Lets build a CR PSD.
Post Fiend
Joined: Jul 2005
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From: 21791
Ive got me a spare set of heads for um.... machining and testing.
I dont think we need to ditch the HEUI yet, give me, and a few other guys another year or two in the business. I have "enough" fuel for 900+ hp if i could just clean it up, with more air.
I dont think we need to ditch the HEUI yet, give me, and a few other guys another year or two in the business. I have "enough" fuel for 900+ hp if i could just clean it up, with more air.
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Post Fiend
Joined: Sep 2006
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From: Millbrook Alabama
All I am tryin to do is get a list goin of what needs to be done.
we know we need an injection pump Sigma is a little pricey, so might as well look at CP3 or Vp44
we know we have to have the heads worked to fit those cute little injectors......
Like I said lets brainstorm this.
Post Fiend
Joined: Jul 2005
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From: 21791
Do you want to build a common rail injected 7.3 (you can't use the PSD term if it doesnt have HEUI IMO), or a mechanical one? VP44 for the cummins is only 6 cylinder, although there are 8 cylinder rotary pumps. The CP3 is a Bosch common rail pump, and the Sigma is basically a highly customized version of a P pump, which is the BEST way to get an insane amount of fuel in the cylinder in the time allotted. at 6000rpm, it's only 2ms.
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Lead Driver
Joined: Oct 2004
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From: Columbia, MO
True common rail is going to me electronically controlled. Use a pump, like a CP3 (which is the only one I know of) to pressurize a rail that is common to all the injectors - hence the name common rail - where each injector is fed from a line off this high pressure rail.
Look at the difference between a 12V Cummins and a CR Cummins and you'll see what I mean. 12V has a line for each injector coming from the pump on the front of the engine. CR's have a line that comes from the CP3 pump to the log/rail, then lines coming from that rail.
Not at all trying to be a smartass or anything here, just clarifying. Mechanical injection has been done and is great for competition, like sled pulling. CR would be the chit though, and suitable for street and fun.
Edit: basically expanded on what Kris said. I way typing while he posted.
Senior User
Joined: Sep 2004
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Originally Posted by Diesel Power Mag
The entire HEUI system would be scrapped, and the truck would be converted to a Bosch P-pump styled injection system, using a Scheid-built "V-Pump" off of a 700-cubic-inch International engine. This meant reworking the entire engine-as a new front cover, lines, and injection system had to be designed, and the cylinder heads had to be cut and re-welded to accommodate the different injection system. Welding cast-iron is neither cheap nor easy, and Ben indicated about half the money spent on the entire engine went into the heads.
Lead Driver
Joined: Jun 2007
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From: Hampton, Maryland.
How hard can it be? The mustangs ahve been running a common rail system since the early 1980's with a return and the 4.6's are returnless, but still a common rail. I get it that diesel is bit tougher to push, or pull, but the basic set up should be similar.
Fleet Mechanic
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From: IN
Edit: Did not type fast enough....^^^
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
Jason, simple in concept, but harder to apply, especially when talking about retro fitting one to a 7.3. The machine work to actually get the injectors and stuff to fit wouldn't be all that hard. The most difficult part is going to be the electronics to control everything. There's a lot of programming that goes into making a CR system work. I think that's where the biggest expense will come from.