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Diesel fuel consumption

Discussion in 'Technical Discussion' started by JonMac, Feb 23, 2012.

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  1. JonMac, Feb 23, 2012
    #1
    JonMac

    JonMac New Member

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    BVI
    I'm looking to buy my first cruiser / sport fishing boat for use in the Caribbean, something like a Chris Craft 31 Tournament Sedan. I would be using it purely for day fishing or short island hops, mainly crusing around 6-7 knots. Most boats of this type are fitted with gas engines but I would like to know how the fuel consumption of a gas engine compares to that of a diesel. The upgrade might be worth the money. I appreciate that there are so many variables, engine types etc but can anyone give me a rough idea of comparable fuel consumption figues at the speeds I intend to travel at (per engine)? Any advice grearly appreciated.
  2. Pascal, Feb 23, 2012
    #2
    Pascal

    Pascal Senior Member

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    I d b surprised if at 6 to 7 kts you will save more than 1GPH by switching to diesel.. So assuming the repowee will cost you $25 to $30k, it will take about 7000usg to make it up.. Or about 7000 hours...

    Not worth it.
  3. NYCAP123, Feb 23, 2012
    #3
    NYCAP123

    NYCAP123 Senior Member

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    Doesn't seem like the right boat for those speeds except while fishing. Also, that repower would likely cost more than the boat is worth. You'd never get it back or make it up. Plus Pascal's price is per side. However, if that's what you want there is a 1975 30' for sale on YW with twin yanmar diesels for 39K.
  4. Capt Bill11, Feb 23, 2012
    #4
    Capt Bill11

    Capt Bill11 Senior Member

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  5. weto, Feb 23, 2012
    #5
    weto

    weto Senior Member

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    Did I read R-12 on one of the a/c assem's ? If that's the refrigerant Isn't that stuff VERY pricey (if you can find it), like a 100.00 per 16oz ? :confused:
  6. Capt J, Feb 24, 2012
    #6
    Capt J

    Capt J Senior Member

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    They have drop-in replacements for R-12 now according to my a/c tech. R-12 is very pricey, but not quite $100 per lb as far as I know.
  7. weto, Feb 24, 2012
    #7
    weto

    weto Senior Member

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    Before I sold a commercial building my family owned (auto repair shop in Nor Cal in 2007) I sold everything in it and there was a ton of the little 16oz cans of R12. I sold all of them to a fella at 60.00 per and he said he could get upwards of 80.00 per. I know in the auto repair side you can retro-fit to the newer R-134a type. Can that also be done on these marine units as well ? Is R-12 even mfg'd anymore ? I thought they quit making it in 04 or earlier.