The centrifugal advance built into the distributor drive shaft (under the plate that the points mount on) allows timing to be closer to TDC at idle, and farther from TDC at full rated RPM. This is important for smooth idle and good combustion through all operating speeds. Fuel in the combustion chamber burns with a predictable flame front (leak a trail of gasoline for 50 feet and then put a match to one end. The time it takes to ignite the fuel at the other end is the flame travel rate in air, no compression. The same happens in the combustion chamber, only we can't see it. The change in timing accounts for this variation, which in turn allows maximum cylinder combustion pressure to occur ~ 8 to 10 degrees after TDC. Smooth. Jim
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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