Today's Message Index:
----------------------
1. 05:20 AM - Re: Air filters - Carb Ice - 912 (Lowell Fitt)
2. 06:12 AM - Re: Air filters - Carb Ice - 912 (michel)
3. 06:17 AM - Re: Air filters - Carb Ice - 912 (Steve Magdic)
4. 06:28 AM - Re: 912S - Powerfin Prop Now what? (JMCBEAN)
5. 07:37 AM - Re: Air filters - Carb Ice - 912 (kerrjohna@comcast.net)
6. 08:58 AM - Re: Air filters - Carb Ice - 912 (Randy Daughenbaugh)
7. 08:58 AM - Re: Air filters - Carb Ice - 912 (Randy Daughenbaugh)
8. 09:08 AM - Re: Air filters - Carb Ice - 912 (flier)
9. 10:32 AM - Re: Air filters - Carb Ice - 912 (John E. King)
10. 05:15 PM - Re: Air filters - Carb Ice - 912 (JMCBEAN)
11. 08:01 PM - Re: Air filters - Carb Ice - 912 (Randy Daughenbaugh)
Message 1
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| Subject: | Re: Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "Lowell Fitt" <lcfitt@inreach.com>
Randy,
This has been practice in the Kitfox since I built - 1993 thru 1998. Very
few Kitfox owners I know of have the carb heat box installed. It is
required in Europe, as I understand it, as most government agencies are
tradition driven rather than evidence driven.
I never had the carb heat system installed in my airplane, so don't have
first hand experience with and without, regarding performance, but increased
performance is how I hear it. I can't say regarding the 912S, but suspect
it is the same.
Regards, Lowell
----- Original Message -----
From: "John Anderson" <janderson412@hotmail.com>
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
> --> Kitfox-List message posted by: "John Anderson"
<janderson412@hotmail.com>
>
>
> Randy, with regard to the fresh cold air you mentionthe 7 calls for, how
is this different to a 5 or 6??
>
>
> From: "RandyDaughenbaugh" <RJDAUGH@RAPIDNET.COM>
> To: <KITFOX-LIST@MATRONICS.COM>
> Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
> Date: Thu, 8 Jan 2004 20:36:23 -0700
>
> -- Kitfox-List message posted by: "RandyDaughenbaugh"
<RJDAUGH@RAPIDNET.COM>
>
>
> Lowell,
> Your comment is right on for something that I am wrestling with.I have
> been considering not using the air induction system and going with two
> air filters with warm cowl air rather than the single air filter with
> fresh cold air that the series 7 firewall forward calls for.I felt the
> trade off was better breathing (less air friction) versus lower density
> warm air. But I don't know where the balance is between the two
> effects.
>
> If I read you right, you feel that carb ice is more likely with the carb
> heat system in place than if it is not used.... AND you feel that
> performance is better with two air filters.Is that right?And what do
> your base this on?
>
> My guess from comments on the list here is that most people do not use
> the carb heat system that Rotax supplies for the 912, but does pulling
> cool fresh air like the series 7 firewall forward allows give better
> performance?Is carb ice more likely in the 912S than the 912?
>
> Randy -Mounting 912S on fuselage and anxious to get in the air!!!!
>
> .
>
>
> -----Original Message-----
> From: owner-kitfox-list-server@matronics.com
> [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell Fitt
> To: kitfox-list@matronics.com
> Subject: Re: Kitfox-List: Air filters
>
> -- Kitfox-List message posted by: "Lowell Fitt" <LCFITT@INREACH.COM>
>
> John,Do you have the carb heat system on your airplane?If not you
> are
> the first person I have heard of that had a real carb ice problem.You
> said
> you forgotten the knob.Actually, I have heard of carb icing in the
> Rotax
> 912, but only in aircraft with the carb heat system in place.The
> induction
> air is ducted from the front of the cowl - cold,whereas the air in non
> carb heat installation the air is obtained from the back of the engine
> compartment - warm.The absence of the friction in the system more than
> compensates for the warmer air.
>
> Lowell
> ----- Original Message -----
> From: "John Oakley" <JOAKLEY@IDA.NET>
> To: <KITFOX-LIST@MATRONICS.COM>
> Subject: RE: Kitfox-List: Air filters
>
>
> -- Kitfox-List message posted by: "John Oakley" <JOAKLEY@IDA.NET>
>
> Paul,
> are you sure you want to remove the heat system. I had carb ice this
> year
> for the first time in 1000 kitfox time. scared the hell out of me. I
> had
> forgoten the knob (carb heat) and bairly limped into a field. it was a
> big
> loss in hp and we were headed downhill.
