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To much water pressure 509 big block

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Old 03-23-2009, 09:52 PM
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Default To much water pressure 509 big block

installed new offshore water pickup. 35 + lbs of pressure
looking for pop off of some sort to place in the block or inline from seapump. Anyone know where to buy reasonably priced
All ready blown head and intake gakets do not want a repeat
thanks
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Old 03-23-2009, 10:10 PM
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Is it a transom mount pick-up? If it is, file it down in small increments until you get the water pressure you want.
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Old 03-23-2009, 10:20 PM
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I've had great results with the Merc water pressure relief valve.

Here's a thread on it.

http://www.offshoreonly.com/forums/g...ief-valve.html

Kurt

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Old 03-23-2009, 10:25 PM
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Quote:
Originally Posted by Biggus View Post
I've had great results withthe Merc water pressure relief valve.

Here's a thread on it.

http://www.offshoreonly.com/forums/g...ief-valve.html

Kurt
I have used these and they work well
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Old 03-23-2009, 10:41 PM
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I can't post pic's here. Check this thread. Page 2. I made a pop off valve. 17 lbs at 36 - 3800, 20 lbs ate wide open 5000rpm.

http://forums.boatfreaks.org/showthr...water+pressure

Too much money for the merc plastic junk. My .02
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Old 03-23-2009, 10:46 PM
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is there any way to install a ballvalve to lower water pressure. i know trimming the pickup works better can also let u pickup more speed. was just wondering if it works i put some on my innercoolers but havent tested them yet.
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Old 03-26-2009, 09:27 PM
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Default water to high

thanks for the replies Will continue to file down, as speed increases so does water pressure.if that does not do it wiill make pop ff
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Old 03-26-2009, 09:34 PM
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A ball valve doesn't control pressure, it limits volume.

I installed the Merc relief valves on both of my completely stock motors after seeing over 35psi at cruise speeds. After screwing around for the better part of the summer trying different dumps, valves, different t-stat housings, I bite the bullet and installed the Merc valves. Now all is perfect!
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Old 03-26-2009, 09:47 PM
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wHIPPLE WANTS 25 LBS OF PRESSURE TO INSURE PROPER COOLING.I AM ORDERING MERC POP OFF WILL FEEL BETTER WHEN AT WOT BEEN AN EXPENSIVE PROBLEM
THANKS FOR THE LINK TO MERC
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