|
|
Post by willow on Dec 11, 2006 20:49:15 GMT
1st time boat ownership a serious consideration of mine for this coming summer but I baffled by engine economy. Speaking at the Southampton boat show to a dealer he warned me of the red deisel rise for pleasure boaters & spoke of the more efficient 4 stroke outboard but then went on to say about the weight of a 4 stroke is alot heavier than that of a 2 stroke. What is the rule of thumb on engine economy.
Cheers
Bill
|
|
Neil
crew member
'Boat that never leave pond never know wonder of ocean'
Posts: 70
|
Post by Neil on Dec 28, 2006 19:10:37 GMT
Been a while since I owned an outboard boat but I was once told that 1 gph per 10hp at wot
So a 50hp would use around 5 gph at full speed, so if you cruised sensibly this would drop accordingly.
The problem with fuel economy figures is that engines can vary so much depending on loads, hull types, props, etc i have not had experience of a 4 stroke o/b so I cant comment, but have heard they are much better on the fuel.
Personally my advice would be inboard, inboard, inboard.......I am biased though, was converted quite a few years ago and have never looked back.
|
|
|
|
Post by Lavy on Dec 29, 2006 15:57:40 GMT
Neil w is about spot on with his economy figures for 2 strokes.I run a 100hp suzuki and it burns around 10 gph + 2 stroke oil when running flat out. But you can get a long way in an hour.
The next engine i buy will be a 4 stroke ,much more economical but heavier but the extra weight would be offset by not having to carry so much fuel (at 10lb per gallon).
|
|
|
|
Post by squideyebarnes on Dec 29, 2006 16:56:11 GMT
gas converision looks good on outboards now disel has been ruined
|
|
|
|
Post by slippery on Dec 29, 2006 17:18:41 GMT
wat about veg oil conversions? I hear the goverment now wants to tax this alternitive, anyone know if this is true?
|
|
Neil
crew member
'Boat that never leave pond never know wonder of ocean'
Posts: 70
|
Post by Neil on Dec 29, 2006 19:43:00 GMT
There is already a tax on any road fuel, with bio diesel the duty rate for off road use is 3.13 pence per litre as opposed to 27.1 for on road use. This website may be of use to you. www.biodiesel-fuel.co.uk/biodiesel-outlets/ |
|
|
|
Post by eccles on Dec 29, 2006 21:34:47 GMT
Sean and I use a little Suzuki 4 stroke on our little open boat in the summer. It has two advantages as far as I am concerned: 1. It is dead quiet which means we can go over a wreck dead slow and not run the risk of spooking the fish. 2. It seems to use about a pint of juice every half hour but then it is only 6 horse. I know this means that we can't go down to Bullock or south of the IOW but we would not want to go that far out in an open boat anyway.
|
|
|
|
Post by hogster1970 on Dec 31, 2006 8:22:31 GMT
my orkney coastliner with a 20 hp honda 4 stroke used 6.75 lts to do 10 miles, which i thought was bloody good, although she was only pushing 11kts as i couldnt get her on the plane, but im going to be moving the aux to the front next time to see if that helps.
|
|
|
|
Post by squideyebarnes on Dec 31, 2006 12:53:26 GMT
yer thats good also like you say more weight in the front should bring her down and maybee get you on the plane,as thats were true enconomy lies.
|
|
|
|
Post by safeasmilk on Mar 19, 2008 1:17:06 GMT
Been a while since I owned an outboard boat but I was once told that 1 gph per 10hp at wot So a 50hp would use around 5 gph at full speed, so if you cruised sensibly this would drop accordingly. The problem with fuel economy figures is that engines can vary so much depending on loads, hull types, props, etc i have not had experience of a 4 stroke o/b so I cant comment, but have heard they are much better on the fuel. Personally my advice would be inboard, inboard, inboard.......I am biased though, was converted quite a few years ago and have never looked back. Inboard may be great Neil. But not a lot of use if you trailer your boat? |
|
|
|
Post by onemorecast on Mar 19, 2008 13:44:21 GMT
My Orkney Strikeliner with 25HP 2 stoke uses about 1 litre a mile at 11-12 knots
|
|
|
|
Post by backdraft on Mar 19, 2008 20:08:21 GMT
we got a 19.6ft hardy seawings. this use to be fitted with a 60hp mercury 2 stroke. that ran well.this motor was changed for a 60hp marina 4 stroke,witch was bought at the london boat show 4 years ago,the salesman tryed to put us of a four stroke saying it would be slower and we wouldnt be saving on fuel.what a load of cobbs. we took the boat from its morrings in keyhaven up to gosport to have the engine fitted.the trip there we used 3 full tanks, the return trip we did on one tank ,we couldnt belive it faster,quicker pull up and so quite. so as you have guessed we were converted . we also run a shetland with a 100hp yamaha 4 stroke. love em.
baz
|
|
