Electric fan for cooling? |
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Electric fan for cooling? |
teamgravy |
Jan 20 2013, 04:38 PM
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#1
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Newbie Group: Members Posts: 17 Joined: 9-November 12 From: Austin Member No.: 15,128 Region Association: Southwest Region |
We are building a track car for endurance racing in Lemons/Chump Car series from a 74 914-4 1.8/carb converted. Rules state we have to spend no more than $500 on the car minus the safety equipment (seat, cage, tires, wheels, brakes, etc..)
I am thinking of leaving off the 914 cooling system and much of the engine tins and running a electric fan to cool the motor. The fans are cheap $70 for 2100 CFM fan and I can also use some big ducting to cool motor at speed. Elec is free (no night racing) right and no HP drain. Just loosing the 50lbs of fan/ducting on the front of the motor seems worth it. I would build a shroud and use some of the existing tins push air across the jugs and heads. I would relocate the alternator above the oil fill/breather and run it off the small AC pulley that was behind the fan. Would love to buy a DTM or Fat 911 conversion kit but not allowed in budget. I was wondering what the peanut gallery thinks of this. Is this going to give me cooling issues? Will ALT function from smaller pulley? Thanks! |
brant |
Jan 22 2013, 09:52 AM
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#2
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914 Wizard Group: Members Posts: 11,739 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
Jake, Chris, AJRS, and others did a lot of work on overhead fan and electric fan cooling.
it is much more complicated that just dumping the air onto the motor you have to try and keep the temperature consistent across all 4 of the cylinders and heads. So the duct work under your electric/overhead fan is the truly important part this was tested on the dyno extensively I have seen electric cooled 914's they work for short sprint races the AJRS ones were total loss systems and running no alternator, or a transmission driven alternator. the oil pump won't fail and you probably won't be touching the valves hot the front shroud is magnesium... all of the duct work together is probably closer to 20lbs total. I run a 914 race car without the chassis side shelves but its a sprint car brant |
ChrisFoley |
Jan 22 2013, 10:23 AM
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#3
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I am Tangerine Racing Group: Members Posts: 7,958 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
I run a 914 race car without the chassis side shelves but its a sprint car Removing the side tin and engine shelves won't adversely affect engine temp through a long race - as long as the car is in motion most of the time. However,this won't make topside access much better for parts swapping or valve adjustments. Its still easier to work from below on most engine maintenance. It does improve visibility however. |
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