common rail 7.3 conversion kit?!? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 181 (permalink) Old 09-27-2008, 07:34 PM Thread Starter
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common rail 7.3 conversion kit?!?

Come on guys, I know it's been done. I know it can be done for a non insane price. Just exactly what would it take to make it happen? I say an easy 5 G's could get everything we need for the basic fuel system conversion components. We're only talking about 7.3 injector blanks, new injectors for the blanks, fuel lines & rail, cp3, mounting brackets, and a transfer pump. Just think of what some of you have spent on bigger injectors, dual hpop's, different injectors, different fuel delivery systems, etc. If someone would sack-up and build a kit, all the pullers and racers would be knocking down their door to get one. There's no replacement for displacement, and the 7.3 wins. Just how close are we to a common rail kit? How about a p-pump kit? I wanna see some posts of what has been done in this direction to make it happen.

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post #2 of 181 (permalink) Old 09-27-2008, 07:42 PM
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Re: common rail 7.3 conversion kit?!?

I brought this up before. All I lack is the money and a wrecked Duramax.

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post #3 of 181 (permalink) Old 09-27-2008, 07:50 PM
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Re: common rail 7.3 conversion kit?!?

Maybe 5 Gs after a lot of development and the first few thousand units sold.

I'll say right now I know what you're thinking:
The fuel delivery tube connects into the injector above the top of the stock injector hole. I'll say right now that without some serious injector or head re-work, that won't work. The injector will not be far enough down in the head to put the fuel in the right location (fuel bowl).
The other thing is that the sealing process relies on the rigidity of the head to keep the injector and fuel delivery tube aligned and sealed. It's just a metal-metal deformation seal.

P-pump has been done. Google Double Overtime. It's an ungodly strong twin turbo, 4wd, dedicated pulling truck.
On a street truck a P-pump would be moving backwards. HEUI system was the first electronic controlled diesel in the light duty truck market in North America.

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post #4 of 181 (permalink) Old 09-27-2008, 07:55 PM
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Re: common rail 7.3 conversion kit?!?

Quote:
Originally Posted by Power Smoker View Post
There's no replacement for displacement, and the 7.3 wins. Just how close are we to a common rail kit? How about a p-pump kit? I wanna see some posts of what has been done in this direction to make it happen.
Here is a p-pumped 7.3l... "stroked out"



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post #5 of 181 (permalink) Old 09-27-2008, 10:47 PM
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Re: common rail 7.3 conversion kit?!?

This is the main reason why i decided to keep a 7.3, build the bottom end to the hilt, and patiently wait for the commonrail system to come out. It's been done before, and if enough people get interest in it, it can be done for anywhere between 6000 and 9000. I know a guy who tried to fit 6.6 heads onto the 7.3 and said it was not even close, and gave up. The real ticket is to machine a billet steel slug the same outer dimensions as a HEUI injector, and then the inner dimension as a Duramax injector nozzle, and then custom valve covers can be made if the lines do not fit under them. If we can get full fueling up to 4000, 4500 or more RPM, youll see the 7.3 right back up top in the game again right with the mechanical cummins, and even well, the duramaxes

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post #6 of 181 (permalink) Old 09-27-2008, 11:42 PM
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Re: common rail 7.3 conversion kit?!?

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Originally Posted by PowerstrokeJunkie View Post
This is the main reason why i decided to keep a 7.3, build the bottom end to the hilt, and patiently wait for the commonrail system to come out. It's been done before, and if enough people get interest in it, it can be done for anywhere between 6000 and 9000. I know a guy who tried to fit 6.6 heads onto the 7.3 and said it was not even close, and gave up. The real ticket is to machine a billet steel slug the same outer dimensions as a HEUI injector, and then the inner dimension as a Duramax injector nozzle, and then custom valve covers can be made if the lines do not fit under them. If we can get full fueling up to 4000, 4500 or more RPM, youll see the 7.3 right back up top in the game again right with the mechanical cummins, and even well, the duramaxes
It does make sense to me... but I don't know a whole lot about these engines.

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post #7 of 181 (permalink) Old 09-28-2008, 12:45 AM
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Re: common rail 7.3 conversion kit?!?

You'd probably need a custom top half on a custom cover, if you wanted to do dual CP3's stacked staggered on top of one another like a BTS pump system.. I dont think with this big of an engine, for a performance application, a single CP3 can keep up with injecting this much fuel.. No room for a belt driven CP3 on the top of the engine like a cummins...

If you can make 1200 lb-ft of torque at 4000 rpm, that there is 913rwhp. Id say thats right back in the game...

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post #8 of 181 (permalink) Old 09-28-2008, 12:57 AM
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Re: common rail 7.3 conversion kit?!?

Quote:
Originally Posted by Power Smoker View Post
... I know it can be done for a non insane price. Just exactly what would it take to make it happen? I say an easy 5 G's could get everything we need for the basic fuel system conversion components. We're only talking about 7.3 injector blanks, new injectors for the blanks, fuel lines & rail, cp3, mounting brackets, and a transfer pump.
Which new injectors for blanks? Are they mechanical or electrical?
If electrical how would you control them?
If mechanical, how would you control them?
If Electrical, then custom computer, $$$$$$ needed.
If mechanical, then must be timed off the crank, so $$$$$$$ needed for the all new front cover and all new gearsets.
And if you want to run a water pump for the street, well that's easy, just takes more $$$ to build that in. Want to use an oem oil pump off the crank? Sure, more $$$, problem solved.
Do you really want to use a stock off the shelf cheap fuel pump? Need $$$ to even come close to the Dodges. They have 2 CP3's, right?
Same goes for injectors. Not to mention Rods, push rods, rocker arms. etc. Do you really need all that? Why go with mechanical and not be able to use the power because of crappy valvetrain?

This does come up from time to time. Anyone interested should take their ideas to a really good machinist and get a price from them.
If your project is estimated to come in under $15k you are leaving something out.
Call and talk with the guys that have done it, they can fill you in on what's needed.
It sounds simple in your head when you think about it, but talk with someone about all the custom work needed and you'll realize how much money you're talking about.

I'm not trying to discourage anyone. Just the opposite. I encourage you to find out and make it happen if you can.


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post #9 of 181 (permalink) Old 09-28-2008, 03:29 AM
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Re: common rail 7.3 conversion kit?!?

The electronics already exist. The injectors with the correct spray pattern already exist. The machine work is simple. The plumbing can be taken care of easy enough as well.

Two stock CP3s are plenty of fuel and work just fine. If that isn't enough you can bump them another 10-15% give or take a bit pretty easy with them sitting on your kitchen table.

The only real item to deal with is getting the position sensor(s) installed in a manor that the new electronics will like. This may require some custom parts depending on what the electronics need, however a wave form converter could always be built to fix that if necessary and would be relatively inexpensive.

The biggest cost in the conversion would come from the lack of cores to trade in on your new parts. The problem problem seems to be at this point the people who are really into the 7.3's and have the time and money to bring a drop-in conversion to market are committed to the HEUI fuel system so far and the HEUI still has some power left in it, just gonna be harder to get it.

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post #10 of 181 (permalink) Old 09-28-2008, 03:58 AM Thread Starter
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Re: common rail 7.3 conversion kit?!?

Hmmm... so the duramax computer will work? the firing order can't be the same, can it? Well, does that mean you change fuel line positioning? if so, no problem. I'm assuming a fairly elaborate front cover would be in order to fit a cp3 , but after the design is figured out, I can't imagine it costing over a grand. how about some brackets and adapters to fit a cp3 where the hpop hooks up? has anyone figured out if this is or isn't possible?

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