Dick,
Thanks so much. Updated data collect from today with dial-back timing light, disconnecting manifold vacuum, manually holding engine to desired rpms at carb linkage, etc.
Vacuum:
18” at 700 rpm idle (vacuum line connected to dist),
17” at 450 rpm idle (vac line blocked to dist).
Advance:
16 degrees with no vacuum advance at 450 (low idle because no vac advance),
18 degrees with no vac advance at 600 (held throttle linkage)
38 degrees at 500 rpm idle with vacuum line connected (manifold vacuum under rear carb of tri-power)
Mechanical advance: 38 degrees at 2500 rpm holding throttle linkage (vacuum line blocked)
Total advance: 48 degrees at 2500 rpm with vacuum connected and no load, just holding center carb throttle linkage.
So, I’m pretty happy with this configuration. It previously had 12 degrees initial and was much more sluggish and running hotter. If I find I can drop to non-ethanol 93 octane gas I would likely pull the spark back to 12 and try that as I assume it will ignite much sooner. I’m just not sure yet how this engine was rebuilt and what it requires.
Thoughts?
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