Quote:
Originally Posted by krisr
Has the timing been checked since you put it back in and ran it? Also Are you running an MSD box by chance or is your distributor a ready to run?
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It's been a long running question by many. Only answer I've seen is that it's how they received the engine from the dyno. It all should really be checked over. It was missed in the beginning of this thread as well and turned out to be the issue.
Like I've said, that noise is very common in many engines I've had here, and it turns out to be engines that don't really like a lot of ignition lead at idle. Whether it's too much initial, or a combination of initial with vacuum advance added, creates a pre ignition knocking noise, mostly heard at idle. Notice in the video you can't here it when it's revved. I came to the conclusion that some engines are just more efficient than others and don't want or need a bunch of initial timing, and this is likely one of those engines. With tight quench, a good cylinder head with an excellent combustion chamber, a bit of compression etc... On the dyno it doesn't matter much, but things change when put into service.
That's why I've mentioned in the beginning of this thread I'd want to know exactly what those numbers are and where they occur. Most likely you'll end up putting the smaller stop bushing in that MSD for more advance so you can back down the initial timing and put the total where it made best power for Paul on the dyno.