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flatjack9 · 09-25-2014, 05:22 PM

Just to digress here a bit. I always see it said that the vacuum piston stabilizes the rotating disc in the distributor. With vacuum applied, the piston is withdrawn from contact with the plate. So how can it do any stabilizing? I think if the spark is erratic, it is due to worn parts in the distributor.

09-25-2014, 05:22 PM	#18
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,608	Re: vacuum advance disabled Just to digress here a bit. I always see it said that the vacuum piston stabilizes the rotating disc in the distributor. With vacuum applied, the piston is withdrawn from contact with the plate. So how can it do any stabilizing? I think if the spark is erratic, it is due to worn parts in the distributor.