testing injectors

[Bruce Plecan]

Well,  they say injectors will overheat and die from being on without fuel
running thru them.  I've had some on for 45 mins straight, and the seem to
operate fine.
They still react to times a low as 1.6 msecs, so I don't see the problem.
These were saturated in this test.   Also, have run then on the bench at 55
MPH in my 92 camaro for hours, and no smoke, still respond to short on
times.
   I've run a Cold primer circuit using a IRF 511 and a 12 ohm resistor for
years,
for a primer.  This was TBI.
   There was a comment about the injector doing a piss, and dribble as it
turns on and off, so that will screw up, any real max flow sampling.   But
just doing the
short duty cycle would be no good for that, so if I was gettin really
serious I think I'd do both a 20% duty cycle test, and a 100%.
   I've seen some notes on how erratic a large P+H is at less than 2 msec.,
so I'd watch that real close.    When running those.
   Yes to using a battery, and a proper fuse.  Well ventilated area, yada
yada, do everything in a safe manner, since most anything can be made
expolsive.
   I'd also, get real critical about timing, ie solid state switching, no
"by Hand stopwatch stuff"
Just my 02
Bashful

> I know this is a
> bad situation but for purposes of testing is this going to damage the
> injector (I don't need to measure for the whole minute, I could use 15-30
> seconds if that makes a difference).
> Will this work for peak and hold injectors?  If these injectors need 4
> amps to open then I'm going to need something like a car battery to open
> the injector.  Is using a car battery a bad idea here?  i.e 12V vs. 9V

> I have some professionally cleaned and flow tested injectors that I can
> use as a refrence and I'll use methanol or paint thinner as the solvent
> or hexane (I'm a biochemist so I can get anything) ya hexane sounds good
> as it's not too volatile, methanol would be cheaper and easier however.
> Need some thought here.

> I know someone posted a simple circuit to based on a 555 timer but I'd
> like to do this quick.  However if this is the only non destructive
> method then I will build that guizmo.
> Any and all ideas welcome as usual.
 jw