Today's Message Index:
----------------------
1. 09:05 AM - TMXIO-540 and GAMI injectors (Alan Mekler)
2. 09:58 AM - Fuel Flow Transducer Relocation (Robin Marks)
3. 11:50 AM - Re: TMXIO-540 and GAMI injectors (John Cox)
4. 12:40 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen)
5. 12:42 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen)
6. 02:24 PM - Re: TMXIO-540 and GAMI injectors (Patrick Thyssen)
7. 03:26 PM - Re: TMXIO-540 and GAMI injectors (Bob Turner)
8. 03:38 PM - Egt probes (GRT) (DLM)
9. 04:00 PM - Re: TMXIO-540 and GAMI injectors (Alan Mekler)
10. 05:08 PM - Re: Egt probes (GRT) (Kelly McMullen)
11. 05:33 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen)
12. 05:47 PM - Re: TMXIO-540 and GAMI injectors (Alan Mekler)
13. 06:51 PM - Re: Fuel Flow Transducer Relocation (Phillip Perry)
14. 09:12 PM - Re: Fuel Flow Transducer Relocation (Robin Marks)
15. 09:32 PM - Re: Fuel Flow Transducer Relocation (Dave Saylor)
16. 11:38 PM - Miniumum fuel comfort zone (AirMike)
Message 1
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| Subject: | TMXIO-540 and GAMI injectors |
I have been trying the GAMI injectors( on the 4th set now) but found the
fuel flow on the cylinders varies widely. My cylinder #5 has the richest
injector and it still peaks a gallon or more before the other cylinders
Before gamis it was 2.5 gallons.. Has any one had this problem? Any
solutions?
GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours
on the engine and all compressions are good. No intake leaks.
Alan
N668G
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| Subject: | Fuel Flow Transducer Relocation |
Since new my Fuel Flow readings varied widely during flight with the
transducer living in the recommended and what should be it=92s ideal locati
on
in the tunnel we decided to take action. I would experience well over 1 GPH
swings in the readings with a lot of bouncing in the FF Rate. When I turned
on the boost pump I would get reading up to 2.5 GPH more than actual fuel
burn. This made injector tuning nearly impossible even when reviewing EFIS
data. The erratic and inaccurate FF figures aversively effected my EFIS fue
l
totalize always indicating more fuel burned than was actually the case. The
fuel pressure readings tended to bounce around too causing low fuel pressur
e
warnings especially on climb out.
As others have suggested & done in the past we took the drastic step of
relocating the FF Transducer from the tunnel to forward of the injector
throttle body between the throttle body and the spider. This modification
while time consuming did correct the fuel flow issue both in standard fligh
t
and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs.
wild swings of well over 1 GPH.
Robin
Message 3
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| Subject: | TMXIO-540 and GAMI injectors |
My experience with the GAMI's are a limited range of corrective sizes. As
a graduate of Airflow Performance's school in South Carolina, I have a paro
chial bias as to their techniques and the diverse range of injector ports f
or the Lycoming 540 product line. It goes as afar as believing they are ev
en superior to Brand A used by that fine Canadian rebuilder of such deep re
spect with this group.
I feel GAMI is an excellent choice for aircraft with Continental propulsion
products. Beech, Cirrus, and Oh forbid - Lancair International (plastic p
lanes).
I will get off the soapbox cause I use, repair and maintain Lycomings in RV
s and on the M-14Ps with single point fuel bodies. Bendix/Precision is fin
e for its purpose.
Oh yeh, Fuel Injection for the Rotax found in RV-12s too. Did the Rotax tr
aining in Canada.
John Cox
From: Alan Mekler
Sent: Sat 8/21/2010 9:04 AM
Subject: RV10-List: TMXIO-540 and GAMI injectors
I have been trying the GAMI injectors( on the 4th set now) but found the f
uel flow on the cylinders varies widely. My cylinder #5 has the richest in
jector and it still peaks a gallon or more before the other cylinders Befor
e gamis it was 2.5 gallons.. Has any one had this problem? Any solutions?
GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours
on the engine and all compressions are good. No intake leaks.
Alan
N668G
Message 4
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| Subject: | Re: TMXIO-540 and GAMI injectors |
Most likely cause is the location of your fuel flow sending unit, as
Robin just noted. Fuel flow that peaks 1 gph different between
cylinders would not run worth a damn. I am assuming that is not the
case because you didn't mention any issues with how the engine ran.
So I seriously question the validity of your fuel flow data. Lycomings
generally are within 0.6 gph with stock injectors. But GAMI cannot
correct for inaccurate FF readings relative to peak egts.
On Sat, Aug 21, 2010 at 9:04 AM, Alan Mekler <amekler@metrocast.net> wrote:
> I have been trying the GAMI injectors( on the 4th set now) but found the
> fuel flow on the cylinders varies widely. My cylinder #5 has the richest
> injector and it still peaks a gallon or more before the other cylinders
> Before gamis it was 2.5 gallons.. Has any one had this problem? Any
> solutions?
>
> GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours
> on the engine and all compressions are good. No intake leaks.
>
> Alan
>
> N668G
>
>
Message 5
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| Subject: | Re: TMXIO-540 and GAMI injectors |
One other possible cause is ignition, IF you have the stock Slick
magnetos. Slick magnetos generally work okay, but some have wildly
inaccurate firing between cylinders. I know of one turbocharged
TIO-540 that was balanced perfectly and ran fine LOP until one of the
mags was overhauled. After that it simply would not run LOP, was too
rough.
On Sat, Aug 21, 2010 at 12:39 PM, Kelly McMullen <apilot2@gmail.com> wrote:
> Most likely cause is the location of your fuel flow sending unit, as
> Robin just noted. Fuel flow that peaks 1 gph different between
> cylinders would not run worth a damn. I am assuming that is not the
> case because you didn't mention any issues with how the engine ran.
> So I seriously question the validity of your fuel flow data. Lycomings
> generally are within 0.6 gph with stock injectors. But GAMI cannot
> correct for inaccurate FF readings relative to peak egts.
>
> On Sat, Aug 21, 2010 at 9:04 AM, Alan Mekler <amekler@metrocast.net> wrote:
>> I have been trying the GAMI injectors( on the 4th set now) but found the
>> fuel flow on the cylinders varies widely. My cylinder #5 has the richest
>> injector and it still peaks a gallon or more before the other cylinders
>> Before gamis it was 2.5 gallons.. Has any one had this problem? Any
>> solutions?
>>
>> GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours
>> on the engine and all compressions are good. No intake leaks.
>>
>> Alan
>>
>> N668G
>>
>>
>>
>
Message 6
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| Subject: | Re: TMXIO-540 and GAMI injectors |
? Have you done the coke bottle check? Has anyone messed with the lines fro
m the spider to injectors? Are we sure the lines are the right ones? The ot
her thing have you had any problems with your EGT system. Could your EGT pr
obes be bad?
Peaking or not peaking where they should?
Just a few thoughts
Patrick Thyssen
--- On Sat, 8/21/10, Alan Mekler <amekler@metrocast.net> wrote:
From: Alan Mekler <amekler@metrocast.net>
Subject: RV10-List: TMXIO-540 and GAMI injectors
=0A=0A=0A =0A =0A=0A=0A=0A=0A=0A=0AI have been trying the GAMI injectors( o
n the 4th=0Aset now)- but found the fuel flow on -the cylinders varies
widely. My cylinder=0A#5 has the richest injector and it still peaks a gall
on or more before the=0Aother cylinders Before gamis it was 2.5 gallons.. H
as any one had this problem?=0AAny solutions? =0A=0AGAMI does not why the f
uel is so unbalanced in this engine.=0AI have 95 hours on the engine and al
l compressions are good. No intake leaks. =0A=0AAlan =0A=0AN668G =0A=0A=0A
=0A=0A=0A=0A=0A=0A
Message 7
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| Subject: | Re: TMXIO-540 and GAMI injectors |
I second the last post. Do easy things first. Do the "coke bottle test" to be sure
the "richest injector" cylinder really does get more gas than the others.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309674#309674
Message 8
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| Subject: | Egt probes (GRT) |
Another probe failed this morning. That makes 5 failures in 310 hours
TTSN. This cylinder has not failed earlier so it was probably the lower
quality probe. I will swap it out next week with an Electronics
International to determine whether they are a better solution. They
claim that the probe will last 2000 hours. My EGTS are operated usually
between 1200-1420 F. For brief moments during leaning, some may range
from 1420-1450 but are immediately brought under 1420 with mixture
control. My usual cruise provides EGT range from 1375-1420. Yet probes
have failed five times: cylinders 1(once), 2(twice), 6 (once) and now 3.
