Ray B. writes: >>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. <<
Oh!! Just because there is posted on the I 'net some
statement that says in effect that the EGR does cool the
exhaust, then that makes it a fact!!! Not hardly!!
Explain the process to a layman here, please.. I
understand how an intercooler on a turboed engine
cools the air prior to it entering the throttlebody or
carb or whatever, but the return plumbing from the
exhaust to the throttlebody/carb/intake doesn't go
thru any such device. It is plumbed directly into the
throttlebody/carb/intake from the exhaust.. Where
does it get "Cooled"???? There is nothing I see
that seperates the burnable exhaust from the spent
exhaust either, so in effect you are merely leaning
out the mixture in the combustion chamber which has
always meant Hotter combustion temps and is
subject to burning holes in pistons.. Now if you could
someway convince me that only the burnable gasses
were rerouted back to the intake, then that might
cool the combustion chamber because it would be
making the mixture(air/fuel ratio) richer, and the richer
the mixture, the cooler & therefore less likely to burn
pistons etc... I'm open to any and all tutoring here,
but you've got your work cut out for you if you intend
to convince me..
"One of the hardest things in life to learn is
which bridge to cross and which bridge to burn"
Azie
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