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Originally Posted by logansc
That was a great tutorial on overheating rear cylinders---thanks for the info GMC! I have the opposite problem; overheating front cylinders! I'm seeing very high temps during climb that sometimes cool down in cruise (but occasionally don't!). I have to nose the airplane over to 170 to 180+ indicated sometimes to get them to come down. Any ideas? RV-4, IO-360, C/S, "standard" Lycoming 360 GAMInjectors, JPI Instrument engine monitor (all cylinders). My rears are running 330 to 350, the fronts 420-430 during 120-130 mph climb, they slowly cool down after level off, but sometimes still stay above 410-420 for several minutes. Engine sounds and runs well, plenty of power, mag checks fine, leans properly, etc.
Shiloh
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The RV4 cowling may be way different, but it still seems physically impossible for the fronts to run hotter than the rears. I'd bet a buck you've got the probes wired backwards. Next flight, disconnect your #1 probe and see which one drops out on your JPI.
I'd check the wiring
Linear Mode
