--- 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 >
