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Old 27 June 2006, 18:54   #11
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Its quite scary isn't it.
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Old 28 June 2006, 02:15   #12
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outboards drink about 1.2 gals an hour at WOT for every 10hp.
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Old 28 June 2006, 02:57   #13
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Quote:
Originally Posted by fast fred
outboards drink about 1.2 gals an hour at WOT for every 10hp.
Please don't say things like that, it scares the hell out of me, enough to go and sell my RIB now. According to the above, my Yam 60 2s will drop 45 ltrs of fuel in so short a time that I can't even have the bottle to quote it.

Is this accurate?

I now 2strokes are famous for being heavy on fuel but not at the rate of an alcoholic rugby team.
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Old 28 June 2006, 04:26   #14
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Quote:
Originally Posted by Narcosis
Is this accurate?
No, thankfully. Fred is in the US so different sized gallons. You would be better working on 1 gallon an hour for every 10 hp, (so 27 LPH) but this is at flak speed so during a normal day you will use less.

Pete
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Old 28 June 2006, 04:33   #15
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i think freds post is very accurate if petes is as his reference is us gallons which seem to be around 80% of a uk gallon

1 uk gallon = 1.2009503853213334 US gallons

1 uk gallon = 4.546092 litres

1 us gallon = 3.785412 litres

i think my opti is rated at using 18 or so us gallons per hour at full chat, but usually you dont drive everywhere at full chat, drop back to 75% or so and you can halve your compsumption or drastically reduce it anyway

reading figures for fuel used at wot is always very scarey, dont get too alarmed by it

smartcraft seem to read in us gallons so giving the impression they are thirstier than they really are

my 200 opti seems to average around 4.3 miles to a us gallon if that helps

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Old 28 June 2006, 04:37   #16
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Country: Ireland
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Quote:
Originally Posted by Narcosis
Is this accurate?
Not for my outboard it's not!

Full speed on my 60hp Yamaha is 30mph. It drinks roughly 1 litre every 2 miles. Therefore, it uses 15 litres total per hour or 2.5 litres for every 10hp.

I don't know if Fast Fred is using US gallons or standard gallons, but either way I don't agree with him:

Converting from litres, my outboard uses 0.66 US gallons or 0.55 standard gallons per hour per 10hp.

Either way, roughly half of the 1.2 gallons quoted by Fast Fred.
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Old 28 June 2006, 06:28   #17
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Quote:
Originally Posted by jgrace
Full speed on my 60hp Yamaha is 30mph. It drinks roughly 1 litre every 2 miles.
Yours is a 4 stroke isn't it ?

Pete
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Old 28 June 2006, 07:34   #18
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thats for Flat out, bolted to the floor, for one hour. some will do better
others not.
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Old 28 June 2006, 10:50   #19
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Quote:
Originally Posted by Pete7
Yours is a 4 stroke isn't it ?

Pete
Yes it is. Sorry, was this all about 2-strokes? Fast Fred just said "outboards"

Jim
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Old 28 June 2006, 11:12   #20
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Quote:
Originally Posted by fast fred
thats for Flat out, bolted to the floor, for one hour. some will do better
others not.
The figures I've been quoting are average consumption. I've never tested my consumption flat out, but I reckon it's probably better than average, because the boat is planing the whole time. Fuel consumption per distance is much heavier in displacement mode, and as most of us spend a significant amount of time getting in and out of harbours etc. at slow speed, it follows that this will make the overall consumption worse.

Jim
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