12 Hole Injectors-- INFO - JeepForum.com
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post #1 of 29 Old 09-11-2018, 05:36 AM Thread Starter
CobraMarty
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12 Hole Injectors-- INFO

Bosch 12 Hole Injectors-

We use 12 hole injectors on our personal Jeeps.
We had the 4 hole injectors 703 and 784s in our Jeeps and swore by them. We changed them out to these newer 12 hole injectors and now swear by these.

These work great!!
Installed in son's 'daily XJ' '98 170k, now idles smoother, better mileage, better throttle response.
Better mileage and power. Smoother idling, easier starting.
Surprisingly they work much better than the 4 hole 703 or 784 injectors that we have tried.

We immediately noticed easier starting, smoother idle, quicker throttle response, seams more powerful.
My son noticed about a 2mpg gain every day city driving and he doesn't drive with any concern or attempt for mileage.

If you have a set of 4 hole 703 or 784 injectors, IDK if it is worth it to switch them out.
If you have the original 1 hole injectors, it is Most definitely worth it changing to these 12 hole injectors.
Your results may vary but many have noticed the improvements.
Just my 2 cents.

Here is some info I found on line-
Jeep Cherokee XJ 4.0L, Wrangler YJ/TJ 4.0L, Grand Cherokee ZJ/WJ 4.0L
Genuine Bosch EV6 orange color -161 injectors. Not Chinese clones/copies.
Flow Matched to better than OEM standards
Remanufactured using stringent proprietary processes here in USA
Backed with industry leading Unlimited miles LIFETIME warranty
New 'O' rings and pintle caps included
240cc/min 22.9lb/hr at 43.5psi(3bar), 24.4lb/hr at 49psi, +/-3%

Great stock replacement
May be used on stroker engines

Not 1 hole, not 4 hole, but 12 hole injectors
Better atomization of the fuel
Smoother idle, better fuel mileage
Improved throttle response and performance
Will work with '98-down EV1 with adapters and '99+ EV6. No harness cutting.

12 hole injectors (UC) have 50 micron droplet size. Way better atomization.
4 hole injectors (Clll) have 90 micron droplet size.


Typical 12 Hole Injector-




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post #2 of 29 Old 09-11-2018, 10:17 AM
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post #3 of 29 Old 09-11-2018, 01:51 PM Thread Starter
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Bosch -161

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post #4 of 29 Old 09-11-2018, 02:27 PM
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I need to replace the injectors in my 2000 TJ Sport.
Where did you get yours?

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post #5 of 29 Old 09-11-2018, 04:49 PM
batman137
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I'm going to wait for the 48 hole injectors.
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post #6 of 29 Old 09-11-2018, 05:54 PM
Jeepsr4me
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Quote:
Originally Posted by batman137 View Post
I'm going to wait for the 48 hole injectors.
Well I am holding out for the 52 hole and thats 4 better...


I like to know on a long term bases if any of those tiny holes clog up and cause a worse fuel spray pattern than say the 1 hole or 4 hole.
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post #7 of 29 Old 09-11-2018, 07:03 PM
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Without trying to imply that this is total BS, if a simple swap to 24 hole injectors do what you say, why didn't Jeep use these from the factory?

I'm genuinely interested, but skeptical. Fwiw, I changed to Bosch 4 hole injectors on my daily and noticed zero change except for the smoother idle. Some have speculated that the smoother idle is simply fixing one or more vacuum leaks with fresh o rings.

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post #8 of 29 Old 09-11-2018, 11:28 PM
Kiwi_TJ
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Higher Flow Options

Hi CobraMarty,


Can you suggest any higher flow injectors that have the 12 hole nozzle.


Just thinking of injectors that may cope with future forced induction options

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post #9 of 29 Old 09-12-2018, 04:20 AM
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X2...35-36?
Quote:
Originally Posted by Kiwi_TJ View Post
Hi CobraMarty,


Can you suggest any higher flow injectors that have the 12 hole nozzle.


Just thinking of injectors that may cope with future forced induction options
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post #10 of 29 Old 09-12-2018, 08:22 AM Thread Starter
CobraMarty
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Quote:
Originally Posted by jjvw View Post
Without trying to imply that this is total BS, if a simple swap to 24 hole injectors do what you say, why didn't Jeep use these from the factory?

I'm genuinely interested, but skeptical. Fwiw, I changed to Bosch 4 hole injectors on my daily and noticed zero change except for the smoother idle. Some have speculated that the smoother idle is simply fixing one or more vacuum leaks with fresh o rings.
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I don't talk or share BS. I've tried so many things over the years that are total junk. I've wasted tons of money trying and testing different things. Occasionally I find something that actually works and delivers as promised.

I too was skeptical and didn't believe. I too had already replaced my original 1 hole with 4 hole injectors on several jeeps and found only a slight improvement in starting, idling, performance and mileage. Changing from 'pintle' 1 hole to 'disc' 4 hole injectors make them work better, more responsive.

You can see on the chart the year when injectors were developed. In this case the 12 hole were developed in 1999.
The 4 hole in 1996 and Jeep never used those either.

I'm sure Jeep had a few million of the 1 hole injectors laying around that needed to be used. And the 4.0L was a dying engine line up.
There was probably no pressure at the time to change to 4 hole or the 12 hole. Emissions, costs, supply, etc. These are what drives the factory to do what they do, not performance.