Four failures occurred between 200-300 hours TTSN. I am installing an EI
P-110; I had EI engine instrumentation for my Glastar and in 530 hours
had no failures of either EGT or CHT probes.
Message 9
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| Subject: | TMXIO-540 and GAMI injectors |
Patrick,
Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l than
my richest cylinder #3. After changing to GAMIs (my 3rd set) I'm down to a
1 gallon spread. GAMI has given me the richest injector they make for
cylinder # 5 but it still peaks early.
Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm.
Alan
13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow
gal/hr
1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1
1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2
1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3
1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4
1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5
1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6
other method
cylinder #1 1472 peak @ 11.5
cylinder #2 1451 peak@ 11.2
cylinder #3 1472 peak @ 11.1
cylinder#4 1477 peak @ 11.2
cylinder #5 1473 peak @ 12.1
cylinder #6 1474 peak @ 11.5
_____
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Patrick Thyssen
Sent: Saturday, August 21, 2010 5:22 PM
Subject: Re: RV10-List: TMXIO-540 and GAMI injectors
? Have you done the coke bottle check? Has anyone messed with the lines from
the spider to injectors? Are we sure the lines are the right ones? The other
thing have you had any problems with your EGT system. Could your EGT probes
be bad?
Peaking or not peaking where they should?
Just a few thoughts
Patrick Thyssen
--- On Sat, 8/21/10, Alan Mekler <amekler@metrocast.net> wrote:
From: Alan Mekler <amekler@metrocast.net>
Subject: RV10-List: TMXIO-540 and GAMI injectors
I have been trying the GAMI injectors( on the 4th set now) but found the
fuel flow on the cylinders varies widely. My cylinder #5 has the richest
injector and it still peaks a gallon or more before the other cylinders
Before gamis it was 2.5 gallons.. Has any one had this problem? Any
solutions?
GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours
on the engine and all compressions are good. No intake leaks.
Alan
N668G
Message 10
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| Subject: | Re: Egt probes (GRT) |
I don't recall the exact hours in service, but have had no failures on
the fast response EI EGT probes on my 200hp Mooney running cruise EGTs
in the 1350-1500 range, mounted exactly 1.5" from the cylinder flange of
exhaust stack. Installed them several years ago. Only failures have been
a couple leads/connections from the probes, easily fixed with new
connector and crimper.
On 8/21/2010 3:34 PM, DLM wrote:
> Another probe failed this morning. That makes 5 failures in 310 hours
> TTSN. This cylinder has not failed earlier so it was probably the
> lower quality probe. I will swap it out next week with an Electronics
> International to determine whether they are a better solution. They
> claim that the probe will last 2000 hours. My EGTS are operated
> usually between 1200-1420 F. For brief moments during leaning, some
> may range from 1420-1450 but are immediately brought under 1420 with
> mixture control. My usual cruise provides EGT range from 1375-1420.
> Yet probes have failed five times: cylinders 1(once), 2(twice), 6
> (once) and now 3. Four failures occurred between 200-300 hours TTSN. I
> am installing an EI P-110; I had EI engine instrumentation for my
> Glastar and in 530 hours had no failures of either EGT or CHT probes.
