650sx Coffman Pipe Dual Cooling Help...
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  1. #1
    PWCToday Regular
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    650sx Coffman Pipe Dual Cooling Help...

    Recently purchased a 650sx with a coffmans pipe and dual cooling set up. The cooling lines are run in a strange manner in my mind and I want to make sure they are either ok or I need to re route them.

    Current set up is...

    port side bulkhead going directly to fitting on the back of the head pipe (kind of like a stock set up)
    starboard bulkhead going to 1 of 2 fittings on west coast exhaust manifold

    2nd fitting on exhaust manifold being routed to fitting on headpipe right above exhaust manifold

    1 cooling line exiting mariner head to pisser
    2 cooling line exiting mariner head to stinger/second pisser

    This routing seems odd to me as typically both the lines coming from the bulkhead would be going to the exhaust manifold and the fitting on the back of the headpipe would be going to the stinger/pisser... Should i reroute the lines or keep them how they are?

    pics for reference...
    2C86D3F3-8CE7-41C1-AF07-62874513375F.jpeg
    04AC184B-D2E8-44BB-9A73-31E7881248A5.jpeg
    Last edited by roush611; 10-02-2018 at 07:52 PM.

  2. #2
    PWCToday Newbie CALJET's Avatar
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    Re: 650sx Coffman Pipe Dual Cooling Help...


  3. #3
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    Re: 650sx Coffman Pipe Dual Cooling Help...

    That’s not dual cooling though...

  4. #4
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    Re: 650sx Coffman Pipe Dual Cooling Help...

    If it were me, I would isolate the circuits for water flow between the engine and exhaust.

    First line:
    Bulkhead fitting -> Exhaust manifold (if there are two fittings, put a Y in so it feeds both) -> Both cylinder head outlets to pisser(s)

    Second line:
    Bulkhead fitting -> Exhaust headpipe (This is probably not intended, but I would route it into the front of the headpipe in the vertical fitting where it should be hottest) -> Out of exhaust headpipe rear fitting to a Y -> One leg of the Y goes to pisser, other leg of Y goes to the fitting on the exhaust chamber stinger, right before the waterbox

  5. #5
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    Re: 650sx Coffman Pipe Dual Cooling Help...

    This is the diagram that I was going to follow. Anything wrong with that?

    AD1B1CC2-D18C-4DBD-B5A3-46EE35818509.jpeg

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