Thanks Brian.
It's taking me some time to absorb what you said.
Still not sure I have it all, but I'll keep pondering it.
NOTE: This is not my build it is gpineau's.
I'm just enjoying the discussion/learning..
Our previous discussion was just about the trigger point for the injectors.
gpineau had stated he planed to base his trigger point, of the fire signal (that signal would change with the timing),
I made the point that the signal from the pick up coil might be better because that signal would not change with
the ignition timing.
We agreed that the pick up signal would be the best trigger source.
Still trying to wrap your 85% point, into the plan to use 1 injector to fuel 2 cylinders.. ie; Pondering continues.
I know 1 injector per pair of cylinders will work, but when to spray the fuel, and for how long is confusing...
My assumptions are; the (1) injector will fire each time one of those (2) cylinders is on a intake stroke.
At 10,000 RPM's, this will happen 10,000 times per minute. {each cylinder would have 5,000 intake strokes)
An injector sprays at a constant rate, so pulse width determines how much fuel is delivered.
As RPM's increase, the time that the valve is open becomes shorter.
If the delivery is a constant rate, but the amount of time is less at higher RPM's, you would have to spray fuel into the
intake before the valve opens.. (to ensure enough fuel is available when the valve is open)
Opening the throttle allows more air, so fuel quantity must also increase. (ie; longer pulse width)
In my mind that suggests your 85% figure indicates; a properly sized injector fires 85% of each rotate {at WOT}.
That 85% of one rotation needs to be before (and during) the time that the valve is open.
At 10,000 RPM's, this has to happen 10,000 times per minute, with pulse width, and injector timing varying. {as RPM's change}.
Am I on the right track??NOTE: I am not speaking for gpineau.
Just trying to understand a bit more... Both of you know more about this than I.
I particularly want to hear what gpineau thinks about my pondering..
Good discussion!!
Ride safe, Ted