Shutting fuel off whie driving.

[Mike Brown]

I think this is closer...

800 rpm / 8 cylinders = 100 rpm
100 rpm / 2 cycles = 50 rpm
50 rpm / 60 seconds_per_minute = .833 rps (seconds)
freq = 1/.833 = 1.2 Hz

mike

Frederic Breitwieser wrote:
> 
> > As an "electronocally challeged" participant,
> 
> Being a non-electronically challenged participant, I will add...
> 
> > I'd use a resistor and an led connected to the
> > injector harness.  Not sure of the exact value.
> 
> A generic Radioshack LED with a 1K ohm resistor in series would
> display light when the injector is fired, however even at idle, it
> would be difficult to see it going on and off.  Lets see why.
> 
> Assume a V8.
> On true sequential injection, one injector pulse per intake stroke,
> would result in 50 injector pulses per rotation at an idle of 800
> RPM.  800 rpm / 8 cyls = 100, 100 / 2 (four stroke) = 50.
> 
> At 800 RPM, the led would pulse at or about 50 hz, which your eye
> really cannot see, and would view as constant illumination.
> Flourescent lights actually flicker on and off 60 times a second, and
> the light appears constant to most people, thus illustrating my point.
> 
> > If you have constant LED activity while accellerating,
> > but none during coast-down, you have your answer..
> 
> Often on deceleration, the injector just misses certain cycles, and is
> not closed off entirely, therefore the LED would still be on more
> often than not.
> 
> And oscilloscope would help :)
> 
> --
> 
> Frederic Breitwieser
> Bridgeport CT 06606
> 
> 1993 Supercharged Lincoln Continental
> 1989 HWMMV w/turbocharged 500cid Caddy
> 1975 Dodge D200 Club Cab soon to have 431 stroker + turbos
> 2000 (I hope) Buick GTP (Mid-Engined Sports Car)