Posted by The tractor vet on December 30, 2012 at 20:06:01 from (76.212.230.32):
In Reply to: Re: Vacuum advance posted by B-maniac on December 30, 2012 at 17:16:48:
Most vac. advance systems use Carburetor vacuum rather then manifold vac. Now some dist. of the OLD days had a dual vac system one part did run on manifold vac. to retard the timing and one to advance the timing when carb vac overcame manifold vac.And was a real pain in the arres. Ford used this back in the late 60's and early 70's for emission . You had to remove the vac lines to set the curb timing then hook the vac lines up and it would chop five to 8 degrees off the set And caused a lot of driveablity problems and grief for us working on them and a ton of mad customers . as for a WORKING engine they do not need the extra advance as most do not get much over 2500 RPM. and most do not go over 28 degrees total advance . Myself i ran a 390 FE block Ford on the streets and the strip and i did not have a vac advance on the dist. that i ran as it was all centrifugal all the way. Also tractors of the day did not run the high compression of a car engine and gas powered trucks do not run a high compression And there are truck dist. that do not have a vac advance in them but they do sometimes have a gov. retard To hold back top RPM.
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