O.T. Cummings diesels
 

I'm in the process of hot rodin my 94 cummings 12v. The engine is in a 94 dodge dually with a 5 speed. So far my mods are a heavy duty clutch kit from South Bend Clutch, 4" cat back exhaust, the fuel plate has been adjusted to just this side of smoking excessively and its got a K&N air filter with a cool air box. I'm figuring my next step is to get performance aftermarket injectors ? Im also looking to head to the boneyard and find a good used turbo and will fab a homemade twin turbo setup. I've been told that will work fine with the after market injectors although I might want to install performance head studs ? I'm open to any and all suggestions. The engine is all mechanical, no computer. This truck is my hotrod and isnt driven daily although I want to keep it 100 % reliable.
Bob

Jim Jessup out of North Vernon, Indiana can tell you anything you want to know about a cummins diesel. It is all he works on and people come from all over to have him tune their trucks.

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Re: O.T. Cummings diesels
 

Jim Jessup - 812-873-7618 Very good with older model Cummins.

One word of advice though, ditch that K&N filter!!! Lots of turbos have gone ka-poot due to those. AFE filters are what I would recommend. You can probably order one that would fit in the fancy box.

As for injectors, I would highly recommend Exergy or Scheid Diesel. Both have good reputations.

And if you are serious about making power you better get the head fire ringed and real good studs or you will literally lift the head and things get ugly when that happens.

Re: O.T. Cummings diesels
 

What is it a 903?? It’s been a long time for me playing with Cummins (all pre-computer). Although, I remember a guy in our neck of the woods that had an old Jimmy with a v8 as a workin’ truck. I believe he was one of the first to come up with an after-cooler and water injection. He had a separate water system that consisted of a car radiator, electric water pump, and a large water tank on the back. This was in the mid 80's. He also had Iskenderian build him a cam at his specs.

He sure put the hurt on those of us with the NTC 400’s.

Re: O.T. Cummings diesels
 

Its a 5.9 liter six. At this stage I think I'm going to put in aftermarket 75 horse injectors and see what I've got.

Re: O.T. Cummings diesels
 

Google KDP on a 12 valve Cummins.

You need to get this done asap if you hasn't been done or you haven't done it yet!!!!!

I also agree with Knoke77 about the AFE air filter. Get rid of the K&N.

I had a 96 12 valve. I loved the engine, the rest of the truck is what I had a problem with. The brakes (issues)and mostly the POS transmission. If it would have been a manual trans, i probably would still own that truck. I had huge power and just broke stuff with it. I went through 3 trans with high dollar stuff in them. It was one too many and now I drive a Duramax.

I spent thousands on that truck, wish I would have saved my money!

Good luck!

Boy did you ever down grade

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Re: O.T. Cummings diesels
 

Whats wrong with the K&N filter ? I've used them for years on other equipment with no problems. I love the truck, it's like new and was used to haul a 5th wheel I know the former owner and he hauled 24,000 lbs all the time with no problems once he upgraded the clutch.

Re: O.T. Cummings diesels
 

I think the main reason is air flow, these turbo diesels need plenty of air, and, in some cases, they tend to drag a lot of dirt with every gulp. I can Recommend Jim, we worked together at Cummins, and he does a lot of injector and pump work, and I've never heard a complaint about him from anyone. I have a 7.3 Ford, rattle/smoke as a friend calls them, and they don't like K&N filters either, most guys that are making them perform, use a big one, about like you see on OTR rigs, and just kinda lay it under the hood, nothing fancy, but lots of area to breath thru. I like my 7.3, and the Ford chassis, my 97 F350 has just short of 400k on it, and as far as I know, hasn't had any engine work, and the truck is as rust free as one half it's age, if I were in the market for another, and could find a Ford, with a Cummins, that's where I'd be. Bob

Re: O.T. Cummings diesels
 

OK, my K&N basically sits out right up to the cool air intake on the fender. I'm in the process of building a insulated divider between it and most the heat. One of my next upgrades will probley be a larger filter as it does look a bit small. I'm going to look down the air intake past the filter, if it's clean I wont worry till I upgrade the injectors and govenour spring. This is the first truck I can honestly call a "Power Wagon" since the 1978 440 mud truck I had. This one obviously is completely different, I searched for 8 months to find a 2 wheel drive, everything up here in snow country is 4x4. Sure wish I had a garage to work out of, I'd be doing more than staring out at it thru the window and blowing snow. The only thing I am doing to the suspension is switching out the front springs for airbags.