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Trolling Valves?

Discussion in 'Technical Discussion' started by Mark I, Jul 4, 2010.

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  1. Mark I, Jul 4, 2010
    #1
    Mark I

    Mark I Member

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    What are they and how do they work? Can older boats/engines be retro-fitted to troll slower?

    I know that they allow torky diesel boats to troll at slower speeds but that it the extent of my knowledge.
  2. K1W1, Jul 4, 2010
    #2
    K1W1

    K1W1 Senior Member

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    Hi,

    They are valves that allow a lot of the clutch oil pressure to bleed off and let the clutches slip a bit, you can not run them at anywhere near full power.

    Not all G/Boxes can run them, check with the manufacturer of your to find out if they are available for your application.
  3. Mark I, Jul 4, 2010
    #3
    Mark I

    Mark I Member

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    Thanks
  4. NYCAP123, Jul 4, 2010
    #4
    NYCAP123

    NYCAP123 Senior Member

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    With the 51 Bertram I used to run we'd have to go to one engine and bring the wheel over going through harbors. Can definitely be a P.I.T.A. in a busy spot :(
  5. Capt J, Jul 5, 2010
    #5
    Capt J

    Capt J Senior Member

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    I get used to it and a lot of the sportfishes and fast MY's are that way. Usually you just countersteer one complete turn and you're right on the money.

    Trolling valves slip the gears a little as Kiwi said and some transmissions can be added, and yes it will slow the boat down, but what is your goal? Most sportfishes I never use the trolling gears while trolling and just keep 1 engine in gear to slow it down. I prefer the manueverability WITHOUT the trolling valves if we get on a large fish. The trolling valves will also create a lot more delay going into gear, and really shouldn't be shifted with them on.
  6. Mark I, Jul 5, 2010
    #6
    Mark I

    Mark I Member

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    On one engine I am still doing 4.5 knots. In order to get down to 3.5 I need to bump in and out of gear.
  7. NYCAP123, Jul 5, 2010
    #7
    NYCAP123

    NYCAP123 Senior Member

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    That's how it's done and it will drive you mad if you bring that boat south and get stuck on the inside below Beaufort, N.C.
  8. CSkipR, Jul 11, 2010
    #8
    CSkipR

    CSkipR Member

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    I have trolling valves and use them regularly in shallow water because the slipping clutch allows the props to slip in case I bump bottom. They are not good for manuvering the boat. My idle is 7.0 knts with both engines and 5.5 with one. Not sure about the retro fitting question.