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Thread: Crossover

  1. #1
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    Crossover

    I purchased a Hardin crossover for my 406 to go on 94 18 with ss outdrive. They said ss pump will do the job. A friend who has been a performance boat mechanic for years says he doesn't like crossovers they provide inconsistent consistant cooling. What do you guys think?

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    Sorry

    Inconsistent cooling!!!!!!!

  3. #3
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    Sorry

    With bypass.

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    The Alpha/SS drive raw water pump doesn't have the capacity to operate effectively w/o a circ pump.
    You can do it by doing the following:
    Remove the pump impeller.
    Remove the hose between the drive and the gimbal.
    Block the water connection flange inside the gimbal/inside the hull.
    Add a Stainless Marine transom pickup.
    Add this crank driven raw water pump: http://www.marineexhaustmanifolds.co...ater-pumps.htm
    Plumb the transom pickup to the crank driven raw water pump through all your various coolers.
    This set up works very well, I've done it a number of times.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  5. #5
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    I agree with George that the Alpha won't supply enough water. I wouldn't eliminate it though I would use it for the oil coolers and dedicate the new pickup/crank pump for block cooling. Or even better plumb the Alpha pump to be a drive shower
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



    https://www.facebook.com/photo.php?v...=2&theater

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    Cost

    Is it worth it? That's $1000 in parts!!!

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    Quote Originally Posted by Magnum Ralph View Post
    Is it worth it? That's $1000 in parts!!!
    If you're in a HP race, you'll need more cooling. These are just building blocks.
    But i think it's closer to $600.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  8. #8
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    Attn gcarter

    Could you provide specific part numbers for pump and pickup sbc? Thanks !!!!!!!

  9. #9
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    The pump is a Johnson F6-B9 for $189.00 plus about $30 for a stabilizer.

    The pickup is a



    • 1 1/4″ N.P.T. Male X 1 5/8″ O.D. Stainless Transom Mount Water Pick Up


    $229.00

    1 1/4″ N.P.T. Male X 1 5/8″ O.D. Stainless Transom Mount Water Pick Up
    Standard Transom mounted Water Pickup for larger gas or medium size diesel engines that do not run at high speeds.

    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  10. #10
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    Ralph,

    I used the pickup pictured by George on my Donzi 16. That pickup has a pretty aggressive downward angle. I mounted mine with the leading edge just about flush with the bottom, and found the trailing edge was too deep (it made one of those fake looking rooster tails). Perhaps I mounted it too deep, but I seem to remember I did it according to their instructions.

    I took a straight edge and held it flush against the bottom and drew a line on the side of the water pick up, and cut off the angled part so the outside part was ⅛" below the line I drew. It still had tremendous water flow, and had to be a marked improvement in drag reduction.

    Remember that I had a Volvo drive, which does not contain a water pump like the Mercruisers do, so I already had a crank driven water pump.

    What started this process was that I wanted a smoother drive, so I filled in the water pickups on the front of the Volvo 290, which had been the water source for the engine. With that source gone, I needed a new one, so I purchased the transom water pickup George pictured.
    “Oh right, because you walked into strippers discount warehouse and said ‘Help me showcase my intellect.’” - Archer

    Bill
    Grand Rapids, Michigan
    1985 Donzi Criterion SS
    1967 Donzi 16 Ski Sporter, C16-409, Has a new home!
    38' Carver Aft Cabin
    1968 Sea Ray SRV 180 w/1975 70 hp Evinrude
    10" RIB w/15 hp 1984 Evinrude

  11. #11
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    Quote Originally Posted by Just Say N20 View Post
    Ralph,

    I used the pickup pictured by George on my Donzi 16. That pickup has a pretty aggressive downward angle. I mounted mine with the leading edge just about flush with the bottom, and found the trailing edge was too deep (it made one of those fake looking rooster tails). Perhaps I mounted it too deep, but I seem to remember I did it according to their instructions.

    I took a straight edge and held it flush against the bottom and drew a line on the side of the water pick up, and cut off the angled part so the outside part was ⅛" below the line I drew. It still had tremendous water flow, and had to be a marked improvement in drag reduction.

    Remember that I had a Volvo drive, which does not contain a water pump like the Mercruisers do, so I already had a crank driven water pump.

    What started this process was that I wanted a smoother drive, so I filled in the water pickups on the front of the Volvo 290, which had been the water source for the engine. With that source gone, I needed a new one, so I purchased the transom water pickup George pictured.
    Yes, sometimes adjustments are needed. But, as Bill said, start w/the pickup as it is supplied. On most larger boats, no adjustment is needed. On my TR, I have a water pressure gauge, and it registers about 6 PSI at 50 MPH.
    Also, I don't recommend filling the drive water pickup on a Merc drive as water flow is needed in the upper gear box for cooling. Even w/o the pump impeller, plenty of water will flow through the drive. By removing the connecting hose, water will cool the drive and then dump back into the water.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  12. #12
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    Quote Originally Posted by gcarter View Post
    Yes, sometimes adjustments are needed. But, as Bill said, start w/the pickup as it is supplied. On most larger boats, no adjustment is needed. On my TR, I have a water pressure gauge, and it registers about 6 PSI at 50 MPH.
    Also, I don't recommend filling the drive water pickup on a Merc drive as water flow is needed in the upper gear box for cooling. Even w/o the pump impeller, plenty of water will flow through the drive. By removing the connecting hose, water will cool the drive and then dump back into the water.
    Absolutely!
    “Oh right, because you walked into strippers discount warehouse and said ‘Help me showcase my intellect.’” - Archer

    Bill
    Grand Rapids, Michigan
    1985 Donzi Criterion SS
    1967 Donzi 16 Ski Sporter, C16-409, Has a new home!
    38' Carver Aft Cabin
    1968 Sea Ray SRV 180 w/1975 70 hp Evinrude
    10" RIB w/15 hp 1984 Evinrude

  13. #13
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    Ralph, here's a link to a thread which covers installing a transom pickup:

    http://www.donzi.net/forums/showthre...Barrel-Back-18
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

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