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Old 27 June 2013, 04:55   #1
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Common SIB engine WOT consumption?

I cannot remember if I saw something on here once but does anyone have guideline fuel consumption figures for typical 3.5m SIBs' with common engines at WOT (say 16 to 20 kts) and 2/3 (12 - 14 kts) throttle or so in gallons per hour or whatever?

Tohatsu 9.8
Yam 15
Mariner 15 etc?
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Old 27 June 2013, 05:14   #2
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I seem to recall the Tohatsu being 4.5l/h at WOT
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Old 27 June 2013, 05:19   #3
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I seem to recall the Tohatsu being 4.5l/h at WOT
+ 1 - Think Willk published that
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Old 27 June 2013, 05:24   #4
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I think your right
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Old 27 June 2013, 11:24   #5
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For 2 strokes around 12% of it's rated HP per hour work at wot. A 15 HP will consume around 1.8 (3.80) gal/per hour and that's with lightly loaded boats.

For strokes probably 30-35% less...

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Old 27 June 2013, 11:31   #6
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For 2 strokes around 12% of it's rated HP per hour work at wot. A 15 HP will consume around 1.8 (3.80) gal/per hour and that's with lightly loaded boats.

For strokes probably 30-35% less...

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Hi Loco,

Sorry for the dumb question maths is never my strong point how did you get from 1.8 to 3.8 gph?
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Old 27 June 2013, 11:40   #7
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Cheers guys, is there a formula for 1/2 or 2/3 throttle etc...?

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Hi Loco,

Sorry for the dumb question maths is never my strong point how did you get from 1.8 to 3.8 gph?

I think one US gallon is smaller (by 0.8)?
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Old 27 June 2013, 11:44   #8
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Sorry forgot to state, the engine consumption charts are based on US (3.80) Gal, if not mistaken you guys use 4.0 lt/gal right. Those are Tohatsu/Merc numbers, Yam probably slight more consumption.

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Old 27 June 2013, 11:52   #9
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Sorry forgot to state, the engine consumption charts are based on US (3.80) Gal, if not mistaken you guys use 4.0 lt/gal right. Those are Tohatsu/Merc numbers, Yam probably slight more consumption.

Happy Boating
1 UK gallon = 4.55 EU litres

Or approx 6.20...
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Old 27 June 2013, 13:45   #10
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1 UK gallon = 4.55 EU litres

Or approx 6.20...
Is that a real bad fuel price, our local premium 95 octane E8 ethanol blended fuels are equivalent to US $ 5.60 per 3.8 Lt/Gal. Horrible numbers too, that's why not planning in a neart or distant future running engines passing 18 HP which are top for my boating applications.

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