Dawley Aviation PIREP, or: Atlas is BACK

Jay Honeck wrote:

All in all, a very pleasant experience, and a real pleasure to work with a
guy that's so knowledgeable. In answer to questions, Steve went on at great
length about the metallurgy behind the work, and the reasons exhaust systems
fail. (Incidentally, he said that the best thing that EVER happened to
their business was everyone running "lean of peak" and driving their EGTs up
above 1500 degrees. As temperatures approach 1600 degrees, the metal simply
starts to fail, and you end up saving pennies on gas, and blowing dollars on
exhaust systems.)

That's funny as this isn't supported by the data the GAMI folks have
taken. It shows the EGTs being pretty much symmetrical about the peak.
So if you go lean of peak far enough you should be able to pretty much
equal the temps seen on the rich side of peak. And CHTs are actually
lower on the lean side so you should be saving your cylinder heads some
grief.

http://www.gami.com/frames.htm

Now if folks are running "at peak", then I see Steve's point, however,
"lean of peak" doesn't have to be problem if done properly.


Matt