DIY injector build

[Arisley]

DIY heui injectors is about the worst thing you could do to your truck. By the time you buy parts and pay to send them to be bench tested you will have as much or more than you can buy a set. And if you think you will skip the flow testing then you need to sell the truck and move along. I have seen a trend come into the 7.3 market in the last year and it's not a good one. Don't take this personally but being cheap and owning a diesel are not two things that lead to a happy ending.

I am all about DIY.

I would still listen to this guy.

Everybody thinks that since they stopped building this engine 13 years ago, it has to be old simple technology. There are no secrets to it. It can be done. You make a mistake, you toast a motor. Ten years ago, you could find a good running 7.3 for 400 bucks. Not so much today. They are starting to get harder to find, and people are proud of them.

 

[Tim @ P.I.S.]

Here is the kicker. Even when you use all new parts, measure every component to .001" and really make everything just perfect when putting them together sometimes they just don't work for squat.

It happens. And without a way to test them in every imaginable scenario it's not worth the possible damages in my eyes. Save maybe a few hundred dollars but hydrolock an engine to the tune of a few thousand dollars?

 

[Arisley]

Correct me if I am wrong Tim. Do you build injectors set by set, or do you match them set by set.

Like, this one is good, and this one is good, Both built to the same specs, but they work different. I have a pile of good built injectors, now I am going to match up as many sets as I can?

Not busting balls at all, I know when I buy my next set of injectors, they will be yours. But the way I it was explained to me once was something like that.

 

[mandkole]

When I got into diesels 15 yrs ago, the 7.3 performance stuff was starting to get good. Some were still blowing them up on propane but everyone was learning about injector mods. The DIY injector deal started to become a thing about 10 yrs ago and I tried it,--spent a lot of time on them and two different afternoons in the local diesel injection shop with a flow bench. The shop owner humored me for being the first local guy he knew of who actually tore a set down. He quizzed me on where I got the orings, machined pistons, etc, educated me on properly torqueing the halves together, showed me how the flow bench worked, etc. Like all parts in a heui, its a big deal if you don't know the tricks.

The set flowed within 2 ccs (156-158cc) at high rpm/ICP, but could not get them much closer than 1.5 from each other at idle... that's an issue. The set ran a little smoother, but still had basically the same chunky idle prior to the build. My first trucks motor was not well maintained and the oil sides were pretty blown out. That armature gap was tough to get right with no spares, machine tools, etc.

What the hell, give em a shot.

 

[old man dave]

Here's a place for the stock small stuff:

http://www.mylexinternational.com/powerstroke.htm

 

[Tim @ P.I.S.]

Correct me if I am wrong Tim. Do you build injectors set by set, or do you match them set by set.

Like, this one is good, and this one is good, Both built to the same specs, but they work different. I have a pile of good built injectors, now I am going to match up as many sets as I can?

Not busting balls at all, I know when I buy my next set of injectors, they will be yours. But the way I it was explained to me once was something like that.

We look forward to your order.

About your question, I personally like to keep core sets together. We often find that if a set was kept together for 100-300 miles the wear on the oil side a lot of times is fairly even. There are times when sets are not complete and/or issues arise with a single injector. But for the most part we try to keeps sets together. I hope that answers your question.

 

[Tim @ P.I.S.]

For anyone that wants to attempt this as a project themselves feel free to give it a shot. But please don't do it for the simple fact you think you can do it cheaper than purchasing a set as it will not likely work out in the end as you had hoped. But for those that want/need parts we gladly sell parts and always offer flow bench testing. Give us a call if that's an avenue you want to take. We however do not offer tech support for this type of project, you essentially are on your own.

 

[Arisley]

That's about as up front as you can get.
Yes, it did answer my question Tim. Thanks.

 

[ja_cain]

For anyone that wants to attempt this as a project themselves feel free to give it a shot. But please don't do it for the simple fact you think you can do it cheaper than purchasing a set as it will not likely work out in the end as you had hoped. But for those that want/need parts we gladly sell parts and always offer flow bench testing. Give us a call if that's an avenue you want to take. We however do not offer tech support for this type of project, you essentially are on your own.

Tim, how much to flow a set? Thanks!

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[N2GN2]

Really good reading here http://www.powerstrokenation.com/forums/14-7-3l-power-stroke-aftermarket-performance/17565-how-pcm-idm-work.html?showall=1

 

[N2GN2]

I'm building the wife injectors. I'll be making hybrids with a 7.1mm P&B and a 16mm piston. I'll retain the stock nozzles as she is stock for now. BTW, I run my truck on straight vegetable oil!

 

[m j]

the mechanical parts of a flow bench sound pretty easy for a ********.
a head, a hydraulic pump, a fuel pump, graduated cylinders to catch the fuel

need an electronics guy to make a DC voltage supply that can feed 1000 hits at a controlled variable pw

what did I miss?

 

[N2GN2]

I wonder if a 12vDC square wave function generator would be enough to simulate the FDCS to the IDM and get it fire off the injectors. I'm thinking around a 500 Hz signal at 50% duty cycle. I interpreted this from Swamps oscilloscope.

 

[m j]

do you need the idm?

 

[N2GN2]

Seems a much cheaper route then buying a 120vDC power supply.

 

[Tim @ P.I.S.]

Tim, how much to flow a set? Thanks!

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Our typical charges are $200 to test and @250 if you want new orings included. We would be happy to offer to fellow "ARMY" members the testing service for $150.

And if you are buying used injectors it is really the smart thing to do.

 

[DZL JIM]

DIY heui injectors is about the worst thing you could do to your truck. By the time you buy parts and pay to send them to be bench tested you will have as much or more than you can buy a set. And if you think you will skip the flow testing then you need to sell the truck and move along. I have seen a trend come into the 7.3 market in the last year and it's not a good one. Don't take this personally but being cheap and owning a diesel are not two things that lead to a happy ending.

Pretty much sums it up right there. I can't think of a better way to put it.

However, unlike Tim I refuse to sell injector parts (for over 5 years now) as I simply do not want to promote working on these in a DIY fashion.
And we do not flow test any injector that we do not build. To me it's a waste of money and our time as there are usually a bunch of reason why an injector flows poorly and yet the flow test doesn't tell you why. Just that there's a problem, which you probably already knew there was or you wouldn't have had them tested in the first place.

 

[dsberman94]

ive had a set rebuilt by jim @ rosewood, and ive bought a bigger set from Tim@PIS, and i know i will never even attempt to build a set of these injectors on my own.

 

[ja_cain]

Our typical charges are $200 to test and @250 if you want new orings included. We would be happy to offer to fellow "ARMY" members the testing service for $150.

And if you are buying used injectors it is really the smart thing to do.

Thanks for the info Tim!

 

[ja_cain]

I wonder if a 12vDC square wave function generator would be enough to simulate the FDCS to the IDM and get it fire off the injectors. I'm thinking around a 500 Hz signal at 50% duty cycle. I interpreted this from Swamps oscilloscope.

Did someone say square waves and high voltage power supplies. I've got a few of these laying around. Lol! Just need to find out how much horsepower it takes to run the hpop.

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