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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 » 5 months 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 » 5 months 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 » 5 months 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 » 5 months 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
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Sean Griffin

  • Re: 912ULS min Run-up temp issue

    by » 5 months ago


    Thanks for your advise


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