For some reason, my mail client refused to send a reply so I had to
create a new message.

-SNIP-
Why? I don't follow your reasoning? Are you referring to Paul Yaw's data?
If so which chart?

Paul Lamar
Yes, Paul Yaw's data. I used it as a specific injector but the principle
would apply to any other injector. The problem is as follows:
If the injector could operate at a high enough speed, the free-running
oscillator would work fine.When the oscillator and the induction have
the same time period, it works fine. If the oscillator runs at half the
rpm at 50% duty cycle, if the intake were in sync with the oscillator,
you could have all of the fuel go into one induction cycle and none of
it go into the next, or any ratio up to equal distribution
cycle-to-cycle, depending on the phase. The same principle applies to
higher frequencies.

If you graph the output of the injector using 8 ms period out to 40 ms,
then divide it into 10 ms periods (equivalent to 6000rpm) you will see
that the 4 periods have very different fuel flow volumes. The
free-running oscillator can deliver any desired flow over time, but
cannot evenly meter fuel for each combustion cycle.

Additional sensors are not required to synchronize to the crankshaft.
You have to have a sensor to trigger spark. The same sensor can also
trigger the injector. Using the crank trigger solves starting problems,
because you don't have to synchronize powering up the injector circuit
with starter operation.

Victor Roberts


I think you are missing something. In the rotary the intake port never
closes. It matters not if some goes in one induction cycle and some goes in the next. It all goes in. Unlike a 4 cycle piston engine. The rotary
is more of a kin to a continuous combustion engine.


If you go back to a spark trigger the spark plugs fire once per rev
unlike a 4 cycle piston engine so you are right back where I started.

Paul Lamar