On Sun, 19 Nov 2000 23:09:18 EST Longstreth24@aol.com writes:
> Just bought a '62 MGA Mk II and I'm having some trouble with run-on
> after
> turning off the ignition switch. I've played with the carbs (tried
> running
> richer) and have adjusted the timing, but I'm having no luck.
>
> A read that chamfering the tops of the cylinders might help prevent
> this, but
> that sure sounds extreme.
My 1622 motor would do this all the time, too. Even after a complete
rebuild with new pistons, valves, and all carbon removed. I think the
problem is that it is just a high compression engine and without lead
boosting the octane it will diesel. I just learned to bump it in second
gear (foot on brake) to stop it.
In addition to Barney's suggestions, the A-Antics tech manual suggests
rounding the "widow's peak" between the valves on the head. The metal
comes to a point there and supposedly can cause a hot spot.
David Littlefield
'62 MGA MkII
'51 MGTD
'74 MG Midget vintage racer
'88 Jaguar XJ-S
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