Finally replaced the MSD box

[tortuga]

So I ordered an adjustable rotor and cut a hole in a spare cap next to #1 terminal in order to see the rotor once I get the new rotor.

So the plan is to shoot the rotor with the timing light and adjust it such that the the base and total timing positions are equidistant from centered on the plug post. I’m only running 14 crank degrees between base and total timing so the angle in the dizz should only be 7 degrees.

Guessing that the swept circumference of is on what a 4” circle, the circumference Is about 12.5” or .035”/degree...7 degrees is only .24”, less than the width of the rotor tip.

I’m thinking I should therefore be able to adjust the rotor so that all spark occurs with the rotor tip always next to the cap electrode.

Thanks

Steve H
1764

[Gaz64]

Yes, so rev the engine to half way up the retard curve, and the rotor should be centred on the cap terminal.
The purpose of an adjustable rotor.
Gary

[tortuga]

So I made a check cap out of a spare by hole sawing a window from the top of the cap right next to #1.

With the timing light, initial is just short of the terminal, full advance is overlapped...pretty good, but with the adjustable rotor I’ll be able to get it overlapping all the time.

Thanks again for pointing me down this road! ESP Gary!

Steve H
SP 1764

[Gaz64]

Steve,

Once you get the knack of everything combined, you can target less terminal overlap on the "high rpm side", say 40/60, rather than 50/50.

Gary