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4,3 Volvo Penta Riser Extension = PURPOSE

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  • 4,3 Volvo Penta Riser Extension = PURPOSE

    I have twin 4.3 Volvo Penta engines on my Regal
    Needed too get too Kohler Gen ,
    Difficult too reach areas of gen set since its tucked under deck and riser of port engine stops my arm from reaching

    Removed riser & external oil filter , ,

    Have supply of green Volvo Penta gaskets ( from previous owner ) ,


    Riser & manifold was changed 10 months ago , ( new long blocks , shop used Sierra )

    Boat used in salt water , ,
    10 months , 75 hours since new long blocks , CRUD in water passage ? , Flush engines after each use ,

    Next agenda is too removed other risers & making sure they are clean


    QUESTION
    Purpose of 3 inch extensions or any extension under riser , NECESSARY ?
    Original design a table top is stored under deck ,. Since new manifolds / risers top hits risers and deck
    lid can not close flush


    thanks as usual




  • #2
    Originally posted by alan ber View Post
    QUESTION
    Purpose of 3 inch extensions or any extension under riser , NECESSARY ?
    Original design a table top is stored under deck ,. Since new manifolds / risers top hits risers and deck

    If risers were added, they are necessary. That means your boat is heavy, and sitting low, and the elbow to static water line measurement was less that 14"

    If you remove the risers, most likely you will end up hydro-locked because water will fill your engine thru the exhaust.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      Scott
      I was thinking prior too my post , Has too be a reason why a 3 inch extension is use
      On my Volvo , manifold , then 3 inch extension , then riser gets bolted too extension

      Was curious , looks like riser would connect directly too manifold , Purpose of Extension adds more height would stop
      back flow ? . higher over engine ,

      I had no plans on changing just curious why the use of an extension

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      • #4
        I had no plans on changing just curious why the use of an extension
        Ayuh,..... As Scott said, the bottom of the exhaust cavity, inside the riser, HAS to be 13.5" or higher, than the waterline, outside the hull,.....

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        • #5
          So along that line would it be beneficial to run taller ones when replacing if clearance isn't an issue. Would it hurt cooling or performance?

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          • #6
            Sign up today
            Ayuh,..... Either you have the height, or ya don't,.....

            Addin' extensions ya don't need just adds weight, 'n expense,....

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