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On 2 May 2002, at 17:42, Steven Ayres wrote: > Is one of these concepts correct, or is neither significant? Is there enough > external air pressure at the louvers (Square/Fast, Notch and Ghia all pull from > different places) to feed both these hungry beasts just fine? If you look at the little tube that the normal combustion intake comes thru (the one just to the right of the cooling air intake bellows) then I think it's clear that you could get a lot more air out of the fan housing heater outlets, of which there are 2. Certainly, there is a limit to the air that you can get from ANYWHERE, but those fan outlets will provide WAY more than the stock setup. Look at the inlet impedance to the fan, it's HUGE. It would be almost impossible to come up with a more free flowing intake. Then we pick up a tiny amount of boost from the fan. The flow impedance via the stock cooling fan is probably 50-100 times better than stock. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org