Forwarded: Header insulation

[Sandy]

At 09:59 AM 7/4/96 est, you wrote:
>
>I can't imagine you'll get too many mpg's out of this exercise, since 
>once the exhaust heat is out of the combustion chamber it can do no 
>further useful work, whatever its temperature (unless you have a 
>turbocharger).  It's just waste heat from the exhaust port onwards!

I don't think that this is really true, I recall that the density of the hot
gasses tend to expand when exchanging heat with the header causing a kind'a
clogging effect. Also, wrapping the exhaust with some heat preserving wrap
will most definitely change the engines mixture to be on the lean side. I
think that this is again related to the better efficiency in the exhaust
system. I'll let some of the experts follow up with the scientific
explanations...You wont get dramatic changes in MPG in any case. I have done
this to a 372 chevy, and it allowed me to move up a couple of jet sizes,
thus allowing more fuel to be burn and more power.

[chomp]

Sandy