Your vac advance is usually done while your under wide open throttle as carb vac over comes manifold vac and the suckem line is one the carb thru the up side of the butterfly . Olivers are the only one i can think of that used this, now granted i do not work on that many off colors. I H I H uses the centrif. advance and at full rated engine speed ya got it all and speed is pulled down so does the advance start backing up . To check them it's nice top have a dist strob/ machine where ya can see what is going on at engine speeds . Like everything they ware and things change over time due to the ware ya end up with more advanced timing then ya want or the retard springs break and really mess things up . Some stick and now do nothing . Not many of us old goats around that can still set up a dist to work like it should or change it to make things go better . all depends on what the engine is used for and how many RPM's it is going to turn. . World of difference between a race engine and a working pulling engine Took me a good while to get that thru my thick head as the advance wioll start to fight you if tomuch when the engine is coming down due to load . On Ford cars from back in the late sixty's early seventy's had a double vac system , once the engine started at Curb timing and the vac came up one side of the dist would pull back ing. timing as much as 10 degrees ATDC then when ya went wide open throttle between base set and Vac ya came up to 34-38 degrees BTDC . one side drew on Manifold vac for retard and the other side went on carb vac. for the power side . .Lots of problems with that once . Chrysler use to try and set base at TDC on Std. shift cars like the Road Runners , Super Bee's GTX and Chargers ,that lead to a ton of back fires while tryen to start and lots of french fried air filters and air filter housings . Us guys that worked on them did not go by EPA rules and bumper the ing. base timing to 10 Degrees BTDC and now your Mopar started like a Ford on a sub 0 day , No more the Chrysler long wind up on the starter hopping it was going to start. . On the ones i work on with the ones not stuck or broken springs i find them to be over advancing due to ware.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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