> *
>
>
> *
Message 11
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| Subject: | Re: TMXIO-540 and GAMI injectors |
Perhaps you are working on the wrong end of the problem. #3&4 are
peaking last, so must be too rich. The rest of the cylinders are peaking
within 0.4gph of #5. You also will need to gather measurements every 0.2
gph to better detect the peaks once you get those two cylinders closer
to the rest.
On 8/21/2010 3:59 PM, Alan Mekler wrote:
>
> Patrick,
>
> Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l
> than my richest cylinder #3. After changing to GAMIs (my 3^rd set) Im
> down to a 1 gallon spread. GAMI has given me the richest injector they
> make for cylinder # 5 but it still peaks early.
>
> Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm.
>
> Alan
>
> 13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow gal/hr
>
> 1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1
>
> 1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2
>
> 1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3
>
> 1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4
>
> 1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5
>
> 1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6
>
> other method
>
> cylinder #1 1472 peak @ 11.5
>
> cylinder #2 1451 peak@ 11.2
>
> cylinder #3 1472 peak @ 11.1
>
> cylinder#4 1477 peak @ 11.2
>
> cylinder #5 1473 peak @ 12.1
>
> cylinder #6 1474 peak @ 11.5
>
> ------------------------------------------------------------------------
>
> *From:* owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Patrick
> Thyssen
> *Sent:* Saturday, August 21, 2010 5:22 PM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: TMXIO-540 and GAMI injectors
>
> ? Have you done the coke bottle check? Has anyone messed with the
> lines from the spider to injectors? Are we sure the lines are the
> right ones? The other thing have you had any problems with your EGT
> system. Could your EGT probes be bad?
> Peaking or not peaking where they should?
> Just a few thoughts
> Patrick Thyssen
>
> --- On *Sat, 8/21/10, Alan Mekler /<amekler@metrocast.net>/* wrote:
>
>
> From: Alan Mekler <amekler@metrocast.net>
> Subject: RV10-List: TMXIO-540 and GAMI injectors
> To: rv10-list@matronics.com
> Date: Saturday, August 21, 2010, 11:04 AM
>
> I have been trying the GAMI injectors( on the 4^th set now) but found
> the fuel flow on the cylinders varies widely. My cylinder #5 has the
> richest injector and it still peaks a gallon or more before the other
> cylinders Before gamis it was 2.5 gallons.. Has any one had this
> problem? Any solutions?
>
> GAMI does not why the fuel is so unbalanced in this engine. I have 95
> hours on the engine and all compressions are good. No intake leaks.
>
> Alan
>
> N668G
>
>
>
> * *
> * *
> **
> **
> **
> *http://www.matronics.com/Navigator?RV10-List*
> **
> **
> *http://forums.matronics.com*
> **
> **
> *http://www.matronics.com/contribution*
> * *
> *
>
>
> *
Message 12
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| Subject: | TMXIO-540 and GAMI injectors |
Patrick,
I agree. I'll be talking to GAMI on Monday.
Alan
-----Original Message-----
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Kelly McMullen
Sent: Saturday, August 21, 2010 8:13 PM
Subject: Re: RV10-List: TMXIO-540 and GAMI injectors
Perhaps you are working on the wrong end of the problem. #3&4 are
peaking last, so must be too rich. The rest of the cylinders are peaking
within 0.4gph of #5. You also will need to gather measurements every 0.2
gph to better detect the peaks once you get those two cylinders closer
to the rest.
On 8/21/2010 3:59 PM, Alan Mekler wrote:
>
> Patrick,
>
> Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l
> than my richest cylinder #3. After changing to GAMIs (my 3^rd set) I'm
> down to a 1 gallon spread. GAMI has given me the richest injector they
> make for cylinder # 5 but it still peaks early.
>
> Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm.
