Cummins NTC 290 inframe build

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Jan 29, 2022.

  1. baha

    baha Road Train Member

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    You must remember that going to a larger turbo will make it have great top end power but getting the truck up to speed will be sad because the turbo will lag in getting spinning and making power till you get moving in top gears?
     
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  3. mile marker 27

    mile marker 27 Medium Load Member

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    Wouldn’t have to be better than the original 0217 CPL turbo, considering matching injectors, pistons, AC and timing, to a 0160 cpl? The truck is sitting on 4:44’s with 13OD.
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    Depending on the turbo it could get worse.
    I thank it was the HT3B turbo and pulse manifold that replaced the VT50 and log manifold. They did a good job on the SC's we up dated.
     
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  5. mile marker 27

    mile marker 27 Medium Load Member

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    I guess I’d go with the turbo that the 0160 or 0248 suggest. They do share the same turbo in the cpl manual. With the timing adjusted, AC, injectors, turbo and pistons, along with sharing the same cam as the original, it should virtually be a NTC 350, when complete.
     
  6. mile marker 27

    mile marker 27 Medium Load Member

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    Is the HT3B a Holset turbo? Along with the pulse manifold update, is the HT3B an update over the original NTC 350sc turbo?
     
  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    SmokinCAT probably forgot more about these than most people know. He just usually sits back, wise man. There are a couple other folks but they have not joined in.
    The things that most people have suggested are right off what Cummins made from the factory. Who would know more about these engines than them?
    About all we ever did with small cams was build them to the highest HP cpl without buying a cam. These trucks were normally gear bound because they were made when the national speed limit was 55. We usually used a bit lower number fuel button and set the no load RPM up at about 2500 RPM. Then they should pull out under load around 2350. That is to the best I remember. One built to a 400 and set up this way would surely get to 425 HP with no magic pixie dust.
    I have learned that is not the best way but it worked OK for us. Folks drilling holes in dimes and such can cost you a lot of money.
    If your turbo is good maybe just run it. The upgrade would be what came on a BCIII.
    The 0160 was most common so why not go with that? Get a cooler set up from your salvage buddy.
    We found transmissions to be a less expensive way to change gearing than diffs tires and wheels.
     
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  8. mile marker 27

    mile marker 27 Medium Load Member

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    Thanks a bunch. With more horsepower, I’m probably gonna change the rear ends out. I’ve got a set of 4:11’s and 3:73’s. I’d have to look at the tag again but I’m certain the transmission is a 1,250 torque 13 speed.
     
  9. SmokinCAT

    SmokinCAT Road Train Member

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    Yes, a HT3 is a holset, as far as the pulse manifold you have to watch which version you go after.

    There are large and small port versions, you want to get the one that matches your heads, if you have the larger port heads that early pulse is hard to find and might be best to stick with the stock style log manifold.
     
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  10. SmokinCAT

    SmokinCAT Road Train Member

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    You will never hurt a 12513 with the engine you have, I would not worry about the transmission.
     
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