12 hole injectors - JeepForum.com
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post #1 of 23 Old 06-07-2019, 11:20 PM Thread Starter
GAragecouple
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12 hole injectors

Any thoughts on swapping out original injectors for the 12 hole ones?



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post #2 of 23 Old 06-08-2019, 05:38 AM
biffgnar
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There are some extensive threads on injector swaps that you should be able to find and read. IMO at best you may get a little smoother running engine (and that may be placebo effect), but will be no change to power, mileage, etc.
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post #3 of 23 Old 06-08-2019, 06:40 AM
jtec
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If it ain't broke .......

Agree with above statement- anecdotal at best.
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post #4 of 23 Old 06-08-2019, 08:48 AM
Jerry Bransford
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There's no real significant benefit to doing that swap, I wouldn't waste my $$$ to do that.
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post #5 of 23 Old 06-08-2019, 09:54 AM
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If you already need to swap your injectors (broken, clogged, whatever), then it can't hurt to try them if there isn't much cost difference. Just keep in mind that any performance improvement is probably due to the fact that you needed to swap your injectors.
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post #6 of 23 Old 06-08-2019, 08:44 PM
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I just did mine today and bought 6x refurbished ones on ebay Bosch. 2002 Jeep wrangler sport 4.0l 166k was a dog and slow as ****. I have 31in tires, 3in lift, basket and gas tanks. So i also pulled the oem airbox snorkel off and is breathing much better. She has more power and its a big notices from stock. With extra weight in the back im also running air lift 1000. She is all leveled now too.
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post #7 of 23 Old 06-09-2019, 06:34 AM
biffgnar
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Have you ever heard of confirmation bias?
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post #8 of 23 Old 06-09-2019, 11:23 AM
Kaptainkid1
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Wouldn't the larger opening in the airbox help with power.
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post #9 of 23 Old 06-09-2019, 11:54 AM
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Not if it wasn't a bottleneck to begin with. Also the shape of that airhorn promotes airflow.
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post #10 of 23 Old 06-09-2019, 12:25 PM
biffgnar
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Isn't it Venturri effect or something like that? And the internal flow restrictions within the 4.0 are the limiting factor.
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post #11 of 23 Old 06-09-2019, 02:52 PM
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Quote:
Originally Posted by Kaptainkid1 View Post
Wouldn't the larger opening in the airbox help with power.
No. That 'trumpet' plugged into the air box is there to speed the airflow into the engine which reduces engine noise and help with combustion. Even with the trumpet in place the engine still easily gets more air flow through the air intake system than it can possibly consume at WOT and redline rpms. Leave the trumpet in place, it does not reduce performance in the least.
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post #12 of 23 Old 06-11-2019, 04:54 PM
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You know, I just sent in and had the injectors from my turbo'd 91 Celica with 180k miles cleaned and tested by WitchHunter, vs buying replacements.

Test results show they were still flowing perfectly before cleaning. Did come back shiny though.

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post #13 of 23 Old 06-11-2019, 07:16 PM
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Quote:
Originally Posted by WeezyBlue View Post
You know, I just sent in and had the injectors from my turbo'd 91 Celica with 180k miles cleaned and tested by WitchHunter, vs buying replacements.

Test results show they were still flowing perfectly before cleaning. Did come back shiny though.
You can thank modern gasoline formulations chock full of cleaners for that. Clogged/dirty fuel injectors have been rare since then.

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post #14 of 23 Old 06-11-2019, 08:17 PM
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Correct me if I am wrong, and I probably am, I don't think running a multiple hole fuel injector without any additional filtration is a great idea since it would be easier to clog. Not sure if there is any other fuel filter besides the one on the fuel pump pickup and I don't know what its micron rating is.
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post #15 of 23 Old 06-11-2019, 10:45 PM Thread Starter
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Quote:
Originally Posted by Kalten View Post
Correct me if I am wrong, and I probably am, I don't think running a multiple hole fuel injector without any additional filtration is a great idea since it would be easier to clog. Not sure if there is any other fuel filter besides the one on the fuel pump pickup and I don't know what its micron rating is.
That's a good question. I'm guessing what would clog the 12 hole would also clog the 1 hole. Hmm
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