shielding foam over the fuel lines forward of the
> firewall. But, my thought is, if you get your cowl set up
> with great cooling, it's probably something you wouldn't
> see too often.
>
> I'm not 100% sure of any of this....but it is something to
> consider.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
>
>
> Sam wrote:
> > That's what I thought to, but when I turn on the boost pump, it
> > immediately returns to normal pressure.
> >
> > Jesse Saint wrote:
> <jesse@saintaviation.com <mailto:jesse@saintaviation.com>>
> >>
> >> That sounds like a sensor issue, maybe either a bad crimp or a bad
> ground.
> >> Don't ask me how I might know.
> >>
> >> do not archive.
> >>
> >> Jesse Saint
> >> Saint Aviation, Inc.
> >> jesse@saintaviation.com <mailto:jesse@saintaviation.com>
> >> www.saintaviation.com <http://www.saintaviation.com>
> >> 352-427-0285
> >>
> >> Sam wrote:
> >>
> >>> The first fifty hours were trouble free, as far as fuel pressure goes,
> >>> but now for the past 40 hours or so, I'm getting fuel pressure
> >>> fluctuation's. Normally the F/P runs in the mid to low 20's, but now
> >>> constantly fluctuates from 8 to 27 psi. The engine runs ok, but it's
> >>> disconcerting. Has anybody experienced this on an IO540D4A5 before,
> >>> would the engine actually keep running if the F/P was really down
> to 8psi?
> >>> Sam Marlow
> >>> #40157
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> &g t;>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>< br>>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > *
> >
> >
> > - The RV10-List Email Forum Use the Matronics List Features
> Navigator to the many List utilities such as List Archive Search &
> Download, 7-Day Browse, Chat, Photoshare, and much much -->
> - MATRONICS WEB FORUMS Same great content also available via the Web -->
> - List Contribution Web Site Thank you for your generous
> -Matt Dralle, List -->
>
> *
>
>
> *
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
I'm pretty sure mine are, per plans....but I don't know how
much real ram air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward. This
> is intened to provide a positve "ram" pressure to the vent lines if they
> contain fuel.
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
I have not, but I've rarely landed with less than 5 or 6 gallons in
a tank, and when the fuel is under 10 gal I treat it like my old
sundowner than was placarded against extended slips for the same
reason.....I just fly crabbed in for those approaches.
I've also done some slips with and without flaps and not seen
issues...while we're talking about slips.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> Another thought. Anybody experienced engine failure in an extended slip
> or steep turn into the selected tank. Given that the fuel pickup is on
> the inboard end the selected tank could unport considering the fuel level.
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel Sender Gotchya |
Gary with your JPI did you have just four wires going to your fuel sending units
from the 950 or did you have a little box coming out with the four wires.
Just wondering I had another box converting resistance to voltage.
Thanks
Patrick Thyssen
gary <speckter@comcast.net> wrote:
I have been fighting communication problems between JPI engine monitor and
my EFIS. It would not show my fuel gauge. After much frustration we
discovered that the software that was shipped with the JPI monitor was
flawed and did not have the appropriate place to indicate the fuel tanks.
After going on line and downloading the newest software all is well.
So those of you with JPI stuff put this in the memory banks for when you get
to programming stuff. Several wasted weeks and many wasted hours.
Gary
40274
DAR Inspection Scheduled.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
> *
>
>
> *
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel Sender Gotchya |
I had 3 wires coming out of the JPI, L tank, R tank, and ground going
directly to the Resistive units. I did have the correct "resistive" box in
the ez-config, but my original software for ez-config did not let me check a
left and right tank configuration. Hope that makes sense.
Gary
40274
DAR Inspection Scheduled
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Patrick Thyssen
Sent: Wednesday, March 19, 2008 7:53 AM
Subject: Re: RV10-List: Fuel Sender Gotchya
Gary with your JPI did you have just four wires going to your fuel sending
units from the 950 or did you have a little box coming out with the four
wires.
Just wondering I had another box converting resistance to voltage.
Thanks
Patrick Thyssen
gary <speckter@comcast.net> wrote:
I have been fighting communication problems between JPI engine monitor and
my EFIS. It would not show my fuel gauge. After much frustration we
discovered that the software that was shipped with the JPI monitor was
flawed and did not have the appropriate place to indicate the fuel tanks.
After going on line and downloading the newest software all is well.
So those of you with JPI stuff put this in the memory banks for when you get
to programming stuff. Several wasted weeks and many wasted hours.
Gary
40274
DAR Inspection Scheduled.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>< BR>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
> *
>
>
>
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
You might be on the something there Scott. I know that after the fuel is
lower in the tank, the fuel pressure stabilizes. Not sure how much lower
than full though.
I wonder if a NACA vent would help? It's non icing, and would pressurize
the tank slightly. Both are desirable features.
Sam
Scott Schmidt wrote:
> OK, here is my theory on this one because I have the same issue.
> It only occurs for me if I am climbing out for an extended period of
> time with full fuel tanks.
>
> What I believe happens is that the breather tubes get filled with fuel
> and as you start to burn fuel it cannot bring air into the tank
> because of the "column" of fuel above the breather which causes low
> fuel pressure warnings. I have found that if I level off it is
> immediately gone or if I make sure there is 1-2" below the filler neck
> I don't get this problem.
> By leveling off and turning on the fuel pump, I think it can clear the
> breather and everything starts to work fine.
> This is just my theory but something you may want to look at. I'd be
> interested to see if it happens with tanks at 3/4 or at lower angles
> of attack.
> You would think that the full tanks would have a good column of fuel
> to supply the pickup with plenty of pressure but possibly at high
> angle of attacks (which causes the fuel to have to flow "uphill")
> combined with fuel in the breather causing a low pressure in the tanks
> may just be enough to cause this issue.
>
> I have also correlated it to climb outs that are greater than 4000
> feet (could just be extended climbs again) but everytime I fill the
> tanks completely full and takeoff from a sea level airport and climb
> to 10k+ feet it seems to occur.
>
> I've been wanted to sit down and work out the math, I know someone out
> there would love to do that.
>
> Scott Schmidt
>
>
> ----- Original Message ----
> From: Tim Olson <Tim@myrv10.com>
> To: rv10-list@matronics.com
> Sent: Tuesday, March 18, 2008 8:15:59 AM
> Subject: Re: RV10-List: Fuel pressure problems
>
> <mailto:Tim@myrv10.com>>
>
> The closest thing I can relate to this is a very very intermittent
> thing....something I only see on a handful of flights, and usually
> just in warmer temps.
