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Having some difficulty setting my timing using a vacuum gauge on my 48 New Yorker 8 cyl…..and could use some guidance. I’m trying to find the timing “sweet spot” rather than just rely on the book specs. I’ve attached my vac gauge to a non-ported vac source at the carb base…(it usually reads about 17-18”)… then adjust my idle as low as I can get it…about 350 rpm or so….to keep the mechanical advance from kicking in. Did not disconnect vacuum advance because it is not supposed to activate at low RPM. Next, the procedure is to advance the timing until you get the highest rpm...just before it drops of. The problem is the more I advance, the more RPM I get…until I can’t turn the distributor any further (about 12-15 degrees (which I know is way too far). What should happen, is that at some, point the RPM should decline when the timing is too far advanced…but it doesn’t. I would expect the RPM “fall off” to show excessive advance, but that’s not happening….(FYI, points are set to specs and read about 28 degrees of dwell). The manual calls for 2 degrees ATDC, but with modern fuels I’ve been told most people run about about 2-4 degrees advance; I’m currently at 2 degrees BTDC based on my timing light. Can anyone tell me what’s going on?
