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On Wed, 17 Jun 1998, Jim Adney wrote: + + In a normally aspirated engine all the power in the exhaust is going + to be wasted anyway, so no one really cares HOW you waste it. Of + course wasting it in such a way that it makes the engine overheat + would be be counterproductive. It won't *all* be wasted. (If it were, why would we even have headers?) Keeping the exhaust gases hot lowers their drag in a tube, increasing the velocity at the collector. Higher velocity at the collector increases the scavenging effect, thus drawing more intake charge into the cylinders. Not a whole hell of a lot of effect, but if it shaves a tenth of a second from your quarter-mile ET, it's potentially worthwhile.. -- Geoff Melnychuk -=-=-=- http://www.cpsc.ucalgary.ca/~geoffrey _-~-_-~-_-~-\ | gpmelnyc@acs.ucalgary.ca Volkswagen-driving, Beagle-dog-hugging, | | geoffrey@cpsc.ucalgary.ca Bass-playing, Beer-brewing, Lurking nerd. | \._.^`'~*-,._.^`'~*-,._.^`'~*-,._.^`'~*-,._.^`'~*-,._.^`'~*-,._.^`fnord._./