Quote:
Originally Posted by Bob Bidonde
I have a Model "B" engine with a 6:1 compression cylinder head. Timing is standard for a Model "A", that is it's set at the TDC of the power stroke of cylinder #1. While cruising, the spark lever range is limited to 4 notches down to avoid knocking.
To restore a more useful spark advance range at the lever, the distributor cam needs to be retarded from the standard Model "A" setting. How many clicks of the cam?
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Is this why you originally asked about plug gap? Because your engine knocks easily with too much advance? The two are not related, really.
If you set the initial time 2 clicks retarded, then you will use 2 additional clicks to get back to where you are now when it starts to knock. No real benefit there.
Better to find the source of the knock.
1) What spark plug are you using? They may be too hot.
2) How confident are you that your initial timing now is really at TDC? How did you set it? Because if it is really advanced initially, that's why you can't advance much more before it knocks.