Tech'ish question. Inquiring minds want to know.

[jlagnese at massed.net (John S. Lagnese)]

Low backpressure.
John
----- Original Message ----- 
From: "Scourge" <scourge@cogeco.ca>
To: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Tuesday, May 23, 2006 9:33 PM
Subject: Tech'ish question. Inquiring minds want to know.


So I've been wondering.

What makes a car backfire? Not regular loud single shot backfires, but the 
awsome little pop pop pop some cars have on heavy downshifting.
 My golf used to do it like mad, I loved it. Made it sound so raw and 
hardcore, lol. Non of my rocco's have ever done it.

One guy I know once told me it was cause by small holes farther up the 
exhaust(I guess he meant near the DP) that while leaking a bit would also 
create a sort of scavenging effect and pull some air back into the exhaust 
system. That air had oxygen in it and could then act as an accelerant with 
the bit of unburnt fuel and it would ignite in the exhaust, thus creating 
the "pop pop pop" when downshifting. I have no idea how accurate this is.

Any thoughts/input??

-George -missing crazy things my golf could do(like shoot flames out the 
tailpipe!)
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