KR> Exhaust headres

[gene timpson]

--- On Sat, 10/23/10, mbz...@comcast.net <mbz...@comcast.net> wrote:

> From: mbz...@comcast.net <mbz...@comcast.net>
> Subject: KR> Exhaust headres

Here are a few pieces of info for consideration. There is an STC'ed tuned 
exhaust system for 172's that gives about 8% more power. I've seen it installed 
on AC set up for floats to help with the increased gross weight. 

http://www.piteraq.dk/flight/exhaust.html Has alot of info for the design of a 
tuned system as well as http://www.piteraq.dk/flight/muffler.html for the 
silent muffler to knock down alot of dB's.

I've been working on a friend's plane for a little over 5 years which is now 
flying. It's not a KR but it's great to learn on someone else's dime. 

http://elginwells.com/Pages/Starjammer%20progress%20pix.html The next to the 
last pic is a great shot of the tuned headers and the mufflers. The noise 
reduction has been quite good even w/o the correct roving in the mufflers which 
should be corrected this week. This is a firebreathing monster which easily 
does manuvers most of us can't imagine and has been fun to work on. Take a look 
around Elgin's site to celebrate the joys and freedom of experimental A/C

Gene Timson
gtme...@yahoo.com

> On cars, headers accounted for up to 5% increase in horse
> power. What is the reason 
> why the same can not be true for aircraft conversions? I
> guess at cruise the exhaust gases are efficiently 
> evacuated and maybe headers will not give much of an
> increase in hp. But still I think it would be a benefit 
> for the weight at take-off and climb. And also would
> increase the smoothness of the engine. 
> Looking at the exhaust examples, I wonder if the exhaust
> really is tuned for the engine, or can the back-pressure 
> be smoothed out. 
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
> 

KR> Exhaust headres

[mbz...@comcast.net]

Among all the distractions, I hope no one minds that i get a bit of topic and 
start talking about aircraft conversions 
I was wondering why so far I did not see any headers on corvair engines. 
On cars, headers accounted for up to 5% increase in horse power. What is the 
reason 
why the same can not be true for aircraft conversions? I guess at cruise the 
exhaust gases are efficiently 
evacuated and maybe headers will not give much of an increase in hp. But still 
I think it would be a benefit 
for the weight at take-off and climb. And also would increase the smoothness of 
the engine. 
Looking at the exhaust examples, I wonder if the exhaust really is tuned for 
the engine, or can the back-pressure 
be smoothed out.