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Which Yanmar motors for a Sportfisher 37 foot ?

Discussion in 'General Sportfish Discussion' started by HankB, Oct 8, 2024.

  1. HankB, Oct 8, 2024
    #1
    HankB

    HankB New Member

    Joined:
    May 21, 2024
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    Location:
    Centurion
    Good day
    I need advise on what motors for my new Sportfisher 37 foot, building to start soon. The displacement should be around 11 ooo kg. Max distance out to banks will be 50 NM, mainly day-trips. I would like to cruise (conditions permitting) @ 20 - 24 knots.
    I live in Mauritius and Yanmar's service and support are good. I got a list of possibles:
    4 LHA - STP - 240 HP
    4 LV 250 - 250 HP
    6 LPA - STP2 - 315 HP
    6 LY2M - WDT - 330 HP
    8 LV320 - 320 HP
    I think the 4 cyl motors might be to small.
    I would appreciate any pointers
    Thnx
  2. Capt Ralph, Oct 8, 2024
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    I suggest max displacement vs HP.

    But if this a new build, the builder may have some guidelines and recommendations also.
  3. Capt J, Oct 8, 2024
    #3
    Capt J

    Capt J Senior Member

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    Fort Lauderdale
    Without knowing anything about the hull, it's impossible to say
  4. ranger58sb, Oct 9, 2024
    #4
    ranger58sb

    ranger58sb Senior member

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    Not much info. Cat or mono? Single engine, or twin? Et cetera...

    Perhaps your local Yanmar people can advise?

    If the 8LV if a V-8 design and if you're assuming twin engine installation, I'd avoid that. At 37' LOA and assuming a monohull (as many soportfishers are), you likely won't have enough beam to give you much of a decent access through the engine room with V engines.

    -Chris
  5. Norseman, Oct 9, 2024
    #5
    Norseman

    Norseman Senior Member

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    I have 6 years experience with the Yanmar 6LP(A)-ST(E/P)
    Good engine, solid and proven design, BUT pain in the rear doing routine service and trying to locate and replace hidden anodes tucked far back behind and between tubing and heat exchangers.
    Same with the raw water pump, impossible to just replace the impeller, need to swap out the entire pump, IF you can reach it.

    IF your boat have lots of room to work on, under and around the engines, then go for the 6LP, but be prepared for expensive Yanmar parts:
    This engine was developed by Toyota for the Land Cruiser, then Yanmar got involved and adopted the design for a high speed marine engine, Max RPM 4: 000, Max Continues 3,600.
    A Yanmar belt tensioner was $180 a few years ago, same part with a Toyota part number $35.:D
  6. HankB, Oct 9, 2024
    #6
    HankB

    HankB New Member

    Joined:
    May 21, 2024
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    Location:
    Centurion
    thnx Chris

    I narrowed it down to the straight six cyl motors

    The hull start with a deep V and from midships taper to a modified V, hope that makes sense in my laymen terms.

    It will be a twin engine

    Appreciate
  7. Pascal, Oct 9, 2024
    #7
    Pascal

    Pascal Senior Member

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    Miami, FL
    Definitely stick to the straight 6 with a small boat. Bigger engines will have a much easier life. Price difference between engine options comes up to a fraction of the overall repower costs
  8. DOCKMASTER, Oct 9, 2024
    #8
    DOCKMASTER

    DOCKMASTER Senior Member

    Joined:
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    Who is building your "new" boat? Are they not in the loop here and making recommendations? If not, find a new builder. Otherwise, you should consult with a reputable Yanmar dealer. You mentioned service and support are good. Have you talked to them? They should have a form where you fill out all the particulars for your vessel. Then the dealer talks direct to Yanmar and they make a recommendation. There are many things to consider here. You haven't scratched the surface with info you have mentioned here thus far.