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Subject: Engine Cooling

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steveVa    Posted 11-30-2017 at 19:16:15 [URL] [DELETE]        [Reply] [No Email]  
  • Engine Cooling
  • Does anyone know how to calculate the btu's created by a 4 cylinder motor??
    I always wondered why you could not air cool a small water cooled engine.
    I figure that water cooling became necessary with V8 motors because there was no way to get much air between the cylinders.
    The old VW opposed 4 was air cooled, but the newer Subaru which is very similar is water cooled.
    I wonder if you could blow enough volume of air through a water cooled motor to cool it? I know from heating and cooling for buildings that CFM= 1.08 X DeltaT , but I do not know how many BTU's a Motor produces. I guess I could figure out how many btu's by the number of gallons per hour the motor would consume.
    I have a Subaru motor that I want to put in a dune buggy, but I would rather not have a radiator sticking out of it...

    Bruce(OR)    Posted 12-01-2017 at 00:24:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine Cooling
  • Place radiator facing down. Install electric cooling fans on top of radiator forcing air through it. Fan thermostat installed into radiator hose.

    Island Mike    Posted 12-01-2017 at 00:18:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: Engine Cooling
  • As engines made more power, they needed to get rid of the extra heat. So they went from air cooling to liquid cooling. On some of the air cooled engines oil coolers were added. If you make enough power, you need liquid cooling and oil cooling. These things are on high horsepower bikes. An exhaust valve can reach 2200 degrees. If the heat is not taken away quickly enough, things will expand, bend, crack, warp and break. We experienced all of this, with air cooled engines in bikes. They work fine until you increase the power.
    Some liquid cooled engines had lousy water flow, and overheat if pressed hard.

    Unless you can add many cooling fins, I think the engine will overheat and fail.
    Some stationary engines had cooling fans as part of the flywheel, that blew air over the cooling fins. Most generators will have this.

    A radiator and electric fan, or belt driven are easy enough to set up. I do know you can cool 7.5 horsepower with one square foot of exposure to the water your boat is floating in. That is with a liquid cooled engine, and there are a variety of ways to have the ocean on one side, and the engine cooling liquid on the other.

    Island Mike

    Farmer Dan    Posted 12-01-2017 at 00:01:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: Engine Cooling
  • I do not think it would work. Need to have heat fins to draw the heat out of the block, then moving air clears the heat fins. With the water jacket there is no place for the heat fins. Be best to bite the bullet and use a radiator.

    dave#1    Posted 11-30-2017 at 20:56:19 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Engine Cooling
  • Not sure about the BTU stuff but highly doubt you could convert "ANY" size water cooled engine to air cooled, It just wouldn't be able to cool it's self due to it's water cooled design .

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