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Exhaust clearances

 
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rvdave



Joined: 24 Jan 2009
Posts: 191

PostPosted: Thu Oct 16, 2014 4:06 am    Post subject: Exhaust clearances Reply with quote

Am installing Vetterman exhaust and wondering about clearances to cowling. Vans plans show 5/8 min to firewall but don't see anything about cowl clearances. From your experiences of tailpipe/heat/cowl relationship do I need to cut back lower cowl any more? It's currently parallel to firewall at bottom cut edge.
Thanks

https://www.dropbox.com/m/browse?path=%2FExhaust


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Dave Ford
Cadillac, MI
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jesse(at)saintaviation.co
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PostPosted: Thu Oct 16, 2014 4:42 am    Post subject: Exhaust clearances Reply with quote

You shouldn't have to cut it back. The exhaust does come very close to the cowl around the heat muffs and where it exits. I recommend a heat shield on the cowl where the exhaust is close.

Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com

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Quote:
On Oct 16, 2014, at 6:06 AM, "rvdave" <rv610dave(at)gmail.com> wrote:



Am installing Vetterman exhaust and wondering about clearances to cowling. Vans plans show 5/8 min to firewall but don't see anything about cowl clearances. From your experiences of tailpipe/heat/cowl relationship do I need to cut back lower cowl any more? It's currently parallel to firewall at bottom cut edge.
Thanks

https://www.dropbox.com/m/browse?path=%2FExhaust

--------
Dave Ford
RV6 flying
RV10 building
Cadillac, MI




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=431935#431935












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rvdave



Joined: 24 Jan 2009
Posts: 191

PostPosted: Thu Oct 16, 2014 7:29 am    Post subject: Re: Exhaust clearances Reply with quote

Great, I can use the stick on foil for shielding. Got me thinking though about exit air, if that is adequate exit area? Don't want to use louvres unless I have to.

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Dave Ford
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jchang10



Joined: 05 Jul 2006
Posts: 227

PostPosted: Thu Oct 16, 2014 7:53 am    Post subject: Exhaust clearances Reply with quote

Personally, my lower cowl in this area has never shown any signs of
excessive heat. Thus, not sure i would bother with shielding. The primer
i used did peel up a bit when i did a regular cleanup with simple green.
I think the exhaust gases sort of shoot straight out of the pipe and
never build up much heat in this area. My heat muff does have some burnt
oil on it but the cowl underneath has never shown any signs of heat either.

My cowl showed signs of heat more around the front 4 cyls 1,2,3,4.
Namely, the point where the 3 pipes converge into 1, and where the pipes
take a big bend. I think there is a 180deg bend in one of the pipes at
least. I plan to put a heat shield on the pipes, which i think looks
cleaner than foil shielding on the cowl itself.

My 2c worth.
Jae

On 10/16/2014 8:29 AM, rvdave wrote:
Quote:


Great, I can use the stick on foil for shielding. Got me thinking though about exit air, if that is adequate exit area?

--------
Dave Ford
RV6 flying
RV10 building
Cadillac, MI


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=431946#431946




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#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011
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partner14



Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

PostPosted: Thu Oct 16, 2014 7:55 am    Post subject: Exhaust clearances Reply with quote

If you don't have cold air induction and/or higher compression, you should be fine.
Don McDonald
From: rvdave <rv610dave(at)gmail.com>
To: rv10-list(at)matronics.com
Sent: Thursday, October 16, 2014 10:29 AM
Subject: Re: Exhaust clearances


--> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>

Great, I can use the stick on foil for shielding. Got me thinking though about exit air, if that is adequate exit area?

--------
Dave Ford
RV6 flying
RV10 building
Cadillac, MI


Read this topic online here:


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Don A. McDonald
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partner14



Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

PostPosted: Thu Oct 16, 2014 8:25 am    Post subject: Exhaust clearances Reply with quote

Just remember, just as a cars engine compartment is never as hot when running down the road as it is when you stop, and shut the engine off.... the plane is the same way. Just reach inside with a pencil and mark where the bottom cowl gets close to the any of the exhaust headers, then install some 2,000 degree race reflective tape.... the "better to be safe than sorry" expression applies here.
Even though I have cold air induction and higher compression, so parts of the bottom cowl are different, you should still end up with temp tape looking something like the attached pic.

Don McDonald

BTW. replacing the remaining 2 cables (throttle and mixture).... Van's original cables lasted 5+ years and almost 700 hours.... replaced with cables from California Push Pull in Chico Calif.... nice guys, and they're supposed to handle the heat a little better. http://www.push-pull.com/

From: Jae Chang <jc-matronics_rv10(at)jline.com> To: rv10-list(at)matronics.com Sent: Thursday, October 16, 2014 10:53 AM Subject: Re: Re: Exhaust clearances
--> RV10-List message posted by: Jae Chang <jc-matronics_rv10(at)jline.com (jc-matronics_rv10(at)jline.com)>Personally, my lower cowl in this area has never shown any signs of excessive heat. Thus, not sure i would bother with shielding. The primer i used did peel up a bit when i did a regular cleanup with simple green. I think the exhaust gases sort of shoot straight out of the pipe and never build up much heat in this area. My heat muff does have some burnt oil on it but the cowl underneath has never shown any signs of heat either.My cowl showed signs of heat more around the front 4 cyls 1,2,3,4. Namely, the point where the 3 pipes converge into 1, and where the pipes take a big bend. I think there is a 180deg bend in one of the pipes at least. I plan to put a heat shield on the pipes, which i think looks cleaner than foil shielding on the cowl itself.My 2c worth.JaeOn 10/16/2014 8:29 AM, rvdave wrote:> --> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>>> Great, I can use the stick on foil for shielding. Got me thinking though about exit air, if that is adequate exit area?>> --------> Dave Ford> RV6 flying> RV10 building> Cadillac, MI>>>>> Read this topic online here:>> <a style="" class="" href="http://forums.matronics.com/viewtopic.php?p=431946#431946"


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