[Christ]

I'm noodling this myself, using a small, low power electric motor, mounted between the diesel engine and transmission.

The idea is to disable idling on the injection pump, and run a controller on a micro switch at the fuel pedal, so that the first inch of pedal travel would activate the electric motor at full power, which would start the car moving. At the top speed of the e motor, engage a clutch between the e motor and banger, effectively "bump starting" the diesel.

The setup would allow one to use either motor. Haven't worked out charging or the like, or any type of adopted deactivation of the e motor circuit, etc.

I'm thinking some sensor to determine if the banger is running could cut the circuit to the e motor drive side, and a circuit to determine state of charge and throttle position could be used to engage regenerative engine braking.