John Appel

If the engine runs with batch fire each injector squirts once  every engine revolution which means twice per engine cycle (720 degrees). In the equivelant sequential system the injector squirts only once per engine cycle. This means the pulse width in batch fire would need to be half as long as in sequential to deliver the same amount of fuel per engine cycle. At idle the pulse width even in sequential would be very short if the injectors are sized to deliver sufficient fuel at full throttle with  a duty cycle of about 80%. In batch fire the pulse width would need to be half this time which would be getting pretty short. What would be the minimum pulse width in milliseconds which would still give accurate control of the fuel delivered.

If the engine runs with batch fire each injector squirts once  every engine revolution which means twice per engine cycle (720 degrees). In the equivelant sequential system the injector squirts only once per engine cycle. This means the pulse width in batch fire would need to be half as long as in sequential to deliver the same amount of fuel per engine cycle. At idle the pulse width even in sequential would be very short if the injectors are sized to deliver sufficient fuel at full throttle with  a duty cycle of about 80%. In batch fire the pulse width would need to be half this time which would be getting pretty short. What would be the minimum pulse width in milliseconds which would still give accurate control of the fuel delivered.

I have  a question which is not directly Link related but someone may know the answer. In 1999 Harley Davidson adopted fuel injection for their V twin engines. For one year only they had a cam position sensor. After that there was no cam sensor. How did they run their injection system on a V twin without a cam sensor.