Usually Dieseling is just that - intake mixture is being drawn in and
igniting on hot-spots in the combustion chamber. It is true that Dieseling
often results in the engine spinning backwards just before it finally stops,
but this is the 'last gasp' of Dieseling as under normal circumstances what
is in the exhaust isn't combustible enough to continue the process. Until
the engine *does* reverse, and stop, Dieseling can continue for some time.
Dieseling *always* starts while the engine is rotating in its normal
direction, which is why a properly functioning anti-runon valve *always*
prevents it. As I have said a couple of times, the above is correct for all
normal engines, without defects, and in a correct state of tune, but as we
know from experience there can be many factors which cause abnormal events.
PaulH.
----- Original Message -----
From: "Rocky Frisco" <rock@rocky-frisco.com>
To: <mgs@autox.team.net>
Sent: Sunday, January 11, 2004 8:49 PM
Subject: Re: Engine won't stop
> Paul Hunt (T) wrote:
>
> > Is it really Dieseling? That rocking, rolling shuddering running? Or
is it
> > running normally?
>
> It has been my experience that an engine, while "dieseling," often runs
> backwards. This can be observed while it is occurring. This means it is
> running on combustible gasses from the exhaust system being drawn back
> into the engine. As such, no disconnection of the ignition system or use
> of an anti-run-on valve will stop it.
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