Alpha 1 Outdrive
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Alpha 1 Outdrive

  1. #1
    getting the itch. GULLWINGDAV.'s Avatar
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    Default Alpha 1 Outdrive

    ANYBODY KNOW ANYTHING ABOUT OUT DRIVES???????????? WHAT I WANT TO KNOW IS --- HOW MANY RPMS CAN YOU PUT TO A ALPHA 1???? AT WHAT POINT IS THINGS GONNA START COMING A PART??? HAVE BEEN TOLD THAT 400 - 425HP IS ABOUT THE MAX FOR THAT DRIVE, BUT DONT HAVE A CLUE ON THE RPMS. EXAMPLE --- MY FRIEND MATT HAS THAT BAJA WITH A 350/ALPHA 1 COMBO. THE BOAT IS REV LIMITED WITH A MSD, BUT WITHIN FACTORY SPES 4200-4500. JUST WONDERING IF THE OUT DRIVE COULD HANDLE CHANGEING THE REV CHIP TO A 5500?????????

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    Hydro Pilot amatosanger's Avatar
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    Quote Originally Posted by GULLWINGDAV. View Post
    ANYBODY KNOW ANYTHING ABOUT OUT DRIVES???????????? WHAT I WANT TO KNOW IS --- HOW MANY RPMS CAN YOU PUT TO A ALPHA 1???? AT WHAT POINT IS THINGS GONNA START COMING A PART??? HAVE BEEN TOLD THAT 400 - 425HP IS ABOUT THE MAX FOR THAT DRIVE, BUT DONT HAVE A CLUE ON THE RPMS. EXAMPLE --- MY FRIEND MATT HAS THAT BAJA WITH A 350/ALPHA 1 COMBO. THE BOAT IS REV LIMITED WITH A MSD, BUT WITHIN FACTORY SPES 4200-4500. JUST WONDERING IF THE OUT DRIVE COULD HANDLE CHANGEING THE REV CHIP TO A 5500?????????
    Dave I gotta chime in and tell you that Alpha 1 drives suck big time......my pops has one on his 27ft 330hp Baja.......he has blown it up 2 times with just stock power.......IMO no good, not worth the trouble. Get a Bravo instead.
    SANGER BOATS

  4. #3
    Senior Member OLD MAN ON THE LAKE's Avatar
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    Quote Originally Posted by GULLWINGDAV. View Post
    ANYBODY KNOW ANYTHING ABOUT OUT DRIVES???????????? WHAT I WANT TO KNOW IS --- HOW MANY RPMS CAN YOU PUT TO A ALPHA 1???? AT WHAT POINT IS THINGS GONNA START COMING A PART??? HAVE BEEN TOLD THAT 400 - 425HP IS ABOUT THE MAX FOR THAT DRIVE, BUT DONT HAVE A CLUE ON THE RPMS. EXAMPLE --- MY FRIEND MATT HAS THAT BAJA WITH A 350/ALPHA 1 COMBO. THE BOAT IS REV LIMITED WITH A MSD, BUT WITHIN FACTORY SPES 4200-4500. JUST WONDERING IF THE OUT DRIVE COULD HANDLE CHANGEING THE REV CHIP TO A 5500?????????
    Alpha drives will take lots of RPM.What they won't take is torque.
    I have put 400+hp in a couple boats successfully.(20ft searay/20ft spectra)with no problems.
    Be careful with them and they will live.Do not stand on it from the start and don't fly the boat.
    Your buddy's 350 probably runs out of torque well before 5500.I would check that before you change anything.I would guess 4800 without modifications.
    My spectra runs in the mid 60s with 400+hp sbc 21p Revolution [email protected] 5100 rpm. Empty.
    Hope this helps.

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  6. #4
    getting the itch. GULLWINGDAV.'s Avatar
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    Just curious. Nothing I want to get into. It seems like the boat had more, but rev. limited to low. Thanks guys.

  7. #5
    Boat Nut sleekcrafter's Avatar
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    HTM Tom has a take off bravo unit, was replaced with a XR drive. I can check into it if your interested Dave. Reason for for up grade was carb'ed 572BBC replaced the 502EFI.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  8. #6
    No Sandbar To Far sanger rat's Avatar
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    Put a surface drive on there and be done with it.
    Quote Originally Posted by One More Year View Post
    The only blab's I will even be a part of is just when it is me they are talking about. Aaaah yes I can see a few good looking shiny tall deck motors on the beach, with barely enough fuel to get back to the launch saying, "Holy crap how fast you think that Daytona was going man? That's like the 20th time he's gone by today?"

