Fuel Injector polarity
Fuel Injector polarity
(OP)
I see that most all MPI fuel injectors have a "+" polarity marking on them.
We have measured the injector "on times" using an accelerometer and don't see any difference in operating times with either polarity.
I'm sure it is there for a reason.... Who can enlighten me?
We have measured the injector "on times" using an accelerometer and don't see any difference in operating times with either polarity.
I'm sure it is there for a reason.... Who can enlighten me?





RE: Fuel Injector polarity
RE: Fuel Injector polarity
There is a significant back EMF when the magnetic field collapses but this is absorbed by either an RC or (more commonly) zener circuit in the ECU. The breakdown voltage of the insulation is typically more than an order of magnitude higher than the back EMF voltage.
Siemens, Delphi, ourselves and many others do not indicate polarity.
RE: Fuel Injector polarity
RE: Fuel Injector polarity