>
> If you climb at low airspeeds, like try to do a 90-100kt climb
> on a hot day, I start to see a drop in fuel pressure. It starts
> to fluctuate a bit, and then will start to drop. My audio warnings
> fire up under about 12psi, so I don't run it too low to see how
> it goes....I usually hit the boost, and drop the nose for better
> cooling. Once you drop the nose and get more cooling airflow,
> it goes away. Also, note that this happens in climb, when you
> have lots of fuel flow. As soon as I level off, lean out, and
> the fuel flows drop, it doesn't do it anymore. So, my guess is
> that with high flow requirements in climb, and high heat, they
> combine and produce low and fluctuating pressure. Since dropping
> the nose has shown to eliminate the problem (like climbing at
> 120kts if I see this happening) and since pulling back the mixture
> takes care of it once level, that is my best guess. But, as I
> said, it isn't something I see very often...just on the hot
> days or where I've done extended climbs...maybe see it 10-15
> times a season...or something like that, but that's over 100-200
> hours a season.
>
> At one point I had tried to order a fuel pump cooling shroud
> but the place didn't get them in stock. One of these days
> I still would like to try that, along with perhaps some
> heat shielding foam over the fuel lines forward of the
> firewall. But, my thought is, if you get your cowl set up
> with great cooling, it's probably something you wouldn't
> see too often.
>
> I'm not 100% sure of any of this....but it is something to
> consider.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
>
>
> Sam wrote:
> > That's what I thought to, but when I turn on the boost pump, it
> > immediately returns to normal pressure.
> >
> > Jesse Saint wrote:
> <jesse@saintaviation.com <mailto:jesse@saintaviation.com>>
> >>
> >> That sounds like a sensor issue, maybe either a bad crimp or a bad
> ground.
> >> Don't ask me how I might know.
> >>
> >> do not archive.
> >>
> >> Jesse Saint
> >> Saint Aviation, Inc.
> >> jesse@saintaviation.com <mailto:jesse@saintaviation.com>
> >> www.saintaviation.com <http://www.saintaviation.com>
> >> 352-427-0285
> >>
> >> Sam wrote:
> >>
> >>> The first fifty hours were trouble free, as far as fuel pressure goes,
> >>> but now for the past 40 hours or so, I'm getting fuel pressure
> >>> fluctuation's. Normally the F/P runs in the mid to low 20's, but now
> >>> constantly fluctuates from 8 to 27 psi. The engine runs ok, but it's
> >>> disconcerting. Has anybody experienced this on an IO540D4A5 before,
> >>> would the engine actually keep running if the F/P was really down
> to 8psi?
> >>> Sam Marlow
> >>> #40157
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> &g t;>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>< br>>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > *
> >
> >
> > - The RV10-List Email Forum Use the Matronics List Features
> Navigator to the many List utilities such as List Archive Search &
> Download, 7-Day Browse, Chat, Photoshare, and much much -->
> - MATRONICS WEB FORUMS Same great content also available via the Web
> --> - List Contribution Web Site Thank you for your generous
> -Matt Dralle, List -->
> *
>
>
> *
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
My vents are plans built, and are straight cut. That could make a
difference, I know in the 70's we had an AD on PA32's to cut the vent
lines at an angle.
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
> ------------------------------------------------------------------------
> *From:* owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Scott Schmidt
> *Sent:* Tuesday, March 18, 2008 10:11 PM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: Fuel pressure problems
>
> OK, here is my theory on this one because I have the same issue.
> It only occurs for me if I am climbing out for an extended period of
> time with full fuel tanks.
>
> What I believe happens is that the breather tubes get filled with fuel
> and as you start to burn fuel it cannot bring air into the tank
> because of the "column" of fuel above the breather which causes low
> fuel pressure warnings. I have found that if I level off it is
> immediately gone or if I make sure there is 1-2" below the filler neck
> I don't get this problem.
> By leveling off and turning on the fuel pump, I think it can clear the
> breather and everything starts to work fine.
> This is just my theory but something you may want to look at. I'd be
> interested to see if it happens with tanks at 3/4 or at lower angles
> of attack.
> You would think that the full tanks would have a good column of fuel
> to supply the pickup with plenty of pressure but possibly at high
> angle of attacks (which causes the fuel to have to flow "uphill")
> combined with fuel in the breather causing a low pressure in the tanks
> may just be enough to cause this issue.
>
> I have also correlated it to climb outs that are greater than 4000
> feet (could just be extended climbs again) but everytime I fill the
> tanks completely full and takeoff from a sea level airport and climb
> to 10k+ feet it seems to occur.
>
> I've been wanted to sit down and work out the math, I know someone out
> there would love to do that.
>
> Scott Schmidt
>
>
> ----- Original Message ----
> From: Tim Olson <Tim@myrv10.com>
> To: rv10-list@matronics.com
> Sent: Tuesday, March 18, 2008 8:15:59 AM
> Subject: Re: RV10-List: Fuel pressure problems
>
> <mailto:Tim@myrv10.com>>
>
> The closest thing I can relate to this is a very very intermittent
> thing....something I only see on a handful of flights, and usually
> just in warmer temps.
>
> If you climb at low airspeeds, like try to do a 90-100kt climb
> on a hot day, I start to see a drop in fuel pressure. It starts
> to fluctuate a bit, and then will start to drop. My audio warnings
> fire up under about 12psi, so I don't run it too low to see how
> it goes....I usually hit the boost, and drop the nose for better
> cooling. Once you drop the nose and get more cooling airflow,
> it goes away. Also, note that this happens in climb, when you
> have lots of fuel flow. As soon as I level off, lean out, and
> the fuel flows drop, it doesn't do it anymore. So, my guess is
> that with high flow requirements in climb, and high heat, they
> combine and produce low and fluctuating pressure. Since dropping
> the nose has shown to eliminate the problem (like climbing at
> 120kts if I see this happening) and since pulling back the mixture
> takes care of it once level, that is my best guess. But, as I
> said, it isn't something I see very often...just on the hot
> days or where I've done extended climbs...maybe see it 10-15
> times a season...or something like that, but that's over 100-200
> hours a season.
>
> At one point I had tried to order a fuel pump cooling shroud
> but the place didn't get them in stock. One of these days
> I still would like to try that, along with perhaps some
> heat shielding foam over the fuel lines forward of the
> firewall. But, my thought is, if you get your cowl set up
> with great cooling, it's probably something you wouldn't
> see too often.
