Pulse widths & duty cycle

[rr]

Well, since I probably started this. If you were reading my previous post, it
had mostly to do with TBI systems. Kinda like a two-barrel carb with
and injector hanging over each bore. (Yes, there are also single barrel
TBI's).

I guess the most important part of it, is to remember that the injectors
are sync'd to an ignition event (For the most part). All you need to do
then, is to figure out how it's tied to them.

TBI's alternate injectors. So each ignition event fires that other injector.
This is with an ecm such as the '747.

Batch fire port and sequential systems are different again. But still
tied to an ignition event.

hth's

BobR.

Barry Tisdale wrote:

> Ok, now I'm confused -
>
> WHAT is the available time for the injectors to fire?  Is it every
> revolution of the *crank*, in which case, there's 10ms available @ 6000
> RPMs, or is it 20ms, in which case, we're talking about camshaft revs.
>
> Batch-fire PFI, I thought, was once per *crank* rev, i.e., every 3rd or 4th
> ignition pulse, depending on V6 or V8.
>
> ??????
>
> Barry
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