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  1. #1
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    History of the Merc Speedmaster Racing lower unit

    Who can name this lower unit EXACTLY? From this image tell us the year this was made, gear ratio, rotation and the motor it fits on.

    When the guessing is finished I (or DaveS) will explain how you can tell all the details.

    DaveS knows, so he can wait for the guesses before he tells us. Raceman may know, but might be short one detail.
    Attached Thumbnails Attached Thumbnails racinglowerunit#1.jpg  
    Last edited by Mark75H; 04-07-2009 at 04:14 PM.

  2. #2
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    There are a few details that might be hard to make out on some monitors, I will answer questions about specific details that identify this unit.

    Should I answer questions that don't help?
    Should I tell whether or not a question is one of the critical identifiers?

  3. #3
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    Smile name that gear case

    Is that a screw in nose? Could it be a BP gear case?
    [SIGPIC][/SIGPIC]

  4. #4
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    I know it is not a BP, as someone else guessed. It is a Speedmaster, not a Super Speermaster, although I do not know it's exact name. The shear pin hole is one giveaway.


    Probably 1 to 1?

    Joe

  5. #5
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    1:1 pre-SUPER Speedmaster is correct so far. This unit was just called a "Speedmaster", so Joe is 100% correct on the name.
    The shear pin is one of the critical identifiers.

    How about the year, rotation and what motor it was made to fit?

  6. #6
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    wild guess here...

    just a guess.. im gonna say left hand rotation from a kc-13 (or sumthin like that)

    am i close?? lol

    scott
    "If everything's under control, you're going too slow"
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    76 vixen,.. on the back burner
    82 laser comp. 380 ray

    PICS OF THE VIXEN REBUILD

  7. #7
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    Looks like the one I put on my 1970 1350.

  8. #8
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    1963 Merc 1000?

  9. #9
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    Well, I thought I would cheat and use my Merc electronic parts catalog but it doesnt show pictures of older parts,only part #'s. If I was at the store I could find it in my really old paper parts book. So I have to give up or make another guess,60-61Merc 800 full gear shift.

  10. #10
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    OMC made no racing equipment from 1941 until 1967. While Stephen Briggs controlled OMC this was the law. As Ralph Evinrude took over in the 60's things lightened up.

    This lower unit is a Merc.

    All of the older Merc Speedmasters and Super Speedmasters are 1:1, the 13:16 and 15:16 Super Speedmasters weren't made until the mid '70's.

    If I tell Magic Float the 800 FGS didn't start until '61 and that it isn't exactly the right one, he will get it right by guessing the answer. The real answer is how you can tell it is that motor and not another similar motor made the same year.

    OK can anyone tell me why it doesn't fit a 1963 1000 or a 1970 1350 and the rotation?

    (Besides Magic Float and DaveS that is.)

  11. #11
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    OK, I can't post any images right now, the server is misbehaving.

    speedmasterkey
    Last edited by Mark75H; 10-18-2003 at 10:52 PM.

  12. #12
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    Well, the shear pin in the prop shaft dates it, I'd say back when we were fooling with Black Jack in Outboard Drags...Twin Merc 1000's on a flat bottom....Quicy third ported Black Jack's 1000 in '61. I'd say Merc 1000, 1961 ish!!! (There were rights and lefts but no three blade props...these were racing props...and god knows racing props don't have three blades!!!!)...

  13. #13
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    Still can't post images, when I can I'll post a 100 hp Speedmaster next to this one so you can see the difference.

    So, that means Ron is off a little, too, its not a 100 hp Speedmaster.
    Last edited by Mark75H; 11-30-2002 at 07:10 PM.

  14. #14
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    Sam, question for you. You mentioned both 13-16, and 15-16 ratios. I never have never heard of a 15-16, but owned both 13-16, and 14-15 ratio Super Speedmasters with my TIIX's.

    Was the 15-16 a misprint, or is my memory going away allready?

    Joe

  15. #15
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    Was it ever used in the 90 ci class (UI Class) ?
    MN

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