>
> I'm not 100% sure of any of this....but it is something to
> consider.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
>
>
> Sam wrote:
> > That's what I thought to, but when I turn on the boost pump, it
> > immediately returns to normal pressure.
> >
> > Jesse Saint wrote:
> <jesse@saintaviation.com <mailto:jesse@saintaviation.com>>
> >>
> >> That sounds like a sensor issue, maybe either a bad crimp or a bad
> ground.
> >> Don't ask me how I might know.
> >>
> >> do not archive.
> >>
> >> Jesse Saint
> >> Saint Aviation, Inc.
> >> jesse@saintaviation.com <mailto:jesse@saintaviation.com>
> >> www.saintaviation.com <http://www.saintaviation.com>
> >> 352-427-0285
> >>
> >> Sam wrote:
> >>
> >>> The first fifty hours were trouble free, as far as fuel pressure goes,
> >>> but now for the past 40 hours or so, I'm getting fuel pressure
> >>> fluctuation's. Normally the F/P runs in the mid to low 20's, but now
> >>> constantly fluctuates from 8 to 27 psi. The engine runs ok, but it's
> >>> disconcerting. Has anybody experienced this on an IO540D4A5 before,
> >>> would the engine actually keep running if the F/P was really down
> to 8psi?
> >>> Sam Marlow
> >>> #40157
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> &g t;>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>< br>>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > *
> >
> >
> > - The RV10-List Email Forum Use the Matronics List Features
> Navigator to the many List utilities such as List Archive Search &
> Download, 7-Day Browse, Chat, Photoshare, and much much -->
> - MATRONICS WEB FORUMS Same great content also available via the Web
> --> - List Contribution Web Site Thank you for your generous
> -Matt Dralle, List -->
> *
>
> href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
> *
> *
>
>
> *
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
Sam, just to make sure I am understanding. But, first I have not seen this
problem in my first 5 hours..but the plans do call for the vents to be cut
and face forward. Do you have yours cut straight?
Rene' Felker
RV-10 N423CF Flying
801-721-6080
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Sam
Sent: Wednesday, March 19, 2008 6:36 AM
Subject: Re: RV10-List: Fuel pressure problems
My vents are plans built, and are straight cut. That could make a
difference, I know in the 70's we had an AD on PA32's to cut the vent lines
at an angle.
David McNeill wrote:
By breather tubes , are you referring to the vent lines? If so do you have
the tips of the vent lines cut diagonally and facing forward. This is
intened to provide a positve "ram" pressure to the vent lines if they
contain fuel.
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Scott Schmidt
Sent: Tuesday, March 18, 2008 10:11 PM
Subject: Re: RV10-List: Fuel pressure problems
OK, here is my theory on this one because I have the same issue.
It only occurs for me if I am climbing out for an extended period of time
with full fuel tanks.
What I believe happens is that the breather tubes get filled with fuel and
as you start to burn fuel it cannot bring air into the tank because of the
"column" of fuel above the breather which causes low fuel pressure warnings.
I have found that if I level off it is immediately gone or if I make sure
there is 1-2" below the filler neck I don't get this problem.
By leveling off and turning on the fuel pump, I think it can clear the
breather and everything starts to work fine.
This is just my theory but something you may want to look at. I'd be
interested to see if it happens with tanks at 3/4 or at lower angles of
attack.
You would think that the full tanks would have a good column of fuel to
supply the pickup with plenty of pressure but possibly at high angle of
attacks (which causes the fuel to have to flow "uphill") combined with fuel
in the breather causing a low pressure in the tanks may just be enough to
cause this issue.
I have also correlated it to climb outs that are greater than 4000 feet
(could just be extended climbs again) but everytime I fill the tanks
completely full and takeoff from a sea level airport and climb to 10k+ feet
it seems to occur.
I've been wanted to sit down and work out the math, I know someone out there
would love to do that.
Scott Schmidt
----- Original Message ----
From: Tim Olson <mailto:Tim@myrv10.com> <Tim@myrv10.com>
Sent: Tuesday, March 18, 2008 8:15:59 AM
Subject: Re: RV10-List: Fuel pressure problems
The closest thing I can relate to this is a very very intermittent
thing....something I only see on a handful of flights, and usually
just in warmer temps.
If you climb at low airspeeds, like try to do a 90-100kt climb
on a hot day, I start to see a drop in fuel pressure. It starts
to fluctuate a bit, and then will start to drop. My audio warnings
fire up under about 12psi, so I don't run it too low to see how
it goes....I usually hit the boost, and drop the nose for better
cooling. Once you drop the nose and get more cooling airflow,
it goes away. Also, note that this happens in climb, when you
have lots of fuel flow. As soon as I level off, lean out, and
the fuel flows drop, it doesn't do it anymore. So, my guess is
that with high flow requirements in climb, and high heat, they
combine and produce low and fluctuating pressure. Since dropping
the nose has shown to eliminate the problem (like climbing at
120kts if I see this happening) and since pulling back the mixture
takes care of it once level, that is my best guess. But, as I
said, it isn't something I see very often...just on the hot
days or where I've done extended climbs...maybe see it 10-15
times a season...or something like that, but that's over 100-200
hours a season.
At one point I had tried to order a fuel pump cooling shroud
but the place didn't get them in stock. One of these days
I still would like to try that, along with perhaps some
heat shielding foam over the fuel lines forward of the
firewall. But, my thought is, if you get your cowl set up
with great cooling, it's probably something you wouldn't
see too often.
I'm not 100% sure of any of this....but it is something to
consider.
Tim Olson - RV-10 N104CD - Flying
do not archive
Sam wrote:
> That's what I thought to, but when I turn on the boost pump, it
> immediately returns to normal pressure.
>
> Jesse Saint wrote:
>>
>> That sounds like a sensor issue, maybe either a bad crimp or a bad
ground.
>> Don't ask me how I might know.
>>
>> do not archive.
>>
>> Jesse Saint
>> Saint Aviation, Inc.
>> jesse@saintaviation.com
>> www.saintaviation.com
>> 352-427-0285
>>
>> Sam wrote:
>>
>>> The first fifty hours were trouble free, as far as fuel pressure goes,
>>> but now for the past 40 hours or so, I'm getting fuel pressure
>>> fluctuation's. Normally the F/P runs in the mid to low 20's, but now
>>> constantly fluctuates from 8 to 27 psi. The engine runs ok, but it's
>>> disconcerting. Has anybody experienced this on an IO540D4A5 before,
>>> would the engine actually keep running if the F/P was really down to
8psi?
