Quote:
Originally Posted by Purdy Swoft
Spark does happen when the points open . Where the rotor tip points controls where the spark goes. Rotor position has more to do with timing than points .I tried to explain this in a previous post . Points gap and rotor tip position must work together if the timing is correct . If the rotor tip doesn't point in the correct place , the engine won't run . In other words spark occurs when the points begin to open . Rotor position controls where the spark goes . If the rotor isn't correctly adjusted it won't matter when the spark happens because the spark would be sent to the wrong place . I try to give helpful info. Timing and brakes are the two main things that so many can't seem ton understand .
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Yes, the rotor tip position controls where the spark goes, but not when! The "when" (or the "timing") of spark occurring is at the moment of the points opening. Point opening is not determined by the rotor tip, it is determined by the lobes on the points cam. Thus timing cannot be determined by rotor tip position.
With the timing pin in place in the timing gear dimple, and the points gapped correctly, and the timing lever fully up, and points cam set so the points are just starting to open, the rotor tip will automatically be in the correct position (unless the 'tune up artist' sets the points cam 1/4 or 1/2 turn off somehow). Again, rotor tip position determines which cylinder the spark goes to, but not when.