Oh Boy, now you tell me, well I am beyond the point of no return on this hot rod
engine thing. I am wondering about your combustion chambers and sharp edges. I
know my head has some sharp areas after the big valves and seats were put in.
Guess I will take the time to smooth them down in hopes of avoiding stepping on
a duck. Jim 66SV
Rocky Frisco wrote:
> Christopher Albers wrote:
>
> > I've had this problem (dieseling) ever since the completion of my
> > highly modified 1725 (now 1800) engine and have not been able to fix
> > it. The compression is about 10:1 and I only use 92 octane fuel. I've
> > played with the advance (which is about 6-8 deg 'cuz I have an Isky SB2
> > cam) and the carbs to no avail. I have settled for the cheap fix
> > (thanks Dick Sanders) of putting on the parking brake and smoothly
> > releasing the clutch as I shut off the ignition. But it is still a
> > very annoying problem.
>
> I even went to the trouble of fitting a whopping big anti-run-on valve to my
> intake manifold (on the Cooper S). As soon as I cut the ignition a valve
> opens the intake manifold up to about 1/2" id outside air to flow into the
> manifold. It didn't do a damned thing. No change at all.
>
> Sometimes after I turn it off, about ten seconds later it goes "whumpf" out
> the exhaust, sort of quietly, like an old lady farting. ;)
>
> I have just recently got my Edelbrock mixture monitor to working fairly
> well. It says I'm marginally rich right through the entire range. I'm going
> to tune to please its little lights and see if that helps the run-on.
>
> -Rock, trying to take his own advice.
> --
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