New to Jets. What is pop-off valve for?
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New to Jets. What is pop-off valve for?

  1. #1
    Senior Member jrider44's Avatar
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    Default New to Jets. What is pop-off valve for?

    Can somebody explain what the valve on top off some jet pumps is for. I am new to jet boats. I bought a 1978 26' Hawaiian Party Cruiser with a bbc that was not properly winterized(in MN) and cracked the block. It has Berkley 12 JC pump. Want to learn what I can about it. Thank you
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    AKA OhOneWS6 Last Mohican's Avatar
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    That is a big ass jet. Cool boat. Post some more pictures of it. Long story short a pop off is a valve that lets the pressure by pass the pump prior to the bowl. In a fast boat when you lift off the gas at high speed the pump will continue to load causing the ass end of the boat to lift and the bow to dive. This can cause the driver to lose control. A pop off gives this pressure somewhere to go. I am sure someone will chime in with a better explanation.

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    Default Popoff valve

    Said well I found that a Popoff was needed on my 19 Daytona when I started exceeding the 110 mph mark. Agressive shoe cuts and depths caused the nose to dive during deceleration and loss of control as said. I would never go back without one unless staying under the 100 mph mark. Captain P

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    Senior Member jrider44's Avatar
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    Default Thanks guys. Here are a few more pics.

    Quote Originally Posted by Last Mohican View Post
    That is a big ass jet. Cool boat. Post some more pictures of it. Long story short a pop off is a valve that lets the pressure by pass the pump prior to the bowl. In a fast boat when you lift off the gas at high speed the pump will continue to load causing the ass end of the boat to lift and the bow to dive. This can cause the driver to lose control. A pop off gives this pressure somewhere to go. I am sure someone will chime in with a better explanation.
    Thanks for the responses. Where is valve mounted? In place of the hand hole cover? Here are a few more pics.
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    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    Senior Member jms-1's Avatar
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    Default

    here is a pic from the boards (not my boat) . it is the cylinder on top of the pump where the clean out would be.
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    Senior Member jetboatperformance's Avatar
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    VERY Cool boat , not likley it will be a canidate for a jet pop off, however good explantions here for you !
    also more info here ... http://www.performanceboats.com/jet-...off-valve.html

  9. #7
    AKA OhOneWS6 Last Mohican's Avatar
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    Grat boat. I dig the seats in the cabin.

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    Senior Member jrider44's Avatar
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    Quote Originally Posted by Last Mohican View Post
    Grat boat. I dig the seats in the cabin.
    Was repainted in 90s but I think interior is original 1978. Gotta love the plaid!
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

  11. #9
    AKA OhOneWS6 Last Mohican's Avatar
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    My Ambassador is a 76 with the original interior in the cabin. Love the groovy vintage stuff.

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    Senior Member old rigger's Avatar
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    That's the 25'. We also had a 28' which was exactly the same but had a built in swim step. It was called the 7 Meter.. This was back when the U.S. was going to switch over to the metric system. We built one a day of either the 25 or 28 every day along with all the other models we had, up to 9 a day at the peak. Both of the big boats were originals, tooled up in house. My friend still has the 25 molds. Lots of them rigged with Panther pumps too and some had dual Berks and dual BBC's.....and big ass gas tanks
    Last edited by old rigger; 02-27-2013 at 07:27 PM.

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    Senior Member jrider44's Avatar
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    Quote Originally Posted by old rigger View Post
    That's the 25'. We also had a 28' which was exactly the same but had a built in swim step. It was called the 7 Meter.. This was back when the U.S. was going to switch over to the metric system. We built one a day of either the 25 or 28 every day along with all the other models we had, up to 9 a day at the peak. Both of the big boats were originals, tooled up in house. My friend still has the 25 molds. Lots of them rigged with Panther pumps too and some had dual Berks and dual BBC's.....and big ass gas tanks
    Speaking of gas tanks, it is missing one tank. Know where I could find another? I have an original brochure with it listed as an 8 meter, Queen of the Hawaiian fleet. Brochure has all the different Hawaiian models in it, way cool!
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    Senior Member old rigger's Avatar
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    8 meter, I lost a meter somewhere over the last 35 years.

    it's easy to have a tank made, chances of finding one might be slim.

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    Senior Member old rigger's Avatar
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    Would love to see your brochure. Someone was kind enough to post this one years ago. I didn't keep any of that old stuff.

    Pre 25' flyer


  16. #14
    Senior Member jrider44's Avatar
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    Quote Originally Posted by old rigger View Post
    Would love to see your brochure. Someone was kind enough to post this one years ago. I didn't keep any of that old stuff.

    Pre 25' flyer

    I will try to get some pics of brochure up in a couple days.
    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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