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Old 22 May 2006, 04:04   #11
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Originally Posted by antiqueboy
in my quest for a bigger and better boat, an idea of fuel consumption would be good as i dont want to over stretch in my need for speed. ie
from northeney, hayling island to cowes and back(40 miles?) on my medline 1 4.8 meter with 65hp suzuki i use about £40 flat out where possible.

what do others use use both petrol and deisel over a given distance.
xr2 from northney to cowes and back £70 plus oil £15
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Old 22 May 2006, 07:52   #12
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Couldn't say in terms of miles per gallon but the fuel consumption on my 115 is scary at higher speeds, cruising at 18-20 knots not too bad, go to 25 and it seems to more or less double, go to 30+kt and it seems to double again!!

The tank on mine is about 80-90 litres I would guess (never emptied it completely but have put 60lt in when showing about 1/4 full on the gauge) and I have used 1/4 tank in an hour and a half pottering round mostly at 10-15 knots then another 1/4 tank in about 20 minutes at "yeeha" setting

If I ever had to replace the engine, or ever got another boat, I think I would go for a four stroke on the basis that it must be more efficient (hard to be any worse!!) and the fact that I don't really like 2 stroke engines anyway
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Old 22 May 2006, 12:29   #13
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Optimax fuel comsumption

Last trip out, was Felixstowe to Snape and back, approx 42 miles with lots of blasting in waves. used just over £40 of fuel and hardly any oil. cruising at 35kts

After having an Optimax i wouldn't want anything else
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Old 22 May 2006, 13:21   #14
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i appear to have the same consumption figures as yourself, using around a litre of fuel per mile but i suspect my oil consumption will be a lot lower given the total absense of smoke from my engine, from a smoke point of view you would think it was a 4 stroke

and that will b cruising around the 35-40 knots range

is a 200 hp opti on a vipermax 6.5

Quote:
Originally Posted by antiqueboy
in my quest for a bigger and better boat, an idea of fuel consumption would be good as i dont want to over stretch in my need for speed. ie
from northeney, hayling island to cowes and back(40 miles?) on my medline 1 4.8 meter with 65hp suzuki i use about £40 flat out where possible.

what do others use use both petrol and deisel over a given distance.
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Old 23 May 2006, 04:33   #15
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The two strokes people seem to love on this site are usually new tech 2 stroke and they are great engines. I still think the best engine around is the three pot Yamaha two stroke range (60 -90) but thay can be a bit thirsty.

I chartered an old Yammie 250 2 stroke engined rib last week. Drove 5 people about twenty miles and had about 4 miles of one to one ....... Fuel Bill 93 pounds and 22 pence and that was from a garage not a pontoon. So big old two strokes are not able to compare with 4 strokes.

I've run Opti 150's and 225's and I feel fairly certain that the 150's are more frugal than the 225's ( on a LPH:HP ratio)

Having said all that I manage a floating Jacuzzi (Zebidee) which has a 75 merc 4 stroke and that gets to Yarmoth and back on about 30 litres and that is most impressive
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Old 23 May 2006, 14:20   #16
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Rogue wave,

I was also impressed with the consumption on Zebedee. Do you know if all Mariner 75 4 Strokes are like that.
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Old 23 May 2006, 17:01   #17
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I think they probably are Nick, but it depends on boat weight and design also. put that engine on a boat that's a couple of hundred kilo's heavier and the consumption will go to pot.

Interestingly enough I believe that block and gearbox is the same as Benc has on his Tornado, which is a tammie 115. I think they run it at 75 with carbs and 90 100 and 115 with injectors. I am not sure cos I haven't looked at outboard brochures since i got a copy of the Cromwell catalogue. ( and that really is tool porn of the highest calibre ) No you can't borrow the catalogue not even Mark halliday is ready for that much stuff!
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