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Re: exhaust wrap


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._./


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