N* Injectors?
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Northstar Engines and System Technical Discussion Discussion, N* Injectors? in Cadillac Engine Technical Discussion; Anyone have any functional N* injectors that they would be willing to sell 1 or 2? Can the N* use ...
  1. #1
    N0DIH's Avatar
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    N* Injectors?

    Anyone have any functional N* injectors that they would be willing to sell 1 or 2?

    Can the N* use std injectors like the LT1 and L98?

    Or are they the split spray Z34 injectors?

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: N* Injectors?

    I have 24# injectors in mine. I don't remember if they're off an L98 or LT1, but either will work. N* injectors seem to be prone to clogging and leaking, so I'd recommend just getting a new (not caddy) set off ebay.

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    Re: N* Injectors?

    Do the N*'s not use the split spray?

    What is the stock #/hr for them?

    I have some LT1 and 4.9L injectors laying around.....

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: N* Injectors?

    Northstar injectors have something like 6 orifices, I'm not familiar with the term "split spray". Stock is 23.5#/hr

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    Re: N* Injectors?

    I'll have to scan some picts of it at home, I have some GM docs on it for the Z34 at home.

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    Re: N* Injectors?

    I assume by "split spray", it means the spray is divided into 2 directions, each aimed towards one of the intake ports?

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    Re: N* Injectors?

    Yup. GM's cost reduction to not use dual injectors per port and to not use dual drivers in the PCM, requiring a fancier PCM.

    If you have a FSM, it should show a picture of it.

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    Re: N* Injectors?

    I have a '97 FSM -- I'll try to check it tonight.

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: N* Injectors?

    Quote Originally Posted by N0DIH View Post
    Yup. GM's cost reduction to not use dual injectors per port and to not use dual drivers in the PCM, requiring a fancier PCM.

    If you have a FSM, it should show a picture of it.

    Dual intake valves does not necessitate dual injectors.

    The ONLY engine I have ever heard of using dual injectors was the LT5, and that was done for a specific reason. They effectively shut off half of the intake valves (and injectors) for better low RPM torque and for a torque reduction function.

    The LT5 doesn't even use dual injector drivers. Each injector driver runs two injectors.

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    Re: N* Injectors?

    Then you haven't heard of the 3.4L DOHC, it used them. I am pretty sure the N* used them also. GM's cost reduction.

    What is the stock #/hr of the 96-99 N*? Jason, anything in the FSM on the injector spray pattern?

    I may have to dig up my books and show pictures of it. GM seemed pretty concerned that mechanics would put the wrong injectors in the 3.4L DOHC (this was written before the N* existed in production). The injectors LOOK alike, but spray very different.

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: N* Injectors?

    Quote Originally Posted by N0DIH View Post
    I may have to dig up my books and show pictures of it. GM seemed pretty concerned that mechanics would put the wrong injectors in the 3.4L DOHC (this was written before the N* existed in production). The injectors LOOK alike, but spray very different.
    Please do.

    I've tested northstar injectors and didn't notice anything peculiar about them or their spray pattern. There are plenty of people with 3.4L DOHC's and northstars running non-stock injectors with no problems. (myself included)

    As I understand it, injection events are timed to hit the back of a closed valve so that the heat helps vaporise the fuel. In fact the 3.4L DOHC was batch fire until 1994, which meant all of the injectors were activated at the same time. At best 2 intake ports were open at one time, which meant the other 4 were not.

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    Re: N* Injectors?

    Quote Originally Posted by N0DIH View Post
    Jason, anything in the FSM on the injector spray pattern?
    Yes, and it appears that your supposition that they are "split spray" injectors may be correct, at least for some years, according to my '97 FSM. Regarding the fuel injectors, it states (in part):

    The director plate has holes that control the fuel flow, generating a dual conical spray pattern of finely atomized fuel at the injector outlet. Fuel from the outlet is directed at both intake valves, causing it to become further vaporized before entering the combustion chamber.

    It also provides a relatively poor resolution diagram of a "typical" fuel injector (no information about the spray pattern can be discerned from it).

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    Re: N* Injectors?

    Anyone know the stock size of the injectors? I would guess 24 lb/hr, as the LT1 is 24. And HP is close, the 24's are good up to 300-320 hp with out issues.

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: N* Injectors?

    I already stated 23.5#/hr is stock.

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    Re: N* Injectors?

    Sorry, I missed that, ok, so 24's should be fine.

    I have a few random 19's, might try to troubleshoot. But will probably get the right one, he doesn't want to replace all (my recommendation is to replace all, but this is a beater car, it is a very worn 96 Deville, not a slick daily driver)

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