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Thread: Oil temps too low

  1. #1
    Marc Davis's Avatar
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    Default Oil temps too low

    I have a PA-22/20 150. The oil cooler has been relocated to the rear baffle (stewart STC). It has excellent baffles. It has a remote oil filter. It has a 185 deg Vern-a-therm. I'm having a hard time getting the oil temps up. With about 50% of the cooler blocked the temps were 140 deg today OAT was 40 deg. In the middle of summer, with the full cooler open, the temps run 135 deg. I have tested the oil temp gauge and it is working fine. Does this seem reasonable? My next move is to block the whole cooler. I really want to get the oil temps to 185 deg.

  2. #2
    Administrator Steve Pierce's Avatar
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    Default Re: Oil temps too low

    I have my entire cooler blocked of and the oil temp was 190 degrees at 50 degrees OAT.

  3. #3
    Gilbert Pierce's Avatar
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    Default Re: Oil temps too low

    Quote Originally Posted by Marc Davis View Post
    I have a PA-22/20 150. The oil cooler has been relocated to the rear baffle (stewart STC). It has excellent baffles. It has a remote oil filter. It has a 185 deg Vern-a-therm. I'm having a hard time getting the oil temps up. With about 50% of the cooler blocked the temps were 140 deg today OAT was 40 deg. In the middle of summer, with the full cooler open, the temps run 135 deg. I have tested the oil temp gauge and it is working fine. Does this seem reasonable? My next move is to block the whole cooler. I really want to get the oil temps to 185 deg.
    I have the same setup. I have to block 100% of the cooler when the OAT hovers around 40 degrees or lower.

  4. #4
    Marc Davis's Avatar
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    Default Re: Oil temps too low

    Ok, Thanks guys. Looks like I'm on the right track.

  5. #5
    McDaver63's Avatar
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    Default Re: Oil temps too low

    My oil cooler is still in the front on my PA22/20-135. I have about 2/3's of it blocked off and I get up to about 175 degree. I used aluminum speed tape to block.
    I fly because it releases my mind from the tyranny of petty things

  6. #6
    Wag-builder's Avatar
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    Default Re: Oil temps too low

    Am I missing something here? If you have a 185 degree Vern-A-Therm what good is blocking the cooler? I checked mine and it open at 180 degrees and if my oit temp is running cooler than that my oil cooler is still cold, so what did I miss?

    Steve

  7. #7
    Pacer42Z's Avatar
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    Default Re: Oil temps too low

    Quote Originally Posted by Marc Davis View Post
    I have a PA-22/20 150. The oil cooler has been relocated to the rear baffle (stewart STC). It has excellent baffles. It has a remote oil filter. It has a 185 deg Vern-a-therm. I'm having a hard time getting the oil temps up. With about 50% of the cooler blocked the temps were 140 deg today OAT was 40 deg. In the middle of summer, with the full cooler open, the temps run 135 deg. I have tested the oil temp gauge and it is working fine. Does this seem reasonable? My next move is to block the whole cooler. I really want to get the oil temps to 185 deg.
    I am also wondering, if you have a 185 deg. Vern-a-therm, then the oil cooler should not even come into effect. Only getting 135 deg. in the summer is also a concern. I'm not sure where you live, but if the temperature is above 70 deg. you should have no problem to get the oil temperature up to 180 deg.

    Juergen
    Pacer N3342Z

  8. #8

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    Default Re: Oil temps too low

    What temp should I be looking for in my O-320 A2B with a front oil cooler? Pa-20 150, if that matters.
    Thanks!

  9. #9
    Wag-builder's Avatar
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    Default Re: Oil temps too low

    From what I understand from talking to the people at Lycoming is you want to see 180 degrees. Their explaination is the oil temp in the sump is 50 degrees hotter and therefore getting the oil over the 212 degree point thus boiling off any water/ moisture in the oil. Remember the temprature is taken at the screen/ filter so it will indicate cooler than the sump temp. Piper says at 40 degrees and below to install the winterization kit (cover the cooler) and the is for the cowl mounted oil cooler.

    Steve

  10. #10

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    Default Re: Oil temps too low

    Very good info, thanks!

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