[Question] Water Pressure - Help
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Water Pressure - Help

  1. #1
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    Question Water Pressure - Help

    So I took my new beast out for my maiden voyage today and promptly overheated... I think. Have a look here:




    Notice the two vinyl/reinforced tubes coming up either side. That's my "water in" from the pump. There is a valve in the back at the pump, which I opened. When I was sitting and idling, I could watch water "bouncing" up and down in those intake lines, but never quite making it all the way up to the inlet. When I popped the throttle I could see the water column rise up, so I decided to try a test run. When I got on the throttle (Oh, my - it was orgasmic) the water sure seemed to start flowing... I could see heavy vapor coming out of the Headers and my water pressure gauge started registering and the engine temp was around 215-220. However, when I got back off the throttle, I don't think the water was flowing and the engine temp quickly climed back up towards 240. Is there some "balancing act" I have to perform with my water?
    Any help appreciated.

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  3. #2
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Marc Vernick View Post
    So I took my new beast out for my maiden voyage today and promptly overheated... I think. Have a look here:




    Notice the two vinyl/reinforced tubes coming up either side. That's my "water in" from the pump. There is a valve in the back at the pump, which I opened. When I was sitting and idling, I could watch water "bouncing" up and down in those intake lines, but never quite making it all the way up to the inlet. When I popped the throttle I could see the water column rise up, so I decided to try a test run. When I got on the throttle (Oh, my - it was orgasmic) the water sure seemed to start flowing... I could see heavy vapor coming out of the Headers and my water pressure gauge started registering and the engine temp was around 215-220. However, when I got back off the throttle, I don't think the water was flowing and the engine temp quickly climed back up towards 240. Is there some "balancing act" I have to perform with my water?
    Any help appreciated.

    Pictures worth a thousand words, first concern here are "Vinyl reinforced hose" and would assume this hose is clear as you can see thru it ? more info will be helpfull

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    The two white-ish hoses with diamond-shaped nylon braiding in this picture are my inlets. Yes they are clear and I can see the water.

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    Just realized my picture didn't upload...
    Sorry
    Click image for larger version. 

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  7. #5
    Senior Member ol guy's Avatar
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    your'e plumbing is backwards. Inlet goes into the block and exits thru the manifold. Especially with a thermostat.

  8. #6
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Marc Vernick View Post
    The two white-ish hoses with diamond-shaped nylon braiding in this picture are my inlets. Yes they are clear and I can see the water.
    If indeed those two "clear hoses" represent "water In" like Marc said thats entirely wrong , additionally would never suggest that particular type hose for any application beyond a bilge pump , water should exit the jet T off and enter the engine at the sides of the timing cover the water exits the engine via the intake manifold at the thermostat housing , in your scenario theres a bypass system due to the use of that "thermostat device" which also looks to be plumbed incorrectly

    Jet Boat Performance, Jet Boat FAQs diagrams, Impeller charts,

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  9. #7
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    First and foremost - THANK YOU! This is the kinda forum chat I was hoping and praying to find.
    JetPerformance, I think I have exactly what your diagram shows... except I have one outlet to a tee that feeds both headers and the other outlet goes out the transom and dumps water (the "overboard" in your diagram). My inlet hose comes from the Berkely pump with a braided S/S hose to a tee, then splits and comes up with to two tees on the front of my motor (timing cover?) and from those tees changes to the poly hose and goes to the upper two inlets on my "thermostat". By the way, took the boat out again and the system seems to be working well... constant water vapor dumping out the headers and I read about Rewarder Headers backflow or reverb system. So I think I'm ok exhaust-wise, but I wanna make sure the motor's getting cooling. I have a water pressure gauge and it seem to be always on the very low side of the spectrum.
    Here's a pic of my set-up again with arrows I drew on it to show flow. (Blue in, Red overboard, Yellow headers).
    Click image for larger version. 

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    Last edited by Marc Vernick; 06-26-2016 at 06:06 PM.

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