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dyno'd boat engines /now im disapointed

Discussion in 'General Recreation' started by dmaxx3500, May 9, 2008.

  1. dmaxx3500

    dmaxx3500 Deputy

    3,204
    3
    May 3, 2008
    chicago,
    just talked to the eng dyno guy and he's run in 2 of the 3 588'' 750 hp engines and he says they run great ,but they only make 739 and 735 hp ,he's going to run the 3rd one when i get there tomorow,,im disapointed as i thought they would run better then when they were first built in 1991,,as eng cyl heads have come a long way since then,,

    eng specs
    588'' cu in,4.5 stroke x 4.560 bore
    carilio h-beam rods
    cola cranks
    gm tall deck bowtie blocks
    venoilia 9.6 to 1 comp pistons
    solid roller cam.734 lift,274/286 dur
    dart pro 1 heads 340 cfm/rech prots 2.350in/2.19exh
    edlbrock single plane intakes
    1250 dom holley carbs
    thundervolt 4 ings with v6 modules

    engs make good power up to 6500rpm
    any ideas why these don't make 800+hp,thats what i was told to expect
     
  2. eng158

    eng158 Deputy

    726
    0
    May 5, 2008
    NY
    oh that sux, ONLY 735 HP, lol. i think it is time to upgrade than to ones that put out over 750.
     
  3. Cheyenne19

    Cheyenne19 Special agent C19 A(ACLU)

    540
    0
    May 4, 2008
    The Delta
    Don't know. It sounds like it should be there.
    I'm running a tall deck in mine too. That .250" longer rod helps dwell time and makes lot's of torque. My only guess would be possibly the cam. You could go with a little more lift and duration. With that many cid and carb on it, it might wake it up more. I'm not that familiar with those dart heads either, I'm running Brodix bb2+ in mine. But I am running a Dart intake.
     
  4. dmaxx3500

    dmaxx3500 Deputy

    3,204
    3
    May 3, 2008
    chicago,
    i watched the 3rd one run yesterday and im going to just put these in the boat and give up,everyone and everything ive read says these should make 800+ hp
     
  5. Gruber

    Gruber Tin Can Rider

    504
    0
    May 4, 2008
    1000 Oaks, California
    dmaxx....735hp is a lot of horses! Sounds like you are disappointed that you didn't get 800hp............I guess now it's going to be all about how fast the boat/boats go.........Good luck I hope they go as fast as you want them too!:)
     
  6. gc427

    gc427 Diesel Mark

    64
    0
    May 4, 2008
    Anaheim, CA
    Congrats on your 2 engines!:hurray:

    The horsepower numbers might seem a little bit shy of your goal.

    I don't thin the numbers are too bad considering the compression ratio.

    I do think that the camshaft looks to be way to small for top horsepower numbers with an engine of that displacement. Talk to another engine builder or call a good cam company.

    BTW, what kind of torque numbers and curve did they produce?

    Sometimes big horsepower numbers don't always produce the best speeds.
     
  7. whitetrash21

    whitetrash21 Put on the damn helmet day........

    788
    0
    Apr 29, 2008
    Vegas
    blowers are your friend.....
     
  8. Cheyenne19

    Cheyenne19 Special agent C19 A(ACLU)

    540
    0
    May 4, 2008
    The Delta
    I don't know what I was thinking when I typed that, it's a .400'' longer rod. Don't :banghead:. You're getting close to your goal. I'd have guessed that they would have made it as well.
     
  9. Unit453

    Unit453 Cruises comfortably at 140... Staff Member Administrator

    7,123
    1
    Feb 10, 2008
    Bradenton, FL
    As if motors over 700 h.p. really need blowers...:eek:
     
  10. dmaxx3500

    dmaxx3500 Deputy

    3,204
    3
    May 3, 2008
    chicago,
    torque was about 720 on all 3, yes i was hoping for 800,all 3 were within 10 hp and 5ftpds of torque,i talked to the eng builder and these are going back to try again next week,[dif cams and or timing,diff carbs or more rpms ,etc],,and blowers work great if you need more power on these [upwords of 1000hp-1400hp],ill keep you guys posted
     
  11. whitetrash21

    whitetrash21 Put on the damn helmet day........

    788
    0
    Apr 29, 2008
    Vegas
    no such thing as too much power.... :ciappa:
     
  12. Cheyenne19

    Cheyenne19 Special agent C19 A(ACLU)

    540
    0
    May 4, 2008
    The Delta
    I feel like the cam is going to be the secret. It might be the weak link in the setup. More duration and lift should help you take advantage of the inches and heads. But then again I'm not an engine builder.
     
  13. gc427

    gc427 Diesel Mark

    64
    0
    May 4, 2008
    Anaheim, CA
    AGREED!:iagree:
     
  14. 66FLH

    66FLH "The Big Kahuna"

    943
    0
    May 7, 2008
    New Mexico
    Get some hours on those badboys and I can almost guarantee they'll loosen up with 10-15 more horses!
     
  15. dmaxx3500

    dmaxx3500 Deputy

    3,204
    3
    May 3, 2008
    chicago,
    we talked to comp cams today and they want us to retard the cams 4 degs,and run 4 degs more timing,they think it will unlock 30-50hp,but ive never seen that from these small changes,,but since im not paying for it ill try anything
     
  16. Gruber

    Gruber Tin Can Rider

    504
    0
    May 4, 2008
    1000 Oaks, California
    Yup! There's always gonna somebody with more HP and a little bit faster, unfortunatly! Nothing is worse than being beat by a fender or in this case a bow length!
     
  17. Cheyenne19

    Cheyenne19 Special agent C19 A(ACLU)

    540
    0
    May 4, 2008
    The Delta
    How much overall timing are you running? Retarding the cam should move you up in the RPM range right?
     
  18. BigBlueBurban

    BigBlueBurban Umm no...WAIT...yes

    98
    0
    May 7, 2008
    Grand Rapids, Michigan
    First thing that came to my mind was the cam - looked a little mild (duration) for 800hp. Look into Lunati cams as well. BTW, what are these going in?
     
  19. Cheyenne19

    Cheyenne19 Special agent C19 A(ACLU)

    540
    0
    May 4, 2008
    The Delta
  20. dmaxx3500

    dmaxx3500 Deputy

    3,204
    3
    May 3, 2008
    chicago,
    there going in a 42' cigarette revolution that weighs 12,500 lbs,,there are 3 of these and it should run 100+ mph,,the yellow and blue one in the first pic is a 35' mistress that has 2-454 efi engines and it should go 65-70 mph
     

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