EGT Accuracy

James M. Knox wrote:
"O. Sami Saydjari" wrote in
:


Actually, I am able to run about 40 degrees lean of peak and the
temperatures at cruise are about 1380. Fuel flow is about 11-12 gals
per hour.


Okay, here's something "interesting." You are running pretty high power
settings there... up probably around 85% (at 12 gph LOP).

Well, I should say that my fuel flow gauge says 12 gph, but my actuals
are closer to yours at 10.9 gph.

At LOP it's
probably okay to cruise that high (because the pressure pulses are lower at
peak, and more spread out). How's your CHT's?

Growl. I do not have valid CHTs at the moment because of a poor job
installing a tanis heater. I will have this corrected next month. I
hate being blind to my CHT readings. And I just baught my plane, so I
do not know what the CHTs notmally run.


I typically cruise at 10.5 gph (75% power LOP), with the RPM back down to
around 2300. My EGT's will be in the 1450+ range. CHT's will be down
around 300 - 340 or so. Interestingly enough, the time I see really high
EGT's (trying to push over 1550) is low power, down at about 25" or less.
An annoying side-affect of our fixed-timing engine ignition systems.

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James M. Knox
TriSoft ph 512-385-0316
1109-A Shady Lane fax 512-366-4331
Austin, Tx 78721
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