hodge Posted June 23, 2011 Share Posted June 23, 2011 Hi guys Am I right in thinking when I wire my new injectors in the wires car go to either way around on the plug. Thanks John Link to comment Share on other sites More sharing options...
dandan Posted June 23, 2011 Share Posted June 23, 2011 I believe so. Link to comment Share on other sites More sharing options...
Ian C Posted June 23, 2011 Share Posted June 23, 2011 Hmmm. Injectors work using a electromagnetic coil. Unless I'm mistaken in how these things work (which I might be), if you wire it up the wrong way round it'll just try to shut even more by pushing the pintle the wrong direction. Link to comment Share on other sites More sharing options...
bignum Posted June 23, 2011 Share Posted June 23, 2011 (edited) I tried mine on a battery, worked either way, i think bosch are the only manufacterer to mark the +, something to do with back emf leakage through an in built diode.Just wire them uniformly. Edited June 23, 2011 by bignum (see edit history) Link to comment Share on other sites More sharing options...
Ian C Posted June 23, 2011 Share Posted June 23, 2011 By "worked either way" do you mean it delivered the same amount of fuel? Or it still made a "click" noise? Considering how easy it is to wire it up the same way as OEM, I can't see any reason why you wouldn't. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted June 23, 2011 Share Posted June 23, 2011 Pretty sure that polarity is not important, due to them being a solenoid type valve, and they are spring loaded so can only open when the coil is energized, and not polarity dependant like a motor. Link to comment Share on other sites More sharing options...
Ian C Posted June 24, 2011 Share Posted June 24, 2011 What I don't get, if polarity isn't important, is how the injector pintle knows which way to go when the solenoid is energised? I've been googling it but nothing I've found has said one way or the other yet. (I'm on nightshift, can you tell ) Link to comment Share on other sites More sharing options...
Ian C Posted June 24, 2011 Share Posted June 24, 2011 THese guys say it doesn't matter: http://www.eng-tips.com/viewthread.cfm?qid=151178&page=5 Megasquirt allegedly say it does: http://www.peachparts.com/shopforum/showpost.php?p=2507885&postcount=6 *gives up* Link to comment Share on other sites More sharing options...
Lee P Posted June 24, 2011 Share Posted June 24, 2011 It doesn't matter but I always make sure I get them all the same, it's obvious which way they are on the loom but some of the injector fly leads have 2 black wires. I look at the stock injector and go by that. Link to comment Share on other sites More sharing options...
dandan Posted June 24, 2011 Share Posted June 24, 2011 Apparently I used to know more than I do now.....but at least the advice was the same: http://www.mkivsupra.net/vbb/showthread.php?94368-Fuel-injector-adaptor&p=1192164&viewfull=1#post1192164 Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 24, 2011 Share Posted June 24, 2011 What I don't get, if polarity isn't important, is how the injector pintle knows which way to go when the solenoid is energised? I've been googling it but nothing I've found has said one way or the other yet. (I'm on nightshift, can you tell ) It would only matter if the solenoid was pulling a magnetized plunger. The plunger has no magnetic polarity save anything it gains latently. Bosch mark their injectors with + and - as some high end ecus do use the back emf to do something with. The Zytek ecu on my Mugen V8 race engine uses this, they call it recirculation. I do have an SAE paper written about this somewhere, but I can't find it. From memory it helps them close faster. Link to comment Share on other sites More sharing options...
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