I discussed this a little here on another thread but now I have two questions. I will be installing my pressure relief valve and dump tomorrow. I plan to dump out the rear starboard side next to the bilge pump dump. Is there any reason not to go through the side and above the water line? (transom is fully cored)
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05-23-2010 04:40 PM
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05-23-2010 06:36 PMGood is that you can see it. Bad is that if you get an air leak, it can burn up the pump. Safest place is underwater....
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05-23-2010 09:58 PM
Well sh*t, now I have to rethink this but there isn't much time. If this is THE Brownie I have to give a lot of weight to that answer..
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05-24-2010 02:57 AM
My father installed the pressure relief valves on the Phantom in the exact spot that you mention, next to the bilge pump exit on the side(s) of the boat. He did that so he could look backdown the side of the boat while it was running above 45 mph and see if it was actually dumping water, the Phantom had an excessive water pressure problem which he solved after blowing a hose apart while running 86+ mph. He went through two different types of pressure relief valves to solve this problem. Good luck.
In the picture below (starboard side) you can at the very back of the boat on the side on exit is for bilge water (white ring), and the other exit is for excessive water presssure (white ring) behind the PhantiomV emblem. On the Port side is the identical outlets. The boat has two bilge pumps, and two pressure relief valves (twin engine boat). (Brownie knows way more than me, but I am not sure what pump will burn up when talking about pressure relief valves) The relief valve(s) do not have pumps for the Phantom pictured associated with the pressure relief valves in the set-up pictured, it is just dumping excessive water pressure.Last edited by Smarty; 05-24-2010 at 03:04 AM.
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05-24-2010 09:10 AMReggie burned a pump (and engine) in KW a few years ago. Sitting still, or idling is the most dangerous for ventilating. Not having an aggressive enough pickup is the danger at high speed.
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05-24-2010 02:06 PM
That makes sense in regards to ventilation for the external water pickup race boats. The Phantom I was referring has Bravo outdrives with low-water pick-ups. The suggestions to solve the excessive water pressure problem (suggested by Mercury Racing) were the the relief valves, or to plug up (close) two of the four water inlets on each lower. The relief valve is a spring loaded unit that is supposed to open at 40+ psi, pretty simple in design; the valves are installed in the bottom of the boat (below the waterline), and dump excessive water (pressure) above the waterline.
I was wondering what the high speed catarmarans did regarding excessive water pressure when they are approaching 150+ mph, and how that all works/is plumbed?Last edited by Smarty; 05-24-2010 at 04:38 PM.