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Old 14 September 2011, 05:07   #11
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Well there is a simple calculation thats used to work out the approx fuel consumption.
For a conventional 2 stroke its a third of the HP at wide open throttle per hour.
For a Four stroke/DFI you take a third off that figure again.
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Old 14 September 2011, 11:13   #12
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12miles pushing a 400KG Drascombe roughly 5 litres on 1/4 throttle Honda 4 stroke
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Old 14 September 2011, 13:18   #13
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Quote:
Originally Posted by Turbodiesel View Post
Well there is a simple calculation thats used to work out the approx fuel consumption.
For a conventional 2 stroke its a third of the HP at wide open throttle per hour.
For a Four stroke/DFI you take a third off that figure again.
I wish it were.

That would make my 150 DI, 35 l/h at WOT

I have a fuel flow gauge which is pretty accurate (5% overestimation) and that reads 65l/h at WOT
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Old 14 September 2011, 16:28   #14
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33.4ltrs actually!!
Its a approximate calculation that Merc/Mariner use. Every boat is different depending on weight etc.
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Old 14 September 2011, 16:45   #15
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So I guess that the fact I burn 65l/h in real terms means this calculation isn't all that "rule of thumb" then?
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Old 15 September 2011, 20:39   #16
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Highest I have seen on my Etec at WOT or very nearly that is 56lph so the thumbs are quite variable in length
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Old 16 September 2011, 07:47   #17
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I like Turbodiesels thumbs Then it's back to reality
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Old 17 September 2011, 08:12   #18
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Well i guess Etec's break the rules for Economy then. I thought they were supposed to be good on fuel.
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Old 17 September 2011, 18:53   #19
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Good until you use full moo I guess

Mine does consistently 1.1 - 1.2 nm/ltr in the cruising range 25-30 knots, but I think that drops to 0.7 ish when you get close to WOT. To be honest on the odd occasions I get to that speed I'm usually too busy holding on to be peering at ickle writing on the iCommands
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