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Old 11-24-2008, 12:01 PM   #1 (permalink)
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Best cummins for swap

I have searched...but there are so many cummins threads on here it is hard to sort through. Looking for advice about a cummins.
My dad and I are building a tow rig. Started life as a FC Jeep (dually). Basically just the cab now and we are modifying a 1 ton crew cab frame. It is a four door model FC. We will be buildling a custom bed to haul tool boxes, welder, etc. It will tow a two place gooseneck trailer with two jeeps on it. I will probably get flamed here for this project, but it will be one of a kind and when we get done with it, it will be very unique and very tough.
We want to run a cummins, auto, 2wd, dually rear. What is the best cummins for this and what years are we looking for here. A friend of ours is in the salvage auto business and can get us pretty much anything we want as far as trucks go. Just need your advice as to what the best engine is??
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Old 11-24-2008, 02:32 PM   #2 (permalink)
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97-98 12V -- that came with a 5 speed... Highest Hp rated 12V.
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Old 11-24-2008, 03:22 PM   #3 (permalink)
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97-98 12V -- that came with a 5 speed... Highest Hp rated 12V.
Dont worry about the year. The HP can be adjusted VERY easy on them. I would go with a p-pump 94-98 12v first then a 89-93 VE engine next.
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Old 11-24-2008, 03:34 PM   #4 (permalink)
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id agree with above. for what its worth, the 89-91 cummins do not have an intercooler.

i know youd be looking at custom plumbing anyway in your project,but if youre planning on running an intercooler and getting a complete donor truck,getting with the right year will at least give you one to start with.

also the non-intercooled head is alittle different,and uses different injectors,IIRC.

definately start a build thread and keep us updated
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Old 11-24-2008, 04:09 PM   #5 (permalink)
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id agree with above. for what its worth, the 89-91 cummins do not have an intercooler.

i know youd be looking at custom plumbing anyway in your project,but if youre planning on running an intercooler and getting a complete donor truck,getting with the right year will at least give you one to start with.

also the non-intercooled head is alittle different,and uses different injectors,IIRC.

definately start a build thread and keep us updated
Correct on the non-I/Ced injectors. but you can use the adaptors to use teh smaller injectors. Besides non-I/Ced injectors can make more power tehn teh I/Ced 1st gens.

i have a 89 w/ accessory's for sale in the classifieds. Also have a 1st gen intercooler but If you have to do it from scratch anyway I would upgrade to the biggest intercooler you can fit.
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Old 11-24-2008, 05:33 PM   #6 (permalink)
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Dont worry about the year. The HP can be adjusted VERY easy on them. I would go with a p-pump 94-98 12v first then a 89-93 VE engine next.
Very true but if you can pick your year, and he said he wanted the best

Here are the P-pump (P7100 injection pump) stats:

Stock HP/Torque
94-95 Auto 160/400
94-95 Manual 175/420
96-98 Auto 180/420
96-98 Manual 215/440
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Old 11-25-2008, 06:18 AM   #7 (permalink)
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Thanks for the info.

I will get a build thread started.
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Old 11-25-2008, 08:33 AM   #8 (permalink)
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I put a 2004 Cummins commonrail in my Ford SuperDuty. It was a brand new crate engine, 235hp California engine. Reason I chose the CR was of easy and cheap upgrades to make tons of power and great mileage the 03-04 Cummins have produced.
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Old 11-25-2008, 12:12 PM   #9 (permalink)
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I've gotta go against the PBB grain here. If your buddy can get anything, get an 03+ comonrail engine. It'll be in better shape, make more power and you can throw an Edge, Smarty, TST or whatever programer you want on it and adjust power levels while you're driving. Plus Painless makes a conversion harness for it now.

New tech in old rides is always cool.
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Old 11-25-2008, 08:15 PM   #10 (permalink)
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Quote:
Originally Posted by chris demartini View Post
I've gotta go against the PBB grain here. If your buddy can get anything, get an 03+ comonrail engine. It'll be in better shape, make more power and you can throw an Edge, Smarty, TST or whatever programer you want on it and adjust power levels while you're driving. Plus Painless makes a conversion harness for it now.

New tech in old rides is always cool.
While it is not hard at all to wire in a CM850 engine, why would you want to?
Way more expensive, much more complicated and they are a much more tempermental engine.
The p-pump 12vs are the way to go. They will deal with any fuel. Easy to install. Free to upgrade power. At this point, they can be had basically for pennies. The p-pump 12v engine will give years of trouble free service, something the CM850 engine will not do.
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Old 11-29-2008, 09:40 AM   #11 (permalink)
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While the commonrail is an awesome engine, I have to agree with Robert here. Why would you want to deal with the CP3 problems, the lift pump problems etc? Put a big pressure box on it, then you are dealing with possible cracked injector tips etc. The 12valve is the way to go, and the p-pump are definitely the best of the 12valve motors, way less issues with fuel leaks etc, pumps are easier to modify, timing is far easier etc.

It's up to you in the end, what are your goals?


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