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Old 21 October 2003, 15:08   #1
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mercruiser 1.7 diesel 120 hp

Looking to put one into a 7m.
Enough power ? What alternatives should I consider.
Any comments would be appreciated.
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Old 21 October 2003, 15:25   #2
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Enough Power

Hi Peter,

Welcome to Ribnet.

IMHO the mercrusier engine is a surperb piece of kit, Idealy suited to a Rib 6.0 to 7.0m.

From experiences in friends boats crusing speed is 25knots comfortable and will run all day & night. Top speed is 30-32 knots with a 21" prop.

Running costs are 1 litre per nautical mile. Enconomy and Durability all in one engine.

However, depending on your requirements there are bigger diesel engines & drive units out there. Furthermore, with the development of the PASSAT Turbo diesel engine and the new Volvo Diesel only time will tell how good these engines are, I do not think they have been proven yet on reliability or durability.

I hope that is of some use.

Regards
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Old 21 October 2003, 16:56   #3
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Hi Peter

welcome to the forum

I hv a Parker 630 with the Mercruiser 1.7 TDI linked to the Alpha One drive. It is a superb engine and having done 180 hours since August 02 I know what I am saying. Like Kevin said max speed on a 6.3 mtr rib is 32 knots and comfortable crusing speed is 24/26 knots

You say you want to fit the engine in a 7 mtr rib . What make?

the total weight of my rib with full fuel (100 ltrs) is 1050kg

Mike C has a Humber 630 with the same engine and I am sure he will add his own comments

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Old 21 October 2003, 17:36   #4
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Looking to buy a Ribcraft 7 m, will 120 hp be enough,or should I go upto a Yanmar 240 ??
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Old 21 October 2003, 17:48   #5
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How heavy is the Ribcarft Hull?
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Old 21 October 2003, 18:18   #6
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Hmm, just had a look at Ribcraft's package pricing...

Save yourself 476 and go for either the Yamaha200hpdi or the Optimax225. The 476 can go towards the first year's fuel bill, then after the marine duty exemption expires in a couple of years, you'll be in the same situation at 1 litre per mile, but you'll still have a big grin on your face on a Monday morning after every weekend on the RIB.

Go on, you know it makes sense!
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Old 22 October 2003, 05:31   #7
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Peter24/7,

It looks like your going through the same decision making process as me - but you are a bit closer to actually spending the cash!!

I've looked at the various threads on petrol vs diesel (originally I wanted a 7 - 8 m RIB with twin O/B petrols), but it all seems to come down to diesel engines being expensive to start with, but you recover the cost in cheaper fuel and resale value (if you use it enough).

If fuel duty really is to be applied to diesel for marine usage - all the benefits disappear in a puff of (black) smoke. Having said that, I can't find anything definitive on when (or if) it is likely to happen.

I still want a diesel 7-8m RIB - but Richard B's post is making me a tad uncomfortable.........
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Old 22 October 2003, 05:38   #8
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Diesel better for safety every time, but for boats under 8m the economic argument, whilst currently strong, will disappear whilst the UK remains in the EU, albeit in a half-hearted manner.
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Old 22 October 2003, 06:27   #9
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Louise,

Is the changing duty on marine diesel a European thing then?

If the EU can mandate the duty laws, why can't they give us cheaper fuel in the UK?!? Just a thought...
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Old 22 October 2003, 06:42   #10
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Quote:
Originally posted by peter 24/7
Looking to buy a Ribcraft 7 m, will 120 hp be enough,or should I go upto a Yanmar 240 ??
I wouldn't put the 120 into a 7m boat. It's just about OK in a 6.5 metre RIB, but they're not quick.

As well as producing a disappointing performance, under powering your boat will also affect the resale value when the time comes. I reckon you'd be better off all round with the 240.

John
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