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    #31
    I removed my 3870 water tanks and built 2 fiberglass 38 gallon tanks, slid one over then dropped the other in, made the connections in the forward area.
    2" shorter would have helped with room for the connections.
    Pat says: DO-IT-RIGHT THE FIRST TIME!

    Bayliner 3870 "ALASKA33)
    Twin 350 GM power
    Located in Seward, AK
    Retired marine surveyor

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      #32
      OK, for any of you guys interested in tunnel extensions we got the boat out today for the first time since the installation. Definite improvement. Before 2000 rpm gave 8 - 9 kn, now gives 10 - 11. To cruise at 8 - 8.5 kn now takes 1750 instead of 2100, Top end today was 20 kn @ 3300 rpm. Highest I remember previously was 18 kn. There is definitely less rooster tail effect and the trim tabs worked better. And a bonus below : )
      Click image for larger version

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      P/C Bob Hicks JN
      Dock Holiday, 1992 Bayliner 3888 Double Cabin Flybridge Cruiser
      Twin Hino W04TI 210 HP Diesels with Hurth HSW630A 2.0:1 Trannys
      Westerbeke 8.0 BTD-614 8KW Genset
      Avon 9 ft 6 in Tender with a Tohatsu M8B 8HP outboard
      Currently moored at Stones in Nanamio, B.C.

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