number 8 injector has different part number
 

I was looking at prices for 99-03 injectors and noticed several companies have a part number for 1-7 cylinders and one for number 8.
What is that all about and what happens if you put a 1-7 in the 8 hole? I ask because I replaced number 8 a week ago and now my truck is pushing oil into the fuel rail. I plan to pull them all for calibration and cleaning. replace as needed and go back in with new o-rings. I will ask the techs at the injector shop too.
Just wondering if anyone here had heard of this before.

As for the oil in fuel sounds like the Injector Orings.

Number 8 had a TSB for the noise being a dead headed fuel system, they installed an AE code injector in #8 which is also called a long lead injectors as it is mechanically tuned to deliver a longer lead time to allow for less cackle. Technically you can run either, I run AD's which are 1-7's. But I also have a Fuel Rail Crossover to eliminate the dead head issues.

Here is a great place to get some injector's if you are in the market, Clay has New Alliants as well if that's what you are into.

Riffraff Diesel Performance Parts: Diesel fuel injectors | Ford Powerstroke fuel injectors | 7.3L Fuel Injector - Full Force Diesel / Casserly

If you wanted to test them

Riffraff Diesel: HEUI Flow Testing

Then even some of that can be recouped if you go with injectors there too.

Thanks for that info. I am new to powerstroke diagnosis and repair. I have owned 3 before this one but this one is my "new toy" so I'm doing the repairs and upgrades myself.
Did you build your own crossover or just pick one up from a vendor?

I did mine myself, using materials and the idea very similar to Clay's offering, which I believe was Kwikordead's original setup, but if I needed another one, no hesitation getting Clay's Frx, I think it's cheaper than the time and money I spent building mine.

Riffraff Diesel: Fuel Rail Crossover™

Alan,
Are you sure the AE is mechanically different inside? I always assumed just the solenoid was different and "long lead" referred to a delay built into the solenoid so the SOI was a tiny bit later than called for. :-huh

I've taken apart AD and AE side by side and they looked identical inside....but I didn't measure the parts with a micrometer so perhaps there are microscopic differences?

it is the solonoid that is different.

I shouldn't have used that wording mechanically, I suppose, thanks for the correction.

I'd rather use the Strictly Diesel unit which is nicer and has a fuel pressure regulator instead of springs. That or Diesel Innovations.

No biggie. :)
I was just wondering because I have always wondered myself. I have looked around and never found a definitive answer. I was sorta hoping that you might know of a link to an article that talks about the AE with more detail.

Alan
I thought I'd follow up on this conversation. You are correct. The AE injector is mechanically different (according to Jim at Rosewood). I asked him and he said the AE has a slightly shorter intensifier piston which causes the injector to begin it's prime shot a tiny bit sooner than an AD injector would. He said it's such a small difference that he has his doubts that it solves any issues at all but Ford thought it was worthwhile so that's why they did it.

I believe machining down the intensifier piston is one of the ways these injectors can be modified to increase the amount of fuel they provide. So, if the AE has a slightly shorter intensifier piston, then it also might deliver slightly more fuel (although the difference would be very very small). :-huh

I'll see if I can find some more info. :-X22

is this true for the 97's as well? and if I run a standard injector will it hurt the motor at all? or will i need to run the crossover in order to run the standard injector?

No the OBS pickups have a different fuel feed system and never had the cackle problem. The LL injectors didn't come about until about 2001.