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N14 back to PT pump, no STC

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Oldschool3400, Apr 11, 2023.

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  1. Apr 11, 2023 #1
    Oldschool3400

    Oldschool3400 Bobtail Member

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    Want to build an N14 using N14 lower end, less cam and a BC 3 or 4 fuel system.
    Am I nuts?
    Were there any N14 mechanicals without STC?
     
    Oldschool3400, Apr 11, 2023
    Oldschool3400, Apr 11, 2023
    #1
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  3. Apr 11, 2023 #2
    IH9300SBA

    IH9300SBA Road Train Member

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    Not that I remember for on-highway. There may be some industrial engine applications that didn't have it.
     
    IH9300SBA, Apr 11, 2023
    IH9300SBA, Apr 11, 2023
    #2
  4. Apr 11, 2023 #3
    W923

    W923 Road Train Member

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    I don’t believe any of the industrial ones I have seen were straight pt system…all stc. However the l10 and m11 were fairly common to be pt in the lower power and stc for higher ratings so possibly the n14 was also.
    Stc system was cummins way of getting better timing control. If you go 3406 cat they have a good timing system although it does need rebuilt more frequently than I would like.
    I am not so sure that regular pt injectors won’t fit in a stc n14 but you will need to disable the oil system and the fuel pump won’t care which injectors it’s running( a celect fuel pump will not work)
     
    W923, Apr 11, 2023
    W923, Apr 11, 2023
    #3
  5. Apr 11, 2023 #4
    wore out

    wore out Numbered Classic

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    What you’re gonna run into is the piston crown of the N-14 pistons won’t match any big cam injectors. They can be made to start and run but not right. I have known several people try…. All abandoned the idea pretty quick
     
    wore out, Apr 11, 2023
    wore out, Apr 11, 2023
    #4
    BoxCarKidd, Oxbow, Oldschool3400 and 2 others Thank this.
  7. Apr 12, 2023 #5
    Oldschool3400

    Oldschool3400 Bobtail Member

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    That brings this question, if memory serves I think I know.
    BC3-4 rods are not the same on the small end but would the BC rods and appropriate piston run on N14 Crank?
     
    Oldschool3400, Apr 12, 2023
    Oldschool3400, Apr 12, 2023
    #5
  8. Apr 12, 2023 #6
    Oldschool3400

    Oldschool3400 Bobtail Member

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    Just finished overhaul of 2000 vintage N14 industrial it is STC.
    After studying the operation of STC I am of the opinion that the entire system could be done away with.
     
    Oldschool3400, Apr 12, 2023
    Oldschool3400, Apr 12, 2023
    #6
  9. Apr 12, 2023 #7
    wore out

    wore out Numbered Classic

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    No
     
    wore out, Apr 12, 2023
    wore out, Apr 12, 2023
    #7
    BoxCarKidd and Oldschool3400 Thank this.
  10. Apr 12, 2023 #8
    Oldschool3400

    Oldschool3400 Bobtail Member

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    Your right.
    BC crank would run in N14 block but it all falls apart at the rod journals.
    Suppose could go that route and use BC rods, pistons right on up.
    But the N14 is way tougher.
    Thinking keeping it N14 STC just not using the STC valve and plumbing.
    It only runs advanced at idle and low load conditions.
    Use parts match per STC CPL.
    Still in the planning mode for now but have a running N14 and a 400Hp BC at my disposal.
    The N14 I have is celect.
     
    Oldschool3400, Apr 12, 2023
    Oldschool3400, Apr 12, 2023
    #8
  11. Apr 12, 2023 #9
    wore out

    wore out Numbered Classic

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    You’re begging for heart break but go ahead. Be sure to give us a 100k update
     
    wore out, Apr 12, 2023
    wore out, Apr 12, 2023
    #9
    BoxCarKidd, Oxbow and Siinman Thank this.
  12. Apr 12, 2023 #10
    Oldschool3400

    Oldschool3400 Bobtail Member

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    You a driver?
     
    Oldschool3400, Apr 12, 2023
    Oldschool3400, Apr 12, 2023
    #10
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