>We have also fitted an EI four-way EGT gauge and the readings are
>fascinating (to me anyway). Does anyone have any figures in degrees
>Fahrenheit to work to? For example, never exceed, max peak allowable and
>how many degrees to richen back from that? Also any idea of acceptable
>differences between cylinders in the same bank. Obviously cylinders 1 and 3
>(being the rear two) run hotter. On my ferry flight from the engineer I was
>seeing a range from 1556 degrees hottest to 1444 degrees coolest at 75 - 80%
>power (ie running at max cruise power to run in the new cylinders). My
>engineer tells me all engines vary but any more than 1600 degrees is bad!

Normally aspirated engines generally don't have EGT limits, as they can't
generate excessive heat by their basic design. Turbo-charged engines DO
have limits on the "Turbine Inlet Temperature" (TIT), because they can heat
load the intake air and raise the exhaust temps.

Without checking the calibration of the probes and instrument, I'd accept
the numbers as "relative", and not be concerned with the absolute numbers.

EGTs are controlled by the fuel mixture and power setting. In theory on a
fuel injected engine they ought to be very close. On carburetted engines
they are often 200 F apart front to rear. If you desire to "tweak" the
numbers and group them more tightly, you might contact the Gami-jector
folks about a set of matched nozzles to bring the fuel mixture closer based
on variations of AIR FLOW to the cylinders.

Bob Steward, A&P IA
Birmingham, AL



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