Quote:
Originally Posted by Purdy Swoft
I didn't say that where the rotor tip points controls when the points open !!! I said that where the rotor tip points is where the spark goes . Adjustment of the distributor cam controls where the rotor tip points . The spark happens when the points open . Of course the lobes of the distributor cam controls when the points open . Where the rotor tip points is the most important thing about ignition timing . When the points begin to open is when the spark occurs . These two things control how accurate the initial , ignition timing will end up . If the rotor tip isn't pretty close to the proper position the engine won't run . It is often a waste of time trying to explain a procedure to a person that is more interested in argument than anything else . .
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Not interested in argument. Just trying to clarify the fact that rotor tip position on the points cam is fixed by the slot the rotor fits into. So when the cam lobe is positioned properly the rotor tip will be pointing at one of the 4 posts in the distributor cap, nowhere in between. Obviously the person doing a tune up will set the cam so that the rotor tip is close to #1 terminal in the cap, then will proceed to set the cam lobe so the points are just opening, thereby obtaining correct timing. "If the rotor tip isn't pretty close to the proper position the engine won't run" as you say. This is because the cam lobe is not in position to open the points to cause the spark at the right time. True, you can get initial timing 'in the ballpark' by eyeballing rotor tip position, but setting timing by when the points open will be far more accurate.
I guess this the point I am trying to make: By following Ford's procedure the initial timing will be correct and the rotor tip position will take care of itself.