>>> Sam Marlow
>>> #40157
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
&g t;>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>< br>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
> *
>
>
> - The RV10-List Email Forum Use the Matronics List Features
Navigator to the many List utilities such as List Archive Search & Download,
7-Day Browse, Chat, Photoshare, and much much --> - MATRONICS
WEB FORUMS Same great content also available via the Web --> -
List Contribution Web Site Thank you for your generous
-Matt Dralle, List -->
href= <http://www.matronics.com/Navigator?RV10-List>
"http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navi
gator?RV10-List
href= <http://forums.matronics.com>
"http://forums.matronics.com">http://forums.matronics.com
href= <http://www.matronics.com/contribution>
"http://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com
/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contri
bution
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
I'm pretty sure mine are, per plans....but I don't know how much real ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel Sender Gotchya |
One other gotcha on the resistance units from Vans. If , when bending the
hangar for the float, the bend going through the sender is slightly more
than 90, it can "hang in the empty position. I first thought I had a
defective sender even though resistance changed. I submerged the float in a
bucket of gasoline and the float hung.. a slight rebend fixed the problem.
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of gary
Sent: Wednesday, March 19, 2008 5:22 AM
Subject: RE: RV10-List: Fuel Sender Gotchya
I had 3 wires coming out of the JPI, L tank, R tank, and ground going
directly to the Resistive units. I did have the correct "resistive" box in
the ez-config, but my original software for ez-config did not let me check a
left and right tank configuration. Hope that makes sense.
Gary
40274
DAR Inspection Scheduled
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Patrick Thyssen
Sent: Wednesday, March 19, 2008 7:53 AM
Subject: Re: RV10-List: Fuel Sender Gotchya
Gary with your JPI did you have just four wires going to your fuel sending
units from the 950 or did you have a little box coming out with the four
wires.
Just wondering I had another box converting resistance to voltage.
Thanks
Patrick Thyssen
gary <speckter@comcast.net> wrote:
I have been fighting communication problems between JPI engine monitor and
my EFIS. It would not show my fuel gauge. After much frustration we
discovered that the software that was shipped with the JPI monitor was
flawed and did not have the appropriate place to indicate the fuel tanks.
After going on line and downloading the newest software all is well.
So those of you with JPI stuff put this in the memory banks for when you get
to programming stuff. Several wasted weeks and many wasted hours.
Gary
40274
DAR Inspection Scheduled.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>< BR>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
> *
>
>
>
http://www.matronics.com/contribution
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
One other thing I have done is drill a small (50) hole in the vent line
inside the fairing. This does not affect the tam pressure much and provides
an alternate vent in case of icing. Since the caps are not vented, an icing
of the forward facing vent line could close the vent and result in fuel
starvation and/or deformed tank.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 6:43 AM
Subject: RE: RV10-List: Fuel pressure problems
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
I'm pretty sure mine are, per plans....but I don't know how much real ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
Yes, mine are straight, I'll check that this afternoon. Thanks for
asking, that could be the answer.
Rene Felker wrote:
>
> Sam, just to make sure I am understanding. But, first I have not seen
> this problem in my first 5 hours.but the plans do call for the vents
> to be cut and face forward. Do you have yours cut straight?
>
> Rene' Felker
>
> RV-10 N423CF Flying
>
> 801-721-6080
>
> ------------------------------------------------------------------------
>
> *From:* owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Sam
> *Sent:* Wednesday, March 19, 2008 6:36 AM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: Fuel pressure problems
>
> My vents are plans built, and are straight cut. That could make a
> difference, I know in the 70's we had an AD on PA32's to cut the vent
> lines at an angle.
>
> David McNeill wrote:
>
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
> ------------------------------------------------------------------------
>
> *From:* owner-rv10-list-server@matronics.com
> <mailto:owner-rv10-list-server@matronics.com>
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Scott Schmidt
> *Sent:* Tuesday, March 18, 2008 10:11 PM
> *To:* rv10-list@matronics.com <mailto:rv10-list@matronics.com>
> *Subject:* Re: RV10-List: Fuel pressure problems
>
> OK, here is my theory on this one because I have the same issue.
> It only occurs for me if I am climbing out for an extended period of
> time with full fuel tanks.
>
> What I believe happens is that the breather tubes get filled with fuel
> and as you start to burn fuel it cannot bring air into the tank
> because of the "column" of fuel above the breather which causes low
> fuel pressure warnings. I have found that if I level off it is
> immediately gone or if I make sure there is 1-2" below the filler neck
> I don't get this problem.
> By leveling off and turning on the fuel pump, I think it can clear the
> breather and everything starts to work fine.
> This is just my theory but something you may want to look at. I'd be
> interested to see if it happens with tanks at 3/4 or at lower angles
> of attack.
> You would think that the full tanks would have a good column of fuel
> to supply the pickup with plenty of pressure but possibly at high
> angle of attacks (which causes the fuel to have to flow "uphill")
> combined with fuel in the breather causing a low pressure in the tanks
> may just be enough to cause this issue.
>
> I have also correlated it to climb outs that are greater than 4000
> feet (could just be extended climbs again) but everytime I fill the
> tanks completely full and takeoff from a sea level airport and climb
> to 10k+ feet it seems to occur.
>
> I've been wanted to sit down and work out the math, I know someone out
> there would love to do that.
>
> Scott Schmidt
>
> ----- Original Message ----
> From: Tim Olson <Tim@myrv10.com> <mailto:Tim@myrv10.com>
> To: rv10-list@matronics.com <mailto:rv10-list@matronics.com>
> Sent: Tuesday, March 18, 2008 8:15:59 AM
> Subject: Re: RV10-List: Fuel pressure problems
>
> <mailto:Tim@myrv10.com>>
>
> The closest thing I can relate to this is a very very intermittent
> thing....something I only see on a handful of flights, and usually
> just in warmer temps.
>
> If you climb at low airspeeds, like try to do a 90-100kt climb
> on a hot day, I start to see a drop in fuel pressure. It starts
> to fluctuate a bit, and then will start to drop. My audio warnings
> fire up under about 12psi, so I don't run it too low to see how
> it goes....I usually hit the boost, and drop the nose for better
> cooling. Once you drop the nose and get more cooling airflow,
> it goes away. Also, note that this happens in climb, when you
> have lots of fuel flow. As soon as I level off, lean out, and
> the fuel flows drop, it doesn't do it anymore. So, my guess is
> that with high flow requirements in climb, and high heat, they
> combine and produce low and fluctuating pressure. Since dropping
> the nose has shown to eliminate the problem (like climbing at
> 120kts if I see this happening) and since pulling back the mixture
> takes care of it once level, that is my best guess. But, as I
> said, it isn't something I see very often...just on the hot
> days or where I've done extended climbs...maybe see it 10-15
> times a season...or something like that, but that's over 100-200
> hours a season.
