Rotax 912iS overheating

[ofergd]

A few answers and comments.
I am running a 912iS with computer controlled ignition and fuel injection. At full throttle it runs rich but below 97% power it turns to economical lean of peak, there for it runs hotter than the regular 912 ULS.
The big overheating problem is when on the ground while taxiing.
Anyway, thanks for the advise

Ofer Gd

[Gawilkie]

Not all oil coolers are equal in their ability to cool oil. My five kit came with an Earls cooler it could not handle the temps for the 912uls, it was located at the front of the cowling. I tried everything but it still ran too hot. I called Kitfox and John McBean told me the new oil cooler and the different mounting location would cure the temp problem. He was correct, now I have to tape parts of the oil cooler to get the oil up to temp. Cht and oil temps are somewhat related high oil temps contribute to overall engine temps. If you have the old style oil cooler replacing it with the new style will probably cure your problem.

[ofergd]

Also all cooling is related, I have problems with cooling the water. Oil tempetatures are high, but OK. Coolant temperatures are too high. I have an old type Rotax heat exchanger approximately 4" by 18" that I got with the kit. I just purchased the currant Rotax cooler with the same cross section area, and looking for an installation configuration to get sufficient cooling.
Maybe I should have baught the larger cooler from Jhon.

[Jaguar56]

Pulling plane out of annual I was at the runup area holding for inbound planes. Fairly stiff wind. I had turned the plane to watch inbound and the coolant temps started climbing fast. OAT about 85. Reached red and I shut it down.

Thinking I might have an issue, turned the plane in the wind and waited a few minutes. Started things up and seemed to hold a little over 200. Decided to launch and stay in the pattern. Once in the air the temps fell down to normal.

Lesson for me was to try and keep it in the wind as much as possible on the ground. Heat backs up fast when wind comes from the rear.

[efwd]

Hmmm. Good to Know. thanks
Eddie

[aviator79]

Lesson for me was to try and keep it in the wind as much as possible on the ground. Heat backs up fast when wind comes from the rear.

I teach my students to point into the wind in the runup area, and make the turn to check for traffic on final just before taking the runway. When air isn't blowing through it, the cowl makes a fine insulating blanket.