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  1. #1
    ABBOTT's Avatar
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    MIGHT BE ASKING A DUMB QUESTION, BUT.......

    On the cooling water hose that is coming from the pump to the manifold intake and is joined by the red "y" connector that runs up to where a water hose would go-------------------does it matter which tip on the "y" side gets the main feed from the pump???? Because one side of the "y" has a directional arrow (just showing the water flow direction) but it happens to be a more direct shot of water to go towards the engine.

    Does it matter which side of it gets the flush hose connected to it. I am trying no to rob the engine of water pressure coming in and i cant remember which side got which hose.


  2. #2
    Moderator RX951's Avatar
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    the red arrow is to- > the motor

    pg. 160-161 of the 1300R service manual shows a diagram.

  3. #3

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    Take it a step futher John.

    The water supply to the engine goes through 3 restriction points before it actually gets to the engine:

    1. The through hull fitting from the pump

    2. The "Y" fitting that you are referring to.

    3. The plastic manifold inlet which is attached to the bottom of the exhaust pipe.

    If you have a set of drill bits, stick the largest bit you can that will actually fit into all three. Find out which of these 3 fittings/hose connection points is actually the smallest..... that is your water restriction. Increase the inside diameter of the fittings based upon the wall thickness by reaming the fittings out. Make sure that you use the same bit on all of the fittings to "match" the inside diameters of all the fittings. It's kinda like porting the water supply to maximize water flow.

    You will not be increasing pressure, just volume and therefore, cooling. It may not be a whole lot, but hey! Details is what's getting the crazy numbers that the GPR is putting out these days.

  4. #4
    It really makes no difference since the holes on the exhaust manifold gasket and head dictate how much water will pass thru!!!

  5. #5
    ABBOTT's Avatar
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    great info- thanks a bunch. I know its the little deatails like this that can make or break a boat - i just wanted to be careful.

    And thanks for the page # Billy - i will check it out.

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