Do these things work?
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Do these things work?

  1. #1
    Glendale Arizona Squirtcha?'s Avatar
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    Default Do these things work?

    This piece came with the new (used) gullwing I bought. Trying to figure out if I want to plumb it in or not. I know it's not as effective as the bypass setup, but wondering if they work at all.

    Never had to use any kind of pressure regulator or bypass before, so torn as to whether or not to cut this in.

    Minimum pressure appears to be 50 psi. hard to read due to lettering being worn.


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    Default Water pressure regulator or popoff valve

    Both devices are great to save the head gaskets from high water pressure. I use @ 7 pounds of water pressure in the motor.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    i put 1 on this yr.., rather know the milking is coming from condensation than a internal water leak.

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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by Whip View Post
    Both devices are great to save the head gaskets from high water pressure. I use @ 7 pounds of water pressure in the motor.
    Is it even going to do any good with a minimum setting of 50 psi then? I've never checked mine the way
    it is now, and have no idea what kind of water pressure it's putting to the block with nothing in place to
    regulate it and no gauge.

    The only thing I do know is I've been running this motor the same way for 6 years without a problem.
    Last edited by Squirtcha?; 04-17-2008 at 08:47 AM.

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    DJD
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    6TH STREET MAFIA PRES. DJD's Avatar
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    I run one from Rex that looks almost exactly like that one and so far so good And ive ran it for about 6 years.

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    Senior Member oldbuck40's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    i put 1 on this yr.., rather know the milking is coming from condensation than a internal water leak.
    lmao yea after that milk job you got you better run one!
    tho one above is the same one i run,,the little trick is take WD40 and spray inside (both holes) then screw it all the way out till it stops and it will be good for about 15 lbs. no different than the pressure on a radiator cap.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by oldbuck40 View Post
    lmao yea after that milk job you got you better run one!
    tho one above is the same one i run,,the little trick is take WD40 and spray inside (both holes) then screw it all the way out till it stops and it will be good for about 15 lbs. no different than the pressure on a radiator cap.
    let's not talk about that, its a sore subject

    fyi, this block in the pic had a previous lifter failure which dented the cam gallery(before i got the boat), excessive water pressure found the weakness and blew it out. i didn't notice the dent, neither did the machine shop.
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    Jackwagon Patrolman Rexone's Avatar
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    Quote Originally Posted by DJD View Post
    I run one from Rex that looks almost exactly like that one and so far so good And ive ran it for about 6 years.
    They are except we change the springs. They need to be set with a gauge and ignore the markings.

    To be clear, these are bypass valves to control engine pressure. They are not pressure regulators which can impede flow depending on design.

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    Senior Member PLACECRAFT20's Avatar
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    I ran one as a bypass for my lightning headers and it worked great. I just let enough water in to keep the headers cool.

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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by Rexone View Post
    They are except we change the springs. They need to be set with a gauge and ignore the markings.

    To be clear, these are bypass valves to control engine pressure. They are not pressure regulators which can impede flow depending on design.
    I must be missing something then. If it's a bypass, wouldn't it require one inlet and two outlets? Mine's got one inlet and one outlet. Where's the bypass going? Or do I have to T it somehow?

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    Senior Member Robert Jonsson's Avatar
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    you'e supposed to run a "t" off the inlet where it comes in to the jet. that goes in to the bottom fitting. the other end goes as an additional overboard dump. thats why some people prefer the watts regulator. so they dont have to drill an extra hole. if you got plenty of holes out the back then i wouldnt worry about it.

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    Here is a pic I found in the spam section. It's in the boat Socal is selling. I hope he doesn't mind.
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    Squircha, I would plumb it in on one of the outlets on your manifold crossover, by the thermostat and let it bypass any excess water pressure that your engine has,
    that way your engine has water at all times. Just my .02

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    Quote Originally Posted by Squirtcha? View Post
    I must be missing something then. If it's a bypass, wouldn't it require one inlet and two outlets? Mine's got one inlet and one outlet. Where's the bypass going? Or do I have to T it somehow?
    Dan,
    Try thinking of it as a pressure relief valve. (like on your hot water heater) It only dumps water if the pressure exceeds the setting. You would install it in a "T" in your water line, or somewhere in your manifold as someone suggested.

    Doug

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