You are correct.
However, I should have been more clear: I was talking
about part-throttle pinging. It was a problem I had
with my '66 that was caused by an overly aggressive
(i.e., worn out) vacuum advance. I could stop the
pinging by accelerating harder. (Which drops vacuum
and dials back the advance.)
Finding the right advance was tough. Year One had it.
I have had no trouble since installing it.
Chris H.
60 NY T&C
66 Crown Convertible
66 LeBaron
--- dardal@xxxxxxxxxxxxxxx wrote:
>
> > Note on vacuum advances from the mid-60's: The
> most
> > common ones available are set up for the emission
> > controlled needs from 1965 on - called C.A.P.
> They
> > provide nearly double the advance (up to 17.5
> degrees)
> > and if installed will cause your early 60's engine
> to
> > ping like crazy. Be sure you are betting the
> right
> > one.
> >
>
> Chris, you may be more familiar than I with the
> early 60 big blocks, but the
> vacuum advance advances only at part load. Engines
> typically ping at full load
> where there is zero vacuum, so the vacuum advance
> setting has no effect. I
> think it may be unlikely that an engine without
> deposits will ping at part
> throttle if proper octane gas is used. More advance
> at part load could help
> gas mileage and reduce coolant temperature a bit by
> reducing exhaust
> temperature.
> D^2
>
>
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