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Cummins NTC 300 CPL 0471

Posted By Dan Bruno Friday, February 13, 2009 2:43 PM
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Dan Bruno
 Posted Friday, February 13, 2009 2:43 PM
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Gang,

I have a 1982 Cummins BC2 NTC300 in one of my trucks.  It runs well but I believe it is a Formula set-up as the R's top out around 1950.  I had the pump rebuilt by Cummins to CPL specs about 10 years ago and haven't put many miles on it since then.  I'm looking for what I can do with a CPL 0471 within reason to at least bump the torque and hp.  The truck pulls down on hills pretty bad even with an empty trailer and I'd like to improve that.  Last week, an old lady in a walker lapped me.

Also, can anyone tell me what Jake will fit a 0471?  I was assuming maybe a 25B.

Dan
www.stlouisdumptrucks.com

www.rdproductionstv.com

4bangor
 Posted Friday, February 13, 2009 3:13 PM
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subject; low power; 1 check line from intake to pump for leaks, [its for the smoke delay],the old anoroids were easy to by pass  and test for power complaints, 2  be carefull and remove snap ring on high speed spring and put about 3to 4more shims about 020. to raise NO LOAD high idle to 2175 , , on cummins pt fuel system it takes a few pump changes to get it right as the timing is fixed, whereas a cat pump, or bosch systems have options, also timing adj.      you will go nuts with all the cpl bull ,on the subject of jake brakes, you do need to install the exhaust valve bridges and cut rocker arm tips on some models p/s take the pump off and have the anoroid checked out, as it controls the output of fuel ,[them years it was built in pump] it works in conjuction with the turbo boost, ,  thats the problem, no charge,,, 
Dennis Wells AKA Smiley
 Posted Friday, February 13, 2009 3:29 PM
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Dan Bruno (2/13/2009)
Gang,

I have a 1982 Cummins BC2 NTC300 in one of my trucks.  It runs well but I believe it is a Formula set-up as the R's top out around 1950.  I had the pump rebuilt by Cummins to CPL specs about 10 years ago and haven't put many miles on it since then.  I'm looking for what I can do with a CPL 0471 within reason to at least bump the torque and hp.  The truck pulls down on hills pretty bad even with an empty trailer and I'd like to improve that.  Last week, an old lady in a walker lapped me.

Also, can anyone tell me what Jake will fit a 0471?  I was assuming maybe a 25B.

 

Was that Diann? I have been looking for her.

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glenn akers
 Posted Friday, February 13, 2009 3:41 PM
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Dan that engine is timed at .060 and that is fast so the only other cpl with out big changes is the cpl 485 and it has same timing and pistons turbo and injectors cam. That is hi/compression pistons and fast timing so dont want to go much hotter for a work truck. If it is a toy truck then get the pump set up to what you want. If you change to cpl 485 i would pull pump and take to pump shop and have them to set pump for a cpl 485 and tell them what trans you have and if you want to run it at 2100rpm or not. He can set the pump to a fuel code of the torque rise you need for the trans you have. If you have a 9 speed you want a hi/torque rise and if a 13 speed not so hi torque rize. The jake brakes need to be applied in model as of what cpl you have. Some guys get by with putting their buddies jake brake on and not having much problem with it but i am telling you i have seen a lot of doubled up push rods and followers broke form this. So i alway say use the one that is made for it. The jake model 425A,401C is the model that should be used on the two cpl engine that i have talked about.

glenn akers
Aaron
 Posted Friday, February 13, 2009 4:35 PM
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Dan 25B's won't work on a big cam.
Glenn, 60 seems slow to me but maybe for that cpl it is fast.
Most pump shops will only build to what the pump is coded to not to what you tell them to set it up as. I had a pump marked as NHE 230 and it was on a NH 280, pump man and I went round and round to set it up for a 280, but it sure ran better when it was right.


I can't get anymore out of it, I've got both sticks hot clear up to the knobs allready.
www.killcarb.org
glenn akers
 Posted Friday, February 13, 2009 5:23 PM
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''

Aaron not for a big cam. The big cam engine for a 300 or 350 should be .o60  and .065 and for a 400 horse it needs slow down to .070. The cpl 838 and 840 is at .101

glenn akers

Dan Bruno
 Posted Friday, February 13, 2009 5:57 PM
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Okay, you guys lose me with some of this stuff.  Not that I don't understand the theory, I just am a bit fuzzy on how to make it happen.  I also forgot to say that I have a new pulse manifold on it and the turbo boost is 17-18.  The only thing I have ever had wrong with this engine was a cracked injector cup that was replaced with a Recon injector.  I have absolutely no smoke to speak of and the engine sounds great.  I do have the ticking referred to in another post, so I'm not sure if I have the bad roller or need the overhead adjusted.

What is the engine rating for the other CPL (0485?) you are talking about?  As I understand it, you are basically saying its just a pump setting that's keeping me at a 0471 CPL?

Dan
www.stlouisdumptrucks.com

www.rdproductionstv.com

Eddy Lucast
 Posted Saturday, February 14, 2009 12:27 AM
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Dan Bruno (2/13/2009)
Okay, you guys lose me with some of this stuff.  Not that I don't understand the theory, I just am a bit fuzzy on how to make it happen.  I also forgot to say that I have a new pulse manifold on it and the turbo boost is 17-18.  The only thing I have ever had wrong with this engine was a cracked injector cup that was replaced with a Recon injector.  I have absolutely no smoke to speak of and the engine sounds great.  I do have the ticking referred to in another post, so I'm not sure if I have the bad roller or need the overhead adjusted.

What is the engine rating for the other CPL (0485?) you are talking about?  As I understand it, you are basically saying its just a pump setting that's keeping me at a 0471 CPL?

 

Dan,

You say this truck isn't up to snuff pulling a hill. My old Road Commode was was a big cam Formula 290, it pulled the hills well, but it was the gears. It was geared out to 63 MPH and turned about 2050 running 24.5's.

How fast is this truck geared?



Eddy Lucast

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glenn akers
 Posted Saturday, February 14, 2009 2:46 AM
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Dan the 485 cpl would be a 350 HP. About a year ago cummins had a special on the fuel pumps calibrated and exchange for 385.00 so that is something to look at. Exchange it for a ready to go fuel pump and them tell them the fuel code you want in it.

glenn akers
Dan Bruno
 Posted Saturday, February 14, 2009 3:50 AM
Standin' Dan ATHS Member

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The truck has 4.11's with an RTO9513 and 11R22.5 tires.  It tops out around 68 at the goverend RPM of 1900 to 1950.

Dan
www.stlouisdumptrucks.com

www.rdproductionstv.com

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