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  1. #11
    Registered Brad Zastrow's Avatar
    Join Date
    Jun 2001
    McHenry, Illinois
    I had transmissions, converted to crash boxes after blowing transmissions and have since switched back. I could not see any performance difference but have been told crash boxes are a few mph faster. The docking with crash boxes was a bit tricky but I never had an issue. I just wanted the boat to be more user friendly.
    I now have Ateco rebuild my transmissions once a year and have not lost one yet.

  2. #12
    Platinum Member Platinum Member Steve 1's Avatar
    My Boats:
    Slippery when wet!
    Join Date
    Apr 2001
    Beautiful Fort Lauderdale
    Quote Originally Posted by HabanaJoe View Post
    Steve 1 - very astute remark

    If it makes enough heat to need the oil cooled it's taken some Hp to make that heat - the more cooling the more Hp - good analogy!

    Sir yes Thank you.
    Slippery when wet. "POD" Free Tunnel through Common Sense Engineering

  3. #13
    Gold Member Gold Member h2oboater's Avatar
    My Boats:
    1973 Donzi X-18 1975 Donzi Doral 1973 Magnum Sport 1973 Sedan Magnum & SMIDGEN Too 1975 24' Cobra
    Join Date
    Dec 2003
    NewBaltimore Mi
    Quote Originally Posted by wjb21ndtown View Post
    I can't see that being the case. To the best of my knowledge a trans usually only eats about 35Hp. Boat transmissions are pretty basic, especially compared to automotive transmissions with multiple gears. You really think a Corvette or Mustang stick has an extra 100hp over an automatic?

    Everything I've seen and know suggest that it's only about a 25-35 hp loss to run a transmission A crashbox is going to eat something, but given that the total loss is 25-35 the difference in Hp loss is going to be minimal.
    Back in the early 90's APBA changed the rules for D class. We had to switch out our crash boxes to transmissions. [Huber] In testing at Lake X we found we lost nothing in speed with the Eastern Express Skater.

  4. #14
    Offshoreonly Advertiser Offshoreonly Advertiser Mbam's Avatar
    My Boats:
    1972 Cigarette 36 race
    Join Date
    Mar 2001
    Pompano Beach FL, USA
    We measure the loss on evey one we build

    Measured at 5000 RPM, our standard is 12-14 ft lbs, our dry sump is 8-10 ft lbs. A stock velvet drive is 15-20

    And a crash box is about 2 ft lbs. So the percentage differance is large, but it is still a pretty small number.

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