Injector Sizing: REALLY dumb question

[Gary Derian]

I think the early TBI system pulsed the injector at a fixed frequency and
varied the duty cycle.  The 4 cyl Iron Duke engines were this way in '82??
I remember watching one at idle with the air cleaner removed.  Reving the
engine did not change the pulse frequency.  This was just a by the eyeball
observation.  Seems plausible.

Gary Derian <gderian at cybergate.net>

>2. A TBI setup is not required to fire each injector once per intake
>stroke, so conceivably, they could go to a longer pulse at longer intervals
>to take care of idle and real light loads. (Again, I don't know--do they,
>anybody??

>
>Regards, Greg
>