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pooch · 05-21-2014, 05:27 PM

I don't know about model A engines and vac gauges but I do know that it is the best way to set optimum timing on a later engine.

Set revs at about 1200 RPM so the bob weights are advanced and set timing to maximum vacuum and back off just a touch .

This will get your fuel mix to the maximum pressure at 17 degrees after top dead centre where maximum power is obtained.

Maybe I should have tried this on my own A before I sold it.

It would have given me the best place for the spark lever at cruising speed without guessing .

05-21-2014, 05:27 PM	#11
pooch Senior Member Join Date: Sep 2010 Location: South Coast NSW Australia Posts: 2,596	Re: vacuum gauge as diagnostics tool I don't know about model A engines and vac gauges but I do know that it is the best way to set optimum timing on a later engine. Set revs at about 1200 RPM so the bob weights are advanced and set timing to maximum vacuum and back off just a touch . This will get your fuel mix to the maximum pressure at 17 degrees after top dead centre where maximum power is obtained. Maybe I should have tried this on my own A before I sold it. It would have given me the best place for the spark lever at cruising speed without guessing .