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ddddsp1(at)juno.com
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 Posted: Tue Aug 01, 2006 11:49 am Post subject: Altering the Exhaust? |
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As I read some of these post on the exhaust and how builders are going to ALTER the pipes, bend them, cut them, etc. You may want to give Larry Vetterman a call before you do that and insure you are NOT changing the performance/porting when you make those changes. With a tuned exhaust system you may be creating additional problems trying to correct one. I am NOT saying your changes WILL effect the engine performance, but I would talk to the exhaust PRO before I modified his proven system.
FWIW,
Dean
40449
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Tim(at)MyRV10.com
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| Posted: Tue Aug 01, 2006 12:37 pm Post subject: Altering the Exhaust? |
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I had been told at OSH by people that it probably wouldn't make
a difference. But, your post got me motivated, so I talked
to the PRO himself just now on the phone. He says he doesn't
think it would make any difference and says it could probably
be lengthened or changed up to a foot with no performance
penalty. So, he's making me up a set of 6" extensions I can
try so I can see if it helps or changes anything at all. If
by some chance they change heat or noise significantly, I'll
probably see if I can buy a longer set of pipes. He did say
though that other than one builder, he hasn't had anyone
really complain that there's a heat problem.
Tim Olson - RV-10 N104CD - Flying
do not archive
ddddsp1(at)juno.com wrote:
| Quote: | As I read some of these post on the exhaust and how builders are going
to ALTER the pipes, bend them, cut them, etc. You may want to give
Larry Vetterman a call before you do that and insure you are NOT
changing the performance/porting when you make those changes. With a
tuned exhaust system you may be creating additional problems trying to
correct one. I am NOT saying your changes WILL effect the engine
performance, but I would talk to the exhaust PRO before I modified his
proven system.
FWIW,
Dean
40449
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rvbuilder(at)sausen.net
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| Posted: Tue Aug 01, 2006 1:34 pm Post subject: Altering the Exhaust? |
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With my exhaust system I am not modifying0 anything. It is being built by John Forsling who goes way back with0 Vetterman. John has done a lot of work with exhaust systems over the0 years, including running different exhaust styles on dynos, and is one of0 the experts. One of the things that were discovered in dyno tests is0 that tuning doesn't make a difference on most of these engines including ours0 which echo's what Tim said.
Michael
From: owner-rv10-list-server(at)matronics.com0 [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of0 ddddsp1(at)juno.com
Sent: Tuesday, August 01, 2006 2:460 PM
To: rv10-list(at)matronics.com
Subject: RE:0 Altering the Exhaust?
As I read some of these post on the exhaust and how builders are going to0 ALTER the pipes, bend them, cut them, etc. You may want to give Larry0 Vetterman a call before you do that and insure you are NOT changing the0 performance/porting when you make those changes. With a tuned exhaust0 system you may be creating additional problems trying to correct one. I am0 NOT saying your changes WILL effect the engine performance, but I would talk to0 the exhaust PRO before I modified his proven system.
FWIW,
Dean
40449
________________________________________________________________________
Try0 Juno Platinum for Free! Then, only $9.95/month!
Visit http://www.juno.com/value to sign up0 today!
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ddddsp1(at)juno.com
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| Posted: Tue Aug 01, 2006 1:54 pm Post subject: Altering the Exhaust? |
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Tim,
That will be a good test on your plane since you already have several hours of data to compare it too. Did you ask Larry about putting any bends or curves in the pipe? Just adding length probably would not increase exhaust back pressure much but I would think if people got carried away with putting major bends in the pipes it would change the dynamics. HOWEVER, as the builder we can do whatever we want.........build on.
Dean 40449
P.S. Engine inspector called today.......he was impressed how clean and well preserved the O-540 was and said it should be ready to mount on the plane by the 12th of Aug! I will sleep easier hearing that.
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Tim(at)MyRV10.com
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| Posted: Tue Aug 01, 2006 6:56 pm Post subject: Altering the Exhaust? |
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Dean,
I didn't ask about any bends or curves, but the bends Michael was
talking about are barely bends at all, just a slight downturn
at the end. I really doubt that anyone would be able to get
too wild with the little ends of the exhaust in a way that would
cause big problems. My goal is to see if these extensions,
that should add about 3" of length, actually do anything. I'll
treat them as temporary. If they do anything amazing, I know I
can buy totally new, one piece tailpipes for $100 or less, so
that's what I'd ultimately do.
Tim Olson - RV-10 N104CD - Flying
do not archive
ddddsp1(at)juno.com wrote:
| Quote: | Tim,
That will be a good test on your plane since you already have several
hours of data to compare it too. Did you ask Larry about putting any
bends or curves in the pipe? Just adding length probably would not
increase exhaust back pressure much but I would think if people got
carried away with putting major bends in the pipes it would change the
dynamics. HOWEVER, as the builder we can do whatever we
want.........build on.
Dean 40449
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Tue Aug 01, 2006 9:19 pm Post subject: Altering the Exhaust? |
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Mike and I talked to John Forsling specifically abaout this (at) OSH, and
he said that the downturn and additional length adds NO back pressure
and creates NO adverse affects on engine performance. He did say that it
would significantly help to quite the noise level in the cockpit, and
keep the belly of the aircraft cleaner.
Deems Davis # 406
Fuse/Finishing/Panel
http://deemsrv10.com/
Tim Olson wrote:
| Quote: |
Dean,
I didn't ask about any bends or curves, but the bends Michael was
talking about are barely bends at all, just a slight downturn
at the end. I really doubt that anyone would be able to get
too wild with the little ends of the exhaust in a way that would
cause big problems. My goal is to see if these extensions,
that should add about 3" of length, actually do anything. I'll
treat them as temporary. If they do anything amazing, I know I
can buy totally new, one piece tailpipes for $100 or less, so
that's what I'd ultimately do.
Tim Olson - RV-10 N104CD - Flying
do not archive
ddddsp1(at)juno.com wrote:
> Tim,
>
> That will be a good test on your plane since you already have several
> hours of data to compare it too. Did you ask Larry about putting any
> bends or curves in the pipe? Just adding length probably would not
> increase exhaust back pressure much but I would think if people got
> carried away with putting major bends in the pipes it would change
> the dynamics. HOWEVER, as the builder we can do whatever we
> want.........build on.
> Dean 40449
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