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Water bypass/pressure
Ok so I have carb motors but I’m running the 2 hose EFI style thermostat housing and a recirc pump. I have high pressure that’s rpm based. I can rev up in neutral and get the pressure to jump to 30+. I decided to try a bypass from plug in from of intake to a T on riser hose. (Gil exhaust). This worked. I’m going to do all 4 to get pressure back to normal. Now my biggest question is should I need check valves on these bypasses. I did a test run with the first bypass in and things are certainly improved. Didn’t notice anything negative but just curious if these bypasses should have check valves or will it not matter? |
Any pics of how you set it up??
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Haven’t taken any yet. But on fitting from intake right next to thermostat housing. Hose to T on Gil riser hose. Pretty simple setup.
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https://cimg2.ibsrv.net/gimg/www.off...66dbbadc0.jpeg The white line is where the bypass hose runs. T on the Gil riser hose. Barb fitting replacing plug in intake |
What size hose did you run? Did you reduce the hose size on the by-pass hoses? Have you tried it on the water yet?
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Drill out the thermostat / mercy pressure relief valve plumbed in . That’s a lot of pressure just Erving motor. , wow.
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1/2 inch hoses. I’m just curious if I’d need a check valve to keep manifold water from going into engine. But yes the first one is done and everything seemed ok on sea trial. |
Crude Intentions,
Thanks for the info. I run the same thermostat housings and drilled out my thermostats with three holes. I still had high water pressure at higher speeds. I then added water pressure relief valves. It helps, but over 4000 RPM it starts getting over 35 psi. I have been told it is fine, but I would like to get it down a liitle bit more. I'm going to try your set up. What pressure were you running when you tested the 1 motor? Thanks. |
Please post a picture of the finial set up, when you get a chance.
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It’ll be a while before I get it post a pic. The easy numbers to remember were non bypassed 30+ over 5k. Bypassed on one side was less then 20. This was tied to dock in neutral. So the second bypass should relieve enough pressure so it’s back to speed pressure and not rpm based. These are the Ts I’m gonna go with. I bought Ts and nipples but the kit is too big to look clean so gonna swap to these. Also just a nipple threaded in place of the plug with some 1/2 inch heater hose from auto parts store. Clean set up. 1 Inch x 1 Inch x 1/2 Inch PEX Tee, Brass Construction |
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