Injector swap question
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Senior User
Joined: Apr 2010
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From: Troy, NY
Injector swap question
Hey all,
I have come to the conclusion that my oil leak is an injector problem along with the skip that I have. I just have a question for you all before I go tearing into this project. My buddy at work has injectors out of a 97 powerstroke. I'm not sure if they are AA or AB injectors. I know mine are AB split shot with the early 99 powerstroke. How much of a difference would it make to put the AA injectors in? would it be worth it? I'm on a tight budget and this seems like the easiest way to get injectors. I was going to have them flow tested before installing them also. I just was curious if I would improve, suffer, or stay the same with the AA single shot injectors. Also I was looking and saw that the AAs ran 90cc and the ABs ran 130-135cc. Didn't know how much difference that would make either. thanks for the help in advance
I have come to the conclusion that my oil leak is an injector problem along with the skip that I have. I just have a question for you all before I go tearing into this project. My buddy at work has injectors out of a 97 powerstroke. I'm not sure if they are AA or AB injectors. I know mine are AB split shot with the early 99 powerstroke. How much of a difference would it make to put the AA injectors in? would it be worth it? I'm on a tight budget and this seems like the easiest way to get injectors. I was going to have them flow tested before installing them also. I just was curious if I would improve, suffer, or stay the same with the AA single shot injectors. Also I was looking and saw that the AAs ran 90cc and the ABs ran 130-135cc. Didn't know how much difference that would make either. thanks for the help in advance
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
The AA's are going to be single shot...you're gonna need a chip with single shot programing on it for them to operate correctly. They'll run, but you probably won't like it. And you'll have less power...
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Senior User
Joined: Apr 2010
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From: Troy, NY
Thanks for the quick reply. Im hoping he has AB and if not ill just have to order some. and If it comes down to it then the decision is to order the stock replacement or the stage 2 split shots.....hmm....
Lead Driver
Joined: Sep 2005
Posts: 9,399
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From: Norco,CA
I don't know what stage 2 spit shots are? Maybe a larger nozzle? Have yours flow tested and the bad ones replaced. How many miles on them? I would only do the above if money was a real problem, replacing them all at once is the way to go. And if new the truck will really sound good, you won't believe the difference. But if you do do that at least go to the AD injectors, a little more power and no tuning issues.
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Senior User
Joined: Apr 2010
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From: Troy, NY
The stage 2s are just a higher flow injector and yes I believe bigger nozzle and you gain 50hp over stock with no mod or programmer needed. But I have an e99 for the AB injectors. because of the smaller HPOP. I read that the ADs require more oil and the e99 hpop was obsolete because the 17* put out more oil for the AD injectors.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Tight budget and going off the page for injectors are in conflict. Might I offer up the AD injector? The late '99 on up has those.
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Senior User
Joined: Apr 2010
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From: Troy, NY
That's where my question is. I read that the AD injectors use more oil which is why the late 99 and up had the 17* pump and mine only has the 15*. I wasn't sure if the 15* would put out enough oil to fire the ADs
Also if I go with ADs will they support the programmer I have for the truck?
Also if I go with ADs will they support the programmer I have for the truck?
Last edited by jbounds; Feb 21, 2014 at 05:59 AM. Reason: Programmer question added
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Fleet Mechanic
Joined: Mar 2009
Posts: 1,856
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From: Sacramento Delta, CA
Sounds like it would be worth a shot trying AD splitshots with your existing HPOP if someone were to donate a used set:
"FAQ: What’s the difference between a 15-degree and a 17-degree HPOP on the 7.3L?
This question comes up often—mainly because 7.3L owners have been told the 17-degree high-pressure oil pump is better. The terms 15-degree and 17-degree come from the angle of the swashplate. The longer the stroke of the swashplate, the bigger the displacement—and the more oil volume it puts out. The ’94½ to ’97 and early ’99 engines all came with the smaller displacement, 15-degree pump. In an effort to keep up with the higher oil demands of split shot injectors on ’99½ to ’03 engines, the larger-displacement 17-degree pumps were used.
