5.9L Rotary Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps Related To Performance And Longevity

new to 12 valves

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Old Dec 21, 2010 | 11:00 AM
  #1  
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Default new to 12 valves

im plannin on buyin a first gen sometime here within the next few months and i was wonderin what all can i do it to get the most power out of it? what can i turn up, what can i add? i just want to know what all i could do if money wasnt a problem. so just give me realistic ideas that wouldnt completely break the bank.
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Old Dec 21, 2010 | 12:00 PM
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guages and a clutch or tranny would be first just to get the weak points out of the way, then start by working on the pump you can go anywhere from modified pump to just sliding the stock plate, the performance availabilty of these engines is limitless. what are you planning on building it for street, strip, towing, sled pulling. what your building it for determines which route you should take.
 
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Old Dec 21, 2010 | 12:34 PM
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There is no sliding a plate in the rotary/ve pumps. You can turn the fuel up on them fairly easy. Just use the search feature because there is a bunch of info on this site already.
 
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Old Dec 21, 2010 | 03:58 PM
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go to the sticky, it has a bunch of stuff that'll answer your questions.
 
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Old Dec 22, 2010 | 06:47 AM
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i want to eventually make it into a puller, drag, anything really
 
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Old Dec 22, 2010 | 09:12 AM
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dazed is right sorry about that. if money isnt an issue then i would begin with converting it to a p pump versus the ve rotary design. then your options WOULD be limitless. rotary pumps ve (1st gen) and vp (24v) were notorious for going out without upping the fuel supply and monitoring it closely when highly modified.
 
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Old Dec 22, 2010 | 09:31 AM
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If your just looking to go out and play the old ve is still a strong pump. Like anything though you have to do the supporting fuel mods to all three pumps to make them live. I've seen a hand full of p-pumps die as well. Knock on wood i've yet to loose a ve on any of the trucks I've wrenched on.
 
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Old Dec 22, 2010 | 03:51 PM
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how much are u wanting to spend is it 4x4? auto, standard? throw out how much ur wantin to spend just an estimate and that will help tell u wat u wanna do first.
 
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Old Dec 22, 2010 | 07:52 PM
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Originally Posted by keithduke01
rotary pumps ve (1st gen) and vp (24v) were notorious for going out without upping the fuel supply and monitoring it closely when highly modified.
Regarding the 1st gen VE rotary pumps, your statement is most incorrect. The VE is not damaged with a failed lift-pump. It will just move less fuel to the point that the driver will know something's up with the truck. There are a number of gravity fed VEs in both industrial and agricultural applications.

If you're after enough power that you'd consider PEE-pumping it, you'd just as well go ahead and get a 2nd gen and save some money beefing up the engine and trans.

The 91.5 ~ 93 12v is the same as that in the 2nd gen trucks except for the IP (and related stuff: pop-pressures, etc). The VE based CTD can be built to provide 400 ~ 450HP reliably. 500HP+ if you don't mind maintaining it. Pretty-much build it like you would in any other high-performance 12v application. The same years automatic trans (A518, AKA: 46RH) can be built to support said HP reliably.

 

Last edited by BC847; Dec 22, 2010 at 08:02 PM.
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Old Dec 23, 2010 | 06:31 AM
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Turn in the fuel screw. Adjust the Star Wheel and the Smoke Screw. Get a 366 spring, a fuel pin, an Electric lift pump, HX35 or HE351CW turbo, make a Cold Air Intake and Gauges (Boost, Pyro, and Trans Temp. if it's an auto).
 

Last edited by CaseyF; Dec 23, 2010 at 06:36 AM.
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