Dana;
No, it doesn't matter. The injector is operated by a solenoid winding inside
the injector body. When current is run through it, it generates a magnetic
field and that pulls up the pintle, letting fuel spray from the injector
tip. A 'Fuel injector" is actually a spray nozzle with a high-speed on/off
valve built in.
The only way the polarity would matter is if the pintle were a polarized
permanent magnet or if the injector included a clamp diode across its
solenoid winding. I haven't run across either case. One of these days,
someone may realize that if the pintle were made as a polarized permanent
magnet, it could be closed by reversing the current through the solenoid
rather than relying on spring pressure alone. I think a higher RPM injector
could be built this way.
Regards, Neil Tucson, AZ
-----Original Message-----
From: Dana [mailto:dana@goulston.net]
Sent: Tuesday, April 15, 2003 5:20 PM
To: Land Speed
Subject: Injectors
Here's a question for all who are running fuel injection.
I can't figure out the polarity on the two leads that energize the injector.
I hook up a 12v source and try both ways. Either direction will energize the
solenoid and lift the pintel.
Does it matter ????
Thanks,
Dana
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