>
> At one point I had tried to order a fuel pump cooling shroud
> but the place didn't get them in stock. One of these days
> I still would like to try that, along with perhaps some
> heat shielding foam over the fuel lines forward of the
> firewall. But, my thought is, if you get your cowl set up
> with great cooling, it's probably something you wouldn't
> see too often.
>
> I'm not 100% sure of any of this....but it is something to
> consider.
>
> Tim Olson - RV-10 N104CD - Flying
> do not archive
>
>
> Sam wrote:
> > That's what I thought to, but when I turn on the boost pump, it
> > immediately returns to normal pressure.
> >
> > Jesse Saint wrote:
> <jesse@saintaviation.com <mailto:jesse@saintaviation.com>>
> >>
> >> That sounds like a sensor issue, maybe either a bad crimp or a bad
> ground.
> >> Don't ask me how I might know.
> >>
> >> do not archive.
> >>
> >> Jesse Saint
> >> Saint Aviation, Inc.
> >> jesse@saintaviation.com <mailto:jesse@saintaviation.com>
> >> www.saintaviation.com <http://www.saintaviation.com>
> >> 352-427-0285
> >>
> >> Sam wrote:
> >>
> >>> The first fifty hours were trouble free, as far as fuel pressure goes,
> >>> but now for the past 40 hours or so, I'm getting fuel pressure
> >>> fluctuation's. Normally the F/P runs in the mid to low 20's, but now
> >>> constantly fluctuates from 8 to 27 psi. The engine runs ok, but it's
> >>> disconcerting. Has anybody experienced this on an IO540D4A5 before,
> >>> would the engine actually keep running if the F/P was really down
> to 8psi?
> >>> Sam Marlow
> >>> #40157
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> &g t;>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>< br>>>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > *
> >
> >
> > - The RV10-List Email Forum Use the Matronics List Features Navigator
> to the many List utilities such as List Archive Search & Download,
> 7-Day Browse, Chat, Photoshare, and much much --> - MATRONICS WEB
> FORUMS Same great content also available via the Web --> - List
> Contribution Web Site Thank you for your generous -Matt Dralle, List -->
>
> * *
> * *
> *href="http://www.matronics.com/Navigator?RV10-List" <http://www.matronics.com/Navigator?RV10-List>>http://www.matronics.com/Navigator?RV10-List*
> *href="http://forums.matronics.com" <http://forums.matronics.com>>http://forums.matronics.com*
> *href="http://www.matronics..com/contribution" <http://www.matronics.com/contribution>>http://www.matronics.com/c*
> * *
> * *
> * href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List*
> * href="http://forums.matronics.com">http://forums.matronics..com*
> * href="http://www.matronics.com/contribution">http://www.matronics.com/contribution*
> * *
>
> * *
> * *
> **
> **
> **
> *http://www.matronics.com/Navigator?RV10-List*
> **
> *http://forums.matronics.com*
> **
> **
> **
> * *
> *
>
>
> *
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
Yes, the angle would be important. That's another thing I could check on
the PA32.
David McNeill wrote:
>
> Depending on angle and cut of the vent it seems that a low pressure area
> could be created at the vent entrance
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
> Sent: Wednesday, March 19, 2008 4:18 AM
> To: rv10-list@matronics.com
> Subject: Re: RV10-List: Fuel pressure problems
>
>
> I'm pretty sure mine are, per plans....but I don't know how much real ram
> air pressure is generated there.
>
> Tim Olson - RV-10 N104CD - Flying
>
>
> David McNeill wrote:
>
>> By breather tubes , are you referring to the vent lines? If so do you
>> have the tips of the vent lines cut diagonally and facing forward.
>> This is intened to provide a positve "ram" pressure to the vent lines
>> if they contain fuel.
>>
>>
>
>
>
Message 15
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Fuel pressure problems |
I was in light icing on Sunday, coming back from the Cayman Islands, and
that was the first thing that crossed my mine. I wasn't to worried about
the wing, but that little cold soaked 1/4 vent tube, had my stomach in
knots!
David McNeill wrote:
>
> One other thing I have done is drill a small (50) hole in the vent line
> inside the fairing. This does not affect the tam pressure much and provides
> an alternate vent in case of icing. Since the caps are not vented, an icing
> of the forward facing vent line could close the vent and result in fuel
> starvation and/or deformed tank.
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
> Sent: Wednesday, March 19, 2008 6:43 AM
> To: rv10-list@matronics.com
> Subject: RE: RV10-List: Fuel pressure problems
>
>
> Depending on angle and cut of the vent it seems that a low pressure area
> could be created at the vent entrance
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
> Sent: Wednesday, March 19, 2008 4:18 AM
> To: rv10-list@matronics.com
> Subject: Re: RV10-List: Fuel pressure problems
>
>
> I'm pretty sure mine are, per plans....but I don't know how much real ram
> air pressure is generated there.
>
> Tim Olson - RV-10 N104CD - Flying
>
>
> David McNeill wrote:
>
>> By breather tubes , are you referring to the vent lines? If so do you
>> have the tips of the vent lines cut diagonally and facing forward.
>> This is intened to provide a positve "ram" pressure to the vent lines
>> if they contain fuel.
>>
>>
>
>
>
>
>
>
Message 16
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
I was debating on whether or not to put the hole in the vent tubes because
and I had everything buttoned up and ready for inspection. I was going
through a final inspection I noted that I had the tubes on the wrong sides
and the opening was pointing backwards. So since I had to pull them anyway
I put the hole in. I am hoping I will never need the holes......no icing.
I wonder how much fuel I would have vented with the tubes in
backwards.....since it is a sealed system I don't think it would have been
much.
