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  1. #1

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    Jetworks Failure, How?

    Hello,

    My buddies jetworks valve backed out and his boat promptly filled up with water and melted his pvc exhaust. He was lucky and made it to shore before any real damage was done. What could have caused this? My jetworks has been working fine for 3 years without issue. There was a spring, ball & thick washer at the bottom of the hull. Does anybody have a schematic or diagram of the valve so I can put the valve back together correctly? My ski is 120 miles away so I cannot reference it. On another note, does anybody know what has a higher melting point, pvc or abs?

    Thank You.


  2. #2
    My son (mohawk man) jeffsntx's Avatar
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    If the washer that you are refering to fits the OD of the valve, that is the standard valve. This valve uses washers to set the opening point. It must not have been tightened down and came apart on him.

    MOST people are using the Pro valve. It doesnt use the washers, you just turn it clockwise/counter clockwise to adjust the opening pressure. There is an O-ring that puts enough tension on the valve body to keep it from backing off.

    When you put the valve back together, the ball goes towards the inlet, and then the spring goes on top of it. Put the washer on the outside of the valve and screw it back together.

  3. #3
    Moderator OsideBill's Avatar
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    Quote Originally Posted by thebert View Post
    On another note, does anybody know what has a higher melting point, pvc or abs?
    Aluminum, Silicone hose. Get one of the Riva or R&D units I use the Riva blue silicone formed hose myself. The dollars saved on the plastic pipe is not worth your ski sinking next time something like this happens.

    Spud had his Jetworks clog with sand and the ski started running bad he pulled the seat and everything was smoking hot on the exhaust. Nothing melted though, He used the aluminum tube in his.

    Better safe than sorry I say

  4. #4

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    sorry but I forgot to mention that it is the jetworks pro valve and it was tightened just about all the way. That valve is a bear to loosen/tighten and that's what has me scratching my head... I will mention the riva free flow tube to him.

  5. #5
    Caution raider fan in the area !!
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    do they make a filter for the jet works mod to keep out the sand and dirt ?

  6. #6
    Moderator OsideBill's Avatar
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    Quote Originally Posted by thebert View Post
    sorry but I forgot to mention that it is the jetworks pro valve and it was tightened just about all the way. That valve is a bear to loosen/tighten and that's what has me scratching my head... I will mention the riva free flow tube to him.
    The pro valve has the oring on the outside of the body and this makes it difficult to tighten. I use silicone grease on the oring this helps.

  7. #7

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    thanks for the tip.

  8. #8
    Duke's Avatar
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    Quote Originally Posted by rddrkv View Post
    do they make a filter for the jet works mod to keep out the sand and dirt ?
    The filter will clog before the valve will. Either way the exhaust will over heat.

  9. #9
    ph2ocraft's Avatar
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    Maybe give Art a call and see what he thinks.
    http://www.jetworks.net/

  10. #10

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    fyi:

    pvc - melting point = 176 degrees, max. temp = 158 degrees.
    abs - melting point = 221 degrees, max. temp = 194 degrees.

    i found this info via google search.

    this is good knowledge when constructing a free flow.

    now, has anybody plumbed up their exhaust temperature probe with a exhaust gas temperature guage? I don't think the guage would do the abs/pvc any good unless the probe was mounted in the freeflow. Perhaps an EGT guage with an alarm would be an even better idea...I think this will be my winter project Who sells a good EGT without breaking the bank?

    Thanks.

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