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Old 03-15-2018, 08:35 PM   #1
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Twin Ford Lehman 120hp diesels on Albin 36

Can anyone give me a reliable figure of gallons per hour fuel usage at cruising speed (7 knots) for this configuration? I would be much obliged.
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Old 03-15-2018, 10:15 PM   #2
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Depends on many factors G/box ratio etc . If you PM me your email I'll send you the official fuel charts. Do you need the manuals etc? Have lots of info. Had lehmans in my trawler I lost in Irma.
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Old 03-15-2018, 10:37 PM   #3
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Never checked consumption on my twin Lehmans, but I hear around 14L/PH combined. Never tested mine, but they are miserly on fuel.
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Old 03-15-2018, 10:55 PM   #4
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So that would be about 3.7 gph. Thanks!
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Old 03-16-2018, 12:34 AM   #5
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As an indication on the last few 3 month cruises we have averaged .76 and .81 Gall per NM. Running normally at 1750-1800rpm.
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Old 03-16-2018, 02:35 AM   #6
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We had a Defever 43 with twin Lehman 120's usually allowed 4 US gallons per hour (15lph) at 7.5 knots when trip planning.
When I did a more accurate check it was 13.5 litre per hour.
Great engines, just change to the later type seawater pump if you can.
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Old 03-16-2018, 02:42 AM   #7
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We get 4gpg at 1800rpm on ours.
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Old 03-16-2018, 09:35 AM   #8
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As an aside, the cost of fuel is frequently mentioned as a concern but unless you are questioning the capacity or range, the cost of fuel is way down the list of things that will get you on a boat... Just sayin'
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Old 03-16-2018, 10:12 AM   #9
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For a 36' at 7kts, twin 120's, I'd guess total of 3gph. Might be 4 if heavy and a big keel.
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Old 03-20-2018, 01:35 PM   #10
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If this helps....I cruise at just under 2 gph on a Grand Banks 42 with a single lehman.
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Old 03-20-2018, 04:33 PM   #11
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Over 12 years and thousands of hours, we have averaged 2.7gph total boat usage. This includes genset (7.5kw) and diesel heater in Alaska. We run about 1450 rpm which gives us around 7knots. Includes trolling time, strong currents running both with us and against us. Weeks of whale researching and rescue work, etc. So many variables for so many years.

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