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  1. #1

    42c w/6-71 naturals

    Anybody know cruise speed on a 70's 42c w/ 6-71 naturals? I was surprised to hear from a friend who's looking that there were any naturals. My dad had one years ago with Cummins VT903's, and I knew there were many with 6-71 turbos. My friend's no speed demon, but he'd like to know. Thanks
    -- Paul

  2. #2

    Re: 42c w/6-71 naturals

    I didn't know they built them with naturals, either. Sounds like a 15-16kt boat.

  3. #3

    Re: 42c w/6-71 naturals

    My 37C with 671N advertised is 18knt cruise max 21
    real world 14-16 Cruise 17-19 Top end
    42 should be about the same

  4. #4

    Re: 42c w/6-71 naturals

    Quote Originally Posted by newinlet View Post
    My 37C with 671N advertised is 18knt cruise max 21
    real world 14-16 Cruise 17-19 Top end
    42 should be about the same
    You really think it would be the same as a 37c? That 42 must weigh at least another 4-5k, no? My guy would probably be fine if the boat at least got up on plane and stayed there without having to be WOT. Thanks for the feedback.

    -- Paul
    -- Paul

  5. #5

    Re: 42c w/6-71 naturals

    Hello, my 42 with natural 903's runs 18 knots at 2150 rpm. I'm sure that it may be a little different with DD but it gives you and idea.

    Walt Hoover

  6. #6

    Re: 42c w/6-71 naturals

    Quote Originally Posted by Paul45c View Post
    You really think it would be the same as a 37c? That 42 must weigh at least another 4-5k, no? My guy would probably be fine if the boat at least got up on plane and stayed there without having to be WOT. Thanks for the feedback.

    -- Paul
    Running them WOT should not be a problem. you are pushing out much less HP than a turbo/ large injector motor.

    I think the issue is will it fall of plane in rough sea/heavy load. will the boat be a dog in with this HP?

    I think it will. the worst thing is falling off plane going in a head sea.

  7. #7

    Re: 42c w/6-71 naturals

    Quote Originally Posted by whoover View Post
    Hello, my 42 with natural 903's runs 18 knots at 2150 rpm. I'm sure that it may be a little different with DD but it gives you and idea.

    Walt Hoover
    That's very helpful, I think. They should indeed be comparable.

    -- Paul
    -- Paul

  8. #8

    Re: 42c w/6-71 naturals

    Quote Originally Posted by Paul45c View Post
    You really think it would be the same as a 37c? That 42 must weigh at least another 4-5k, no? My guy would probably be fine if the boat at least got up on plane and stayed there without having to be WOT. Thanks for the feedback.

    -- Paul
    I think its quite possible the 42 might run the same or maybe a little better with a little extra length
    the 37 is 29-30K Lbs Not sure but possible

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