I could never get my Spit to knock, no matter how far
I advanced the timing. Even after I milled the head,
getting maybe 9:1 compression, it never knocks, even
with 87 gas and the timing a couple of degrees more
advanced than the spec.
I wish I knew what Spit knocking sounded like. Is it
extra-loud, like all the other engine noises I hear?
Or do all the other noises tend to mask it?
If anybody has an earwitness report of Spit knocking, I'd like
to hear about it...
Doug Braun
'72 Spit
At 12:27 PM 11/6/01 , Jim Muller wrote:
>Okay, campers, some info if you please. I've gotten my GT6 carbqs worked
>out pretty well (thanks to Jeff at Racetune for his help), so I wanna' start
>optimizing the timing. It has no idle retard unit, so I'm using the static
>timing spec as a guide to the idle timing. It is set 2 deg later than the
>static spec right now on the premise that I'm not really running 1970
>quality gas. What I'd *like* to do is check it at various rpm's higher up
>to see how well its centrifugal mechanism is working. The onliest thing is,
>though, I have no such specs. Ultimately I'll have to do the "listen for
>pinking" thing, but the more pieces of info, the better. (The car can be so
>noisy sometimes that I'm not sure what I'd be hearing anyway!)
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