Phasing
The same thing happens if you have a crank triggered ignition, but are using a distributor instead of coil-on-plug. The dist. must be aligned so that when the crank trigger fires, the rotor is "in range." When using a crank trigger, the spark is electronically moved by whatever controller, ignition, or EFI you are using. In that case, the rotor gets towards "out of phase" at each end of the advance curve, and since there is no mechanical advance (locked distributor) the alignment must be checked carefully. Over the years some weird rotors have been used to assure alignment, such as 4 whangers and 6 bangors
Like this
Below, there are some wider than this, I cannot find what I was looking for. This is for an early GM 225 V6
The same thing happens if you have a crank triggered ignition, but are using a distributor instead of coil-on-plug. The dist. must be aligned so that when the crank trigger fires, the rotor is "in range." When using a crank trigger, the spark is electronically moved by whatever controller, ignition, or EFI you are using. In that case, the rotor gets towards "out of phase" at each end of the advance curve, and since there is no mechanical advance (locked distributor) the alignment must be checked carefully. Over the years some weird rotors have been used to assure alignment, such as 4 whangers and 6 bangors
Like this
Below, there are some wider than this, I cannot find what I was looking for. This is for an early GM 225 V6