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Manual states Oil Temp shall be min. of 122 degrees F.

I live in Northern Colorado. In the summer time, it takes about 10 minutes with about half the OIL Grill duct taped.

In the winter, I have well over 3/4 the grill duct taped and it is taking about 25 minutes to get above 100 degrees. Outside temp has been in mid 30s to 40 degrees F.

I figure with the engine running for almost a half hour, that at 100+ degrees it is safe to Run-up to 4000 RPMs for 2 minute Ignition check.

As soon as I'm at Pattern Altitude, the Oil temp is reading between 170 & 180 degrees.

Now that I've done this twice in the past month, I'd like to hear from other owner's, especially living in the north, what their experience is.

  • Re: 912ULS min Run-up temp issue

    by » 3 years ago


    Maybe Altitude has something to do with it? I preheat the oil below 50f so not sure how long it takes to get 120 from 30. The other day it was 7 below f I preheated to 47 and it took about 5 minutes to hit 120


  • Re: 912ULS min Run-up temp issue

    by » 3 years ago


    Wow. I forgot to mention that I use a Tanis Heater prior to start and my Oil Temp was 51 degrees F. It then took th 25 minutes to get above 100 degrees. My airport, KLMO, is a little above 5,000 MSL


  • Re: 912ULS min Run-up temp issue

    by » 3 years ago


    I have never had any problems getting my engine to run-up temp (50ºC) within about ten minutes, even when it's nearly freezing outside; I'm at an altitude of under 500ft, but I'm not sure why altitude should make a difference.

    What does your oil pressure look like when you take it to 4000 rpm at only 100ºF?

    170ºF seems quite low for cruise or pattern work.  I think you would want to get it up to at least 200 to avoid moisture problems.

    Are you sure that your sensor is working properly?


  • Re: 912ULS min Run-up temp issue

    by » 3 years ago


    The problem with high revving at low temperatures is that the Oil Pressure spikes.
    To speed up the warm-up process, set the brakes and advance the throttle to ~60psi of Oil Pressure.
    As the engine warms up the pressure will drop and you can again advance the throttle to hold 60 psi.
    By the time you reach 50°C (~125°F) you will find you are Wide Open and still under 60 psi.
    Go Fly!


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


    Thank you said by: Sean Griffin

  • Re: 912ULS min Run-up temp issue

    by » 3 years ago


    Thanks for your advise


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