Quote:
For the sake of the forum:
60 secs/min * 2 rotations/cycle / 10,000 rotations/min = 12 ms
You generally don't want to run injectors over 80% duty cycle, so the open time will be between 0 and 10 ms. You also have to consider the 0.5 - 1.5 ms latency of injector opening for most systems.
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Don't forget that's milliseconds. 12ms = 12000us (microseconds).
You're exactly right about the startup emissions. Combustion modeling for DI has a long way to come and even if the software was there, small shops like ours would never have access. I haven't had that luxury since school. To be honest though the oems put to much faith in models and not enough in testing.