Talking with some of the racing buddies, I discovered a few things

about tuned exhaust systems. One trick is to paint the pipe with white
paint and run the engine.  Where the white paint burns off, is the point
of tuning. The pipe needs to be cut off about an inch after that. I
removed the PowerFlow muffler insert to do this, and replaced it with a
pipe, so I could paint it. I ran the engine, but could not find the
burnt ring. So go figure???<<<
Does this make any sense? Never heard of it.

Marc Wiese

Burnt ring?  Hell, unless it was very high temp paint, it would all burn off
on my engine.
Not sure if this idea sanity checks or not but if it had any validity, the
engine would probably have to be run at the desired rpm you wanted to tune
for.
The data that Paul posted from Mazda is probably as good as we can get.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

 
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