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Old 13 September 2008, 17:49   #11
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I hear Optimax's are good on Fuel, however so is the Suzuki too. I bet the Opti's are cheaper to buy and are lighter too. However don't forget to factor 2 stroke oil into the equation.
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Old 14 September 2008, 02:25   #12
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Wot?

Quote:
Originally Posted by Chris View Post
Jon,

I am running a 150HP Etec (2stroke) on the back of a 6.5 I get about .9 litres per mile when crusing at 20-25 knots then at WOT about 54 litres per hour.

If you buy a modern 2 stroke or 4 stroke and ensure it is propped right then you should be able to achieve the same.
showing my ignorance but what is WOT ?
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Old 14 September 2008, 03:19   #13
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showing my ignorance but what is WOT ?
WOT=Wide Open Throttle.
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Old 14 September 2008, 14:56   #14
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we blast around the Solent and kill 1.1L per NM. I think of 20L per hour. Typical trips in the Solent (including stops) means with a 150L tank I fill up every other 2nd or 3rd trip.

I love the Opti grunt especially in the rough and do not find the oil a pain. Just chuck in a bottle every few weeks. No sweat.
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Old 15 September 2008, 05:29   #15
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Quote:
Originally Posted by Tim M View Post
I wouldn't buy another large 2 stroke, simply because buying and filling oil is such a pain.
my pain would be the lot more weight on transom of a 4-stroke ;-)
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Old 15 September 2008, 12:16   #16
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Quote:
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I wouldn't buy another large 2 stroke, simply because buying and filling oil is such a pain.
Not as much of a pain in taking your 4 stroke to the dealers every time for an overpriced service
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Old 15 September 2008, 12:22   #17
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On a trip to the Isle Of Man.......


175 etec 6.7 rib
5 and 1/2 hours round trip
sea state 3/4
126 lts used

you can do the maths
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Old 24 October 2008, 02:52   #18
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On a trip to the Isle Of Man.......


175 etec 6.7 rib
5 and 1/2 hours round trip
sea state 3/4
126 lts used

you can do the maths
Can we conclude that Etec's are economical? I've not managed to get my fuel management dialled in and don't really know WTF it's getting through. According to Chris, I need more electronic gizmos.
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Old 24 October 2008, 03:20   #19
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Can we conclude that Etec's are economical? I've not managed to get my fuel management dialled in and don't really know WTF it's getting through. According to Chris, I need more electronic gizmos.
You must of got a Friday afternoon one
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Old 24 October 2008, 03:44   #20
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if you look on my website ( www.hobbycaptain.at ) you can see my boat (ZAR53) which is comparable from hull length to a normal 6m RIB which has tubes also behind the transom like most UK Ribs.

I owned a Johnson 140 4-stroke (= Suzuki 140) and changed to an E-TEC 150HO.
I am using almost the same fuel with the E-TEC as I used with the Johnson.

Johnson was about 0,4-0,45 l/km , E-TEC is about 0,45-0,5 l/km at normal cruisiung speed between 3000 and 4000 rpm .
Top Speed improved from 75 km/h to 89 km/h (from 40 to 48 kn) and with E-TEC in average at the same rpm I am always 10 km/h faster than with Johnson. This is the major reason for using a bit little more fuel. At the same speed they consume the same amount of fuel.

I never would change back to a 4-stroke any more, I like jumping into plane :-) .


PS: fuel usage is minimum 0,4 l/km with just planing and 2700 rpm (still stratified load) , about 0,5 l/km between 3500 and 4000 rpm (normal cruising speed at about 50 - 60 km/h (27-32 kn) and 0,70 l/km at WOT (89 km/h = 48 kn at 5600 rpm) .
All data recorded with Lowrance 7200C and NMEA2000 engine kit and Navman Powerfuel3100.
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