Although the swashplate angle can vary from pump to pump—and very seldom is a later pump actually a 17-degree unit or an early pump a 15-degree unit—these terms have stuck as an easy way to describe an early vs. late-model pump. All HPOPs are interchangeable, so a higher-volume, 17-degree pump will bolt right up to an early 7.3L’s front cover and drive gear."
From:
HEUI - How High-Pressure Oil Injection Systems Work - Diesel Power Magazine
Wouldn't the 15* vs 17* HPOP difference only be noticable at Wide Open Trottle anyway?
"FAQ: What’s the difference between a 15-degree and a 17-degree HPOP on the 7.3L?
This question comes up often—mainly because 7.3L owners have been told the 17-degree high-pressure oil pump is better. The terms 15-degree and 17-degree come from the angle of the swashplate. The longer the stroke of the swashplate, the bigger the displacement—and the more oil volume it puts out. The ’94½ to ’97 and early ’99 engines all came with the smaller displacement, 15-degree pump. In an effort to keep up with the higher oil demands of split shot injectors on ’99½ to ’03 engines, the larger-displacement 17-degree pumps were used.
Although the swashplate angle can vary from pump to pump—and very seldom is a later pump actually a 17-degree unit or an early pump a 15-degree unit—these terms have stuck as an easy way to describe an early vs. late-model pump. All HPOPs are interchangeable, so a higher-volume, 17-degree pump will bolt right up to an early 7.3L’s front cover and drive gear."
From:
HEUI - How High-Pressure Oil Injection Systems Work - Diesel Power Magazine
Wouldn't the 15* vs 17* HPOP difference only be noticable at Wide Open Trottle anyway?
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
Likely. In that vein, I'm not suggesting the AD as the best solution... I offer it as an alternative for stage II anything. The capacity of the injector isn't the real killer of ICP, it's how much of that capacity you use that's the sinker. A stock nozzle automatically keeps this in check (to a degree), but a bigger nozzle (like on a stage II) will likely overtax the HPOP without tuning. The reason behind this is multi-faceted, and I haven't written that novella yet.
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
You will be fine with the 15 pump. I say this but I have and e99 also and even with AB injectors at freeway speed you will feel the difference right away with a T500 pump. You will also gain MPG, that's right I said MPG. I've live'd it and know from personal
experience. I gained 1.9 mpg at 75mph with this mod only! So if your just going new injectors don't buy AB, go to the AD or single shots. No programing required, but will be required with single shots. Stage one single shots, stock nozzles will use less HPO to run, every buddy here has stated this already, but you need programing to run them correctly.
experience. I gained 1.9 mpg at 75mph with this mod only! So if your just going new injectors don't buy AB, go to the AD or single shots. No programing required, but will be required with single shots. Stage one single shots, stock nozzles will use less HPO to run, every buddy here has stated this already, but you need programing to run them correctly.
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Senior User
Joined: Apr 2010
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From: Troy, NY
Sounds good everyone that's why I love this site sooooooo much knowledge with these trucks. And that will be what I do if I end up buying new is I will go with the AD injectors. If I go with those and I put them in I should be able to have my programmer set up to run the ADs a little better right? Or am I mistaken
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Sounds good everyone that's why I love this site sooooooo much knowledge with these trucks. And that will be what I do if I end up buying new is I will go with the AD injectors. If I go with those and I put them in I should be able to have my programmer set up to run the ADs a little better right? Or am I mistaken
Since you're on a tight budget, it might be wise for you to just focus on making the truck as close to 100% as possible without modding up. You'd be impressed with what these truck were able to do when they were new, but age has diminished the performance and economy on so many 7.3Ls. There's rarely anything wrong with the engine, it's just all the support stuff stuck to the engine that's fading out.
There is a link in my signature under the heading "Custom Tunes". Click that, and it's explained a little better there.
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Senior User
Joined: Apr 2010
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From: Troy, NY
Thanks tugly and I plan on making it 100% before putting the programmer back on it want to be sure she is sound before putting more go in her I just wanted to be sure on what injectors to put in so I won't have to worry about it later on. Do you or anyone have a write up in injector replacement so I don't F it up? Thanks again for your help
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BigfootIDI
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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Apr 10, 2010 03:19 AM