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On 8 Jun 2001, at 8:04, Richard Green wrote: > Anyone know how much Horsepower does our fans use? What about the CFM on the > fan I would guess there would be a max CFM (cubic feet per minute) rating on > it. I was looking at the fan from my old 71 sqbak, and forgot how small it > is. it looks more like the 911 fan all the upright guys are using. Is it > aluminum or magnesium or a combo like the engine cases? You're probably just looking at a type 3 pulley. It has a bit of a fan function, but most of the work is done by a larger steel fan that is larger and farther inside. I don't think I've ever heard what alloy the pulley might be cast from. The CFM for the fan is in "Without Guesswork." I can check it tonight. This is bound to take significant HP. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org