Mooney M20E 1975 CHT high but oil temp low

[Gee Bee Aeroproducts]

Send me your seals 

I will duplicate from a 48'wide sheet

You can trace on paper to clean up the design and mail to me 

If send paper diagrams mark the paper up or Down

We want the rear seal facing up so we get a forward bend on the seal for the cowl to drop on

sides bend up/ inward

nose section down 

Gee Bee 

 

[Ragsf15e]

On 1/21/2026 at 2:56 AM, ighazali said:

One of my magnetos is an electronic ignition system not sure if that makes a difference. But it is the surefly one I believe!

You really need to try full rich, full rpm, 120mph, cowl flaps full open in the climb.  It will be hard for you to lean in the climb to target egt as the others do since you don’t have an engine monitor.  I definitely wouldn’t try lop in the climb without an engine monitor.  How do you know all 4 cylinders are on the lean side?  And even if they are, how far past peak?  The red box for lean of peak is pretty big at high power and you have no idea how far past peak each individual cylinder is or what temp each cylinder is running?  Your gage only shows one cylinder.

Also you should definitely get the timing checked.  There were some models set to 25 degrees btdc and then lycoming recommended 20 degrees which is cooler for chts.  It would be nice to know your mags are the same and what they are set to.

I also had a Surefly mag and I didn’t notice any increase in temps.  It shouldn’t advance timing at high power in the climb, but maybe if you’re pulling back the power somehow by trying to climb lean of peak.  I don’t think that’s healthy.

[ighazali]

Great news everyone, I officially know what the issue was. I was running it lean in the climb. I took the advice kept it full rich until my cruise at 7000 yesterday and then I started to lean it and kept it on the rich side and my temps were about 360-380 hard to tell with the bayonet style gauge. However we were well within the green. I had the shop retrim the baffle seals as well and now they sit tightly with the cowling. I am going to get a JPI EDM 830 installed soon! I think its time. Thank you all for the help!

The image shown is after 20 minutes of cruise flight with cowl flaps closed. 

Also this was prior to baffle seals being adjusted.

Edited January 23 by ighazali

[Ragsf15e]

34 minutes ago, ighazali said:

Great news everyone, I officially know what the issue was. I was running it lean in the climb. I took the advice kept it full rich until my cruise at 7000 yesterday and then I started to lean it and kept it on the rich side and my temps were about 360-380 hard to tell with the bayonet style gauge. However we were well within the green. I had the shop retrim the baffle seals as well and now they sit tightly with the cowling. I am going to get a JPI EDM 830 installed soon! I think its time. Thank you all for the help!

The image shown is after 20 minutes of cruise flight with cowl flaps closed. 

Also this was prior to baffle seals being adjusted.

When you get the 830 installed, you can start leaning as you climb to keep your takeoff EGT values constant (they will drop as you climb full rich), however, it is a very small adjustment.  With your current gages, I would just continue to stay full rich in the climb.  Glad you figured it out.