Water Plumbing Question
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Water Plumbing Question

  1. #1
    Urban Cougar Trapper Gopher711's Avatar
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    Default Water Plumbing Question




    Running a competition intake are the ports in the front of the manifold supply or discharge ports ? I have water going into Both the block and the front intake ports as you can see in the pic ......then there are two ports at back of intake that I have discharging overboard .....
    my problem is looking at engine from front , right bank is getting hotter than the left 140 to 210 difference in temps ....should I just run water into block and plug these two ports at the front ? Or also run these overboard ?
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  3. #2
    Or Seth, either one Budweiser's Avatar
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    All 4 are discharge ports (search 4 corner cooling). With the engine tilted back and then the boat also sitting ass low, that particular plumbing solution is trapping air in the head and it wont fill entirely with water. Either dump all 4 corners or just the front two and plug the rear. two cents worth of my logic anyway.
    Last edited by Budweiser; 03-01-2016 at 11:41 PM.

  4. #3
    steelcomp was here
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    Front ports are discharge for normal series water circulation (and how the system was designed). You've created a parallel water circulation system which is not near as efficient and can cause problems. I imagine the front of the engine is ice cold and the rear is overheating. There's no balance or bottom-to-top circulation like you have it.
    Last edited by scott foxwell; 03-02-2016 at 06:01 AM.
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  6. #4
    Urban Cougar Trapper Gopher711's Avatar
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    Ok , so i guess i will just plug the back two ports and move discharge hoses to front ports and give it a try ?
    Thanks Guys !
    http://oathkeepers.org
    Due to the fact that GOD limited mans intelligence , it's unfortunate he did not also limit his Stupidity !!!

  7. #5
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    It sounds like you may have the information you need, but I have a competition manifold also.
    Since mine is a V-Drive, how the water is delivered will be different, but my water is plumbed going into the front of the block, and then exists out of the two intake manifold ports above where the water enters the block.
    Essentially, the same as an automobile not using reverse flow cooling. (as in older cars)

    You may already have this covered, but use fairly large discharge hoses to prevent water pressure build up in the block.
    Regulate the water flow going into the block, not after.
    Last edited by jimsplace; 03-02-2016 at 08:46 AM.

  8. #6
    Senior Member wizbang's Avatar
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    I bleed a #4 line out of the rear ports ?

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    Quote Originally Posted by wizbang View Post
    I bleed a #4 line out of the rear ports ?
    Are you saying you use (1) #4 line for your water discharge?

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    I link the rear ports with -8 line
    I then weld -10 bungs up front and bend a hard line to link the two fronts with a -10 fitting in the middle of the hard line for discharge ....

    Don't know if it's the best way but I've never had over heating problomes and heads are always same temp

  11. #9
    Senior Member wizbang's Avatar
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    Quote Originally Posted by jimsplace View Post
    Are you saying you use (1) #4 line for your water discharge?
    Sorry to confuse you.
    ( KRR )

    I feed the engine from the cav plate with one # 10 line to a "tee" in the left side board, one leg goes to a check valve w/ a 17# check then to the outboard side discharge.
    The other leg of the "tee" goes to the "Y" at the front corner of the engine, then splits into two each #8 lines that feed the water pump holes on the front of the engine block.

    Then I use one #4 each side in the rear, plumbed to the front end of the blower manifold "exit" lines of two each #8 lines that exit out the side of the boat.

    The cylinder head temps stay very close , front to back.

    The engine now runs at 195 degrees of water temp through the race, unless idling, then it drops cooler.
    The oil temp runs at 200 degrees.

    Before this system ,the dang oil and water ran at 100 degrees, never got any warmer.

    How we did the plumbing on the last couple engines, is a #4 hard line from the rear fittings, milled a slot through the webs under the blower,
    and machined a fitting into the from water port under the front of the blower. Gets the line hid and out of the way.

  12. #10
    Senior Member wizbang's Avatar
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    Default Steam lines

    #4 lines
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  13. #11
    Urban Cougar Trapper Gopher711's Avatar
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    That's Slick !
    http://oathkeepers.org
    Due to the fact that GOD limited mans intelligence , it's unfortunate he did not also limit his Stupidity !!!

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