Quote:
Originally Posted by Railcarmover
I've got a few questions...
how does a higher compression head alter the operation of a gyro style advance on the distributor shaft?
How can you effectively measure the optimum 10 degrees of timing for each 1000 rpm with a quadrant lever?
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Railcarmover, The head doesn't change the timing. The head changes the engine's need for certain timing. Generally, higher compression causes higher peak temp on compression just before ignition. This causes a faster burn, so the engine needs less ignition advance. A similar effect can happen with a cam, manifold, or exhaust change. Different cylinder filling at different rpm's makes the burn rate different, so different ignition timing may be needed.
The only way I know to measure a bob weight type advance at different rpm's is with a tachometer and a timing light.