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Thread: Elec cooling fans VW

  1. #11
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    My thoughts, and I know just enough about VW's to be dangerous, you'd be going from hidden cylinders by the dog house to hidden by pretty big fans. If Rex's calculations are correct and I trust them, 10 HP of fans is a fairly large fan, not to mentions the additional power requirements to drive them, even short term.

    I gotta admit, I like the "out of the box thinking" and really like the idea of sprucing up the look of the VW engine with uncovering and polishing the cylinders.

    I don't thinks you will ever find a "better design" than what the germans did, the VW is tried and true, but you might come across a design that works for those low speed times and free the engine from the dog house ...
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    20+ Posts chopptrk's Avatar
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    Quote Originally Posted by FuzzyWuzHe View Post
    My thoughts, and I know just enough about VW's to be dangerous, you'd be going from hidden cylinders by the dog house to hidden by pretty big fans. If Rex's calculations are correct and I trust them, 10 HP of fans is a fairly large fan, not to mentions the additional power requirements to drive them, even short term.

    I gotta admit, I like the "out of the box thinking" and really like the idea of sprucing up the look of the VW engine with uncovering and polishing the cylinders.

    I don't thinks you will ever find a "better design" than what the germans did, the VW is tried and true, but you might come across a design that works for those low speed times and free the engine from the dog house ...
    Ok, I never said I would "hide" the cylinders with "big pretty fans". Acually I said maybe mount fans "below" the cylinders. And sorry but I think 10 hp fans are WAY overkill, especially when Rex has NO fans.

    And I'll agree, but I'm not looking for a better design than the germans for a CAR, this is a bare bones trike. Bring something to the table other than "he said".

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    Watne,

    A couple of thoughts about fans under the cylinders. Incorporate a lower shroud similar to the stock VW car shroud but put the opening facing forward. Mount the smaller pancake fans at the front opening pushing air back into the shroud. This would accomplish 2 things. It would keep the fans out of the engine heated air flow and the shrouds would act as air rams at speed. The air flow would follow the natural convection flow path upward.

    VW cars needed the larger fans and elaborate tin work because the engine was surrounded by a body and they needed to force the cooling air down, against the natural air path of heated air, and out from beneath the body.

    Here is pictures of the typical lower shrouds. They normally hang off the tins above the cylinders with the curve forward and the flat end rearward. This was to direct the heated air out the back from under the car. These are usually the first thing to come off a dune buggy, baja bug, or trike application.

    cooling tins01.jpg

    cooling tins02.jpg

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    20+ Posts chopptrk's Avatar
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    Now that's a good idea Tom, coming from the bottom of the cylinders then looking forward, join the two sides into a single 8" intake with a fan. All under the trike. One of these days,,,Oooone of these days.

    I'm still surprised that there's not some kind of elec fan kit for buggies and kit cars and such, like from EMPI, haa.

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    300+ Posts LarryA's Avatar
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    I,m thinking a richer mixture and advanced timing at low engine speeds would help with cooling also....the fans with tins underneath sounds like a workable idea. thinking that tins should be designed to use road draft to help pull air thru at road speeds if possible.

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    400+ Posts vwbug72501's Avatar
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    Quote Originally Posted by chopptrk View Post
    Now that's a good idea Tom, coming from the bottom of the cylinders then looking forward, join the two sides into a single 8" intake with a fan. All under the trike. One of these days,,,Oooone of these days.

    I'm still surprised that there's not some kind of elec fan kit for buggies and kit cars and such, like from EMPI, haa.
    I was thinking that with a smaller (fit the duct opening) fan on each side, the fans would "freewheel" when powered off at highway speeds. Ducting to a central common duct might add too much restriction and affect the high speed operation. It would also add a lot of bulk under the trike and mess up your lean trike look.

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