Rene' Felker
RV-10 N423CF Flying
801-721-6080
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 7:59 AM
Subject: RE: RV10-List: Fuel pressure problems
One other thing I have done is drill a small (50) hole in the vent line
inside the fairing. This does not affect the tam pressure much and provides
an alternate vent in case of icing. Since the caps are not vented, an icing
of the forward facing vent line could close the vent and result in fuel
starvation and/or deformed tank.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 6:43 AM
Subject: RE: RV10-List: Fuel pressure problems
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
I'm pretty sure mine are, per plans....but I don't know how much real ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
Message 17
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
I think I may have solved his problem
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Sam
Sent: Wednesday, March 19, 2008 7:22 AM
Subject: Re: RV10-List: Fuel pressure problems
I was in light icing on Sunday, coming back from the Cayman Islands, and
that was the first thing that crossed my mine. I wasn't to worried about the
wing, but that little cold soaked 1/4 vent tube, had my stomach in knots!
David McNeill wrote:
<dlm46007@cox.net>
One other thing I have done is drill a small (50) hole in the vent line
inside the fairing. This does not affect the tam pressure much and provides
an alternate vent in case of icing. Since the caps are not vented, an icing
of the forward facing vent line could close the vent and result in fuel
starvation and/or deformed tank.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 6:43 AM
Subject: RE: RV10-List: Fuel pressure problems
<dlm46007@cox.net>
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
<Tim@myrv10.com>
I'm pretty sure mine are, per plans....but I don't know how much real ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
By breather tubes , are you referring to the vent lines? If so do you
have the tips of the vent lines cut diagonally and facing forward.
This is intened to provide a positve "ram" pressure to the vent lines
if they contain fuel.
Message 18
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Fuel pressure problems |
Probably not much after the internal tube end got above the fuel level;
however it would still be possible to vent after a turn that immersed the
internal tube end near the outboard edge. I have seen fuel venting in my
Glastar in a moderate turn after takeoff with all tanks to the filler neck.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Rene Felker
Sent: Wednesday, March 19, 2008 7:32 AM
Subject: RE: RV10-List: Fuel pressure problems
I was debating on whether or not to put the hole in the vent tubes because
and I had everything buttoned up and ready for inspection. I was going
through a final inspection I noted that I had the tubes on the wrong sides
and the opening was pointing backwards. So since I had to pull them anyway
I put the hole in. I am hoping I will never need the holes......no icing.
I wonder how much fuel I would have vented with the tubes in
backwards.....since it is a sealed system I don't think it would have been
much.
Rene' Felker
RV-10 N423CF Flying
801-721-6080
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 7:59 AM
Subject: RE: RV10-List: Fuel pressure problems
One other thing I have done is drill a small (50) hole in the vent line
inside the fairing. This does not affect the tam pressure much and provides
an alternate vent in case of icing. Since the caps are not vented, an icing
of the forward facing vent line could close the vent and result in fuel
starvation and/or deformed tank.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 6:43 AM
Subject: RE: RV10-List: Fuel pressure problems
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
I'm pretty sure mine are, per plans....but I don't know how much real ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
> By breather tubes , are you referring to the vent lines? If so do you
> have the tips of the vent lines cut diagonally and facing forward.
> This is intened to provide a positve "ram" pressure to the vent lines
> if they contain fuel.
>
Message 19
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Digiflight 2.5" round hole cutout dimensions? |
Sweet! That's exactly what I needed.
Cj
Do not archive
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Jesse Saint
Sent: Wednesday, March 19, 2008 4:09 AM
Subject: Re: RV10-List: Digiflight 2.5" round hole cutout dimensions?
Chris,
It is a standard 2.25" instrument hole. A 2.25" circle with a 1.85"
concentric square with screw holes centered at the 4 corners of the
square.
Jesse Saint
Saint Aviation, Inc.
jesse@saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694
On Mar 18, 2008, at 11:28 PM, Chris Johnston wrote:
> Hey all -
>
> Does anyone have a cad drawing of the cutout for the round version
> of the Digiflight2? or the exact dimensions? I'm trying to lay out
> my panel, and there's no drawing in the Trutrak documentation that I
> could find. anyone?
>
> thanks
>
> cj
> <winmail.dat>
Message 20
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Neg Battery Cable Routing |
The advantage to running the ground cable forward is that it will
eliminate ground loops and it gives a efficient path from the starter
ground back to the battery.
The negatives are well stated by Deems.
I would like some feed back from those that have grounded the battery
locally. How is it working? Are you having any issues with ground loops?
Larry Rosen
#356
orchidman wrote:
>
>
> Deems Davis wrote:
>
>> ...For aircraft like the RV-10 where the
>> standard battery mount position is in the rear of the aircraft. Bob saw
>> no problems in grounding the batteries locally (i.e. to the airframe at
>> the battery location) and avoiding the weight, expense and complexity of
>> running the additional heavy cable forward to the common firewall ground.
>>
>
> Bob is located only about 2 1/2 hours away but I have never attended his seminar.
I have his books.
> I know there are people flying that have done both and I am trying to see which
might be better and any problems some might have had with either approach.
> Are there any advantages or needs to having a Neg cable going to the firewall
in the -10?
>
> --------
> Gary Blankenbiller
> RV10 - # 40674
> Fuselage SB
> (N410GB reserved)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=170739#170739
>
>
>
Message 21
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Muffler Backfire turning base to final |
Flying RV10s-
I have a consistent problem of backfiring through the mufflers as I come off
the throttle. Don't think it is dangerous but scares the passengers.
If I reduce the throttle slowly then it does not backfire. There is no exhaust
gasket leak at the heads. Believe the idle mixture is adjusted correctly. Originally,
I thought the joints in the exhaust pipes were leaking and would seal
with carbon - but it has not happened in 170 hours.
Anyone with a similar problem? Any suggested solutions?
Thanks,
Bill DeRouchey
N939SB, flying with a few pops now and then
Message 22
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Muffler Backfire turning base to final |
Have the same problem on my RV-9 (IO-320 AFP, Injection, Hartzell constant
speed) particularly if the engine is windmilling fast and I chop the
throttle all the way out. I've heard its common and the solution is to
reduce speed gradually so that you're not chopping throttle at high RPM.
Also reduce throttle gradually, but it sounds like you're already doing that
...
g
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Bill DeRouchey
Sent: Wednesday, March 19, 2008 12:09 PM
Subject: RV10-List: Muffler Backfire turning base to final
Flying RV10s-
I have a consistent problem of backfiring through the mufflers as I come off
the throttle. Don't think it is dangerous but scares the passengers.
If I reduce the throttle slowly then it does not backfire. There is no
exhaust gasket leak at the heads. Believe the idle mixture is adjusted
correctly. Originally, I thought the joints in the exhaust pipes were
leaking and would seal with carbon - but it has not happened in 170 hours.
Anyone with a similar problem? Any suggested solutions?
