Fuel - Early vs late zetec injectors? | Ford Escort Owners Association (FEOA)

Fuel Early vs late zetec injectors?

Discussion in 'ZX2 1998-2004 2.0L DOHC' started by 1993tracer, Dec 2, 2019.

  1. 1993tracer

    1993tracer FEOA Member

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    I've read in a few places that the later zetec injectors are better. ( Rock auto lists different injectors for the later Zetec) I have a 98 and was wondering what it would take to upgrade them if it is actually an improvement.
    Last edited: Dec 3, 2019
  2. marclar

    marclar Moderator Staff Member

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    i believe the difference is the spray pattern. be advised they may have different connectors.
  3. 1993tracer

    1993tracer FEOA Member

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    I figured different spray patterns... maybe 12 hole instead of 4. Hopefully same spread to properly target the intake valves. I 'll check at some of the other forums too... IE Contour.
  4. 1993tracer

    1993tracer FEOA Member

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    I found this with a google search:

    https://www.feoa.net/threads/fuel-injector-swap.84277/

    If this is correct I have EV1 injectors now and can upgarde to EV6 injectors from 97 up regular escorts or 2000 up zx2s or even mustangs or crown vics.

    I'll have to do some junk yard engineering and report back.
  5. marclar

    marclar Moderator Staff Member

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    right.. the main difference is the pattern. ev1 iirc are one hole, while ev6 are 4. but i cant remember. would have to look into it.
  6. 1993tracer

    1993tracer FEOA Member

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  7. novanutcase

    novanutcase FEOA Member

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    The injector part number you posted is the correct one for your DOHC Zetec motor but why not just go straight to the yellow tops? If they're reporting increased power and mileage why would you want to go with injectors that are only going to keep you where you are now?

    I'm going to go hit up the junkyard once it stops raining here and grab a few sets to test on the wagon. I'll report back once I get a chance to do it.

    John
  8. 1993tracer

    1993tracer FEOA Member

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    The early zetec motors are a different part number than the later zetecs. The injectors on my 98 are probably single hole type I think the later EV-6 are a 4 hole type which would be an considerable upgrade. The early injectors are more like a fire hose, while the later injectors atomize the fuel. The later injectors are likely going to increase the power and mileage over the early injectors.
    I am concerned about the spray pattern being correct for the engine if using injectors off other applications. I know there are some differences on the later heads versus the early heads, but I think they are nearly the same internally. I understand in most engines the spray pattern is directed at the back of the intake valve to help provide cooling for the valve , provide increased atomization and to help ensure no fuel is being washed onto the walls of the port. The spray cone varies in size ( 30 degrees, 20 degrees, etc.) and could be angled when coming out of the injector.
    I 'd want to see what the cone is like on the stock injectors and then find one that fits the same pattern that would be an upgrade. I am bit concerned that if the stock injectors are really rated for only 18.3 lbs /hr @ 80% duty cycle, we are bumping up against thier max flow with only basic bolts ons. If running them at 100% they would be good for 150HP, which is the max I would probably be getting with standard bolt ons. You may get a bit higher with your SR ECM and long tube headers, so you may need higher flow injectors.

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