>
> JOhn Oakley
>
>
Message 2
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: michel <michel@online.no>
>===== Original Message From "Lowell Fitt" <lcfitt@inreach.com> =====
>Very few Kitfox owners I know of have the carb heat box installed. It is
>required in Europe, as I understand it, as most government agencies are
>tradition driven rather than evidence driven.
It may be true for Kitfoxes built as Experimental, Lowell, but not as
Microlight. Nor do Microlights need ELT but they need a helmet. And do you
know what it takes to import an American car in e.g. Norway? Lots of
modifications! Yet when the European Union tries to standardize procedures,
people are yelling: " No way! We don'd want stupid rules from Brussels*! We
were much happier before!"
So, it is not only the government agencies but us, liking our "old-fashion"
way of doing things.
Cheers,
Michel
* Brussels is the HQ of the European Union. My place of birth is unfortunately
often used as an insult for everything that goes wrong in Europe :-(
do not archive
Message 3
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "Steve Magdic" <steve.magdic@1psg.com>
Gentlemen, I have carb heat installed on my 912 and have had to use it a few times.
It may just be the way the intake/air filter is mounted but I definitely need it
when the temp/dew point are within a couple degrees. I notice a slight decrease
in
horse power but much better EGT and oil temps when using it.
I have several pics I would be willing to pass along to anyone that's interested.
Steve Magdic
Mod 3/4 Wing
-----Original Message-----
From: Lowell Fitt [mailto:lcfitt@inreach.com]
Subject: Re: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "Lowell Fitt" <lcfitt@inreach.com>
Randy,
This has been practice in the Kitfox since I built - 1993 thru 1998. Very
few Kitfox owners I know of have the carb heat box installed. It is
required in Europe, as I understand it, as most government agencies are
tradition driven rather than evidence driven.
I never had the carb heat system installed in my airplane, so don't have
first hand experience with and without, regarding performance, but increased
performance is how I hear it. I can't say regarding the 912S, but suspect
it is the same.
Regards, Lowell
----- Original Message -----
From: "John Anderson" <janderson412@hotmail.com>
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
> --> Kitfox-List message posted by: "John Anderson"
<janderson412@hotmail.com>
>
>
> Randy, with regard to the fresh cold air you mentionthe 7 calls for, how
is this different to a 5 or 6??
>
>
> From: "RandyDaughenbaugh" <RJDAUGH@RAPIDNET.COM>
> To: <KITFOX-LIST@MATRONICS.COM>
> Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
> Date: Thu, 8 Jan 2004 20:36:23 -0700
>
> -- Kitfox-List message posted by: "RandyDaughenbaugh"
<RJDAUGH@RAPIDNET.COM>
>
>
> Lowell,
> Your comment is right on for something that I am wrestling with.I have
> been considering not using the air induction system and going with two
> air filters with warm cowl air rather than the single air filter with
> fresh cold air that the series 7 firewall forward calls for.I felt the
> trade off was better breathing (less air friction) versus lower density
> warm air. But I don't know where the balance is between the two
> effects.
>
> If I read you right, you feel that carb ice is more likely with the carb
> heat system in place than if it is not used.... AND you feel that
> performance is better with two air filters.Is that right?And what do
> your base this on?
>
> My guess from comments on the list here is that most people do not use
> the carb heat system that Rotax supplies for the 912, but does pulling
> cool fresh air like the series 7 firewall forward allows give better
> performance?Is carb ice more likely in the 912S than the 912?
>
> Randy -Mounting 912S on fuselage and anxious to get in the air!!!!
>
> .
>
>
> -----Original Message-----
> From: owner-kitfox-list-server@matronics.com
> [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell Fitt
> To: kitfox-list@matronics.com
> Subject: Re: Kitfox-List: Air filters
>
> -- Kitfox-List message posted by: "Lowell Fitt" <LCFITT@INREACH.COM>
>
> John,Do you have the carb heat system on your airplane?If not you
> are
> the first person I have heard of that had a real carb ice problem.You
> said
> you forgotten the knob.Actually, I have heard of carb icing in the
> Rotax
> 912, but only in aircraft with the carb heat system in place.The
> induction
> air is ducted from the front of the cowl - cold,whereas the air in non
> carb heat installation the air is obtained from the back of the engine
> compartment - warm.The absence of the friction in the system more than
> compensates for the warmer air.
