Shutting fuel off whie driving.

[Barry Tisdale]

Factor of 60 missing?  Where's the Hz (seconds) to RPM (minute) divisor?

At 10:32 AM 3/31/99 -0500, you 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)
>
>
>