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Thread: water rail help

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    blairwill4's Avatar
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    water rail help

    Okay so I need help understanding. Last summer a buddy of mine had a 2000 Slx that had tripple pissers on it. Since then I've seen a few others. If I remember correctly the water rail was removed and had three seperate hoses running out of the heads. I know the ultra 150 guys preach the tripple pissers. My question is, isnt the water rail an inlet for the cooling and not an outlet? And if so where does the water come out? I would like some form of a teltale just so I know that water is flowing. I know it has an overheat sensor but I like safer than sorry.


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    Click avatar for tech links/info, donation request K447's Avatar
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    Water manifold bar receives the hot water exiting from the top of the cylinder heads.

    Cooling water enters the engine via the exhaust water jackets.

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    blairwill4's Avatar
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    So what would happened if I removed the whole rail and got fittings to go in each of the holes?

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by blairwill4 View Post
    So what would happened if I removed the whole rail and got fittings to go in each of the holes?
    You would have three water exits. Balancing water flow and cylinder temperatures across all the cylinders would be done manually with flow restrictors or small valves.

    Without the thermostat and pressure bypass to restrict water flow at low RPM engine cooling response will behave differently.

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    blairwill4's Avatar
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    well if i just left it wide open all the time would It hurt the ski?

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    Quote Originally Posted by blairwill4 View Post
    well if i just left it wide open all the time would It hurt the ski?
    These engines with factory cooling configuration are quite capable of running flat out on the water without much worry. Many guys seem to ride only at idle, just above idle, and wide open throttle!

    We often run at wide open for many minutes at a time (Virage TXi and MSX 140).

    What is required is the maintenance and upkeep that ensures the oiling system and fuel system really are 100% good. Clean, tight with zero leaks. OEM fuel and oil filters, clean fuel tank, etc.

    BryanP did some temperature testing with stock thermostat and stock pressure bypass valve.

    At high engine RPM the water exit temperatures went down due to the increased water flow. Slow down to idle and the thermostat brings the engine back up to target water temperature (circa 140F).

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    blairwill4's Avatar
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    so being as cold as possible isnt necesarrily a good thing?

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    Quote Originally Posted by blairwill4 View Post
    so being as cold as possible isnt necesarrily a good thing?
    Correct.

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    Maintain the thermostat and popoff and leave it alone is usually advice. Polaris put it there for a reason. The cooler engine temps from removing the water rail may change your carb tuning as well. I have a temp gauge on one of my skis. At speed the engine runs at 100 degrees.

    I run in cold water a lot and the stock cooling setup helps keep some heat in the engine.

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    Some heat is needed in the engine especially at low RPM to avoid excessive carbon/crap building behind the rings.

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