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Old 04 January 2004, 02:40   #1
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Inboard Diesels

I have been running an inboard diesel rib for three years now and have had great fun, fishing, cruising, taking photos, wakeboarding, donuting, (yes behind a smelly diesel), better than behind a smelly two stroke! I am running a 5.8 mt rib with a Yanmar 4LHDTE on to a Castoldi 05 Jet. No Major problems (touch wood). I have been looking around to upgrade to something bigger and have noticed, several 7mt ribs by various builders for sale, running the new Mercruiser 120hp diesel. This engine has only been available for a year or two and I haven't heard any comments about it at all. Has anyone had any experiences of these engines, good or bad,they would like to share. I am a bit concerned as there does seem to be rather alot of them for sale at the moment. Are they under powered? Are they uneconomical? Are they expensive on spares or servicing? Thanks in advance and if anyone is interested in a small diesel jet drive let me know.
justin@pclimited.freeserve.co.uk
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Old 04 January 2004, 04:47   #2
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Hi

I am supposed to have the 120hp merc coming in a 6.5m Prosport. But considering upgarding to the new volvo D3????
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Old 04 January 2004, 09:23   #3
nik
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diesel

Hi Juspalm,
I too have been looking for diesel ribs and was quite interested by the mercruiser 120d. I have heard both good and bad reports about it, although nothing specific. I believe it is a marinised astra engine. But what is putting me off is that I am not convinced that it is powerful enough.
What does interest me more is the Steyr diesel engine. It is a 2133cc engine that comes in 3 flavours 2@ 144 hp & 1@164 hp. And it is about the same size and weight as the mercruiser. They come in at around 12k, which I think is more than the mercruiser.
The volvo kad32dp is also interesting because it has a supercharger. But it is a bit bigger, heavier, and more expensive. Also some people dont seem to rate volvo after sales.
I must say though I have only seen these engines on stands, I have not seen them in action.
Hope this helps, Nick.
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Old 04 January 2004, 10:28   #4
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Steyr

I have been driving a lot of Steyr (212 and the 246) and i just love them, it`s a very reliable engine.
The only problem we have here in Sweden is that there is very few places to get parts, service etc.
Before buying i have to recomend you to check around were you have your boat that there is a service station.
One good thing to here from a guy in Sweden (service station) is that it`s hard to sell them because you never have any engines that brakes down so they get some work on the engines, they only earn money of selling the engines and service, no other jobs.
Good commercial for the engines but the problems comes to find a service station.
No coments of the Volvo, i am swedish so you know what i say, buy it
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Old 04 January 2004, 10:59   #5
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Mercruiser 1.7

Andre has one in his Parker and is pleased with it. He has commented here before how ideal it is for a 6-6.5mtr boat but prob not big enough for anything bigger.

I know a guy with one in a 6.5m Humber which he is very pleased with and i was impressed with the top speed. His quoted economy was exceptional as well.

I beleive Mike C also has this engine in his 6.5ish mtr Humber.

Of these three i don't know of any problems, and i think we would have heard if there had been.
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Old 04 January 2004, 11:22   #6
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Mike C had a small problem but that was due to poor installation by Humber

Also humber claim top speeds of 46 knots in a 6m ocean pro.
Bull*hit in my opinion but id like to ask andy roffee about it.
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Old 04 January 2004, 12:11   #7
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WHERE AND WHEN DID HUMBER SAY 46KNOTS?
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Old 04 January 2004, 12:49   #8
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Thanks Guys it's all helping !! I have heard of a small percentage of engine being hard to start? anyone heard this?
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Old 04 January 2004, 13:30   #9
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Quote:
Originally posted by Juspalm
Thanks Guys it's all helping !! I have heard of a small percentage of engine being hard to start? anyone heard this?
If you mean the Mercruiser 1.7L TDI then this is rubbish - no starting problems . I have done about 187 hours and have not experienced such problems or any problems. Do a search on this engine and you will find a few threads refering it.
From memory no negative opinions.

I would highly recommend it for a 6-6.5 mtr rib

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Old 04 January 2004, 14:37   #10
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Hi Juspalm,

If you are running a 170hp diesel now in a 5.85, why on earth do you want to consider a 120hp in a 7 metre boat?

I imagine that the relatively more comfortable ride in a bigger boat will make it seem slower than your current one, even if the top speed is identical (which is very unlikely).

I should have thought that the loss of performance is likely to make the whole experience less fun!

Regards,

Chris.
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