Thanks,
Bill DeRouchey
N939SB, flying with a few pops now and then
Message 23
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Neg Battery Cable Routing |
For me the decision was fairly easy. Big engine, lot's of cold weather time.
Any advantage to cold starting is welcomed for me. If I still lived in Texas
I probably wouldn't worry much about grounding back at the battery mount. I'll
be through bolting the neg cable at the firewall and using that point as the
airframe ground and the point for all the avionics up front. I'm also using
#2 welding cable all the way to the starter. Might be overkill but I'll never
have to worry about if the cable from the battery to the starter is the problem
when it won't turn over.
Michael
-----Original Message-----
From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Larry Rosen
Sent: Wednesday, March 19, 2008 1:21 PM
Subject: Re: RV10-List: Re: Neg Battery Cable Routing
The advantage to running the ground cable forward is that it will
eliminate ground loops and it gives a efficient path from the starter
ground back to the battery.
The negatives are well stated by Deems.
I would like some feed back from those that have grounded the battery
locally. How is it working? Are you having any issues with ground loops?
Larry Rosen
#356
orchidman wrote:
>
>
> Deems Davis wrote:
>
>> ...For aircraft like the RV-10 where the
>> standard battery mount position is in the rear of the aircraft. Bob saw
>> no problems in grounding the batteries locally (i.e. to the airframe at
>> the battery location) and avoiding the weight, expense and complexity of
>> running the additional heavy cable forward to the common firewall ground.
>>
>
> Bob is located only about 2 1/2 hours away but I have never attended his seminar.
I have his books.
> I know there are people flying that have done both and I am trying to see which
might be better and any problems some might have had with either approach.
> Are there any advantages or needs to having a Neg cable going to the firewall
in the -10?
>
> --------
> Gary Blankenbiller
> RV10 - # 40674
> Fuselage SB
> (N410GB reserved)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=170739#170739
>
>
Message 24
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Muffler Backfire turning base to final |
In my experience your mixture is set too lean on the fuel servo. Enrich it
by a turn or turn and a half and see if that helps.
Gary
40274
DAR Inspection scheduled
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Gerry Filby
Sent: Wednesday, March 19, 2008 3:31 PM
Subject: RE: RV10-List: Muffler Backfire turning base to final
Have the same problem on my RV-9 (IO-320 AFP, Injection, Hartzell constant
speed) particularly if the engine is windmilling fast and I chop the
throttle all the way out. I've heard its common and the solution is to
reduce speed gradually so that you're not chopping throttle at high RPM.
Also reduce throttle gradually, but it sounds like you're already doing that
...
g
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Bill DeRouchey
Sent: Wednesday, March 19, 2008 12:09 PM
Subject: RV10-List: Muffler Backfire turning base to final
Flying RV10s-
I have a consistent problem of backfiring through the mufflers as I come off
the throttle. Don't think it is dangerous but scares the passengers.
If I reduce the throttle slowly then it does not backfire. There is no
exhaust gasket leak at the heads. Believe the idle mixture is adjusted
correctly. Originally, I thought the joints in the exhaust pipes were
leaking and would seal with carbon - but it has not happened in 170 hours.
Anyone with a similar problem? Any suggested solutions?
Thanks,
Bill DeRouchey
N939SB, flying with a few pops now and then
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com
/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 25
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Muffler Backfire turning base to final |
Idle mixture too lean. You need to turn 650-700 RPM and have a MP of
11-12. Adjust your mixture on the ground to meet this spec. I had
the same problem.
Rob.
On Mar 19, 2008, at 3:09 PM, Bill DeRouchey wrote:
> Flying RV10s-
> I have a consistent problem of backfiring through the mufflers as I
> come off the throttle. Don't think it is dangerous but scares the
> passengers.
>
> If I reduce the throttle slowly then it does not backfire. There is
> no exhaust gasket leak at the heads. Believe the idle mixture is
> adjusted correctly. Originally, I thought the joints in the exhaust
> pipes were leaking and would seal with carbon - but it has not
> happened in 170 hours.
>
> Anyone with a similar problem? Any suggested solutions?
>
> Thanks,
> Bill DeRouchey
> N939SB, flying with a few pops now and then
>
>
Message 26
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Vent lines (was fuel pressure problems) |
On my RV-8A I transitioned the =BC=94 vent tubing to 3/8=94 about 6=94
before
exiting the bottom of the fuselage. I also epoxied a piece of aluminum
screen on the bevel end cut that faces into the wind. I read someplace
that
a few RVs had problems with mud dabbers plugging up the vent line.
I=92ll do
the same on the RV-10.
Carl Froehlich
RV8A (400 hrs)
RV-10 (wings)
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Sam
Sent: Wednesday, March 19, 2008 10:22 AM
Subject: Re: RV10-List: Fuel pressure problems
I was in light icing on Sunday, coming back from the Cayman Islands, and
that was the first thing that crossed my mine. I wasn't to worried about
the
wing, but that little cold soaked 1/4 vent tube, had my stomach in
knots!
David McNeill wrote:
<mailto:dlm46007@cox.net>
<dlm46007@cox.net>
One other thing I have done is drill a small (50) hole in the vent line
inside the fairing. This does not affect the tam pressure much and
provides
an alternate vent in case of icing. Since the caps are not vented, an
icing
of the forward facing vent line could close the vent and result in fuel
starvation and/or deformed tank.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
Sent: Wednesday, March 19, 2008 6:43 AM
Subject: RE: RV10-List: Fuel pressure problems
<mailto:dlm46007@cox.net>
<dlm46007@cox.net>
Depending on angle and cut of the vent it seems that a low pressure area
could be created at the vent entrance
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Wednesday, March 19, 2008 4:18 AM
Subject: Re: RV10-List: Fuel pressure problems
<Tim@myrv10.com>
I'm pretty sure mine are, per plans....but I don't know how much real
ram
air pressure is generated there.
Tim Olson - RV-10 N104CD - Flying
David McNeill wrote:
By breather tubes , are you referring to the vent lines? If so do you
have the tips of the vent lines cut diagonally and facing forward.
This is intened to provide a positve "ram" pressure to the vent lines
if they contain fuel.
Message 27
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Vent lines (was fuel pressure problems) |
Well, I just got back from the hangar, and I'm embarrassed to say, but I
didn't finish the vents before they were installed. Thy were not only
straight cut but about an inch or more to long. They are standard now
though, except for the right one, and I added a vent inside the faring
just in case of an inadvertent icing encounter.We'll see how that works
out on the next test flight. Just to low of a ceiling to fly today.
