V. E. Welch wrote:

Just a brief question for some of you in the know.  I have been doing some
reading on multiport electronic fuel injection.  I can understand how the
various parameters, rpm, throttle position, air temp, etc. are used to
calculate pulse width (basically duty cycle).  However, I don't see any
input that would let the system know that the intake valve for a given
injector is open; that being the case, am I correct in assuming that the
injector fires irrespective of valve position?  Is it possible under some
circumstances for the injector to open on a closed valve?  Or is there
something that I am missing here?

Vince

There is a device on piston engines called a cam shaft position sensor
which feeds data to the computer. On the rotary all it needs to know
is TDC for one of the rotors or some other reference as to the
position of the eccentric shaft. The computer then knows the exact
instant when to fire the injector.

Paul Lamar
 
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