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Thread: Oil Cooler By-pass

  1. #1

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    Oil Cooler By-pass

    Has anyone in the experimental crowd installed a by-pass valve to divert oil around (rather than through) the oil cooler? Seems like it might help in cold conditions to be able to control the oil temperature from the cockpit. Maybe quicker warm-ups too.

  2. #2

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    That’s what your Vernatherm or viscosity valve does.
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  3. #3

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    Bill Rusk has a valve with control cable on his if I remember right, but I am into the red wine tonight so might be someone else.
    DENNY

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    PerryB's Avatar
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    A Vernatherm does in fact cause the oil to bypass the cooler. A viscosity valve does nothing in that regard until the oil pressure hits about 100 psi., and then only the oil that's being "dumped" (a small %) is bypassing the cooler. If you were to bypass the cooler with a valve, I think you'd want to use a blending-type valve (in reverse) so there is no hard "off" position.

    -- For faster warm-up I bring mine up to 12-1300 RPM, pull on carb. heat and then peak the mixture. This way I have warm air going through the sump and the mixture is correct so its not fouling plugs.
    Last edited by PerryB; 02-06-2018 at 05:52 AM.
    After Monday and Tuesday, even the calendar says WTF !
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  5. #5
    n40ff's Avatar
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    Why not a sliding shutter over the oil cooler, inlet or exit?

  6. #6

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    Well, here's my thoughts, for what they're worth:

    The Vernatherm seems to be there more to protect the oil-cooler from the excessive pressure caused by cold oil. It's not precise enough to control the oil temperature. Covering the oil cooler with duct tape is a guessing game, and obviously can't be adjusted in-flight. A controllable shutter over the cooler gets mechanically complicated. But a valve with a by-pass line would allow precise oil-temperature control from the cockpit. I don't think it would hurt anything to have 100-percent by-pass for warm-up - after all, in very cold weather I've been covering 100-percent of the cooler with duct-tape.
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  7. #7

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    My interpretation isn’t that the Vernatherm doesn’t work but rather the cooler works too well. Controlling airflow through the cooler solves the problem for lots of guys. Duct tape is the popular choice. Van’s and Dan’s have been selling adjustable cooler doors for years. They provide adjustability from the panel. My new plane has butterfly valves in the cooler outlet ducts. I wouldn’t want a flow valve in my oil lines but if it interests you? Go for it.

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    Bill Rusk's Avatar
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    NunavutPA12

    Here is how I did it. Part numbers etc. It is all here.

    You have to scroll just a little to where it starts.....

    http://www.supercub.org/forum/showth...l=1#post686807


    I love it!!!

    Hope this helps

    Bill
    Very Blessed.
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    Consider the climate in which you operate and the potential for a congealed oil cooler. I like the idea that my coolers are flowing warm oil but with restricted cooling better than metering a small amount of oil through a cooler that's got excessive cooling potential. I'd be concerned about the cooler being congealed when I opened that valve and the ability for oil to free it up while in flight in sub-zero temps.
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    cruiser's Avatar
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    Van’s supplier for the shutter stopped making them, just before I decided to buy one, never fails. So there is an opportunity for some young entrepreneur.

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    cubdriver2's Avatar
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    Quote Originally Posted by cruiser View Post
    Van’s supplier for the shutter stopped making them, just before I decided to buy one, never fails. So there is an opportunity for some young entrepreneur.
    Peter, I think he's talking to you

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  12. #12

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    Anyone know if Dan's Aircraft still sells his version? That's the one I've seen used.

    Here's another option. https://antisplataero.com/products/o...er-air-shutter

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    PerryB's Avatar
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    Quote Originally Posted by stewartb View Post
    Consider the climate in which you operate and the potential for a congealed oil cooler. I like the idea that my coolers are flowing warm oil but with restricted cooling better than metering a small amount of oil through a cooler that's got excessive cooling potential. I'd be concerned about the cooler being congealed when I opened that valve and the ability for oil to free it up while in flight in sub-zero temps.
    Good point.
    After Monday and Tuesday, even the calendar says WTF !

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    cruiser's Avatar
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    Quote Originally Posted by stewartb View Post
    Anyone know if Dan's Aircraft still sells his version? That's the one I've seen used.

    Here's another option. https://antisplataero.com/products/o...er-air-shutter
    That looks remarkably identical to the Van’s

  15. #15
    Farmboy's Avatar
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    Quote Originally Posted by cubdriver2 View Post
    Peter, I think he's talking to you

    Glenn
    I’m sure he’s not, he said “young”.


    Transmitted from my FlightPhone

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    Oil Cooler By-pass

    Quote Originally Posted by NunavutPA-12 View Post
    Has anyone in the experimental crowd installed a by-pass valve to divert oil around (rather than through) the oil cooler? Seems like it might help in cold conditions to be able to control the oil temperature from the cockpit. Maybe quicker warm-ups too.
    Larry Vetterman has installed one on the cub he built.


    Sent from my iPad using SuperCub.Org mobile app
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