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Bertram31.com General Bulletin Board
Re: Gauges - Final Selection
Posted By: Vic Roy In Response To: Re: Gauges - Final Selection (Bob S)
Date: Thursday, 18 November 2004, at 10:38 p.m.
No such thing as a dumb question. EGT is Exhaust Gas Temp. A gague that gives the tump of the exhaust gas at the manifold. Range we usually see is 750-1100 degrees F. On piston engine airplanes, it's the gague you use to lean the gas/air mixture at altitude as the air outside gets thinner. In aircraft, the trick is to lean the mixture to get the highest EGT, then richen the mixture a little (and the EGT goes down some)to keep from burning valves and other internal parts. On water cooled diesel engines, say Cummins diesels, the purpose of an EGT gague is to measure load, since we can't vary the feul/air ratio as we can on an airplane engine. Rule of thumb is that on a Cummins 6BTA, EGT should run below 900 degrees at cruise with a full load. 1000 degrees wil burn stuff up or cause rods, etc to break after some time.
In my view, unless you are running over 300 deisel a side, the EGT - and boost for that matter - are really not that important. With the modern diesels, all you really need to look for is RPM at full load exceeding the rated engine RPM, on the Cummins by 50-100 RPM, then you are propped right and not overloading the engine. Poor man's EGT is the infrared temp. gun, shooting the exhaust stacks at full load, and look not just for raw temps, but variance over say 10%. Super quick and cheap way to i.d. a burnt vlave or stuck injector.
UV
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