  9. #7
    MAD FABRICATOR wirsboguy's Avatar
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    Default alpha drive

    It's not so much the rpm but the torque you put to it. I have rebuilt many drives and most are do to "holeshots". Stock Bravo's are good to 500 hp, But will not last if you are hard on it out of the hole. An xz or xr is a much stonger unit, it has Hardened shafts and gears, Also the xz is a straight cut gear, not helical. You might want to consider a drive shower as well. They help keep the drive cool when on plane.

  10. #8
    Senior Member GT Jets's Avatar
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    The weakest link IMO is the upper gearcase and more accurately the top bearing, IMO undersised and under lubricated, one thing you can do to improve the durability is to increase the oil passage hole size in the cover, not too big, just a couple of number drill sizes, the next thing is good oil, I have been running Amsoils heavy duty synthetic GL-5, 75-90 for 10 plus years and have yet to have an oil related failure, the next issue would be too much heat in the top of the O/D, a drive shower is simply a must....

    The last thing I recommend is to pick up the Quicksilver oil reservoir kit, at the least it gives you is a oil level correction when hot/cold, and prevents foaming of the oil due to low levels.

    Our little shop has been putting in the ZZ4 crate motors from GM Performance Parts and did these few mods and have not had a single issue.

    It is very important to have the bearing preload on the top bearing absolutely dead on, otherwise plan on a failure, I don't think 400-450 hp will destroy one of these drives unless they are absolutely abused, as far as rpm, I don't ever recommend more than 5,200 RPM due to the horrible lubrication design of the drive and piss poor water pump design, IMCO or someone may build a better upper GC but have not played with one...Yet...

    GT

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    Good thing mate...
    Thanks for the info..

  12. #10
    BIGJOEDUCKSLAYER BIGJOEDUCKSLAYER's Avatar
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    I spin mine above 5k all the time, I have not had drive fail because if abuse yet. twin sbc about 400hp well maybe a little less
    BIG JOE SSMF When it rains, we pour


  13. #11
    MAD FABRICATOR wirsboguy's Avatar
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    Default New Bravo 1

    I have a new, still in the box Bravo 1, If your interested.
    "I'M NOT CRAZY,,,, BUT I MAY BE A CARRIER"

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    Have you ever had problem with the clutch slipping on a gen 1. I have melted a prop hub and shattered one in 6 hrs of drive time with 383sbc 375-400 hp due to the clutch slipping out and in forward above 3500rpm.

  15. #13
    Bah... HST4ME's Avatar
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    Quote Originally Posted by Sbc383 View Post
    Have you ever had problem with the clutch slipping on a gen 1. I have melted a prop hub and shattered one in 6 hrs of drive time with 383sbc 375-400 hp due to the clutch slipping out and in forward above 3500rpm.
    There is no clutch to slip, they are a clutch dog mechanical style lower just the same as an outboard. If you are getting "slippage" it is due to the plastic "flo broq" drive sleeve being broken in the prop hub, and/or if your in party mode and hopping waves even the gen 2's will not hold up to that HP level. Even the the new coarse gears will split the pinion in short order. None the less the part # for the HD hub kit is 835258k 2. And as fair warning what you will find is the upper will distort around the pinion bearing housing with repeated abuse. The gen 1 (MR) alphas are only good for 300 hp under careful use.
    Last edited by HST4ME; 07-17-2014 at 05:31 AM.

  16. #14
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    I have an Alpha 1 drive behind my 19' Baja with a 400" small block since new in 1986. I had the dealer swap out the standard 1.5 gears for the flat cut 1.32 ratio gears that also use different heavy duty bearings. I was told the 1.32 gear set was developed to handle the new at the time 330 hp efi motor. At the same time I installed the same engine in my neighbors 21' Baja with stock 1.5 ratio gears (we ordered the boats together). Both boats were tuned for max power at 5,200 rpm. My boat with the 1.32 ratio gears needed a much smaller pitch prop to compensate for the different gears. The neighbor sold his boat after about 10 years of heavy use without any problems. I still have my combination and never had an issue. The 1.32 gear set has a unique sound similar to the old "rock crusher" 4 speed transmission due to the flat cut gears. Not objectionable, just different. You might want to install the HD gears to beef your drive up. Just be prepared to change the prop as well.

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