Max hp on a mark IV bowtie block(cast caps)
+ Reply to Thread
Page 1 of 7 1 2 3 4 ... LastLast
Results 1 to 14 of 98

Thread:
Max hp on a mark IV bowtie block(cast caps)

  1. #1
    Member
    Join Date
    Aug 2008
    Posts
    96

    Default Max hp on a mark IV bowtie block(cast caps)

    What is the max hp you have put to a IV bowtie block(cast cap).What was your engine sc ,turbo .nitrous.With a straight bolt pattern does it still help to go billet caps?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member CNC BLOCKS's Avatar
    Join Date
    Sep 2009
    Posts
    133

    Default

    Quote Originally Posted by fuelcustoms View Post
    What is the max hp you have put to a IV bowtie block(cast cap).What was your engine sc ,turbo .nitrous.With a straight bolt pattern does it still help to go billet caps?
    On some of those blocls we have seen the webbing crack because of a step to narrow the webbing by the outter bolt holes.

  4. #3
    mo balls than $cents$ IMPATIENT 1's Avatar
    Join Date
    Dec 2007
    Location
    hugo,okla
    Posts
    11,733

    Default

    Quote Originally Posted by fuelcustoms View Post
    What is the max hp you have put to a IV bowtie block(cast cap).What was your engine sc ,turbo .nitrous.With a straight bolt pattern does it still help to go billet caps?
    mark 4 half filled block with studded 4bolt cast caps and pushing well over 1600hp twin turbo blow thru 496 and nooooooo signs of cap walk or distortion yet unc tore it down over the winter and bearings looked new

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,813

    Default

    Quote Originally Posted by IMPATIENT 1 View Post
    mark 4 half filled block with studded 4bolt cast caps and pushing well over 1600hp twin turbo blow thru 496 and nooooooo signs of cap walk or distortion yet unc tore it down over the winter and bearings looked new
    Stud kit being the key!!!

  7. #5
    Gone
    Join Date
    Dec 2007
    Location
    Sparks, Nevada
    Posts
    1,824

    Default

    Quote Originally Posted by IMPATIENT 1 View Post
    mark 4 half filled block with studded 4bolt cast caps and pushing well over 1600hp twin turbo blow thru 496 and nooooooo signs of cap walk or distortion yet unc tore it down over the winter and bearings looked new
    whose crankshaft?

  8. #6
    Senior Member EVILFORCE's Avatar
    Join Date
    Oct 2009
    Posts
    5,180

    Default

    Quote Originally Posted by Fiat48 View Post
    whose crankshaft?
    GOOD Question. I have seen them pushin about 2000 hp. I bet they could go more with all of the right parts.
    No Fool Like A Old Fool is there?

  9. #7
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Crank stiffness is a big factor. But I think stroke and RPM play a big part. Those stock blocks move around alot. Even with a good crank, if the block flexes in really does't matter. things just no longer line up. Detotnation will tear one apart faster than horsepower.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  10. #8
    Senior Member wizbang's Avatar
    Join Date
    Feb 2008
    Location
    Kent, WA
    Posts
    1,485

    Default

    Quote Originally Posted by gn7 View Post
    Crank stiffness is a big factor. But I think stroke and RPM play a big part. Those stock blocks move around alot. Even with a good crank, if the block flexes in really does't matter. things just no longer line up. Detotnation will tear one apart faster than horsepower.
    Thats for sure !

    Puddingstone was not pretty for us

  11. #9
    i'm back!! 1QuickCP's Avatar
    Join Date
    Jun 2009
    Location
    Montana
    Posts
    687

    Default

    Depends on so many factors and application, i've seen 4.25 stroke move caps all over the place at around 1400 hp in drag deal, seen one actually break the caps off at the webs at around 1800 in mild Blown alky deal in dragster. (that motor dynoed perfect btw and had been run at less boost for some time,freshned and stepped up..boom)

    IMHO is you are building something over 1500 hp you really need to run the best block possible, I have great luck with the cross bolt 6-bolt main KB olds style...just a nice block,and will live.

  12. #10
    Member
    Join Date
    Aug 2008
    Posts
    96

    Default

    Quote Originally Posted by 1QuickCP View Post
    Depends on so many factors and application, i've seen 4.25 stroke move caps all over the place at around 1400 hp in drag deal, seen one actually break the caps off at the webs at around 1800 in mild Blown alky deal in dragster. (that motor dynoed perfect btw and had been run at less boost for some time,freshned and stepped up..boom)

    IMHO is you are building something over 1500 hp you really need to run the best block possible, I have great luck with the cross bolt 6-bolt main KB olds style...just a nice block,and will live.
    Since those motors where blown and say it took 400 hp to turn the blower to make 1800 hp .would it be the same stress on the block a 2200 hp turbo motor Since it doesn't having the blower robing hp?

  13. #11
    i'm back!! 1QuickCP's Avatar
    Join Date
    Jun 2009
    Location
    Montana
    Posts
    687

    Default

    well, id say ur correct, lets say tho about 200 to turn these blowers, not running anywhere near 40 psi to make 1500. And I believe turbos are better on parts than superchargers (imho)

    I just look at stuff this way (probably from owning a shop for so long) My standard is to always build a margin of safety in a customers motor, ie overkill, so if you walked in and told me you wanted 2000 hp you are geting a kb olds block, 3" main billet crank,oliver billet rods, 1" jesel lifters,ect ect etc and if you dont want to build it that way I would not do the motor. (we were always packed with work) Its just that I like stuff never to break when my names on it. Likewise with customer supplied parts...not gunna happen.
    Im not saying its right im just saying thats the way I do stuff. I would much rather a customer build on a fixed budget and have a nice lower hp motor that is correct for the application than a stressed on the limit deal.

  14. #12
    Member
    Join Date
    Aug 2008
    Posts
    96

    Default

    Makes since ,thanks

  15. #13
    Senior Member shan's Avatar
    Join Date
    Jan 2008
    Location
    Yuma
    Posts
    1,832

    Default

    Quote Originally Posted by gn7 View Post
    Crank stiffness is a big factor..
    Just curious, how would you change (from a production crank) the crank stiffness? Are you talking about bending stiffness or torsional stiffness? I assume bending, although it doesn't matter.
    Last edited by shan; 07-17-2010 at 11:39 AM.

  16. #14
    Resident Ford Nut Sleeper CP's Avatar
    Join Date
    Dec 2007
    Location
    San Diego County
    Posts
    10,072

    Default

    Quote Originally Posted by shan View Post
    Just curious, how would you change (from a production crank) the crank stiffness? Are you talking about bending stiffness or torsional stiffness? I assume bending, although it doesn't matter.
    Not going to, the stiffness comes from the Forging ( material used and density).

    My 513" Ford with an off-set ground stock crank ran for 2 yrs with a 200hp nos kit, total 900 hp. Had the crank checked and it was perfect. The Ford nodular iron forgings are damn stout. I was told not to push the stock crank that far by a couple of people (chevy guys) but two Ford guys told me " No problem". I've often wondered if a jet boat is less abusive on blocks and cranks than a drag car with 12" slicks leaving the line. I would guess they are, the boat wouldn't have that "shock" hit like a drag car would have.

    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

+ Reply to Thread
Page 1 of 7 1 2 3 4 ... 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

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