Good evening.
I have been working on adapting a General Motors HEI ignition module to a dirt bike.
Preliminary testing has been successful. Nice hot blue spark, runs well.
Only one more hurdle to overcome.
A two-stroke dirt bike needs to retard the ignition timing in the higher RPM range.
The GM module does have the pin for grounding (Pin E, circled in blue), which will retard the timing 10 degrees. Normally the vehicle's computer (ECM) will do the grounding when needed.
My question is this: is there some recommended circuit I could build that will ground Pin E at a certain pick-up coil speed or voltage? I'm thinking maybe a transistor circuit that sends Pin E to the ground at a certain point, maybe? Up to this point, Pin E is simply open. If I can develop a circuit to ground and open Pin E at certain points, this project will be deemed a success. Any help would be greatly appreciated. Thanks
I have been working on adapting a General Motors HEI ignition module to a dirt bike.
Preliminary testing has been successful. Nice hot blue spark, runs well.
Only one more hurdle to overcome.
A two-stroke dirt bike needs to retard the ignition timing in the higher RPM range.
The GM module does have the pin for grounding (Pin E, circled in blue), which will retard the timing 10 degrees. Normally the vehicle's computer (ECM) will do the grounding when needed.
My question is this: is there some recommended circuit I could build that will ground Pin E at a certain pick-up coil speed or voltage? I'm thinking maybe a transistor circuit that sends Pin E to the ground at a certain point, maybe? Up to this point, Pin E is simply open. If I can develop a circuit to ground and open Pin E at certain points, this project will be deemed a success. Any help would be greatly appreciated. Thanks