So why now? They're cheaper and more available than years ago. There are many used ones in junk yards and injector rebuilders are getting their hands on them. Now a set of rebuilt 4 holes are under $100.
Same for the 12 hole injectors. They are now just over $100 a set.
Time and technology trickle down effect.

4 hole 703 and 784 injectors were quite expensive when they first became available, new and rebuilt. Over the years they have gotten cheaper. Even cheaper than stock 1 hole replacements.

Quote:
Originally Posted by Kiwi_TJ View Post
Hi CobraMarty,
Can you suggest any higher flow injectors that have the 12 hole nozzle.
Just thinking of injectors that may cope with future forced induction options
Quote:
Originally Posted by TJTurbo View Post
X2...35-36?
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I don't know of any but I haven't looked either. A good place to start is any factory supercharged engine pre-DI. Maybe 2004+.

Check out YouTube videos of injector spray patterns. Very impressive.
1 hole is like a nozzle on a hose. 1 stream.
4 hole is like a hose diffuser/wide pattern.
12 hole is like a fog.

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post #11 of 29 Old 09-12-2018, 09:50 AM
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Quote:
Originally Posted by CobraMarty View Post
Bosch 12 Hole Injectors-

We use 12 hole injectors on our personal Jeeps.
We had the 4 hole injectors 703 and 784s in our Jeeps and swore by them. We changed them out to these newer 12 hole injectors and now swear by these.

These work great!!
Installed in son's 'daily XJ' '98 170k, now idles smoother, better mileage, better throttle response.
Better mileage and power. Smoother idling, easier starting.
Surprisingly they work much better than the 4 hole 703 or 784 injectors that we have tried.

We immediately noticed easier starting, smoother idle, quicker throttle response, seams more powerful.
My son noticed about a 2mpg gain every day city driving and he doesn't drive with any concern or attempt for mileage.

If you have a set of 4 hole 703 or 784 injectors, IDK if it is worth it to switch them out.
If you have the original 1 hole injectors, it is Most definitely worth it changing to these 12 hole injectors.
Your results may vary but many have noticed the improvements.
Just my 2 cents.

Great stock replacement
May be used on stroker engines

Not 1 hole, not 4 hole, but 12 hole injectors
Better atomization of the fuel
Smoother idle, better fuel mileage
Improved throttle response and performance
Will work with '98-down EV1 with adapters and '99+ EV6. No harness cutting.

12 hole injectors (UC) have 50 micron droplet size. Way better atomization.
4 hole injectors (Clll) have 90 micron droplet size.

All the repetitive words make this sound like a bad ebay ad, like the tornado gas saver. From my previous research the 1-hole OEM injectors will do just fine
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post #12 of 29 Old 09-12-2018, 10:26 AM Thread Starter
CobraMarty
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Ha, I tried one of those 'tornado' thingys and they didn't work. Ok not really.
But I did use to use biased ply tires and now use radial tires, except for the Pit Bulls.
I don't just research something. I research, buy it, and try it all before I make any objective opinions about it. That's how I roll with most everything in my life.

Again you are taking this the wrong way. There are a billion of 1 hole injectors out there and they work just fine. New models came with 4 hole injectors and work better and even some people tried using these 4 hole injectors in place of their 1 hole injectors. Even later models came from the factory with 12 hole injectors which work even better and some have re-purposed them into older vehicles.

The real question is what is the meaning of 'work just fine', 'better', 'newer'.

I am not recommending that you must go out and change your injectors. I have several jeeps 4.0s, one running 1 hole, one still running 4 hole and 2 switched out from 703/784 to 12 hole injectors.
Did any of the jeeps need new injectors? No. But I am a 'fiddler' and DIY'er and just like messing with things. Yeah it is my hobby.
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post #13 of 29 Old 09-12-2018, 10:41 AM Thread Starter
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A quick check and I found that the Supercharged Mustang and Corvette's used 6 hole injectors. Didn't look for their flow rates, probably about 36lb/hr as that is how much fuel the engine's power requires.

The 12 hole injectors were used more for the 'econobox' cars that were trying to get better mileage and lower emissions. Not necessarily more performance.

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post #14 of 29 Old 09-12-2018, 10:58 AM
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This is interesting.

Are there change years where they switched from 1 hole to 4 hole?

I'm not going to debate MPG as there are so many various factors and it's difficult to get a good data with such a small pool of Jeeps.
For the same price I don't see any concerns replacing with 12 hole and getting better atomization. That said, I'm sure there's a point of depreciating returns on droplet size.
The concern of them getting clogged is very real imho. The standard suggested size filter for fuel injection is 10 micron after the pump. I am unable to find data on what Jeep used in our pumps.

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post #15 of 29 Old 09-12-2018, 05:38 PM Thread Starter
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Jeep never used 4 hole injectors in the 4.0L as far as I know.

Jeep has just the 'sock' in the tank for a filter. The injectors themselves have a filter inside them.

I think injectors get more gummed up with 'varnish' stuff which is why any of the liquid fuel injection cleaners that you pour into the tank can work. I don't know if any one works so I just use them all. Usually start with half a can of Seafoam in tank of gas and run it. Next fill up I use Chevron Tectron for a tankful. Maybe something else sitting on the counter. And lastly a half of bottle of MMO to lubricate everything, fuel pump, level sender, fuel pressure regulator and injectors. Repeat about every 10k or when I remember and I have never had a problem with 'dirty' injectors.

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