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Old 07 September 2009, 11:26   #11
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Country: UK - Scotland
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Make: Redbay 11m Cabin
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Engine: 2 x Yamaha422Sti 275
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Quote:
Originally Posted by jwalker View Post
This is not the case for all Volvo engines but it is the case for the ones you are likely to find in a rib; the engines use both a supercharger and a turbo charger. The supercharger runs at low speed and the turbo takes over at higher engine speeds. This arrangement prevents the turbo lag and lack of throttle profession which is a feature of some other diesel engines. Reliability of the system is good.
I would agree with Jeff, the system is good but like any system when one component fails it all goes to pot. When the supercharger fails you cannot get the boat on the plane unless you tow it fast enough to get the revs up to allow the turbo to come in.
Go for the Yamaha which doesnt have that problem.
HTH
Andy
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Old 07 September 2009, 11:37   #12
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Thanks

for that.
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Old 07 September 2009, 12:27   #13
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Ooops... profession = progression just in case you hadn't sussed it.
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Old 11 September 2009, 09:22   #14
B36
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Boat name: sorry-hate boats
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Originally Posted by rupert View Post
I am finally looking at a couple of boats which are close to my desired specs. I just wonder if anyone could give an opinion on used diesels (turbo-charged)? I am sure they would be costly to replace, but are they prone to probs after a year or three?
And anything else to watch out for?

Thanks,
rupert.
Yanmar 6LP/BravoX makes a good combination. Bravo1X 1.50:1 Revo4 prop.

All the problems you hear about are related to owners who treat their boats like cars, soon as they have finished thrashing it to within an inch of its life shut it down and walk away! They also shout loudest when things go wrong.
Crack block issue was on early LP's Only happens through abuse. all LP's are fitted with factory brace.
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Old 11 September 2009, 21:12   #15
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Quote:
Originally Posted by chewy View Post
Bit like any engine really, if its looked after it'll have a long life. Quite a few marine diesels are marinised car and truck engines.
Almost all marine diesels up to a certain size are marinised versions of truck engines, although some installations are truck engines that are adapted (marinised?) and start a new life in boats.

Most diesels used in leisure boats are very highly rated, powerwise, in comparison with the truck engines they are based on. For instance, the Volvo D12 can be rated up to 715 hp in comparison with the 440 in a 44 tonne truck.

The Cummins B-Series 5.9 can be had with something in the order of 425 hp as opposed to about 250 in an 18 tonne wagon.

The IVECO website lists all its marine diesels in a number of different specs, depending on the kind of use.

http://www.ivecomotors.com/en-uk/Pro...ages/home.aspx
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Old 11 September 2009, 21:24   #16
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Originally Posted by JSP View Post
Can recommend Mermaid. Dads got two 6ltr lumps in his boat and they are great engines.
I'm pretty certain they are based on the Ford 6 cylinder that used to be found in the Ford D-Series from the late '60s into the late '70s and the first generation Cargos.

Good, reliable motors, with simple 2 valve heads and rotary injectors.

The only thing I can think of that would stand against these engines in a RIB is the power to weight ratio. The 3 litre IVECO or 2.5 Volvo
might be more useful for leisure use.

http://www.ivecomotors.com/en-uk/Pro...es/S30230.aspx
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