Jin F, Thanks for the steer to your menu 4 dealing with on-off ratio.

This may be silly question time but I am still confused. I think there is an Electronic Engineer Defintion of Duty Cycle and Fuel Injection Engineer Definition of Duty Cycle and both are floating around here.

On Jim's menu 4 I read that the Lambda = 50% is OK (but what is the on-off ratio?). I still cannot relate that to the nice and simple injector opening time definition of Duty Cycle.

Please can some one clarify what is going on for this simple mechanical engineer?

Regards,