>
> Alan
>
> 13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow gal/hr
>
> 1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1
>
> 1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2
>
> 1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3
>
> 1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4
>
> 1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5
>
> 1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6
>
> other method
>
> cylinder #1 1472 peak @ 11.5
>
> cylinder #2 1451 peak@ 11.2
>
> cylinder #3 1472 peak @ 11.1
>
> cylinder#4 1477 peak @ 11.2
>
> cylinder #5 1473 peak @ 12.1
>
> cylinder #6 1474 peak @ 11.5
>
> ------------------------------------------------------------------------
>
> *From:* owner-rv10-list-server@matronics.com
> [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Patrick
> Thyssen
> *Sent:* Saturday, August 21, 2010 5:22 PM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: TMXIO-540 and GAMI injectors
>
> ? Have you done the coke bottle check? Has anyone messed with the
> lines from the spider to injectors? Are we sure the lines are the
> right ones? The other thing have you had any problems with your EGT
> system. Could your EGT probes be bad?
> Peaking or not peaking where they should?
> Just a few thoughts
> Patrick Thyssen
>
> --- On *Sat, 8/21/10, Alan Mekler /<amekler@metrocast.net>/* wrote:
>
>
> From: Alan Mekler <amekler@metrocast.net>
> Subject: RV10-List: TMXIO-540 and GAMI injectors
> To: rv10-list@matronics.com
> Date: Saturday, August 21, 2010, 11:04 AM
>
> I have been trying the GAMI injectors( on the 4^th set now) but found
> the fuel flow on the cylinders varies widely. My cylinder #5 has the
> richest injector and it still peaks a gallon or more before the other
> cylinders Before gamis it was 2.5 gallons.. Has any one had this
> problem? Any solutions?
>
> GAMI does not why the fuel is so unbalanced in this engine. I have 95
> hours on the engine and all compressions are good. No intake leaks.
>
> Alan
>
> N668G
>
>
>
> * *
> * *
> **
> **
> **
> *http://www.matronics.com/Navigator?RV10-List*
> **
> **
> *http://forums.matronics.com*
> **
> **
> *http://www.matronics.com/contribution*
> * *
> *
>
>
> *
Message 13
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| Subject: | Re: Fuel Flow Transducer Relocation |
Robin,
I'm curious to know which brand of boost pump do you have?
I'm also curious to know if anyone else is seeing this problem using the
Andair boost pump with the FF transducer in Van's stock position.
Thanks,
Phil
On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks <Robin@painttheweb.com> wrote
:
> Since new my Fuel Flow readings varied widely during flight with the
> transducer living in the recommended and what should be it=92s ideal loca
tion
> in the tunnel we decided to take action. I would experience well over 1 G
PH
> swings in the readings with a lot of bouncing in the FF Rate. When I turn
ed
> on the boost pump I would get reading up to 2.5 GPH more than actual fuel
> burn. This made injector tuning nearly impossible even when reviewing EFI
S
> data. The erratic and inaccurate FF figures aversively effected my EFIS f
uel
> totalize always indicating more fuel burned than was actually the case. T
he
> fuel pressure readings tended to bounce around too causing low fuel press
ure
> warnings especially on climb out.
>
> As others have suggested & done in the past we took the drastic step of
> relocating the FF Transducer from the tunnel to forward of the injector
> throttle body between the throttle body and the spider. This modification
> while time consuming did correct the fuel flow issue both in standard fli
ght
> and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs
.
> wild swings of well over 1 GPH.
>
>
> Robin
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 14
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| Subject: | Fuel Flow Transducer Relocation |
Andair boost for me. Fuel flow is a grey metal unit. I think most people
have a red cube? Or am I confusing that with a fuel pressure device.
BTW I didn=92t go into too much detail because we changed a bunch of things
this time around. New fuel lines, replaced some tubing, removed the Andair
gascolator from the system.
Robin
Do Not Archive
*From:* owner-rv10-list-server@matronics.com [mailto:
owner-rv10-list-server@matronics.com] *On Behalf Of *Phillip Perry
*Sent:* Saturday, August 21, 2010 6:50 PM
*To:* rv10-list@matronics.com
*Subject:* Re: RV10-List: Fuel Flow Transducer Relocation
Robin,
I'm curious to know which brand of boost pump do you have?
I'm also curious to know if anyone else is seeing this problem using the
Andair boost pump with the FF transducer in Van's stock position.
