In rec.aviation.owning Jay Honeck wrote:
: I can easily get my EGTs over 1600 degrees, and my CHTs near (or over) 400
: degrees by over-leaning. At some temperature (and I don't know what it is)
: doesn't aluminum start to weaken?
: --

Yeah... about 250-300 degrees. Comforting, no?

Remember that EGTs are useful for *relative* measurements... not absolute.
What one engine/airframe/power setting combination produces for EGTs has very little
to do with another engine/airfram/power setting EGT. It's best used to find the peak,
and to see how even individual cylinders are by dithering around the peaks. Saying
one is at 1550 and another is at 1590 doesn't mean much... one may have a slightly
different position in the EG stream, more resistance inthe probe wiring, etc, etc...
run the mixture above and below to see where *each* peaks (below 75% of course).

Again... absolute EGT number is nothing to be concerned about (within reason,
but it's generally impossible to exceed reason with a certified engine). The EGT is
much more important, and running at or below 400 in cruise is considered acceptable.

-Cory


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************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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