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Posted by: LotusJoe Apr 12 2010, 02:29 PM

Has anyone ever measured the exhaust pipe temperatures at the point where they bolt to the heads? I used my Ray-tek gun and got temps from 600 to 700 degrees. Not sure if that is a meaningful place to measure.








I used to own tug boats with 12 cylinder Locomotive engine - 2000 hp, and it was not unusual to see 900 to 1000 at the exhaust flanges, but I'm not sure there is any correlation between the two types of engines and applications.

Posted by: McMark Apr 12 2010, 05:51 PM

Pipe temp is not relevant.

Posted by: ME733 Apr 12 2010, 06:21 PM

.......................correct......I agree.

Posted by: Russ Apr 12 2010, 06:26 PM

I have EGT sensors on the headers and the exhaust temp runs about 1400F. But it really depends on how hard you running the engine.

R

Posted by: McMark Apr 12 2010, 06:34 PM

Russ is right, but to be clear that's EGT not pipe temp.

Posted by: LotusJoe Apr 12 2010, 07:46 PM

Thanks Guys, I didn't feel like it was the appropriate place to measure temp. but thought I would ask anyway. I also checked the temp at the head temperature sensor (between #3 and #4) and it is only about 180 to 190 degrees. Does that seem about normal?

Posted by: McMark Apr 12 2010, 07:59 PM

Unfortunately, that temp gun is not really precise enough to measure your engine running temps. The points you're scanning for CHT are on the outer edge of the cooling fins. The temp you're interested in is the temp at the combustion chamber. The fins are made for cooling, so if you're seeing 300+ degrees on the outer edges, then you combustion chamber is literally melting.

You're heading in the right direction, but you need the right tools. The Micro100 EGT and CHT gauges are available from Aircraft Spruce and for about $300 you can have both readings available all the time your driving.