2 Bolt vs 4 Bolt
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 14 of 38

Thread:
2 Bolt vs 4 Bolt

  1. #1
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default 2 Bolt vs 4 Bolt

    we all know a 4 bolt main set-up is the best, BUT, will a 2 bolt main set-up work with a low HP application?...say 375-400HP...how much RPM will they handle?

    how many of you are running 2 bolt main motors & what kind of RPM's are you turning?

    FastRat

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Hondo Jet blown540's Avatar
    Join Date
    Feb 2008
    Location
    Holland, Mi
    Posts
    120

    Default

    I believe a cast crank 2-bolt combo is good for up to [email protected] beyond that cap walk becomes a problem and it's bye bye bearings. My old motor was a cast crank 2-bolt in the 500hp area. I beat the hell out of it (over revved it, over heated the oil) but when I tore it down the bearing were still good! These are stout motors, they will take 400hp for years trouble free

  4. #3
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
    Join Date
    Dec 2007
    Location
    Newton Ks.
    Posts
    6,834

    Default

    I run over 600 from my 2-bolt, cast cranked, nitrous snorting, 30 year old 454, it's fine.

    Keep the cast cranks under 6,000RPM and a good balancer on them.
    Make yourself sleep a little easier with a set of ARP main studs in it, beefs it up a bit, and not terribly expensive.

    I run a max of 5400 most of the time, untill toggling in the nitrous.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Sit N' Spin Jetaholic's Avatar
    Join Date
    Dec 2007
    Location
    Droppin' the kids off at the pool
    Posts
    1,423

    Default

    I'm running estimated [email protected] on a 2 bolt main. I did put the ARP main studs in though for some added strength. But I'm running OEM cast crank and stock rods with forged pistons at 9.5:1 compression. Been beatin' the hell out of it this season...unloaded the pump several times on it. I do have a rev limiter set to 6000RPM, which IMO every jet boat should have a rev limiter. But as has already been stated above keep it under 6000 RPM and she'll perform like a champ for years to come.

    Just my $0.02.



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

  7. #5
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Word is that a studded 2 bolt is as strong as a stock 4 bolt. You have nothing to worry about. My old 496 was a studded 2 bolt and it made 700hp and I turned it 6800 with absolutley no problems. Still running strong today, 7 years later.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  8. #6
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Hey Blown540, What heads are those?
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  9. #7
    Senior Member
    Join Date
    Aug 2008
    Posts
    357

    Default

    my 327 ran for 40 years without having to tear apart any part of the block EVER. 2 bolt main. ended up rebuilding it because of loss of power...which was to due the valve seats being very pitted from todays gas. but the bearings looked perfect, pretty amazing if you ask me.

  10. #8
    Hondo Jet blown540's Avatar
    Join Date
    Feb 2008
    Location
    Holland, Mi
    Posts
    120

    Default

    Quote Originally Posted by 71hallett View Post
    Hey Blown540, What heads are those?
    Slightly ported Dart 360's
    Last edited by blown540; 09-20-2008 at 01:01 PM.

  11. #9
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Looks good. Now you just need to cut the seats back. J/K
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  12. #10
    Choking my ....... beerjet's Avatar
    Join Date
    Jan 2008
    Location
    Rancho Cucamonga
    Posts
    355

    Default

    I've been flat footing a 425 HP at 5k -52000 at the circle races for a couple of years now . This motor was old when I bought it and it's all stock shit inside . 600 ponies sounds about right for a safe cieling .

  13. #11
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Just remember...if you switch to studs, have your main bores checked. The're probably not going to be round any more.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  14. #12
    Half a bubble off jrork's Avatar
    Join Date
    Dec 2007
    Location
    Silverdale, Washington
    Posts
    2,467

    Default

    Quote Originally Posted by steelcomp View Post
    Just remember...if you switch to studs, have your main bores checked. The're probably not going to be round any more.
    Hey Scott, based on your experiance has the switch to studs on a 2-bolter significantly changed things so you have to take a significant amount of metal out to get them round again or does it "typically" take just a touch up like a light line-hone??

  15. #13
    Super Moderator HammerDown's Avatar
    Join Date
    Dec 2007
    Location
    The Right Coast/SE-PA
    Posts
    5,488

    Default

    Quote Originally Posted by 71hallett View Post
    Word is that a studded 2 bolt is as strong as a stock 4 bolt..../
    Uh, where did you hear that?
    I was told (local engine shop) even a "studded" 2-bolt could walk the caps in a 650 HP application.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  16. #14
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default

    I read somewhere on here, that boats are a lil different than cars in this area, in that there not getting shock loaded, like dropping the clutch in a car.
    Another Hot Boat refugee

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95