Cherokee exhaust repair?

Hey all... I'm thinking it's getting close to where the mufflers in my Cherokee 180 could stand
to be repaired/replaced. Any thoughts on a good place to have it done? This is the dual-muffler style
as is on the clamshell-cowled later -180's.

Also, I'd be interested to find out if there's any way to get a certified muffler that doesn't
have the internal baffles. The recurrent inspection is kinda a pain, and I could use a little more power
that a freer-flowing exhaust might provide. I know some planes (like my friend's PA-24-250) has a
muffler without internal baffles.... it'd be nice to do the same.

Thanks,
-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

wrote:

Hey all... I'm thinking it's getting close to where the mufflers in my Cherokee 180 could stand
to be repaired/replaced. Any thoughts on a good place to have it done? This is the dual-muffler style
as is on the clamshell-cowled later -180's.

Also, I'd be interested to find out if there's any way to get a certified muffler that doesn't
have the internal baffles. The recurrent inspection is kinda a pain, and I could use a little more power
that a freer-flowing exhaust might provide. I know some planes (like my friend's PA-24-250) has a
muffler without internal baffles.... it'd be nice to do the same.

Thanks,
-Cory

Aerospace welding or Dawley will rebuild your muffler to like-new
condition.

So will Knisley out in Loomis (Sacramento). It is pretty much a function of
where you live to save on shipping charges. There are half a dozen really
good muffler shops in the country.

Jim


Aerospace welding or Dawley will rebuild your muffler to like-new
condition.

In article ,
"RST Engineering" wrote:

So will Knisley out in Loomis (Sacramento). It is pretty much a function of
where you live to save on shipping charges. There are half a dozen really
good muffler shops in the country.

but do they have peanuts? don't forget the peanuts.

--
Bob Noel
(goodness, please trim replies!!!)

Ray Andraka wrote:

Aerospace welding or Dawley will rebuild your muffler to like-new
condition.

I'll second that. I've had work done by both of these shops and I couldn't
tell the rebuilt products from new. Very good quality.

John Galban=====N4BQ (PA28-180)

--
Message posted via AviationKB.com
http://www.aviationkb.com/Uwe/Forums...ation/200708/1

wrote:
Hey all... I'm thinking it's getting close to where the mufflers in my Cherokee 180 could stand
to be repaired/replaced. Any thoughts on a good place to have it done? This is the dual-muffler style
as is on the clamshell-cowled later -180's.

Also, I'd be interested to find out if there's any way to get a certified muffler that doesn't
have the internal baffles. The recurrent inspection is kinda a pain, and I could use a little more power
that a freer-flowing exhaust might provide. I know some planes (like my friend's PA-24-250) has a
muffler without internal baffles.... it'd be nice to do the same.

Thanks,
-Cory

You could use this as an excuse to put on Power Flow exhaust.

--
Jim Pennino

Remove .spam.sux to reply.

wrote:
: wrote:
: Hey all... I'm thinking it's getting close to where the mufflers in my Cherokee 180 could stand
: to be repaired/replaced. Any thoughts on a good place to have it done? This is the dual-muffler style
: as is on the clamshell-cowled later -180's.

: Also, I'd be interested to find out if there's any way to get a certified muffler that doesn't
: have the internal baffles. The recurrent inspection is kinda a pain, and I could use a little more power
: that a freer-flowing exhaust might provide. I know some planes (like my friend's PA-24-250) has a
: muffler without internal baffles.... it'd be nice to do the same.

: Thanks,
: -Cory

: You could use this as an excuse to put on Power Flow exhaust.

From what I've heard (from Art Matteson, IIRC), the dual-exhaust cherokee muffler setup already has a very low
backpressure exhaust. The Powerflow helps the most on the Cherokees with the single muffler near the firewall. Besides, I'm
pretty sure that if we changed exhaust, we'd lose our autogas STC.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

On Aug 22, 10:03 pm, wrote:
.... Besides, I'm pretty sure that if we changed exhaust, we'd lose our
autogas STC.

-Cory
************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

I don't see how installing a Powerflow exhaust will invalidate an
autofuel STC.

150flivver wrote:
: On Aug 22, 10:03 pm, wrote:
: ... Besides, I'm pretty sure that if we changed exhaust, we'd lose our
: autogas STC.
:
: -Cory
: ************************************************** ***********************
: * Cory Papenfuss, Ph.D., PPSEL-IA *
: * Electrical Engineering *
: * Virginia Polytechnic Institute and State University *
: ************************************************** ***********************

: I don't see how installing a Powerflow exhaust will invalidate an
: autofuel STC.

The autofuel STC is very complicated for -160 and -180 hp PA-28's. Unlike for 150 hp -140's or -150's, the Petersen
PA-28 high-compression STC is more than just a sticker for the fuel filler on the tank. Basically, the ones that are even
applicable must have the dual exhausts. If they have the aluminum, flip-up cowling they are not applicable due to vapor-lock
issues with the muffler near the firewall. Even the ones applicable require replacement of the electric fuel pump with dual
(redundant) electric fuel pumps and some re-plumbing.

Bottom line is that with a different exhaust, the autofuel STC would most likely have to be re-approved, which would
amount to doing a whole 'nother autofuel STC certification.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

I'll second that. I've had work done by both of these shops and I couldn't
tell the rebuilt products from new. Very good quality.

That's because it *is* new. The whole "rebuilt exhaust" thing is
absurd. They start with a two-square-inch piece of a collar off your
old exhaust system, construct the whole thing with new material, and
call it a "rebuilt".

Kinda like "rebuilding" a P-51 Mustang starting with nothing but a
data plate.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"