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Thread: 6.0 vs 8.1 swap in G30 motorhome

  1. #11
    Join Date
    Feb 2010
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    Central Texas
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    K, but does the cummins hook up to the 4L80E if not you would have to do a tranny swap also. Just thinking if you did a duramax it would be easier and don't care for that old cummins stuff anyhow, if you go diesel its going to cost craps loads, why not go for the best.

  2. #12
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    May 2008
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    Crowder, OK
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    Because Duramax isn't the best. Look at the worlds fastest/most powerful diesels... They're Cummins. Don't get me wrong, the D-Max is nice and is coming along, but it still doesn't surpas the old Cummins 12v.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  3. #13
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    Central Texas
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    Every cummins in my town blow black smoke for a mile, and couldn't pass a 4 cylinder if they tryed. That image has run't it for the cummins for me. My moms escort could smoke them. Fast is not what diesel is meant for, rather for hauling heavy loads with fuel mileage gains. So if you want both go diesel, if you just won't power the 8.1 will do it. I'm not going to fight the diesel powerplant issue, in the real world we just call them diesel dummys and they'll fight you till your blue in the face, fast thay are not, but they do have benefits in your purpose.

  4. #14
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    May 2008
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    Crowder, OK
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    Do you even read what you type before you post it? He isn't trying to make his tank of a vehicle fast. He's needing something with TQ that can pull a brick shithouse. The 12v Cummins is one of the best around for that. 10x better than the worthless 8.1

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  5. #15
    Join Date
    Jun 2010
    Location
    San Diego, CA
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    52
    Quote Originally Posted by zeake View Post
    And most likely pass emissions. Most diesel forums can answer the emissions questions. Plus it is leagl to upgrade to newer model engines you just have to retain all emission stuff from that year model engine. I know that will get you pass a sniffer.
    depends on the state. I know here in CA you can't turn a gas into a diesel and expect to pass smog
    1997 4runner
    1978 Jeep CJ7 with a 2002 5.3 engine

  6. #16
    Join Date
    Feb 2010
    Posts
    10
    Thanks for your input so far.

    I cannot do a diesel swap - not possible. Washington state will not allow you to take an emissions controlled vehicle with a gas engine and swap to diesel. Even if I could a 12v 6BT Cummins would be really hard to fit underneath a G-van. The 4BT would fit better but they are super coarse motors (loud and lots of vibration).

    So that being said (unfortunately) - which gasser would you think works better?
    Last edited by KenGVR4; 06-22-2010 at 12:56 AM.
    1991 Lazy Daze 22FL
    350 TBI - 40mph pass climbing POS
    4L80E begging for more TQ

  7. #17
    Join Date
    Jan 2010
    Location
    spanaway wa
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    419
    o sweet ur in washington, i live over near seattle, but as far as motors i would go with the 8.1 i know people dont like it but i drove a suburban with one with a mild cam in it, and it was able to drift and keep up with v6 mustangs. i know v6 but its a suburban.

  8. #18
    Join Date
    Feb 2010
    Posts
    10
    So I'm building a list of pros/cons for each motor

    Pro 6.0

    Relatively inexpensive
    Easy to find
    Decent amount of bolt on mods and aftermarket support for swaps
    Better mileage (in theory)
    No issues with fitment
    Done a million times in trucks

    Con 6.0:

    Need expensive bracket or compressor to keep AC
    Piston slap issues? (dunno if this is really a problem, it's hearsay mostly)

    Pro 8.1

    TORQUE
    old motor mounts work
    TORQUE

    Con 8.1:

    Unknown fit in G-van (I know you need to notch the frame to fit into OBS)
    Big and Heavy
    Not much aftermarket support
    Probably have to DIY wiring harness
    Big Block fuel consumption

    So that's what I've got for now - anything I'm missing?
    1991 Lazy Daze 22FL
    350 TBI - 40mph pass climbing POS
    4L80E begging for more TQ

  9. #19
    Join Date
    Mar 2009
    Posts
    146
    I think even a 6.0 would be a ton better than a tbi 350, I know my tbi 350 was a whopping 190 hp stock.

  10. #20
    Join Date
    Nov 2008
    Location
    Spring, TX
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    2,228
    IMO, 6.0 bored & stroked to 408. that should put u on par with big block torque while maintaining somewhat reasonable mpg.
    '02 Silvy: Z71 EC Step Side 5.3L Nelson tuned
    2013 GMC Acadia: SLT1 Carbon Black
    1976 Corvette Stingray: Trying to save it, progress is slow.

    ^Ricky's Sweet PS Skilz
    09/21/2010 02:31 <danger_ranger83> I'm not really worried about the looks...I want it to be fast and ugly...bc no one wants to get outrun by something ugly

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