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Thread: BP motors

  1. #1
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    BP motors

    Was anyone able to successfully shift a running BP motor from forward to reverse and back again? I saw them checked on inspection with the motor dead for operation but I never saw one shifted while running. To be fair many of my stock lower unit motors were not shifted either. It would not have hurt the unit but would sink the boat in reverse.

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    Sure. No problem. With a stop in neutral. Standard gearcases lasted longer if locked in forward, was the logic back then. I know this to have merit on offshore boats. Usually true as well on our smaller boats then. On my smaller personal center-steer fast boats, I screwed the shift cable down to the floor, in forward.

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    shifting ....

    Quote Originally Posted by 2us70 View Post
    Was anyone able to successfully shift a running BP motor from forward to reverse and back again?
    define 'successfully' .....

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    Quote Originally Posted by willabee View Post
    define 'successfully' .....
    . The ability to change directions from forward to reverse and still keep all 3 little pinion shafts in one piece.
    2005 APR FORMULA 2 ROOKIE OF THE YEAR

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    shifting ....

    Quote Originally Posted by largecar91 View Post
    . The ability to change directions from forward to reverse and still keep all 3 little pinion shafts in one piece.
    Based on that definition, the answer to the original question is ..... ( a little traveling music please) ..... Nope
    Last edited by willabee; 01-12-2017 at 12:40 PM.

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  9. #6
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    So the BP was built to allow use of a Speedmaster type lower unit in the Sport and Production classes?

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    The BP lower. I herd it said many times the BP stood for BIG PROBBLEMS!
    1994 Brad Collins Mirage Jag.with 1990 2.4 BP E.F.I Offshore

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    Merc shifting speedmaster???
    Only omc had that

  12. #9
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    Quote Originally Posted by powerabout View Post
    Merc shifting speedmaster???
    Only omc had that
    No, you only thought OMC was the only one. The triple pinion Merc BP is the shifting Speedmaster.

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    Quote Originally Posted by 2us70 View Post
    So the BP was built to allow use of a Speedmaster type lower unit in the Sport and Production classes?
    Yes, in 1967-68 the full gearshift OMC GT and X motors that preceeded the BP were built for and allowed in Production and Sport ... the 1968 BP was Kiekhaefer's counter to them, running in the gearshift production/pleasure "fishing motor" classes. I don't know the date, but late in 68 or early 69, both the OMC and Merc shifting race motors were thrown out of the OPC pleasure classes - when out of the OPC gearshift classes, Merc came out with the BP to SSM adapter and that became the normal race configuration.


    Strang claimed the GT & X gearshift motors were intended for Offshore Racing. Offshore didn't automatically throw out the race shifters when OPC did.

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    Someone is probably going to post a picture of the 1969 1250 Super BP with the studs up shiftable case. Yes, that's the preproduction and delivered configuration. The APBA race year starts on November 1; 1969 model year factory output probably started sometime in September. Havasu was just 3 weeks into the APBA race year, so boats running there would be in the following calendar year legal/production set up and there was incentive for Merc to have a lot of available product in accord with November 1 APBA rules.


    Again, I'm pretty certain Offshore rules still allowed the shifter race cases as "pleasure motors" after OPC put them into their own special race class.

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    wow
    thanks Mark 75

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    Quote Originally Posted by Mark75H View Post
    The APBA race year starts on November 1; 1969 model year factory output probably started sometime in September. Havasu was just 3 weeks into the APBA race year, so boats running there would be in the following calendar year legal/production set up and there was incentive for Merc to have a lot of available product in accord with November 1 APBA rules.
    I don't recall ever being checked for 'Legal' equipment at Parker or Havasu--

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    Quote Originally Posted by Mark75H View Post
    Someone is probably going to post a picture of the 1969 1250 Super BP with the studs up shiftable case.
    Don't want to disappoint, Sam--


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    [QUOTE=largecar91;2920384]. The ability to change directions from forward to reverse and still keep all 3 little pinion shafts in one piece
    --------------------------------------------------------------------------------------------------------------------------------------------------------------

    The pinion shafts weren't that little, Barry. Actually they made great chisels, punches, drivers, etc. Shifting the unit with the engine running --especially into reverse--was NOT good---but the problem was in the lower driveshaft needle bearings--as you can see on this driveshaft---I'm sure the engineers were not aware of this----


    Last edited by GENE LANHAM; 01-15-2017 at 09:53 PM.

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