Injector Swap Writeup for the 4.0L - Page 7 - JeepForum.com

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post #91 of 180 Old 10-02-2012, 12:59 PM Thread Starter
dukie564
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no not worth it. People on here or cherokeeforum sell them for like $80 for 6 rebuilt, cleaned, and tested.


1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 309,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/p...rt-xj-1297118/
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post #92 of 180 Old 10-02-2012, 02:15 PM
AmbuGrl
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Hellz no would I pay what you saw on ebay. I paid $70 shipped for mine.

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post #93 of 180 Old 10-02-2012, 09:20 PM
64tbird
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Where can you get them cleaned and tested/flow tested?
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post #94 of 180 Old 10-02-2012, 11:22 PM
GetLifted
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I got mine cleaned rebuilt and flow matched for 90 shipped with a warranty from ebay seller injectordyne
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post #95 of 180 Old 10-10-2012, 10:04 PM
RedRyderXJ
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Got mine for $45 from x91j when he did it on CF
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post #96 of 180 Old 11-24-2012, 10:55 AM
Lubetich
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Got mine from the jy, $28 for all 6! Is it normal for a little bit of white smoke to come from the injector area at first? Is that the "Running Rich" You speak of?
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post #97 of 180 Old 11-24-2012, 02:57 PM
bigbadduck
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Really cool write up
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post #98 of 180 Old 02-19-2013, 08:13 AM
jmiera
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great write up !!
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post #99 of 180 Old 02-19-2013, 08:43 AM
robinz
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Quote:
Originally Posted by 64tbird View Post
Did you need resistors to run the 3.7l injectors? And which wire to which wire when you rewired to run them? I got a set from a 02 and they have been soaking in seafoam for months lol. I forgot about them
Sorry about this late response, I was never notified. No resistors required and wire-to-wire does not matter.

1990 XJ 4.0L I6
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post #100 of 180 Old 04-06-2013, 04:22 PM
DunmerBoy
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awesome job with this write up! i did it this morning and couldnt have nearly as easily without it

“The mountains are calling and I must go.” ― John Muir
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post #101 of 180 Old 04-08-2013, 12:30 PM Thread Starter
dukie564
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Glad I could help!

1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 309,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/p...rt-xj-1297118/
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post #102 of 180 Old 04-14-2013, 05:13 AM
jeep795
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looking at a few of the injector sites, not every injector has the flow rates listed and at what pressure. I always hear to use the ford blue tops, or the four hole siemens... Now neon and libby injectors?? Hard to chose. Is there a list, in order of flow rate/pressure showing the injectors that will fit on a 4.0 rail and what modifications might have to fit for optimum performance on both a single rail and double/return.

some of the links don't show what the original intention was any more. Any chance some of those could be updated? And ya know, I'd really like to hear from some of the stroker guys about what injectors they've used and had success with.
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post #103 of 180 Old 04-15-2013, 08:51 AM Thread Starter
dukie564
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not sure what links are broken - I just checked and all mine look fine. There is no "list" beyond the image I posted on the first page showing application by year.

Anyways here's a few links for reading up and to give more information:
http://www.ausjeepoffroad.com/forum/...ad.php?t=92236
http://www.cherokeeforum.com/f2/more...48/#post173704
http://www.fuelinjector.citymaker.co...low_Rates.html
Converter: http://www.witchhunter.com/injectorcalc1.php


For Reference:
The stock injectors for Renix flow 240cc, HO flow 248cc (up to 95-OBD1) and 234cc (96- up OBDII). However, the Renix and OBDI flow at 39PSI and the later OBDII ('96 onwards) flow at 49PSI.

Injector flow is always measured at 3 Bar, 43.5PSI. This is a reference point and from this you can calculate the flow to your system working pressure.

Injector size (lb/hr) = (horsepower x 0.5)/(no.of cylinders x 0.8 )
So say you have a 250 horse I6...
125/4.8=26 lb/hr injector
So for a 30 lb/hr injector, you would need about a 290 horse motor to utilize them.
Cherokees from 93 on made around 190hp stock= 19.8 lb injectors according to the above formula
The 24lb injectors should be good for some 230hp.

1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 309,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/p...rt-xj-1297118/
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post #104 of 180 Old 04-16-2013, 01:17 AM
Project1
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Quote:
Originally Posted by dukie564 View Post
Step 15 - Time to lube up! Grab your petroleum jelly, and lube up each o-ring, being careful to keep it away from the pintle holes.
Petroleum based lubes may erode the rubber o-rings and harden them, causing cracks or break apart.

silicone is a better bet really.

[ ]||||||[ ] ... http://www.jeepforum.com/forum/f11/98-green-xj-daily-driver-build-996260/
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post #105 of 180 Old 04-16-2013, 06:35 AM Thread Starter
dukie564
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meh...2 years and zero issues. With the really small amount I used i'm not worried in the least.

1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 309,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/p...rt-xj-1297118/
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