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Old 08-19-2021, 06:34 AM
HBpilot HBpilot is offline
Join Date: Apr 2010
Location: Ocala, FL
Posts: 88
Default Higher CHT but lower EGT

I have a O360 4 cylinders.
Number 4 cylinders is constantly showing CHT about 30deg higher (400 deg),than the 3 others cylinders, while being 50 deg EGT lower than number 2 cylinder. If the probe is not an issue, what could be the reason ?
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Old 08-19-2021, 07:29 AM
sailvi767 sailvi767 is online now
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,389

EGT is mostly meaningless relative to CHT. The CHT 30 degree difference is not really a big issue unless it’s a change from how the engine normally operates. Lots of threads on here about baffling and airflow and how it effects CHT. If it recently jumped 30 degrees I would be concerned otherwise probably not a issue. You are probably pulling air for the oil cooler from that cylinder location.
RV-6 sold
F-1 Rocket
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Old 08-19-2021, 08:07 AM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 6,732

MANY reasons for one cyl too be consistenly hotter than others and most reasons are related to cooling, not engine problems or performance. EGT variances even more so. EGT temp reading is highly dependant upon probe health and placement.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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Old 08-19-2021, 07:10 PM
HBpilot HBpilot is offline
Join Date: Apr 2010
Location: Ocala, FL
Posts: 88

Ok thanks.
Just a little bit more difficult to lean, but i can live with it.
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Old 08-19-2021, 07:25 PM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,114

Carb engines are not always able to get an equal mixture to each cylinder--thus CHTs can vary between cylinders.

Couple tricks others have used are to back off the throttle a little bit, or add just a bit of carb heat.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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