Thread: Timing Problem
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Old 07-08-2020, 09:37 AM   #7
30 Closed Cab PU
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Join Date: Aug 2018
Location: Wisconsin
Posts: 2,243
Default Re: Timing Problem

Originally Posted by 40 Deluxe View Post
I'd like to mention that changing the rotor has absolutely no effect on the timing! The rotor is "keyed" to the points cam lobe (it can only go on one way). "Timing" is the term used to describe the exact moment the spark occurs. That exact moment is when the points just start to open. In turn, the moment of points opening is determined by point gap and the position of the points cam in relation to the position of the piston in the cylinder (it can be at TDC or either before or after TDC). Ideally, initial timing should be at TDC or 1 or 2 degrees after TDC. Once the engine starts, timing of course changes (advances) as you pull the timing lever down.

Trying to set the initial timing by rotor position is like building kitchen cabinets with a chain saw-you won't get accurate results!

True, but I still like using the rotor to confirm it points correctly to cylinder 1 when using the timing pin for TDC cylinder one. If something is wrong there, no need to continue to timing at the distributor cam/points. Rarely is there is an issue with TDC, I just prefer to double check.
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