What Would Cause Lower EGT's?

[Geico266]

I have good history data on my IO-540 when I balanced the injectors. 2 Years ago the #6 cylinder would run around 1275F. Now it is only 1175F, All of the EGT's were within 100F, but now this cylinder is throwing it off. CHT's are normal at 275-300F depending on power setting.

In flight mag check shows temp rise on both mags when they are turned off, one at a time of course.

Last compression check was a year ago and 76/80.

Is it possible for an engine to need to have the injectors balanced again over time? I've put 200 hours on it since I did it last.

Any ideas?

[TSwezey]

Fouled plug? Or too much fuel.

[Ironflight]

Single transducer going bad?

[John Clark]

Originally Posted by Ironflight

Single transducer going bad?

Paul beat me to it. I would suggest looking at the instrumentation first. Swap the transducer with another cylinder and see what happens.

John Clark ATP, CFI
FAA FAAST Team Member
EAA Flight Advisor
RV8 N18U "Sunshine"
KSBA

[Geico266]

Originally Posted by Ironflight

Single transducer going bad?

Originally Posted by John Clark

Paul beat me to it. I would suggest looking at the instrumentation first. Swap the transducer with another cylinder and see what happens.

John Clark ATP, CFI
FAA FAAST Team Member
EAA Flight Advisor
RV8 N18U "Sunshine"
KSBA

I hope that's all it is! I didn't even think of that. Great idea! and cheap!

It's too cold to pull the cowl off and experiment. When it warms up I'll dig into it.

Thanks!