Cummins NTC-350

I myself love the way my truck is setup gearing wise, I have yet to find a self that I can't take off with in this gear, if it is heavy I usually run out of power, but if I can get my rpms up its a fun ride.

I will be honest too, everything in my engine can be bought from cummins, I like that part of it but it is time for some more fuel, the truck I came in second to has a modified set of injectors and a 1 1/4" gear drive pump that has been set up well, he is also running a newer S500 turbo.

I may put together another pump and build it with a 1 1/4" gear drive, but the base will be a 903, I hoping that I can get some more rpm than what I have now under power.
 
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Well if you need parts I have a big cam 400 (I believe) that I can get you parts off of. It was given to me by one of my dads good friends, he was taking it out of a truck and put a hole in the oil pan. All he wanted was the transmission.

I want the motor for the exhaust manifold, turbo and intercooler plumbing. I may take the alternator and start to be rebuilt to have as spares. But other than that everything that is any good is going up for sale.
 
Your pan will fit that engine, I would try and get through until winter and that would be the engine I would be building. I know you said you like the Cats and don't get me wrong I do to, but a hot 855 is a fun thing to play around with.
 
I thought about that but it is going to be more work that I think I want to get into at the moment. It is a later one because I took the rocker boxes off of it after the cam followers, and noticed it had top stop injectors. But the motor has been sitting outside for two years with a hole in the pan.

My dad also just got a smokin deal on a 4MG that supposedly "sucked an o-ring" and started to get warm and the guy shut the motor down, shortly after a rebuild. We're gonna get that home and go over it. Not really banking on that being good, but potential.
 
Rods are the same, the pistons could be lower compression than the small cam depending on what cpl it is. They use the same wrist pin so it's easy to change pistons, and all NTC injectors spray at the same angle so the piston bowl is the same.

The cam will not fit, it's a 2 1/2" diameter cam and the small cam is 2". Injector travel for the small cam is .176" and the big cam is .224" I'm not sure of the variation in the valve lift.
 
Yeah, I Know the cam shaft wont work in my small cam, don't want that anyways since I just put a cam in it. I was thinking that I could send the pistons out of the big cam to Swain Tech to have them ceramic coated, since they are about 40 minutes from my house. Then I could hopefully really put the fuel to it, plus a charger of course.

Piston bowls and valve reliefs were my main concern.
 
I was thinking that those different rods pre dated these small cams, easy enough to tell them apart, ones uses nuts and bolts that come in from the top and the other uses only bolts from the bottom.
 
Im not happy with what I did this past weekend, I swapped in a set of supposedly flowed injectors that could have anymore done to them, I lost 7psi on boost over the factory cummins part number I was using.

I am slowly loosing my faith in anyone that says they can do work on top stop injectors, I will be calling diesel controls this week to see if they can go thru the set I took out and open them up.
 
I am in need of more fuel too. I backed the pressure screw out if the throttle shaft 3 turns before the pull Sunday. It smoked no more Sunday than it did Saturday. I have a turbo off of a Big Cam 400 and hoping to give it a few more rounds if fuel pressure.

I'm kinda nervous about giving it to much fuel though. I've never smoked my clutch, it's never slipped, and I haven't lost adjustment but after I pull I can smell clutch. I'm hoping I can get this season out of it.
 
SmokinCAT said:
Im not happy with what I did this past weekend, I swapped in a set of supposedly flowed injectors that could have anymore done to them, I lost 7psi on boost over the factory cummins part number I was using.

I am slowly loosing my faith in anyone that says they can do work on top stop injectors, I will be calling diesel controls this week to see if they can go thru the set I took out and open them up.
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Have you talked to Pittsburgh Power?

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I have had a friend that talked with them, he even bought one of their pumps, when he did he asked about a set of injectors, they said what they would be able to do was a set in the 290cc range which is exactly what was scribed on the set I put in.
 
SmokinCAT said:
I have had a friend that talked with them, he even bought one of their pumps, when he did he asked about a set of injectors, they said what they would be able to do was a set in the 290cc range which is exactly what was scribed on the set I put in.
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10. Some guys don't seem to like Bruce much but I do think he knows a mech Cummins pretty well.

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Some of it comes from his ideas, like when he says advancing the injection timing is bad for the engine. Stuff like that just doesn't sit well with people, when it's been shown that I is the exact opposite of what he says.

I have no doubt that he knows a mech cummins, but if a person took the time to do the research the info is out there.
 
I believe it is, if course anytime something is rated by CC's it it per 1000 cycles. For as clean as they burn I could probably work the truck with them in, so I would guess it is for the complete set.
 
Interesting... I wouldn't even begin to know how to quantify the flow of these injectors. As far as what is a lot and a little. I imagine it a bit different between top stop injectors and my injectors.
 
When looking at how cummins rates them it is a different quantification than how a shop would do it, they have a number, but they also have a letter code with them that I believe is supposed to be related to travel.

Take my stock injectors for example are listed by cummins as a 176BK, the set I just took out were a 191BK. There are only a few that go bigger on the tips from the factory than what these are and most of them are for twin turbo engines.
 
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