TIP_Fytr

After speaking with my mechanic who specializes in Mooney’s the touting of the oil lines is good and shouldn’t create heating issues. Thanks for all the info from the forum! Sounds like trailed cowl flaps are the solution during summer operations!

I usually only see 380 in the climb then the CHT stabilizes in cruise between 340-360 across all 4 cylinders. What you said about altitude and temps makes sense thinking about it!

Thanks for the reply! At 10,000MSL the air is much cooler and thought I should be seeing cooler oil temps without trailing the cowl flaps. Cylinder temps are all 380 deg F or less I don’t notice any increase in cylinder temps like I do the oil temp. The oil cooler can be seen in the pictures I posted.

Hello all! I’ve had a 1964 Mooney M20E for two months and have made an observation about oil temperature (as read from UBG-16 Engine Analyzer) that I wanted to share and get insight on to see what the forum thinks: 1. Oil temperature during 120mph climb is 175-180F with cowl flaps full open. 2. After level off I keep it WOT, set 2450 RPM, close the cowl flaps as speed approaches 150mph, and lean the aircraft via LEAN function on engine analyzer. 3. Oil temp slowly increases over the course of 15-20 minutes to 220-225 deg F, at which point I will slightly trail the cowl flaps and the temp decreases to 175-180 within a few minutes. I run 100 deg F ROP and this temp increase with cowl flaps closed occurs at all altitudes and the highest I’ve flown is 10,000 MSL under these observations. Any suggestions as to why this is occurring, if trailing the cowl flaps is a viable solution, or other insight would be very helpful. Below are some photos of the engine compartment.