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Old 29 August 2001, 15:26   #11
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Hi Nick,

Good to hear that you are happy with the engine! Your RIB is rather large and it's encouraging to see that the small MerCruiser diesel is capable of pushing it!

Alan, I don't think you'll find any lighter inboard. This is as light as it gets, gasoline engines weighing roughly the same.

Staying with inboards, what is the general opinion on diesel vs. gasoline? Say that I can't afford a diesel, so I have to choose between a gasoline inboard and an outboard. Is the inboard a better choice? Seaworthiness and safety are of main concern here. Still assuming we are talking about a 6.5 m - 7m RIB.
Sasa
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Old 30 August 2001, 06:15   #12
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Hi Sasa,

I just love filling up with red diesel at 34 pence per litre (minus marina discount) and then seeing a simialr size RIB fill up with petrol at something like 90 pence per litre.

I'm not sure that I would enjoy going out quite so much if I had to pay such a high price for fuel.

I saw a guy fill up his 'gin palace' the other day and he looked like he was almost in tears at the bill. He was only going around the Isle of Wight and it was going to cost him 100's to do it.

Yep I love my diesel....
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Old 01 September 2001, 04:36   #13
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Sasa and Alan.


Just to prove how good this engine is.........I filled up yesterday and put a total of 16 1/2 gallons of red diesel in at a cost of about 23.

That equated to just over 17 hours of boating.

This was a combination of slow (4-8 knot and about 4 miles or so) through harbour restrictions and anything up to 30 knots out on the big stuff. Weather has generally been 3-5 with some big stuff over the Chichester Bar.

If I had filled up with petrol that would have cost about 71


Even with the extra cost of purchasing a diesel over a petrol engine, when you look at these figures it would pay for itself in no time at all.

Nick
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Old 04 September 2001, 14:24   #14
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Consider yourselves as happy ribsters

In Greece even though we are in the same EC petrol has similar price as diesel. It is a little more expensive but no way like in UK.
Even worse, only proffesional boats are allowed to use diesel. In other words NO ribs.

Michael
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Old 04 September 2001, 14:56   #15
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Skiing

The big drawback obviously is performance! You simply do not get the same low-end torque with diesel when attempting to pull someone' out the hole' - particularly with mono-skiing!
Comments??
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Old 04 September 2001, 15:04   #16
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Stealth

I think that the low end torque has nothing to do with the skier pulling. What you need there isn't torque. You need immediate response to the throtle. That's what you haven't got with diesel.

Michael
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Old 05 September 2001, 03:50   #17
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Well all I can say is that I think my boat would pull your arms right out of their sockets if you wanted immediate acceleration chaps.

It may not be quite as quick as a petrol outboard but it will do the same job, longer and more cheaply.
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Old 05 September 2001, 04:27   #18
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Nick,

I can't agree more with you. And more reliable too !!

Michael
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Old 06 September 2001, 14:04   #19
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nickfarmer

Thanks guys ...... I am totally confused now!
A 8.1m - 8.5 m RIB used for long and short range (fast) cruising, water-skiing and general pottering - what sort of diesel engine and set-up would you recommend?
We were going to hang an Optimax 225 off the back!
Please advise!
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Old 06 September 2001, 15:09   #20
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I reckon that an outboard would be better for waterskiing. It was your comment about torque that got people arguing!

Diesels have bags of torque, and will pull like a train once they get going, but as Michael said it's the immediate response that only an outboard will give you.

I suspect that with petrol cheaper than water where you are you'll go for the outboard in the end, but a Yamaha 240 or Yanmar 300 would both do well in a boat the size you are looking at.

John
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