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On 23 Jan 2001, at 11:06, Miller, Gary (G.) wrote: > I've always wondered what's best (in terms of engine cooling), > > 1. Stock system, heaters on. > 2. Stock system, heaters off. > 3. No heat exchangers, fancase outlets blocked. > > Wondered if the extra cooling air across the engine in 3 would outweigh the > lack of cooling of the exhaust system? Probably not. This is a good question which others have alluded to. I really don't think the exhaust pipes carry any significant heat away from the heads, but I could be wrong. Mostly, I base that opinion on the fact that the exhaust gaskets are pretty good insulators. With the car standing still you would get some extra heat rising up from hot heat exchangers, or J-tubes, but I don't think this will add much real heat load to the engine when it matters (when you're moving and the engine is working hard.) So my vote would be for #3 above. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org