what year C15's are 6NZ

Discussion in 'Trucks [ Eighteen Wheelers ]' started by inthewind379, Mar 17, 2013.

  1. inthewind379

    inthewind379 Bobtail Member

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    I have read the 6NZ is the best C15 , what model years did they build them and what would the difference be ? Why are they so much better ? And lastly how can you squeeze the best fuel economy out of them ?
    I am shopping for a pre emission truck and found a few with fresh 6NZ engines and a few with fresh series 60 12.7 .
    How much more to overhaul the Cat ?
     
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  3. underpsi

    underpsi Road Train Member

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    Pretty sure the 6NZ's started in 2001 and went until early 2003. No difference in different years of 6NZ's. Cat could cost up to 25K for a rebuild normally Detroits are up to 15K
     
  4. inthewind379

    inthewind379 Bobtail Member

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    what is the difference between 6NZ and non 6NZ , C15's ?
     
  5. inthewind379

    inthewind379 Bobtail Member

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    Mar 17, 2013
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    Anyone have an answer ?
     
  6. underpsi

    underpsi Road Train Member

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    From the beginning of the Electronic Cats, just a general guide line in order of introduction.

    5EK 40 pin ECM, single timing sensor 14.6L

    6TS 40 pin ECM, single timing sensor 14.6L

    1LW 40 pin ECM, single timing sensor, stronger block then previous, 14.6L

    5DS 40 pin ECM, single timing sensor, stronger block then previous, 600hp big bore 15.8L

    2WS 70 pin ECM, Dual timing sensor, same block as 1LW, 14.6L

    1MM 70 pin ECM, Dual timing sensor, same block as 1LW, bigger bore 15.8L

    6NZ 70 pin ECM, Dual timing sensor, block machine out old cam bore (from mechanicals), new sealing surfaces, 14.6L

    7CZ 70 pin ECM, Dual timing sensor, 600hp 15.8L

    MBN 70 pin ECM, Dual timing sensor, horrible ecm programming, high compression ratio, high temps, 14.6L (often flashed with 6NZ or 7CZ files to run much better)

    BXS different 70 pin ECM, twin turbos, IVAs (intake valve actuators), longer stroke, 15.2L

    MXS 120 pin ECM, twin turbos, IVAs (intake valve actuators), longer stroke, 15.2L

    NXS 120 pin ECM, twin turbos, IVAs (intake valve actuators), longer stroke, 15.2L
     
  7. Superhauler

    Superhauler TEACHER OF MEN

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    last four in my opinion junk junk junk junk!!!:biggrin_2559:
     
  8. tommygun58

    tommygun58 Light Load Member

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    You can do a cat in frame a lot cheaper with after market kit
     
  9. stayinback

    stayinback Road Train Member

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    Nope- Gordon Robertson did his 12.7 detroit in his driveway..$4500 including a reman head. Less injectors and turbo
     
  10. tommygun58

    tommygun58 Light Load Member

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    On youtube a guy goes by kt3406e. He rebuilds and has some good info about cats. He gets about 30k but goes way above and beyond anyone else i know of .machine work and probably builds better than brand new!
     
  11. starmac

    starmac Road Train Member

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    A friend of mine has his acert in the shop right now, it will also have to have a new cam and everything that touches the cam for a warranty, estimate was 44,000.
     
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