> -----Original Message-----
> From: Azie L. Magnusson
<snip>
>
> How do hot exhaust gasses being rerouted back into
> the combustion chamber "cool" the the CC?? They
> have to be hotter than the ambient air coming in thru
> the throttle body!!!
Believe it or not, this time Bernd is correct. :-) Quote from
www.about.com :
"The EGR valve helps your car more efficiently and completely burn fuel by
recirculating a portion of your exhaust and running it through the
combustion process again. This results in a cooler, more complete burn of
the fuel which decreases you car's noxious emissions by prohibiting the
formation of some harmful gases." There's more info there if you're
interested.
Basically the EGR functions at high vacuum conditions, such as steady
cruising speeds where the ignition timing is also quite advanced. It cools
the combustion process a bit and helps avoid detonation/pinging while
promoting cleaner exhaust emissions as well.
Ray
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