I KNEW he'd have an answer! And it makes sense, too.
Thanks, as always, Paul!
Geoff Branch
----- Original Message -----
From "Paul Asgeirsson" <pasgeirsson at worldnet.att.net>
To: "Geoff Branch" <gjbranch@comcast.net>; <SDOliner@aol.com>;
<spridgets@autox.team.net>
Sent: Tuesday, July 27, 2004 11:19 AM
Subject: Re: back firing on acceleration
> When you back off the throttle suddenly, the movement of the exhaust in
the
> exhaust system will continue to move, it also has a lot of unburned or
> partially burned fuel, and it wants to suck in air from someplace. So any
> air it gets from outside the exhaust system will be rich in oxygen, just
> what it needs for an uncontrolled burn. Read that as loud bang!
>
> Others are partially right that you might have a too rich fuel mixture,
but
> without the oxygen rich air being added to a hot pipe system, it just
passes
> out the tailpipe as pollution.
>
> Later, Pa
>
> > But Paul: Why would an air leak in the exhaust cause an afterfire??
|