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Old 16 June 2013, 12:34   #11
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A 2 strokes engine consumes 12% gallons of it's rated HP at wot. Used to be stated at 10%, but that's a very conservative %, better have more fuel remains calculating at 12% than none at 10%. A good fuel economy would be running 4000-4500 rpm at wot on flat, no wind water conditions.

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Old 16 June 2013, 12:37   #12
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Quote:
Originally Posted by ian parkes View Post
A few times you mean not that often .

be honest to the poor fellow now , he has to find out soon hopw much a 90 2 stroke really uses especially of you are havin some fun . He won't always have flat calm and following wind and tide .
I say fill those cans and allow for 1.5l a mile
... SHITE! Matt h is'nt the Only one then!...Just goes to show how much Outboards have progressed...my Suzuki 250 even in Rough or Raceing has'nt got near 1.5 litres a Mile!!
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Old 16 June 2013, 12:49   #13
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Originally Posted by ian parkes View Post
A few times you mean not that often .

be honest to the poor fellow now , he has to find out soon hopw much a 90 2 stroke really uses especially of you are havin some fun . He won't always have flat calm and following wind and tide .
I say fill those cans and allow for 1.5l a mile
That run we took to the Eddystone,I worked out it was doing about less than 1 mile/litre in the flat calm when we were running at WOT, and it's propped just right.

If I cane it in the rough it uses more.

If I slow up , it does more than a mile per litre.

If you take 3 tanks, plan on only using 2...
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Old 16 June 2013, 12:55   #14
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Ok, that gives me a rough idea... So.....next question...what sort of rpm range do we use for cruising? I'm not even gonna ask what rpm I shouldn't exceed!?! RAMMING SPEED!!
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Old 16 June 2013, 12:59   #15
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for my SR = 3500-4000rpm
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Old 16 June 2013, 13:07   #16
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That run we took to the Eddystone,I worked out it was doing about less than 1 mile/litre in the flat calm when we were running at WOT, and it's propped just right.

If I cane it in the rough it uses more.

If I slow up , it does more than a mile per litre.

If you take 3 tanks, plan on only using 2...
I remember that day , it was a typical cruise on a calm day we all set off steady and slowly the throttles get pushed a bit more until I at least was flat out .
same thing happened last summer my daughter and her boyfriend have a 5.3 chinook with a lovely old yam 85 we cruised for about 6o miles and slowly steady turns to faster then you hit some cop etc and have some fun They used well over 1 litre a mile come the end of the day at least 1.5 When i had a go in that old chinook i could tell why , it just feels so understresed , even at wot its just doesn't feel like its working at all
I reckon the differerence with old carbed 2 strokes between going steady and driving them hard is almost double the fuel

Agree with bushrider there keep it below 4k and its good , my tohatsu 50 is really good on fuel cruising under 4 k and thats really just a smaller version of the same engine , ie 3 cyl 3 carbs
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Old 16 June 2013, 14:50   #17
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my daughter and her boyfriend have a 5.3 chinook
Caja?! She's about 10!
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Old 16 June 2013, 14:50   #18
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Sorry for thread drift, but for your info, below is a table for current fuel consumption of my Capelli 32 WA (hard boat) 10m with 2x250 Yamaha's. Fuel burn about 50-55 lph @ 23-25 kn popping up to a cheeky 190 lph @ 44 kn (havent spent too much time at that speed!)



Hours Used LPH Journey
09/12/2012 1.00 35.00 35.00 Torquay-Dmouth
10/12/2012 1.00 35.00 35.00 Dmouth-Hallsands
11/12/2012 1.00 10.00 10.00 Dmouth-Bness
20/04/2013 4.70 80.50 17.13 Dmouth-Start Point
21/04/2013 2.70 61.30 22.70 Dmouth-Torbay
28/04/2013 3.00 19.80 6.60 Bness-Dmouth
29/04/2013 3.50 176.20 50.34 Dmouth-Guernsey
30/04/2013 2.20 78.80 35.82 Guernsey-Jersey
01/05/2013 1.90 77.20 40.63 Jersey-Guernsey
01/05/2013 4.00 189.80 47.45 Guernsey-Dmouth
02/05/2013 0.80 7.20 9.00 Dmouth-Bness
31/05/2013 3.00 41.00 13.67 Bness-Scabbacombe-Dmouth
01/06/2013 2.10 44.40 21.14 Dmouth-Salcombe
02/06/2013 3.80 90.40 23.79 Salcombe-Thurlstone-Dmouth
03/06/2013 0.50 6.00 12.00 Dmouth-Bness
35.20 952.60 27.06
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Old 16 June 2013, 17:11   #19
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Caja?! She's about 10!
caja is 13 now mate , I have 2 older daughters in their mid 20's . makes me feel old, been a grandad for 3 years now
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Old 16 June 2013, 17:13   #20
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caja is 13 now mate , I have 2 older daughters in their mid 20's . makes me feel old, been a grandad for 3 years now
Blimey. Our youngest Megs, is now 17 and driving.
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