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  1. #1
    Join Date
    Jun 2017
    Posts
    220

    Default Is bigger always better?

    On a light 17ft open boat (dory type) with a Max rating of 115hp is this really the best bet?

    Would 90hp be sufficient (pooling around, waterskiing, donuts, fishing), lighter so easier to put on a trailer, more fuel efficient, cheaper insurance.

    I have a 16yr old son who tells me I need to put the max power on or Iíll regret it later (he would wouldnít he?)

    Which one of us is right? There isnít a great deal of cost difference between the two about 10% or £800.

  2. #2
    Join Date
    Dec 2005
    Location
    Live London
    Posts
    3,837

    Default Re: Is bigger always better?

    For £800 I would buy the bigger one.

    More power to get on the plane, deal with fouling etc.

  3. #3
    Join Date
    Sep 2002
    Location
    South
    Posts
    16,743

    Default Re: Is bigger always better?

    Mercury / Mariner 90hp and 115hp are the same blocks in different states of tune.
    So, no weight difference.
    The extra £800 will give you a few extra knots flat out - only you can decide if it’s worth it.
    Fuel consumption at the same speed will be about the same - 115hp just gives you the option to burn more if you want to.

  4. #4
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,185

    Default Re: Is bigger always better?

    Quote Originally Posted by Homer J View Post
    I have a 16yr old son who tells me I need to put the max power on or I’ll regret it later (he would wouldn’t he?)
    And so he should, bright lad that one. Must get it from his mum

  5. #5
    Join Date
    Sep 2016
    Location
    SoF
    Posts
    9,839

    Default Re: Is bigger always better?

    We can all tell you how much you will miss the 25hp. But only you can tell us how much you will miss the £800

  6. #6
    Join Date
    Jan 2006
    Posts
    16

    Default Re: Is bigger always better?

    Always get the biggest one you can afford there is no going back. For £800 its there if you need it. To upgrade later will be really expensive - new engine

  7. #7
    Join Date
    Mar 2016
    Posts
    1,021

    Default Re: Is bigger always better?

    Perhaps not an issue here...but if this might be an older boat you have that has a rated HP of 115...it will be for a 2 stroke.
    If the new considered engine is a 4 stroke and older than 2015/16 then it will be likely another 1/3rd the weight of the original engine they referred to when rated new.
    Just a thought. If itís not applicable. Fair play.
    Otherwise then go for the biggest you can. Bigger doesnít always mean more fuel.
    To answer your other question...a 90 will be just fine for the odd hoon about and water ski. More than fine.