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Old 28 July 2014, 05:26   #11
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I've never found 12 litres lasts all day (how is all day 2-3 hours?) but I keep reading that everyone else's does!?

My Tohatsu 9.8 was not as thirsty as my Mariner 15 but in general use (ie not constant WOT) I average around 2 to 2.3 NM per litre or 8 litres an hour or so which is more than the old 10% of hp in gallons per hour (ie 6.75 for a 15). I've found that guide a bit optimistic.
I guess that you pack more into a day than most Max!

My longest "day" in the SIB has been just under 30Nm - that's a fair old bit of bumping along. Quite a lot of the time, I pootle about quite sedately, exploring and sh1t.

My sensible top end is about 16kts (it will do 18+) but mostly I'm running around 13kts and thus saving quite a bit of gas - stretching the range of the tank. WOT on the toohotsue is 4.5l/hr - this is probably what foxed you with the 15hp comparison.

Say I did run at WOT, the tank is actually a 13L and will therefore give me 2.88 hours at 18kts = 52 Nm approx. Who's doing 50Nm in a SIB?
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Old 28 July 2014, 06:53   #12
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Last trip was 26 NM and used 12 litres, before that 38 NM and 16.5 litres. According to the formula at WOT it should use 6.75 litres an hour but doesn't work for me, to be safe I need to guage 8 litres an hour minimum regardless of speed.

In the 26nm trip we were out for most of the day but 'moving' for 3.5 hrs at average of 7.2 but this is probably slewed by the GPS registering when the boat was moored.

Cannot remember the old Tohatsu figures but I think the 4.5 litres an hour was close.

Anyway, in a 'day', say actual
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Old 28 July 2014, 16:43   #13
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Hi Nick,the lawnmower is a 4 stroke,but i was thinking at the end of the season any left over 2 stroke fuel could go into the chainsaw or hedgetrimmer to get rid of it,but as you say garden machinery runs hotter than outboards so thats out,so could i use it the following year?How long does 2 stroke fuel last?
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Old 28 July 2014, 16:49   #14
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Phil,thanks for the tip of covering the engine connector with polythene and elastic bands it all helps.
chris
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Old 28 July 2014, 16:59   #15
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Hi Nick,the lawnmower is a 4 stroke,but i was thinking at the end of the season any left over 2 stroke fuel could go into the chainsaw or hedgetrimmer to get rid of it,but as you say garden machinery runs hotter than outboards so thats out,so could i use it the following year?How long does 2 stroke fuel last?
I chuck some into my diesel vehicle - maybe 2 liters in 80? The rest I add to 50% fresh in the spring and it seems to work just fine.

Top tip - don't mix that last 5L tank in the autumn - take the 5L tank of straight gas and a 100ml shot of marine two stroke and mix it IF you need it - not before...
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Old 28 July 2014, 19:34   #16
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I guess that you pack more into a day than most Max!

My longest "day" in the SIB has been just under 30Nm - that's a fair old bit of bumping along. Quite a lot of the time, I pootle about quite sedately, exploring and sh1t.

My sensible top end is about 16kts (it will do 18+) but mostly I'm running around 13kts and thus saving quite a bit of gas - stretching the range of the tank. WOT on the toohotsue is 4.5l/hr - this is probably what foxed you with the 15hp comparison.

Say I did run at WOT, the tank is actually a 13L and will therefore give me 2.88 hours at 18kts = 52 Nm approx. Who's doing 50Nm in a SIB?
Last day out in the sib 65 miles
Friday Sibbing 65 miles!
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Old 28 July 2014, 19:36   #17
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Hi Nick,the lawnmower is a 4 stroke,but i was thinking at the end of the season any left over 2 stroke fuel could go into the chainsaw or hedgetrimmer to get rid of it,but as you say garden machinery runs hotter than outboards so thats out,so could i use it the following year?How long does 2 stroke fuel last?
I have never had a problem running last years fuel pre mixed or not!
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Old 29 July 2014, 02:51   #18
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My old 2 stroke fuel always goes in the lawnmower, before that it went in the old Ford Focus - long gone now and we're all diesel now though so the lawn gets cut a lot...
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