2 New Engines & High Temps

[Mich3773]

Oil Temps
I think you need more investigation before you start obstructing the oil cooler. Is winter weight oil being used or a multi-grade? Where is the oil temperature probe located; cooler inlet, cooler outlet, someplace else? There is often a large temperature difference between the temperature at the probe location and true temperature at the outlet of the engine.

Also interesting ....the highest oil temperatures occur post landing!


CHT Temps
I agree, I'd be concerned about the CHTs. The cylinders are big chunks of finely machined metal and need several minutes to cool down. After take-off, climb and transitioning to cruise, I'd suggest taking more time before leaning and closing the cowl flaps.

The rear engine is showing a large spread of CHTs, which results in a large variation in fuel flow to each cylinder. Cleaning CHT1 injector will result in more fuel flow, and will decrease CHT1.

EGTs
EGTs are showing good combustion on on cylinders. There's a wierd behaviour on front EGT2 (temp decrease on start-up???).

[hharney]

Originally Posted by Mich3773

Oil Temps
I think you need more investigation before you start obstructing the oil cooler. Is winter weight oil being used or a multi-grade? Where is the oil temperature probe located; cooler inlet, cooler outlet, someplace else? There is often a large temperature difference between the temperature at the probe location and true temperature at the outlet of the engine.

Also interesting ....the highest oil temperatures occur post landing!

I have dual temp gauges and probes in different locations on my set up. The original factory gauges are reading from the cooler and I have 42 years of experience with them. I feel that I can still trust the factory gauges as I am so familiar with the range that I see based on the ambient temps.

My JPI EDM reads from the front of the case just below the crankshaft. This sees the oil in the motor channels and reads digitally on the JPI. Again because I have so much experience with the factory gauges, comparing the JPI probes is relative to the factory gauges. I feel like the oil is at a higher temp in the case vs the cooler. I like to see about 170 minimum on the JPI. In the winter it's pretty tough to get there even with my covers on.

I run exclusively multi grade Phillips X/C 20-50W only.