>
> Lowell
> ----- Original Message -----
> From: "John Oakley" <JOAKLEY@IDA.NET>
> To: <KITFOX-LIST@MATRONICS.COM>
> Subject: RE: Kitfox-List: Air filters
>
>
> -- Kitfox-List message posted by: "John Oakley" <JOAKLEY@IDA.NET>
>
> Paul,
> are you sure you want to remove the heat system. I had carb ice this
> year
> for the first time in 1000 kitfox time. scared the hell out of me. I
> had
> forgoten the knob (carb heat) and bairly limped into a field. it was a
> big
> loss in hp and we were headed downhill.
>
> JOhn Oakley
>
>
Message 4
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| Subject: | 912S - Powerfin Prop Now what? |
--> Kitfox-List message posted by: "JMCBEAN" <JDMCBEAN@cableone.net>
Randy,
Looks like you got most the answers you needed... You may want to contact
Dave Morris he should be able to send you some instructions that were done
regarding the prop extension and the Warp Drive Prop. I believe the
Powerfin and the Warp install the same way.
Blue Skies!!
John & Debra McBean
"The Sky is not the Limit... It's a Playground"
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com]On Behalf Of Randy
Daughenbaugh
Subject: RE: Kitfox-List: 912S - Powerfin Prop Now what?
--> Kitfox-List message posted by: "Randy Daughenbaugh"
<rjdaugh@rapidnet.com>
Bob,
This really helps! And the education on the strength/brittleness is
appreciated as well.
As an additional issue, I think I also need bushings/dowels/lugs that
serve the same function between the prop extention and the prop hub.
These need to be between 25 and 30 mm long. Are these available some
place?
Thanks again,
Randy
.
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Bob
Robertson
Subject: Re: Kitfox-List: 912S - Powerfin Prop Now what?
--> Kitfox-List message posted by: "Bob Robertson"
<aerocon1@telusplanet.net>
Randy...
Wadda you mean "not smart enough"!!!! You already figured out that the
8mm
bolts won't work in a 13mm hole. ;
)
Actually, there are some "spigot" nuts (shouldered nuts) that press into
the
13mm holes and have an 8mm thread.
These nuts will protrude through the front of the prop flange and also
act
as dowels. Your prop should have come with a hub that is drilled to
accept
these dowels. If you are using a 2" prop extension you will need to
have
the extension drilled to accept the dowels.
Any of the Rotax Service Centers can supply you with the nuts. You will
have to replace the bolts you recieved with the Powerfin. Make sure
the new bolts are also 8mm 8.8... (Don't get any of the high strength
metric
bolts as they are too brittle and can (will) fracture.
Hope this helps
Bob Robertson
Light Engine Services Ltd.
Rotax Service Center
St. Albert, Ab. Can
----- Original Message -----
From: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
Subject: Kitfox-List: 912S - Powerfin Prop Now what?
> --> Kitfox-List message posted by: "Randy Daughenbaugh"
<rjdaugh@rapidnet.com>
>
> I have a 912S and a nice Powerfin prop that I am not smart enough to
> hook together.
>
> The mounting bolts that come with the prop have Allen heads that fit
> through the mounting holes on the engine. 13 mm holes and heads same
> with a little clearance??
>
> I suspect that I need something like bushings to take the slack out
> between the 8 mm bolt and the 13 mm holes and then a larger washer
that
> captures the bushing and won't go through the hole. Again ???? It
> seems like they should have come with the prop or engine or the
> extension. ???
>
> I also have a 2" prop extension with the same issues, but once I solve
> one the other should be identical with 2" longer bolts.
>
> Am I on the right track? Who has these parts? Skystar? Powerfin?
> Rotax?
>
> Thanks for eliminating my ignorance in this area.
>
> Randy - Series 5/7 - It's the little things.......
>
>
==
==
==
==
Message 5
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: kerrjohna@comcast.net
I'll give a report on my experience as well. Replaced the Carb/air system with
the less expensive 2x2.5 air filters resulted in no measurable difference on climb
out (the test attitude).
Then installed the 5.5 in offset air filters and experienced 2-300 increase in
rpm and needed to increase pitch on prop to accommodate the extra power.
