How To Tune Your Vintage Mustang for Improved Performance
This is the mechanical advance in an MSD distributor. Flyweights are affected by rotational speed and centrifugal force. As shaft speed increases, flyweights swing outward against spring pressure to advance the rotor timing. Spring tension is what determines advance curve. MSD offers different spring tensions depending on the desired curve. Ford did the same for Autolite and Motorcraft distributors. View Related Article
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