volvo dou props b4 $400 firm

twaken

captain
Nov 11, 2008
492
71
San Juan Capistrano Ca.
Name
Ken
Boat Name
26 ft Pen Yann diesel flybridge
B4's are for more top end speed and less out of the hole speed depending on the weight of your boat and other things. My boat runs best with b3's or maybe a b2. You should probably be running b4 or b3. What 24 do you have and how much do you weigh . (Your boat ) it also affects fuel burn . I burn @ 7 gallons per hour at 3000 rpmwhich is 3 miles toa gallon or better
 
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whitecap72

Member
  • Mar 3, 2009
    659
    178
    rohnert park, ca, usa
    Name
    austin
    Boat Name
    24' skipjack
    1979 24' open cruiser. Volvo 5.7 gas, with a 280 dp outdrive. Not sure on weight. It does come out of the hole pretty good. I've had a top speed of 52 mph at 5200 rpm on glassy water.
     
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    Albiebac

    Member
    Jul 23, 2004
    309
    129
    Scripps Ranch
    Name
    Eric
    Boat Name
    25' Skipjack, Albiebac II
    For what it is worth, I had B3's on my 1979 Skipjack 24 FB with 5.7 VP and 280DP. Sweet spot was 22-24mph at 2.2mpg. I have B4's on my 1990 Skipjack 25 FB with 5.7 and 290DP, probably getting less than 2.0mpg. Got me thinking now, maybe I should drop down...hmmmm.
     
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    twaken

    captain
    Nov 11, 2008
    492
    71
    San Juan Capistrano Ca.
    Name
    Ken
    Boat Name
    26 ft Pen Yann diesel flybridge
    For what it is worth, I had B3's on my 1979 Skipjack 24 FB with 5.7 VP and 280DP. Sweet spot was 22-24mph at 2.2mpg. I have B4's on my 1990 Skipjack 25 FB with 5.7 and 290DP, probably getting less than 2.0mpg. Got me thinking now, maybe I should drop down...hmmmm.
    My results were from trying b4s and b3s that I had more out of the hole power with b3s especially with a full load , but higher top end with b4s
     
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    twaken

    captain
    Nov 11, 2008
    492
    71
    San Juan Capistrano Ca.
    Name
    Ken
    Boat Name
    26 ft Pen Yann diesel flybridge
    It's had head work done,I believe 525is rpm is redline. Sweet spot is 3000rmp cruising speed. I'd say 2 mpg. It's got a stock cast iron hi rise intake and holly marine carb.
    Wow maybe I need some head work too, I get max 4400 doing 30 knots or so. My sweet spot Is 3000 too , burning 7 gph and doing @ 17 knots
     
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    twaken

    captain
    Nov 11, 2008
    492
    71
    San Juan Capistrano Ca.
    Name
    Ken
    Boat Name
    26 ft Pen Yann diesel flybridge
    20151107_175751.jpg
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    karlow

    Twins 2017
    Apr 29, 2004
    2,269
    1,201
    66
    Duarte/Covina
    Name
    karl
    Boat Name
    20' skippy Topless /17' whaler Wet Ride (sold) /18' Outrage
    How do you identify the props? I don't know what I'm running.
     
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