Anecdotal, but I won't go back.
John Kerr
4350'msl
> --> Kitfox-List message posted by: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
>
>
> Lowell,
> Your comment is right on for something that I am wrestling with. I have
> been considering not using the air induction system and going with two
> air filters with warm cowl air rather than the single air filter with
> fresh cold air that the series 7 firewall forward calls for. I felt the
> trade off was better breathing (less air friction) versus lower density
> warm air. But I don't know where the balance is between the two
> effects.
>
> If I read you right, you feel that carb ice is more likely with the carb
> heat system in place than if it is not used.... AND you feel that
> performance is better with two air filters. Is that right? And what do
> your base this on?
>
> My guess from comments on the list here is that most people do not use
> the carb heat system that Rotax supplies for the 912, but does pulling
> cool fresh air like the series 7 firewall forward allows give better
> performance? Is carb ice more likely in the 912S than the 912?
>
> Randy - Mounting 912S on fuselage and anxious to get in the air!!!!
>
> .
>
>
> -----Original Message-----
> From: owner-kitfox-list-server@matronics.com
> [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell Fitt
> To: kitfox-list@matronics.com
> Subject: Re: Kitfox-List: Air filters
>
> --> Kitfox-List message posted by: "Lowell Fitt" <lcfitt@inreach.com>
>
> John, Do you have the carb heat system on your airplane? If not you
> are
> the first person I have heard of that had a real carb ice problem. You
> said
> you forgotten the knob. Actually, I have heard of carb icing in the
> Rotax
> 912, but only in aircraft with the carb heat system in place. The
> induction
> air is ducted from the front of the cowl - cold, whereas the air in non
> carb heat installation the air is obtained from the back of the engine
> compartment - warm. The absence of the friction in the system more than
> compensates for the warmer air.
>
> Lowell
> ----- Original Message -----
> From: "John Oakley" <joakley@ida.net>
> To: <kitfox-list@matronics.com>
> Subject: RE: Kitfox-List: Air filters
>
>
> > --> Kitfox-List message posted by: "John Oakley" <joakley@ida.net>
> >
> > Paul,
> > are you sure you want to remove the heat system. I had carb ice this
> year
> > for the first time in 1000 kitfox time. scared the hell out of me. I
> had
> > forgoten the knob (carb heat) and bairly limped into a field. it was a
> big
> > loss in hp and we were headed downhill.
> >
> > JOhn Oakley
> >
>
>
>
>
>
>
Message 6
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
John,
Thanks much for the info.
Thanks also to Lowell Fit! This list is a tremendous resource! It is
important to remember that it is the contributions of knowledgeable
individuals with pertinent experience that makes it great!
Thanks,
Randy - "Centrally isolated" in the Black Hills of South Dakota but in
touch with the list!
.
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of
kerrjohna@comcast.net
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: kerrjohna@comcast.net
I'll give a report on my experience as well. Replaced the Carb/air
system with the less expensive 2x2.5 air filters resulted in no
measurable difference on climb out (the test attitude).
Then installed the 5.5 in offset air filters and experienced 2-300
increase in rpm and needed to increase pitch on prop to accommodate the
extra power.
Anecdotal, but I won't go back.
John Kerr
4350'msl
> --> Kitfox-List message posted by: "Randy Daughenbaugh"
<rjdaugh@rapidnet.com>
>
>
> Lowell,
> Your comment is right on for something that I am wrestling with. I
have
> been considering not using the air induction system and going with two
> air filters with warm cowl air rather than the single air filter with
> fresh cold air that the series 7 firewall forward calls for. I felt
the
> trade off was better breathing (less air friction) versus lower
density
> warm air. But I don't know where the balance is between the two
> effects.
>
> If I read you right, you feel that carb ice is more likely with the
carb
> heat system in place than if it is not used.... AND you feel that
> performance is better with two air filters. Is that right? And what
do
> your base this on?
>
> My guess from comments on the list here is that most people do not use
> the carb heat system that Rotax supplies for the 912, but does pulling
> cool fresh air like the series 7 firewall forward allows give better
> performance? Is carb ice more likely in the 912S than the 912?
>
> Randy - Mounting 912S on fuselage and anxious to get in the air!!!!
>
> .
