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 - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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