The TractorVet attempted to explain this but his self-fangled wording kind of took away from the true explanation. What he was explaining is ..ported vacuum.. Most road vehicles from the 40s up through the 70s used this. This configuration places the signal port or opening for the vacuum advance supply just above the throttle plate at idle. So for one the vacuum advance (VA) at idle is inactive so there is no fluttery idle from to much advance. Secondly, as you just open the throttle a bit the edge of the throttle plate moves over the port activating the VA, advance of the spark at this point helps reduce throttle ..tip in.. bog working in conjunction with the accelerator pump. Third, while cruising the VA continues to be activated varying with load to help eliminate detonation and increase fuel economy. Lastly on deceleration the throttle is closed deactivating the VA reducing exhaust back fires.
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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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