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----- Original Message -----
From: "Marvin Kaye" <marv@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, March 05, 2004 6:06 PM
Subject: [FlyRotary] Re: It Runs !!!
> Posted for "sqpilot@earthlink" <sqpilot@earthlink.net>:
>
> Yes, Ed....my injectors are also fired by grounding. Don't know if it goes
> through a resistor. Just read the manual that says the injectors are fired
> by grounding to earth, and that the wiring is not polarity dependent, ie
> either wire can go to either terminal on the injector. Unfortunately, I
am
> electrically challenged. (I can, however turn on a lightswitch and operate
a
> radio and a television). Regarding the ohm check....should this be done
with
> the ignition on or off, or should it be done with the engine running? I
was
> thinking that if I disconnect the fuel pump wire so that the engine cannor
> start, possibly turning it over and listening to the injectors would tell
me
> if they are clicking? Or might this be too diffucult to hear? Thanks for
> any and all suggestions on how to check this out. Paul Conner
>
>
Yes, as long as one of the wires to the injector goes to a power source and
the other wire goes to a grounding source (your EFI), the injector does not
care which wire it is. BUT, when the EFI is off or the engine not running,
normally neither of the two wires going to each injector should show a
ground.
You might hear the injectors clicking, but I doubt it over then noise of the
engine cranking.
If you have or can borrow an ohm meter. Set it to its lowest resistance
scale or if it has a "continuity checker" mode - most of the time it signals
a direction connection with a "beep". Ground one of the ohm meter's probes
and after unplugging an injector harness (try the one that's leaking), make
contact with each one of the two terminals with the other ohm meter probe.
If you get a "beep" or a low ohm reading <10 ohms from either of the two
terminals then that terminal is grounded and you need to find out why.
Ed Anderson
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