Cummins NTC-350

The lowest available is a 5, the lower the number the hotter the fire, the next one up from that is a 7 then a 10 I believe. The truck I worked on a ways back we put a 10 in and it is low flow cooling and the haven't had any trouble.

I know of people that work their trucks with a 5 in, that's what I suggest you go with, you will be fine with your stock injectors.
 
SmokinCAT said:
The lowest available is a 5, the lower the number the hotter the fire, the next one up from that is a 7 then a 10 I believe. The truck I worked on a ways back we put a 10 in and it is low flow cooling and the haven't had any trouble.

I know of people that work their trucks with a 5 in, that's what I suggest you go with, you will be fine with your stock injectors.
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The lowest number is 00.

You really need to install a liquid filled fuel pressure gauge to know what is going on. Dropping a button in the fuel pump will increase rail pressure, but it's always better to know where you are starting before pulling a button # out of thin air. I wish I could be more help on this thread, but work seems to be getting in the way of internet time for me.
 
I can't seem to find a gauge that goes high enough. All of the gauges that I find are only oil pressure or fuel rail pressure that go to like 20,000 plus. I need something in the 100 to 500 psi range I would think.

Can I mount this gauge to the side of the block or do I need to see it as I am driving? I would have to imagine that the highest rail pressure I will see is at an idle and not at high idle while it is fueling.

The shop that rebuilt my pump said that he set the rail pressure to 200 psi.
 
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Are those still available? I knew of them, just never seen one that hasn't been made.
 
Autometer makes a liquid filled gauge that is 2 5/8" diameter, I forget what series it is, but they have one that goes to 600psi.
 
RockinRam96 said:
I can't seem to find a gauge that goes high enough. All of the gauges that I find are only oil pressure or fuel rail pressure that go to like 20,000 plus. I need something in the 100 to 500 psi range I would think.

Can I mount this gauge to the side of the block or do I need to see it as I am driving? I would have to imagine that the highest rail pressure I will see is at an idle and not at high idle while it is fueling.

The shop that rebuilt my pump said that he set the rail pressure to 200 psi.
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SPAN Pressure Gauge, Filled, 600 psi, Non Clog - Pressure and Vacuum Gauges - 5NMY5|LFS-210-600-G-KEMX - Grainger Industrial Supply

You will want to have it in the cab. Peak fuel pressure will be under load. You'll also want to install a valve on your gauge supply hose to bleed air out near the gauge. Install the gauge at the fuel solenoid port with the 1/8" pipe plug in it.

Going off the 200 PSI the pump guy gave you, you can figure about 10-15 psi for every 5 numbers down. Did he tell you what plunger was in the pump now?
 
No, I do not know what plunger is in the pump currently. I will have to look at the parts list that I was given when it was rebuilt to see if there is one on there. If not I will have to call them. I will most likely call them to get a smaller plunger anyways.

Thanks
 
Snedge said:
Where did you end up with timing?
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Well we marked the crank gear and the camshaft gear where they meet, and marked the accessory drive gear and cam gear where they met and put them back together just like that. As far as the follower gaskets go, I miced the old ones. The gasket that was closest to the originals, was the thickest gasket in my kit. We did not use the tool to find out truly what the timing is but it started up without a problem. And it virtually starts with a bump of the starter.

With this new cam all I can say is WOW!!! It is completely different, it is a completely new engine. And understandably so. The truck will actually accelerate in high gear and runs and drives great. Motor runs so much smoother and responds so much nicer!

Going to a pull tomorrow. Maybe I'll be able to get a video of it up.
 
Boy am I so proud of this truck now. It is really nothing special at all but all the time, work and of course money I have put into this think it is just a blast. Drove 2 and a half hours to this pull yesterday, which was pretty brutal. They pulled a few classes of gas and diesel pick ups, then decided they were going to water the track before the semis. The turned it into a 4 wheeling pull. I pulled in 4th gear, which my dad didnt think it would hold 4th. But I as soon as I got the clutch out the rears just wanted to dig to China. So I backed off and was able to lay into it at about 75-100'. Ended up pulling 260'.

I know my truck is by far not the strongest truck there. I am just overly excited that it made the trip there, pulled and drove home with no problems.

I had a very competitive nature when I was in school and I figured it would transfer over to this. But like my dad said "I don't care if I win or lose, I just want to see what I can do with my truck. Try to make it a touch better week in and week out." I absolutely had a blast with my old girl yesterday!

No video though...
 
Snedge, you know of anyone that has had valve train parts for these old engines made? I keep having troubles with injector push tubes and keeping them straight, mines a big cam 1, I have heard that the later non STC big cam 4s use a better tube, is this true?

Also wondering if you still had either of the H5s you had a while back?
 
I figured out that some of the NT88 engines use a different push tube, Im going to check the length on them when I get a chance.

Something else I have been pondering, with the different throttle shafts that are used what changes between them? I have seen that there is a measurement with them on the aftermarket site I was looking at, just curious with what a larger opening in the throttle shaft would change.
 
SmokinCAT said:
I figured out that some of the NT88 engines use a different push tube, Im going to check the length on them when I get a chance.

Something else I have been pondering, with the different throttle shafts that are used what changes between them? I have seen that there is a measurement with them on the aftermarket site I was looking at, just curious with what a larger opening in the throttle shaft would change.
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More fuel. The throttle shaft acts like a metering valve for fuel. The bigger the hole the more fuel delivered. Have you ever dealt with Diesel controls over in Masslin Ohio?
Diesel Controls, Inc., Diesel Repair, Diesel Parts and Diesel Services.

Yes I still have the HC5's
 
We don't have enough of a following to film our pulls. But my truck pulled decent this weekend. I was 4 of 5 behind 30 ft behind a KTA, V8 Mack and Electronic Cat. My truck hopped a little of the starting line and started hopping again at about 150'-175'. I let off and tried to get back after it but, she just wouldn't pick it back up. I really need to let some tire pressure out to get rid of that hop, but with these two piece wheels and tubes, I'm afraid of letting them down to much and breaking the valve stems off.

That A model KW with the 3406 in it is awesome! There is nothing like the sound of a Caterpillar, that thing sounds just like Sneaky Pete when he lets the clutch out and mashes the throttle.

Cody, what do you have in your truck for a trans and axle ratios? What gear do you pull in?

I also called Cummins NortEast today for fuel plungers and governor springs, they will not sell them to me because then the pump will be out of spec and they don't want to be responsible for melt down.
 
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I haven't got around to getting a hold of them, got a dead kitty cat to put back together first then I will be back at it on the 855, I think if I get thru September I'm going to pull the 855 out of the cabover and go thru it with some new parts.

PM me about the HC5s, I might be able to get one sold.
 
My K100 has 4.33 rears and a RTO12513, I pull in the last gear in the low side, and if I see 3100 rpm it is around 27mph wheel speed.

I bought my camera specifically to record the pulls, that's all it does.
 
Try the place Snedge listed above, and be honest with them about what you are doing.
 
I've got a camera just need to get ahold of an operator!

My KW has 4.11 rears with a 10 speed deep reduction. The first time I pulled, I pulled in 4th gear and ran out of RPMs. Saturday I pulled in 5th gear (highest gear on the low side). I was able to get it started pretty good and don't know if I really ran out of RPMs, close though. 4th gear is about 20 mph on the road and 5th gear is about 24-25 mph. If I could hold 5th gear on all tracks I'd be happy with that.

Maybe be getting a hub piloted conversion to 22.5s, so we'll have to start from square one again. That maybe a winter project through, we have a pull pretty much every weekend through Labor Day.
 
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