Sam
Carl Froehlich wrote:
>
> On my RV-8A I transitioned the " vent tubing to 3/8" about 6" before
> exiting the bottom of the fuselage. I also epoxied a piece of
> aluminum screen on the bevel end cut that faces into the wind. I read
> someplace that a few RVs had problems with mud dabbers plugging up the
> vent line. I'll do the same on the RV-10.
>
>
>
> Carl Froehlich
>
> RV8A (400 hrs)
>
> RV-10 (wings)
>
>
>
> ------------------------------------------------------------------------
>
> *From:* owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Sam
> *Sent:* Wednesday, March 19, 2008 10:22 AM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: Fuel pressure problems
>
>
>
> I was in light icing on Sunday, coming back from the Cayman Islands,
> and that was the first thing that crossed my mine. I wasn't to worried
> about the wing, but that little cold soaked 1/4 vent tube, had my
> stomach in knots!
>
> David McNeill wrote:
>
>
> One other thing I have done is drill a small (50) hole in the vent line
> inside the fairing. This does not affect the tam pressure much and provides
> an alternate vent in case of icing. Since the caps are not vented, an icing
> of the forward facing vent line could close the vent and result in fuel
> starvation and/or deformed tank.
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com <mailto:owner-rv10-list-server@matronics.com>
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of David McNeill
> Sent: Wednesday, March 19, 2008 6:43 AM
> To: rv10-list@matronics.com <mailto:rv10-list@matronics.com>
> Subject: RE: RV10-List: Fuel pressure problems
>
>
> Depending on angle and cut of the vent it seems that a low pressure area
> could be created at the vent entrance
>
> -----Original Message-----
> From: owner-rv10-list-server@matronics.com <mailto:owner-rv10-list-server@matronics.com>
> [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Tim Olson
> Sent: Wednesday, March 19, 2008 4:18 AM
> To: rv10-list@matronics.com <mailto:rv10-list@matronics.com>
> Subject: Re: RV10-List: Fuel pressure problems
>
>
> I'm pretty sure mine are, per plans....but I don't know how much real ram
> air pressure is generated there.
>
> Tim Olson - RV-10 N104CD - Flying
>
>
> David McNeill wrote:
>
>> By breather tubes , are you referring to the vent lines? If so do you
>> have the tips of the vent lines cut diagonally and facing forward.
>> This is intened to provide a positve "ram" pressure to the vent lines
>> if they contain fuel.
>>
>>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> * *
> * *
> **
> **
> **
> *http://www.matronics.com/Navigator?RV10-List*
> **
> *http://forums.matronics.com*
> **
> **
> **
> * *
> *
>
>
> *
Message 28
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Neg Battery Cable Routing |
Have you considered two Odyssey batteries in parallel with two masters? My
setup can dump both batteries into the starter 1200A+ to start and 500a for
a minute or so.
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of RV Builder
(Michael Sausen)
Sent: Wednesday, March 19, 2008 12:32 PM
Subject: RE: RV10-List: Re: Neg Battery Cable Routing
--> <rvbuilder@sausen.net>
For me the decision was fairly easy. Big engine, lot's of cold weather
time. Any advantage to cold starting is welcomed for me. If I still lived
in Texas I probably wouldn't worry much about grounding back at the battery
mount. I'll be through bolting the neg cable at the firewall and using that
point as the airframe ground and the point for all the avionics up front.
I'm also using #2 welding cable all the way to the starter. Might be
overkill but I'll never have to worry about if the cable from the battery to
the starter is the problem when it won't turn over.
Michael
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Larry Rosen
Sent: Wednesday, March 19, 2008 1:21 PM
Subject: Re: RV10-List: Re: Neg Battery Cable Routing
The advantage to running the ground cable forward is that it will eliminate
ground loops and it gives a efficient path from the starter ground back to
the battery.
The negatives are well stated by Deems.
I would like some feed back from those that have grounded the battery
locally. How is it working? Are you having any issues with ground loops?
Larry Rosen
#356
orchidman wrote:
>
>
> Deems Davis wrote:
>
>> ...For aircraft like the RV-10 where the standard battery mount
>> position is in the rear of the aircraft. Bob saw no problems in
>> grounding the batteries locally (i.e. to the airframe at the battery
>> location) and avoiding the weight, expense and complexity of running
>> the additional heavy cable forward to the common firewall ground.
>>
>
> Bob is located only about 2 1/2 hours away but I have never attended his
seminar. I have his books.
> I know there are people flying that have done both and I am trying to see
which might be better and any problems some might have had with either
approach.
> Are there any advantages or needs to having a Neg cable going to the
firewall in the -10?
>
> --------
> Gary Blankenbiller
> RV10 - # 40674
> Fuselage SB
> (N410GB reserved)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=170739#170739
>
>
Message 29
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Muffler Backfire turning base to final |
I had same problem during flyoff hours.
I did not change idle mixture.
What I did do is start reducing power slowly on descent and in the pattern,
and richen the mixture up at the same time. Have not had the problem since.
grumpy
do not archive
In a message dated 3/19/2008 4:06:27 P.M. Central Daylight Time,
flysrv10@gmail.com writes:
Idle mixture too lean. You need to turn 650-700 RPM and have a MP of 11-12.
Adjust your mixture on the ground to meet this spec. I had the same
problem.
Rob.
On Mar 19, 2008, at 3:09 PM, Bill DeRouchey wrote:
Flying RV10s-
I have a consistent problem of backfiring through the mufflers as I come off
the throttle. Don't think it is dangerous but scares the passengers.
If I reduce the throttle slowly then it does not backfire. There is no
exhaust gasket leak at the heads. Believe the idle mixture is adjusted correctly.
Originally, I thought the joints in the exhaust pipes were leaking and would
seal with carbon - but it has not happened in 170 hours.
Anyone with a similar problem? Any suggested solutions?
Thanks,
Bill DeRouchey
N939SB, flying with a few pops now and then
http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
(http://www.matronics.com/Navigator?RV10-List)
(http://www.matronics.com/contribution)
**************Create a Home Theater Like the Pros. Watch the video on AOL
Home.
(http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom00030000000001)
Message 30
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Modular panel CAD drawing? |
Hey all -
more drawing questions! Does anyone know where to get a CAD drawing of
the modular panel that Stein sells? I'm trying to lay out this panel,
and I can't find this drawing anywhere. anyone? I just don't think I
can measure the thing accurately enough to draw it with the precision
that I need.
cj
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|