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Old 27 March 2016, 15:26   #11
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I have a bit of experience of both. Which is best for someone very much depends on a number of factors.

Cost: Diesels are expensive to buy - new and used. Maintenance can be expensive too - but then, green diesel is cheap. The balance will be a personal thing. Old diesel RIBs seem to be very pricey - given that they are going to stick an arm into you financially!

Condition: Old diesels are a minefield. If a leisure boat has been lying about afloat or stored, a whole world of pain can await the new owner. A working boat might be different. I'd prefer to buy a diesel that did 300 hours a year than 30. Outdrives are another matter entirely. They seem to be the weak link in the whole diesel story. Diesels deliver a large amount torque at low revs, and if a diesel boat is driven like a petrol - with sharp and choppy throttle action - then the drive train can receive a lot of stress.

Fuelling: I don't entirely "get" small trailerable (6-7m) open diesel RIBs. Half the boat is engine and they aren't ideal for long distance cruising. They are getting filled at the pumps - might as well be petrol, IMO. It's with the bigger RIB that fuelling becomes important. If they are not being trailered, then the fuel has to be transferred or purchased at a dockside pump. Petrol is rare enough on the water everywhere. TBH, there's not a huge availability of diesel either. It means that you end up fuelling from cans. I've driven around with 400L of diesel or petrol in my van - I know which I felt more comfortable with!

Available boats: Avoid all the Quicksilver engines. You'll see Volvos, VWs, Yamahas, Yanmars and Cummins. Avoid the exotics like Steyr. You'll find quite a lot of heavyish boats running 315hp Yanmar 6LPs. They're fine in most ways, but I find the turbo lag soul destroying (on a heavier boat).

Maybe by the time you're ready - the Yanmar 8LVs will be entering the secondhand market...
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Old 27 March 2016, 15:39   #12
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Interesting comments there willk.
I've not owned an oil burner, but one maybe invited into the stable at some point.

I have 1200ltrs of cherryade on tap in the shed.
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Old 27 March 2016, 15:57   #13
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Maybe by the time you're ready - the Yanmar 8LVs will be entering the secondhand market...
I'd settle for a better exchange rate!

Thanks for all the info.
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Old 27 March 2016, 18:56   #14
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I think willk has pretty much hit the nails on the heads. I'd agree with most of what he says although I've never had a problem finding diesel waterside anywhere usually someone serving the local fishing community who will fill you up if you mention cash
I avoid marinas for fueling as the fuel is usually overpriced
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Old 28 March 2016, 12:38   #15
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By definition a diesel rib with equivalent power will be substantially heavier than an outboard powered boat. This makes driving each a very different experience. Along with that, as willk mentions, is the lack of low rev power and you can find yourself in a big(ish) sea where you can't overhaul a wave so you can only move at wave speed. Sometimes this is very little above planing speed but on larger waves it can be 30kts. This might seam fast enough but you'll not be able to climb the hill in front of you and you'll be stuck in the trough until the following wave lifts you and provides a hill to run down, this for you to repeat over and over on a long journey can be hard work. It's more a power to weight issue than a diesel petrol issue.

However, I do feel much safer sitting on top of 500lts of diesel than 500lts of petrol.

I've not had a problem finding diesel fuel and I've found a number of oil supply companies run a large van containing a diesel tank and pump and they'll meet you at a harbour. Payment is usually through the telephone with the parent company and your credit/debit card.

It's kinda one of those things you need to try for a while so you weigh the pros and cons for yourself.
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Old 28 March 2016, 12:59   #16
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However, I do feel much safer sitting on top of 500lts of diesel than 500lts of petrol.

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I find this whole petrol 'bomb' thing a little daft. If it were the case, we'd have 1000s of potential explosions permanently trundling around our roads.

A fire on any boat is a serious situation, gas cylinders then become potentially more dangerous.
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Old 28 March 2016, 13:19   #17
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The flash point of petrol is -42degs (ish) diesel is over 50 degs so in relative terms petrol is much more likely to go boom.

I think petrol cars are a different proposition. Both in terms of basic design requirements and subsequent diy electrics.

That said I havea petrol boat and I'm not expecting any big bangs.

Google Opel Zafira fires
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Old 28 March 2016, 13:50   #18
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I find this whole petrol 'bomb' thing a little daft.......
I know what you mean but a boat engine is a whole lot more vulnerable than a car engine, especially so since it's effectively in a container surrounded by air and therefore only a minor electrical spark would be required for ignition if petrol became free in the engine compartment. Just the day to day maintenance of the engine ensures some fuel or fuel vapour in the engine campartment and sparks will be freely available at the alternator slip rings!
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Old 28 March 2016, 14:56   #19
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I know what you mean but a boat engine is a whole lot more vulnerable than a car engine, especially so since it's effectively in a container surrounded by air and therefore only a minor electrical spark would be required for ignition if petrol became free in the engine compartment.!
I've lived in a high volume leisure boating area for all of my life, it's NEVER happened.
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Old 28 March 2016, 15:22   #20
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I've lived in a high volume leisure boating area for all of my life, it's NEVER happened.
Hehe, that's lucky! It will, there's always a first.
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