>
>
> -----Original Message-----
> From: owner-kitfox-list-server@matronics.com
> [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell
Fitt
> To: kitfox-list@matronics.com
> Subject: Re: Kitfox-List: Air filters
>
> --> Kitfox-List message posted by: "Lowell Fitt" <lcfitt@inreach.com>
>
> John, Do you have the carb heat system on your airplane? If not you
> are
> the first person I have heard of that had a real carb ice problem.
You
> said
> you forgotten the knob. Actually, I have heard of carb icing in the
> Rotax
> 912, but only in aircraft with the carb heat system in place. The
> induction
> air is ducted from the front of the cowl - cold, whereas the air in
non
> carb heat installation the air is obtained from the back of the engine
> compartment - warm. The absence of the friction in the system more
than
> compensates for the warmer air.
>
> Lowell
> ----- Original Message -----
> From: "John Oakley" <joakley@ida.net>
> To: <kitfox-list@matronics.com>
> Subject: RE: Kitfox-List: Air filters
>
>
> > --> Kitfox-List message posted by: "John Oakley" <joakley@ida.net>
> >
> > Paul,
> > are you sure you want to remove the heat system. I had carb ice this
> year
> > for the first time in 1000 kitfox time. scared the hell out of me. I
> had
> > forgoten the knob (carb heat) and bairly limped into a field. it was
a
> big
> > loss in hp and we were headed downhill.
> >
> > JOhn Oakley
> >
>
>
>
>
>
>
==
==
==
==
Message 7
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
John,
As I have seen only a couple of examples, I may easily be wrong in my
assumption on how the 5 or 6 is set up. I have tried to research this
but the only instructions on the Skystar web site is for the 7 firewall
forward.
http://www.skystar.com/PDF%20Files/64913-000.pdf
If you look here you can see the setup calls for the fresh air pickup to
be in a NACA duct ahead of the radiator.
I suspect that you are right! - there may not be a significant
functional difference.
Randy
.
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of John
Anderson
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "John Anderson"
<janderson412@hotmail.com>
Randy, with regard to the fresh cold air you mentionthe 7 calls for, how
is this different to a 5 or 6??
Message 8
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| Subject: | Air filters - Carb Ice - 912 |
I didn't get that kind of RPM increase but I could
tell the difference as well going to the larger
pancake K&Ns...
--> Kitfox-List message posted by: "flier" <FLIER@sbcglobal.net>
Regards,
Ted
--- Original Message ---
From: kerrjohna@comcast.net
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
>--> Kitfox-List message posted by:
kerrjohna@comcast.net
>
>I'll give a report on my experience as well.
Replaced the Carb/air system with the less expensive
2x2.5 air filters resulted in no measurable
difference on climb out (the test attitude).
>
>Then installed the 5.5 in offset air filters and
experienced 2-300 increase in rpm and needed to
increase pitch on prop to accommodate the extra power.
>
>Anecdotal, but I won't go back.
>
>John Kerr
>4350'msl
Message 9
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| Subject: | Re: Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "John E. King " <kingjohn@erols.com>
Randy & John,
I am very familiar with the Series 6 cowling configuration, but have
only looked at the Series 7. The Series 6 has only two air intake holes
in the front of the cowl. The Series 7 has the two holes, as well as,
the NACA duct on the bottom. The Series 7 two holes are much smaller
than those of the Series 6 since its cowling is much narrower at the
front end. I think this was one of the ways they reduced drag to
increase air speed in the Series 7. It is my guess that the NACA duct
is required to allow more air to the Series 7 radiator.
--
John King
Warrenton, VA
Randy Daughenbaugh wrote:
>--> Kitfox-List message posted by: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
>
>John,
>As I have seen only a couple of examples, I may easily be wrong in my
>assumption on how the 5 or 6 is set up. I have tried to research this
>but the only instructions on the Skystar web site is for the 7 firewall
>forward.
>
>http://www.skystar.com/PDF%20Files/64913-000.pdf
>
>If you look here you can see the setup calls for the fresh air pickup to
>be in a NACA duct ahead of the radiator.
>
>I suspect that you are right! - there may not be a significant
>functional difference.
>
>Randy
>
>
>
>
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John King
Warrenton, VA
Message 10
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "JMCBEAN" <JDMCBEAN@cableone.net>
Randy,
Maybe this will help.... The earlier Kitfox's, pre Series 7, had filters
on the intake of the carbs.... Unless the optional carb heat box was
installed. Then both carbs were tied to the carb heat box and the filter was
on the intake of the box. I do not believe that many carb heat boxes were
installed and all that I have spoke with that used them said when removed
saw a increase in performance.
