Fueling & Injection - Homegrown fuel injector flow check

Has anyone ever thought of making their own fuel injector flow tester?

I don't think it would be all that hard. Either Clear 3" or 4" pvc pipe or glass jars could used to catch/view the spray pattern. A simple top and fuel rail could be contructed very easily. My only questions would be:

1. What are the minimum pressure and flow ratings for the pump to be used? I guess that the stock pressure should be used as that is how they would spray when installed on an LS1.

2. A simple 555 IC and Fets (for current draw) could supply the 12VDC to the solenoids. What kind of signal should be sent and at what duty cycle? 12 ms square wave running 50% duty cycle?

If I amreinventing the wheel, please let me know.

Thanks :)

Dave

You might want to check out this thread....

http://www.turbobuicks.com/forums/showthread.php?s=&threadid=20689

I consider this person, gnjones231, to be an authority on fuel injectors and how to drive them. You may want to contact him and see what he has to say on the subject.

Paul

I built one of my own. I used a Ford fuel pump
& the regulator part of a Ford fuel rail (off a
MkVII) as that was the job at hand. I used
two 555s - one with a roughly 10mS pulswidth
(if I remember right) at 4Hz frequency astable,
to run the driver and one with about a 5sec
monostable output to gate it, creating a series
of pulses. I used a 2N2222 / TIP48 Darlington
arrangement common-emitter sink driver as the
555 is pretty weak, and most power MOSFETs
back in the day were expensive and very ESD
susceptible.

The analog scheme I used has a bit of warm-up
and test-test variability to it and I would do it
differently (crystal oscillator / counter, digital
pulse-train control) if I were to be bothered.
The way I deal with the variability is by test
repetition and looking for stabilization of test
results (warmup).

I built mine into a hard-shell equipment
"suitcase".