> A simple variation of the CIS. Take the CIS injectors and hook them
> right up to a high pressure pump controlled by PWM to controll
> pressure.
>
> Two pumps for redundancy, simple processor control.
>
> Ken Bauman
>
>
> A 555 and a pot to control leaning.

> --
> Paul Lamar ...No rotor no motor.


Ken,

What does CIS stand for?


Doug

Not sure. I've always heard "continuous injection system" as the
injectors don't cycle. They are always spraying fuel. The amount of
fuel delivered depends on the pressure drop across them. Hence
replacing the mechanical regulator system with a pump that is PWM
(pulse width modulated). Varying the amount of pressure out of the
pump would control the amount of fuel delivered. Would not be highly
responsive as the pump would probly have some lag, but as Paul has
mentioned that is not how planes fly.

Lots of pumps today are controlled via PWM in order to eliminate the
return line. I've heard it is for emissions reasons, but it could be
co-opted for fuel injection.

If there was some way to connect a MAP sensor to a 555 to deal with
load/speed variances then a POT to fine tune. Or else a small
processor to do it all. Beyond my skill set. Sky is the limit as far
as how complex it could be. Pressure sensor in the fuel system and the
micro could instantly switch over to the second pump in case of
primary pump failure etc.

Ken Bauman



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