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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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