82 Daytona - how good is this outdrive?
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82 Daytona - how good is this outdrive?

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    Senior Member rpm0414's Avatar
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    Default 82 Daytona - how good is this outdrive?

    Looking at picking up a Eliminator Daytona 21, found pretty nice project. Hull is perfect and new interior, just no motor. So the outdrive is an old OMC , how much power can I put to that thing? My last boat which I still have is a 76 sleekcraft aristocrat which has a Berkeley jet. NOT familiar with any outdrives, whats the verdict??

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    Senior Member H20MOFO's Avatar
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    The OMC I owned was about as stout as a soda cracker.
    Another Hot Boat refugee

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    Senior Member stoker2001's Avatar
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    Quote Originally Posted by rpm0414 View Post
    Looking at picking up a Eliminator Daytona 21, found pretty nice project. Hull is perfect and new interior, just no motor. So the outdrive is an old OMC , how much power can I put to that thing? My last boat which I still have is a 76 sleekcraft aristocrat which has a Berkeley jet. NOT familiar with any outdrives, whats the verdict??
    call Drew at Boatmasters,He is more in tune,but I have seen those 800 series OMC drives work behind 500+HP nitrous small blocks in 19 and 21 daytonas,granted they might have a few mods to them? 925-443-5775
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

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    custom member raped southwind's Avatar
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    I made it 1 trip with the o/c and then broke the drive the next 3x out. Made the decision to convert to a jet that much easier!

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    Senior Member stoker2001's Avatar
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    Its a lot of time and money to convert to jet IMO.If you are a jet guy,i would sell this boat and get a tunnel jet,just my $.02
    If you took the I/O and surfaced it (propshaft level with bottom) with a 500HP small block =100mph all day long..just saying
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

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    Senior Member rpm0414's Avatar
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    So what does that entail making it level to the bottom? And with a 500hp LS what combo will be faster? Jet or cobra??

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    Senior Member f_inscreenname's Avatar
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    Quote Originally Posted by rpm0414 View Post
    So what does that entail making it level to the bottom? And with a 500hp LS what combo will be faster? Jet or cobra??
    Jets are always slower because of the inefficiencies.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
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    Senior Member stoker2001's Avatar
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    Quote Originally Posted by f_inscreenname View Post
    Jets are always slower because of the inefficiencies.
    what he said,especially if you semi surface the outdrive/prop
    not sure on that Cobra outdrive,but the older 800 series OMC I/O was relatively easy to raise the drive cause it was directly bolted/coupled to engine (unlike typical merc/bravo drive) where as you raise/jack the whole motor and drive together,with minimal transom cutting/modsgoing from one extreme to the other on a 19 or 21 Daytona can net huge top speed gains and lower prop slip #s
    Whacker Smacker M/E #561 IHBA "first looser"champ 2006&2007&Sportsman Driver of the Year

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    If it's the OMC King Cobra outdrive, they're pretty nice drives. My dad had one for years with a 468 Ford in front of it (approx. 500hp) on a heavy 22' deep V - never had a problem with it that I can remember.

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    Diesel Pimp WINspeed's Avatar
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    There is a bunch of OMC outdrive Daytona's in the Redding/lake Shasta area. Most run 100+, but they do break on occasion. All of them will say that outdrive is the weak link. But at the same time they makes fun of the Jet guys up there.

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    Lurker Tahiti350's Avatar
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    I was running a solid 340 hp through an OMC 800 in an 18' Tahiti ST, ran it for years beat on it pretty hard and never broke the drive. Ran an honest 70 on GPS, but was a handfull getting it there. Had to be light on fuel (bow tank), alone and willing to trim through the chine walk...
    1983 DiMarco 7/8 runner bottom, BBC (coming soon).

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    kenny nunez
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    Default Omc 800

    I was OMC dealer from 72-03. The biggest problem was keeping water out of the upper case. The 800 has to have the "negative angle" clutch dog and matching gearset, otherwise it will not hold.Make sure the shift interupter system is working. Changing the shift cable is a PITA. Make sure the engine mounts are secure to the stringers.
    The Cobra series was a big improvment in durability and as you know when Volvo took over things got even better.

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    I know this is an older thread but i'm actually thinking of purchasing a Daytona Eliminator for my 505 BBC. It's currently in a jet boat but my question is, 600hp in a 21' Daytona Eliminator outdrive vs jet: advantages and disadvantages? Top Speed, Accelaration etc. Also, what is the cost of a daytona without an engine?

    Thanks guys

  16. #14
    Cocoloco cocoloco's Avatar
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    Default Big or Small block...

    Had a 24 Formula with an OMC, "Oh My Checkbook". The boat came with a small block and I never had a problem. I stuck a 468 in it and the parts parade began. Changing props, angles and surfacing did little to stop the carnage. It was my ultimate determination the amount of brute torque the BBC put on the drive was the problem. So I went to the garage O racing parts and built a 400 small block that probably made 450HP from the numbers others I had built made on the dyno. Put it in the boat with a different prop and achieved the same MPH as the BBC but stopped breaking gears and shafts. The boat wasn't as quick to plane but that had to be attributed to the lack of brute torque was my estimation. I know he won't remember but Stoker actually gave me some advice on the prop at the time over at his shop.

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