Page 4 of 6 FirstFirst 1 2 3 4 5 6 LastLast
Results 46 to 60 of 84

Thread: 4BT Cummins Diesel

  1. #46
    .
    Join Date
    Oct 2002
    Location
    Poth, Tx
    Posts
    4,913
    A 4.6 is wider than a big block, it doesn't fit between jeep fenderwells. And it uses 4 cams which end up being really expensive to replace. But it has a nice stong bottom end, good enough that chevy copied it in the LS series. I thought the modification for these was to blow more air into it.

  2. #47
    Registered User robertf03's Avatar
    Join Date
    Apr 2002
    Location
    Dallas
    Posts
    6,850
    Quote Originally Posted by eight
    A 4.6 is wider than a big block, it doesn't fit between jeep fenderwells. And it uses 4 cams which end up being really expensive to replace. But it has a nice stong bottom end, good enough that chevy copied it in the LS series. I thought the modification for these was to blow more air into it.
    think buick/leyland/rover, not ford
    ...

  3. #48
    Buckaroo Bonzai!!! Reckless's Avatar
    Join Date
    Dec 2005
    Location
    BFE, Tejas
    Posts
    3,655
    ok its getting off subject but keep it to the original thread idea.

  4. #49
    .
    Join Date
    Oct 2002
    Location
    Poth, Tx
    Posts
    4,913
    OK the 3.9 is too heavy, expensive, and a 4 cylinder.

    Get a 6.5 with a manual pump.

  5. #50
    wh09p! 95discovery's Avatar
    Join Date
    Sep 2005
    Location
    1003 hardwood ln
    Posts
    297
    Quote Originally Posted by eight
    OK the 3.9 is too heavy, expensive, and a 4 cylinder.

    Get a 6.5 with a manual pump.
    which 3.9 is a 4 cyl?

    edit: nevermind im an idiot

  6. #51
    Rock and Roll AggieTJ2007's Avatar
    Join Date
    Oct 2004
    Location
    Headed back to the Big D
    Posts
    6,182
    what did you expect...TAMOR is a forum with ADD
    Quote Originally Posted by afroman006
    Creighton, you have done stuff with that jeep that would make a goat go "holy ****!"
    Quote Originally Posted by afroman006
    So driving by brail is why your jeep looks the way it does eh?

  7. #52
    Tommy sucks Sharpe's Avatar
    Join Date
    Aug 2004
    Location
    Corpus Christi
    Posts
    8,826
    Quote Originally Posted by eight
    OK the 3.9 is too heavy, expensive, and a 4 cylinder.

    Get a 6.5 with a manual pump.
    Hell yah. Thats the spirit!
    On the 8th day god created the Super Swamper TSL and said "go forth and kick ass"

  8. #53
    Buckaroo Bonzai!!! Reckless's Avatar
    Join Date
    Dec 2005
    Location
    BFE, Tejas
    Posts
    3,655
    I talked with my instructor today and he said that I could add twin Turbos and play with the valve and injection timing and push upwards of estimated 250Hp and 450 torque (same if not more than the 6.5) and still get around 30mpg.

  9. #54
    Registered User uglyota's Avatar
    Join Date
    Aug 2002
    Location
    .
    Posts
    12,659
    what did your instructor say about the vibration issue?
    Quote Originally Posted by Shaggy View Post
    damnit... if everyone is leaving i want my original 15 back... i dont wanna be left with these tools

  10. #55
    Rock and Roll AggieTJ2007's Avatar
    Join Date
    Oct 2004
    Location
    Headed back to the Big D
    Posts
    6,182
    theres a catch there, you get 30mpg when not using the power, if your using the power, no 30mpg
    Quote Originally Posted by afroman006
    Creighton, you have done stuff with that jeep that would make a goat go "holy ****!"
    Quote Originally Posted by afroman006
    So driving by brail is why your jeep looks the way it does eh?

  11. #56
    Buckaroo Bonzai!!! Reckless's Avatar
    Join Date
    Dec 2005
    Location
    BFE, Tejas
    Posts
    3,655
    He said on the vibration shouldnt be that bad, bout as bad as a dodge one, i can buy some better isolators for the mounts and then bout as much vib as a SBC.

  12. #57
    AgDieseler
    Guest
    It's a cool motor, but don't think it's a practical swap. Do it for the cool factor, and don't try to justify it any other way. Cool is valid.

  13. #58
    ^TAMOR NORTH^ Graystroke's Avatar
    Join Date
    Apr 2002
    Posts
    5,206
    Quote Originally Posted by Reckless
    He said on the vibration shouldnt be that bad, bout as bad as a dodge one, i can buy some better isolators for the mounts and then bout as much vib as a SBC.
    your instructor is not very smart. a 4 cylinder would be noticebly rougher than a six...hence a balance shaft on most 4 cyl. the 4bt was originally designed for industrial stationary use. cummins didn't give a **** when their 4bt was vibrating away while pumping water into an irrigation ditch in the middle of a field. a friend of mine use to have quite a few on his ranch and said they ran forever but you had to take a tool set around to all of them and tighten loose bolts.
    did your instructor forget that straight six cylinders are naturally balanced b/c of their firing order?
    why do you think v-12's are so smooth

  14. #59
    Buckaroo Bonzai!!! Reckless's Avatar
    Join Date
    Dec 2005
    Location
    BFE, Tejas
    Posts
    3,655
    I know what you mean by the vibrations but those can be isolated with better mounts and other mods that wouldnt be that expensive. If you play with the injection timing, you can bring down the vibrations, thats why the duramaxes are so quiet and smooth, because of the timing and duration of injection. So if i play with the timing and duration the vibs wont be as bad. We have 3 of them in the shop and none are as bad as one would think. And yes the cool factor is one of the players in this eventual swap!

  15. #60
    .
    Join Date
    Oct 2002
    Location
    Poth, Tx
    Posts
    4,913
    If you retard the timing to smooth it you'll loose power, mileage, and get higher EGTs.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •