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Thread: need advice on (re-)shaping old bronce props

  1. #21
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    Relying on water being thrown into it by the prop has not worked for me (at least). Motor overheated very rapidly with the cav plate just under 4 inches up. Was fine at 3 inches up.

    Going to put the inlet on the boat and pipe the water to the LU.

    Jeff
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    "We live at the bottom of an ocean of air." - General Marvage Slatington

  2. #22
    Team Member smittythewelder's Avatar
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    Quite an experiment!! That it didn't work out takes away nothing from the attempt.

  3. #23
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    well, need to take some photos...

    Quote Originally Posted by smittythewelder View Post
    How about cutting off the entire projecting part of the water pickup and cap it off, by welding or just drilling and tapping for a thin plate (with gasket or sealant). Then rig a water pickup like I was talking about, and run a tube around the side of the towerhousing, above the cav-plate, and entering a drilled hole outside of the now-capped-off factory water passage. Obviously this would send water to the pump.
    this sounds similar to what i planned. There is a sump below the pump, where the original intake tube ends. i can bore a hole from the side into it for new water feed, and also plug the original tube.
    You haven't said what the motor is. I'm just guessing that it does have an actual pump somewhere up in the towerhousing. At least one of the race motors, the Yamato 80, has a pickup roughly similar to what you drew, but with no pump, relying on water being thrown into it by the prop.
    sorry... it's a König 2cyl, 30-40HP. It is the same brand that also made the racing motors, but my motor is from their standard (fishing/sports/touring) line. Compared to the racing engines, it spins rather low at just ~5000. And yes, it does have a pump (and reverse gear)

    Does the gearcase on your motor split along the centerline of the propshaft, or is it one-piece with the gears and shaft loading into it from the back?
    unfortunately, it does split. So no way to mount a "traditional" nose cone with LWP.

    Jeff- very nice piece! But when you mount it on the transom, i think you should mount it rather behind than below the transom edge, so that the intake's blund leading edge is above the water..?

    regards

  4. #24
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    That's my thinking as well. Gonna mount it on the starboard trim tab, with an extension long enough to always get water.

    Jeff
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    "We live at the bottom of an ocean of air." - General Marvage Slatington

  5. #25
    Team Member smittythewelder's Avatar
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    Jeff, what IS that boat?!! Looks like a super wake-jumper. Puget Sound has a fair amount of big ship traffic, sending big rollers across the water, wake-jumping heaven, get all the air you dare.

  6. #26
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    Don't jump them anymore--too old for the impacts--but I sure love to wake surf! Boat is very maneuverable and does that very well.

    Jeff

    PS: Been doing this stuff in homemade 8 to 12 footers for 60 years starting next year!
    "We live at the bottom of an ocean of air." - General Marvage Slatington

  7. #27
    Team Member smittythewelder's Avatar
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    Woulda thought that with such a deep vee, the boat would hit pretty easy . . .

  8. #28
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    It also has a 10.5 inch wide pad down there (not visible in the photo).

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington

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