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Old 02 January 2014, 05:24   #11
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 886
Here one web site that covers the consumtion of various mercruiser models, indicative but gives some ballpark figure.
MerCruiser 3.0 Fuel Consumption 135 HP | MPG GPH US Gallons per Hour | 3.0 L 181 mpi/tks.

It would be fun to put a 3.0 L on a SR, the stability would be very good but the weight is maybe litle on the high side?

IMHO the yam 90 is a suprisingly fuel efficient OB for a 2 stroke, and at WOT(33 L/H +- ) there is not much difference even to modern engines.

We use a fuel flow meter on the SR 5.4, and contradictonary what other reports, the speed seams not to affect the economy very much. Sweet spot is 28 knots +-(wheater permitting) and then we do aprox 0,8 l/nm(long distance average, moderate sea satate, fuel and a few kids as cargo). r

At WOT it does aprox 0,85 L/NM and about the same at 22 knots. If less than 22 knots the consumption /nm increases. For sure at cruising speed a 4s or DI 2s would use less.

fun on a boat is inversely proportional to size...sort of anyway
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