The Series 7 is a horse of a different color. For the first time the Kitfox
is utilizing the Rotax induction plenum. The plenum ties both carbs
together and has two ports on it. One port is for fresh air. The Series 7
install has you route a Scat tube from the port down to the NACA scoop in
the cowling and into a filter that has been mounted outside the cowling in
the NACA. The other port is designed for carb heat. SS does not currently
have a kit to utilize this feature. It is designed to use a pull cable to
flip a butterfly shutting down the fresh air and opening the heat. One
could very easily adapt it.
On my aircraft, I chose to install the air filter directly to the induction
plenum and not run the Scat tubing. With the filter inside the cowling I
have not noticed a decrease in performance. I also safety wired the
butterfly so that it could not shut the filtered air off. The Series 7
install is much different then the Series 6.
Hope this helps some.
Blue Skies!!
John & Debra McBean
"The Sky is not the Limit... It's a Playground"
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com]On Behalf Of Randy
Daughenbaugh
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "Randy Daughenbaugh"
<rjdaugh@rapidnet.com>
John,
As I have seen only a couple of examples, I may easily be wrong in my
assumption on how the 5 or 6 is set up. I have tried to research this
but the only instructions on the Skystar web site is for the 7 firewall
forward.
http://www.skystar.com/PDF%20Files/64913-000.pdf
If you look here you can see the setup calls for the fresh air pickup to
be in a NACA duct ahead of the radiator.
I suspect that you are right! - there may not be a significant
functional difference.
Randy
.
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of John
Anderson
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "John Anderson"
<janderson412@hotmail.com>
Randy, with regard to the fresh cold air you mentionthe 7 calls for, how
is this different to a 5 or 6??
Message 11
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| Subject: | Air filters - Carb Ice - 912 |
--> Kitfox-List message posted by: "Randy Daughenbaugh" <rjdaugh@rapidnet.com>
John,
Thanks for your comments. I appreciate your time!
The induction plenum is a thing of beauty! For those interested, it can
be seen at
http://www.kodiakbs.com/4intro.htm
I don't understand the advantage of it though other than a place to hook
an intake manifold gage to. The way you have set it up wouldn't it
breath better if you just put an air filter on each carb?
I have contemplated taking the nice interlinked butterfly valves out and
put an airfilter on each intake port to improve the breathing. There
are some internals inside the plenum that would appear to restrict the
air flow to the left carbs. Maybe this is the purpose..???? Are there
some advantages the way the carbs are vented?
I can see that it would reduce intake noise.
I have been trying to find a discussion of its function on a rotax
website.
Randy
.
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of JMCBEAN
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "JMCBEAN" <JDMCBEAN@cableone.net>
Randy,
Maybe this will help.... The earlier Kitfox's, pre Series 7,
had filters
on the intake of the carbs.... Unless the optional carb heat box was
installed. Then both carbs were tied to the carb heat box and the filter
was
on the intake of the box. I do not believe that many carb heat boxes
were
installed and all that I have spoke with that used them said when
removed
saw a increase in performance.
The Series 7 is a horse of a different color. For the first time the
Kitfox
is utilizing the Rotax induction plenum. The plenum ties both carbs
together and has two ports on it. One port is for fresh air. The Series
7
install has you route a Scat tube from the port down to the NACA scoop
in
the cowling and into a filter that has been mounted outside the cowling
in
the NACA. The other port is designed for carb heat. SS does not
currently
have a kit to utilize this feature. It is designed to use a pull cable
to
flip a butterfly shutting down the fresh air and opening the heat. One
could very easily adapt it.
On my aircraft, I chose to install the air filter directly to the
induction
plenum and not run the Scat tubing. With the filter inside the cowling
I
have not noticed a decrease in performance. I also safety wired the
butterfly so that it could not shut the filtered air off. The Series 7
install is much different then the Series 6.
Hope this helps some.
Blue Skies!!
John & Debra McBean
"The Sky is not the Limit... It's a Playground"
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com]On Behalf Of Randy
Daughenbaugh
Subject: RE: Kitfox-List: Air filters - Carb Ice - 912
--> Kitfox-List message posted by: "Randy Daughenbaugh"
<rjdaugh@rapidnet.com>
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