Engine setup
- V12 60 degree even-fire
- Mounted in a boat (pro-longed high load compared to a car)
- Two spark plugs per cylinder, total 24 spark plugs
- Bosch Motorspor 3x2 coilpacks (4 pcs required for one engine)
- Beru 3-channel ignition modules (min 10 mA drive current)
- One fuel injector per cylinder
- Siemens High-Z 9 Ohm fuel injectors
- 24-1 crank mounted trigger wheel
Due to lack of outputs I will handle the engine electrically as an inline 6 cyl.
Two injectors per injector output.
- Can one FET handle sustained high duty cycle with sufficient cooling?
- Two injectors 9 Ohm results in 4.5 Ohm @ 14 Volts = 3 Amps
Driving the ignition modules
- Six outputs required - using four stepper outputs and two logic level outputs
- Drive current requirement per ignition module input is minimum 10 mA
- Driving two channels is a minumum 10x2 = 20 mA up to 40 mA.
- Can the IGBT logic driver handle this?
- Suitable resistor values on board?
- Stepper outputs are powerful, but current limiting resistors are recommended to protect from short circuits