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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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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