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Thread: One hot O-235 - oil cooler solution?

  1. #1

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    One hot O-235 - oil cooler solution?

    I have a PA12 with a O-235-C1 engine in it. The motor has little time on it - all new baffling - and a recently overhauled carb. This plane/engine combination has always seem to have a higher than desired oil temp. On a nice summer day - she can run around 220 and higher. I want to cool this baby down! Anybody have experience with an oil cooler install on this plane/engine? I am thinking about a left side forward baffle ( ahead of the #2 cyclinder) mounted oil cooler - any suggestions on size of cooler/brand - where I can have the lines made? Up sides/downsides?

  2. #2

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    My -12 always ran right around 220* also. I think this is the norm for these planes.Maybe FortySix12 will comment. I think his ran up to 240.

  3. #3
    behindpropellers's Avatar
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    You might see if you can incorporate Steve's Aircraft oil cooler on your 0-235. You also should make sure you gauge is calibrated correctly.

    Tim

  4. #4
    WWhunter's Avatar
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    I've got a 7AC Champ that has an O-235 installed. The oil cooler is on the rear baffling, left side (viewed from sitting in the plane.

    WW
    Don't take life too seriously ... no one gets out alive!

  5. #5
    105 Special's Avatar
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    Piper 46, I have a 1950 PA18 Super Cub with a 0235C1 also, and I've always been concerned with the oil temps mine normally runs about 205 to 210 at 2250 rpms.
    If I run it at 2450 (which the engine manual calls performance setting) it will run about the same as what you are getting. I called Lycoming and was told these temps
    where ok not to be to concerned with them. Keep me posted on what you do with yours.

    105 Special

  6. #6
    DesperadoPilot's Avatar
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    I have an 0-235 C1 in my Cub. It usually runs right at 230*. This is normal.
    I fly IFR (I Follow Roads).

  7. #7
    cubhunter's Avatar
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    0235 oil cooler

    I had a champ yrs ago with a 0235 in it and it also ran 210 and higher and when i put it on floats it was running to hot ..I installed a oil cooler on the left rear baffle had to by a oil cooler adapter for oil screen area and it did the trick.. ran 190 to 200 on floats after that..

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    Runs hot cooks water out no rust lasts along time.

  9. #9
    irishfield's Avatar
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    Quote Originally Posted by RAC cubs View Post
    Runs hot cooks water out no rust lasts along time.
    Exactly.. don't change anything!

  10. #10

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    Does the o-235 have a vernotherm? If so, is it working properly?

  11. #11
    Steve Pierce's Avatar
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    No oil cooler, no vernatherm. I ran one to 2600 hrs. and tore it down, rings were the only thing worn out. It ran 230 dgrees in the hot Texas summer. I think if you put a coller on it she will run to cold and not get the moisture out.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  12. #12

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    IF you consider the temp to be a problem a couple quick thoughts are:

    1. Leaning in flight should result in a slight RPM increase.

    No increase=too lean

    2. A band-aid would be to attach a small fixed type of cowl flap at

    the egress of bottom cowl.

    I think the "float-guys" use this.

  13. #13
    cruiser's Avatar
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    My PA-18-105 has an 0235C1 with an oil cooler using an adapter under the oil screen to flow oil to the cooler. I am trying to add an ECI oil filter adapter in place of the screen. ECI is not helpful with info on using the oil filter adapter in conjunction with the oil cooler adapter. My concern is where should the vernatherm go? In the filter adapter and removed from the cooler adapter? Don't necessarily want oil going to the cooler all the time. Obviously don't need two. Remove the cooler? Anyone used both? Advice? Thanks, Jim

  14. #14
    cruiser's Avatar
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    Still working on oil temps. The baffles under the front cylinders are solid under the barrels of the front cylinders back to the rear cylinders, seems correct by part number according to Univair. My PA-12 baffles were not like this. I don't see how the front cyl's cool well. Anyone addressed this on their airplane? Pic as best I can. Jim
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  15. #15

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    I had the same high temps on mine years ago. I ended up putting an oil cooler on it because I didn't like those high temps. It's interesting that it has a 2400 hour TBO with those higher temps.

  16. #16

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    Jim,
    That does not even look right as far as cooling is concerned. I can understand the barrels having some baffling around them - but a plate under the actual cooling fins of the cylinders makes no sense. If you have a reference for the PA-12 baffles - I would almost try removing the ones on the plane and try the PA-12 configuration. I have old baffles if you need a template. This is a Super Cub? I would think the baffling would be that much different - I'm not that familiar with the Super Cub baffle layout.

  17. #17
    Steve Pierce's Avatar
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    That is how the baffle is on the PA 16 with the O-235-C1and PA20 with the O-290D

    Here is a thread with pictures and drawings. http://www.shortwingpipers.org/forum...engine-baffles
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  18. #18

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    Do you have a 337 for this installation?

  19. #19

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    Quote Originally Posted by Beyeview@aol.com View Post
    Do you have a 337 for this installation?
    Nope, sold that plane in 1996.

  20. #20

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    Quote Originally Posted by Indabush View Post
    Nope, sold that plane in 1996.
    What was the N number? I can get the 337 from OK City.

  21. #21

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    N53950

  22. #22

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    Quote Originally Posted by Indabush View Post
    N53950
    Interesting. When I accessed this N number, it's attached to a Bellanca?

  23. #23
    skywagon8a's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    No oil cooler, no vernatherm. I ran one to 2600 hrs. and tore it down, rings were the only thing worn out. It ran 230 dgrees in the hot Texas summer. I think if you put a coller on it she will run to cold and not get the moisture out.
    I've had the same experience. Ran these engines in Piper Colts well past TBO until they leaked too much oil. They just keep plugging along.

    If you have baffle questions, see if you can find a Colt to look at.
    N1PA

  24. #24

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    Quote Originally Posted by Beyeview@aol.com View Post
    Interesting. When I accessed this N number, it's attached to a Bellanca?
    Yeah, it was a Citabria. Same engine, same problem. It was a field approval. The plane was destroyed chasing coyotes after I sold it and had been de-registered by the new owner.

  25. #25
    skywagon8a's Avatar
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    Quote Originally Posted by Indabush View Post
    Yeah, it was a Citabria. Same engine, same problem. It was a field approval. The plane was destroyed chasing coyotes after I sold it and had been de-registered by the new owner.
    Don't know what model your Citabria was, but that engine is approved under the Type Certificate for several different models. No field approval required. http://rgl.faa.gov/Regulatory_and_Gu...20Rev%2073.pdf
    N1PA

  26. #26

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    I've got a Super Cub with O-235C

  27. #27

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    I have not actually seen under the cowling of the Citabria with the 0-235 Lyc.This guy insists there is no oil cooler.

  28. #28
    Steve Pierce's Avatar
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    Most aircraft I have worked on with the O-235 do not have an oil cooler. Piper started installing oil coolers on the O-290s.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  29. #29

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    And they were great big monsters, too. Thanks Steve. This engine does not have an oil cooler. I have received a few really good hints on where to go with this. Going to have to bundle up and get to his hangar. Again, I appreciate all the input and good advice. Wonder if it is too much to hope he has a maint. manual. Of course, if he did he probably wouldn't be calling me, ha ha.

  30. #30

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    I have a 0-235L2C in Taylorcraft F21 and have the opposite problem. Oil temp is always low. 120 in the dead of winter and a max of 190 on floats in the heat of summer in western NY. No oil cooler. Check you baffles.

    Jim

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