Electric fan for cooling? Options

[teamgravy]

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!

[andrew15]

Endurace racing an aircooled car comes down to a couple of things - cooling, cooling and a bit more cooling.

Last year we had a burned out 911 running in ChumpCar and controlling the heat was the main issue - after 14 hard hours of racing we found a couple of rocker shafts walked due to cam tower expansion. This, along with other failed seals / leaks put us on the trailer.

Keep in mind, this was a rich running 2.4 with the 911 11 blade fan and an external cooler - it still had problems keeping up - we think we needed to have the external oil cooler in a better position

Regards,
Andrew M

[teamgravy]

Endurace racing an aircooled car comes down to a couple of things - cooling, cooling and a bit more cooling.

Last year we had a burned out 911 running in ChumpCar and controlling the heat was the main issue - after 14 hard hours of racing we found a couple of rocker shafts walked due to cam tower expansion. This, along with other failed seals / leaks put us on the trailer.

Keep in mind, this was a rich running 2.4 with the 911 11 blade fan and an external cooler - it still had problems keeping up - we think we needed to have the external oil cooler in a better position

Regards,
Andrew M

Cooling, gotcha...
Yep, I understand that. We run 7+ hours at a time in the Texas heat in our off road car. Cooling is key; 8-9 quarts of oil, a T1 fan and open engine compartment and we still run around 200* if it's hot out.

We have decided to go with the stock cooling system with some minor mods to close off heater channels and get as much air to the motor and oil cooler as possible. We are cutting some of the tins to make it easier to get the motor in/out and work on valve train if needed.

Working on some ducting for the rear deck lid but the pricey stuff won't fly. We are truly doing this legit, paid 600 for the car (+ extra parts) and selling off stuff to get us down to $500 or under to add performance upgrades.

So by purchasing the parts we have for sale you could be helping put a 14 on the podium of some crap can racing series truly solidifying it's rightful place in racing history. http://www.914world.com/bbs2/index.php?showtopic=202397