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fuel consumption

Discussion in 'Technical Discussion' started by andrewseymoure, Oct 18, 2013.

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  1. andrewseymoure, Oct 18, 2013
    #1
    andrewseymoure

    andrewseymoure New Member

    Joined:
    Oct 18, 2013
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    Location:
    boston,ma
    I am trying to buy a 1991 silverton 41 aft cabin with two 502 crusaider gas engines.Can anyone give me an idea on fuel consumption for this vessel? Also how well does this boat handle off shore?
    Any information would be appreciated.
    Andy Seymoure
  2. CSkipR, Oct 23, 2013
    #2
    CSkipR

    CSkipR Member

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    Location:
    New Smyrna Beach, Fl
    Cruise approx. 36gph.
  3. Capt Ralph, Oct 24, 2013
    #3
    Capt Ralph

    Capt Ralph Senior Member

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    Satsuma, FL
    Ouch
    You really want to go there or just stay at the dock and look good.
    Just on a plane, Figure what CSkipR mentioned plus a few more. Or around 2 gallons per mile. It gets more depressing the faster you go after that. You can cut that in half by running at a fast idle, or just before your bow raises (slow)..
    If any broker tells you how fast it goes and not burn, or mentions how fuel efficient it is, run, quickly the other way, run.

    Look at it this way, on a natural gas engine, 1/10 gallon per horsepower per hour. You need 400+ horsepower to maintain plane. thats around 2500-2800 rpm each, 200-225 hp each, 36 to 40+ gph total, 14 to 16 knots with some tabs. And better drugs needed after that.
    Turbo diesel can cut that in half if you can afford the upfront cost of a newer diesel.

    Happy motoring,
    rc
  4. RT46, Oct 24, 2013
    #4
    RT46

    RT46 Senior Member

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    Location:
    Long Island, NY
    in some under 40 boats the gas engines make more sense than diesel.

    It all comes down to how much you will use the boat.
    Range is also a factor.

    The initial cost of gas engines vs diesel in small boats (under 40) is a big difference and modern gas engines are becoming more fuel efficient.

    I have a friend who has a 38-39 foot express production boat with twin big block EFIs. He puts maybe 60 hrs a year on the boat and it cruises around 30kts. It would take him a long time to make up the initial cost difference in fuel consumption if he bought the same boat with diesel power.