Water thermostat temperature

by Claus Mortensen in 912iS Technical Questions 5 years ago

Hi all

We finally installed a water thermostat in a plane with 912 iS. According to the operating manual the operating interval is 90-110 degrees Celsius. (194-230F)

The thermostat we got (from the airplane manufacture) is opening at 85C (185F). That means it will keeps the temperature around 82-83C (180-181F).
I would really like it to be > 90C but according to the manufacture, this is the only thermostat available.
The oil temperature is around the same, perhaps a little lower. My guess is, that it will be higher if the water temperature is higher.

My question is. Is it okay to run with 82-83C or should I try to look for a thermostat opening at >90C ?

Kind regards, Claus

Re: Water thermostat temperature

by Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 7.98k

Many planes are constructed without a thermostat at all.

The thermostat is there to speed up the initial heating of the engine to get you to >50°C as quickly as possible.

Once the thermostat opens the actual temperature is determined by the dozen variables of the cooling system, Radiator size, Air-flow, ambient temperature, engine power, etc.

If you normally fly at cruise near 5000 rpm you just are not making a lot of heat.

Try flying closer to 5500 rpm.

>80°C is fine. If it makes you feel better, try blocking off a portion of the radiator.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Claus Mortensen

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Water thermostat temperature

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