Big Cam III - PT320 to Formula 400 - TheDieselGarage.com
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post #1 of 71 (permalink) Old 12-13-2009, 10:09 AM Thread Starter
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Big Cam III - PT320 to Formula 400

On a BC3, what needs to be changed to convert a PT320 or NTC-350 to 400HP?

Is the turbo different? Are the injectors bigger? Or is it just a matter of cranking up the pump?

Thanks.
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post #2 of 71 (permalink) Old 12-13-2009, 12:28 PM
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Call your cummins dealer, give him the cpl on engine tag, and they should be able to tell you what you need to change it. I changed a bc 3, 300 hp to 400 hp, i did full inframe with new cpl, new turbo rebuilt injectors and pump to correct specs.

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post #3 of 71 (permalink) Old 12-13-2009, 02:41 PM
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Quote:
Originally Posted by 6V-92TTA View Post
On a BC3, what needs to be changed to convert a PT320 or NTC-350 to 400HP?

Is the turbo different? Are the injectors bigger? Or is it just a matter of cranking up the pump?

Thanks.
Your 350 will change over much easier to the 400. Have a CPL?
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post #4 of 71 (permalink) Old 12-14-2009, 05:26 AM Thread Starter
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I don't have a cpl, I'm looking at trucks on ebay. What is the difference between a 350 & a 400 then? Do they have different injectors or turbo?

Thanks.
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post #5 of 71 (permalink) Old 12-14-2009, 06:28 AM
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I think for the most part it is timing, turbos would mostly be the same until the later model years. The injectors could be different, but without the CPL# it is a long shot on guessing correctly.

Cody.

79 KW W900A 3406B, Holset HC5 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
injectors, RTO12513, 4.33 eaton DS380s

87 KW W900B 400BC3 with ATA, RTO15613P, 3.70 eaton DS402s

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post #6 of 71 (permalink) Old 12-14-2009, 12:33 PM Thread Starter
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Where do you find out what cpl has what parts?
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post #7 of 71 (permalink) Old 12-14-2009, 04:18 PM
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Where do you find out what cpl has what parts?
If you don't have the CPL, get the serial number stamped in the block, on the drivers side, towards the rear. It's a 7 digit number...and call Cummins and they can get you the CPL.
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post #8 of 71 (permalink) Old 12-15-2009, 02:33 AM
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Where do you find out what cpl has what parts?
Cummins, and that is if they will work with you, no matter what if you get a choice go with the 400.

Cody.

79 KW W900A 3406B, Holset HC5 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
injectors, RTO12513, 4.33 eaton DS380s

87 KW W900B 400BC3 with ATA, RTO15613P, 3.70 eaton DS402s

00 Freightliner Classic XL C15
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post #9 of 71 (permalink) Old 12-15-2009, 09:01 PM
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The NTC was a terrible piece of **** they were hard to start Smoked white, forever, They were one step below a 444. To find out what parts came with which CPL Complete Parts List we had a book, It tells you which heads kits injectors turbo Cam most everything If you have the CPL of what you have and what you want and go to Cummins they can tell you whether you old parts are a core, and prices. They may not be as helpful over the phone. Just a thought!

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post #10 of 71 (permalink) Old 12-16-2009, 12:25 AM
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The NTC was a terrible piece of **** they were hard to start Smoked white, forever, They were one step below a 444. To find out what parts came with which CPL Complete Parts List we had a book, It tells you which heads kits injectors turbo Cam most everything If you have the CPL of what you have and what you want and go to Cummins they can tell you whether you old parts are a core, and prices. They may not be as helpful over the phone. Just a thought!
You do know that the NTC moniker covers small cams all the way up to the BC3, it seems to me that anything after the 676cpl BC4 would be considered junk, which arent considered NTCs. Hard to say that a motor that is capable of 6.5MPG is a POS even if it does smoke a bit when its cold.

Cody.

79 KW W900A 3406B, Holset HC5 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
injectors, RTO12513, 4.33 eaton DS380s

87 KW W900B 400BC3 with ATA, RTO15613P, 3.70 eaton DS402s

00 Freightliner Classic XL C15
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