Thanks,
Phil
On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks <Robin@painttheweb.com>
wrote:
Since new my Fuel Flow readings varied widely during flight with the
transducer living in the recommended and what should be it=92s ideal locati
on
in the tunnel we decided to take action. I would experience well over 1 GPH
swings in the readings with a lot of bouncing in the FF Rate. When I turned
on the boost pump I would get reading up to 2.5 GPH more than actual fuel
burn. This made injector tuning nearly impossible even when reviewing EFIS
data. The erratic and inaccurate FF figures aversively effected my EFIS fue
l
totalize always indicating more fuel burned than was actually the case. The
fuel pressure readings tended to bounce around too causing low fuel pressur
e
warnings especially on climb out.
As others have suggested & done in the past we took the drastic step of
relocating the FF Transducer from the tunnel to forward of the injector
throttle body between the throttle body and the spider. This modification
while time consuming did correct the fuel flow issue both in standard fligh
t
and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs.
wild swings of well over 1 GPH.
Robin
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Message 15
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| Subject: | Re: Fuel Flow Transducer Relocation |
The two most common flow transducers are EI's red cube and FloScan's grey
metal unit.
We moved our red cube some time ago and the difference was just like Robin
saw. We have the stock pump. My understanding is that pulses from the fue
l
pump confuse the transducer. Whatever the cause it seems to be pretty
universal.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Sat, Aug 21, 2010 at 9:10 PM, Robin Marks <Robin@painttheweb.com> wrote:
> Andair boost for me. Fuel flow is a grey metal unit. I think most people
> have a red cube? Or am I confusing that with a fuel pressure device.
>
>
> BTW I didn=99t go into too much detail because we changed a bunch o
f things
> this time around. New fuel lines, replaced some tubing, removed the Andai
r
> gascolator from the system.
>
>
> Robin
>
> Do Not Archive
>
>
> *From:* owner-rv10-list-server@matronics.com [mailto:
> owner-rv10-list-server@matronics.com] *On Behalf Of *Phillip Perry
> *Sent:* Saturday, August 21, 2010 6:50 PM
> *To:* rv10-list@matronics.com
> *Subject:* Re: RV10-List: Fuel Flow Transducer Relocation
>
>
> Robin,
>
> I'm curious to know which brand of boost pump do you have?
>
> I'm also curious to know if anyone else is seeing this problem using the
> Andair boost pump with the FF transducer in Van's stock position.
>
> Thanks,
> Phil
>
>
> On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks <Robin@painttheweb.com>
> wrote:
>
> Since new my Fuel Flow readings varied widely during flight with the
> transducer living in the recommended and what should be it=99s idea
l location
> in the tunnel we decided to take action. I would experience well over 1 G
PH
> swings in the readings with a lot of bouncing in the FF Rate. When I turn
ed
> on the boost pump I would get reading up to 2.5 GPH more than actual fuel
> burn. This made injector tuning nearly impossible even when reviewing EFI
S
> data. The erratic and inaccurate FF figures aversively effected my EFIS f
uel
> totalize always indicating more fuel burned than was actually the case. T
he
> fuel pressure readings tended to bounce around too causing low fuel press
ure
> warnings especially on climb out.
>
> As others have suggested & done in the past we took the drastic step of
> relocating the FF Transducer from the tunnel to forward of the injector
> throttle body between the throttle body and the spider. This modification
> while time consuming did correct the fuel flow issue both in standard fli
ght
> and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs
.
> wild swings of well over 1 GPH.
>
>
> Robin
>
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RV1*
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Message 16
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| Subject: | Miniumum fuel comfort zone |
In re-analyzing my numbers from my trip to OSH - felt that it is best to be on
the ground when you have less than 7 gallons in each tank. I have very accurate
readings from my tank floats and fuel scan is right on the money. Since a big
percentage of accidents are from just running out of gas, I'd like any input
on minimum usable fuel in the std tanks so that we can all keep a comfortable
safety zone.
I also need this info as I fit out my 90 gallon internal tank for the round-the-poles
flight - ok just kidding.......
--------
OSH '10 or Bust
Q/B - finally done
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309710#309710
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