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Old 15 July 2013, 09:12   #1
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What size engine ?

Im starting to look for a RIB, narrowing down the choice and thinking about what i want it for.

Now Im close to a size 6-7m, I need to start to think about what size engine. I plan to use it for cruising round Corsica, diving and just exploring the coast. Me and my wife, two - four others max.

Watersports, diving and fun.

All the boats I look at show a range of engine sizes (typically say 90 up to 150), but Ive no idea what would work best - I dont want to be thrashing a small engine too much, or spending too much on fuel costs for a very fast one if I just go cruising.

I dont really know what size I need for the boats use and expected carrying capacity.

Any thoughts / guidence would be great.
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Old 15 July 2013, 10:20   #2
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My personal opinion is to fit whatever the max rating is, or just a shade under. An underpowered boat is a perpetual disappointment, it's better to have the horses & not use them( yeah right) than wish you had.
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Old 15 July 2013, 10:39   #3
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Have to agree with dave on this one also if I was you I would be looking at 2stroke not 4 so for example the Tohatsu TLDI, Evinrude Etec or Merc Optimax these are all obviously lighter than 4 strokes and offer a better power to weight ratio.
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Old 15 July 2013, 10:44   #4
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Originally Posted by mattvolvo1 View Post
Have to agree with dave on this one also if I was you I would be looking at 2stroke not 4 so for example the Tohatsu TLDI, Evinrude Etec or Merc Optimax these are all obviously lighter than 4 strokes and offer a better power to weight ratio.
Ohh! It'll kick off now
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Old 15 July 2013, 10:57   #5
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OK, bigger is better but I dont have to cruise around on full throttle - that makes sence.

However, I thought a 4stroke would be better - lower fuel use, quieter, longer lasting, longer service intervals ? I also thought there were issues regarding emissions etc.
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Old 15 July 2013, 11:27   #6
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[QUOTE=Trimix;554923]
However, I thought a 4stroke would be better -Depends on your definition of "better"
lower fuel use, Nothing between 'em these days
quieter,Probably, but I LOVE the sound of mine
longer lasting,Hmm, not sure where you got that from
longer service intervals, No way, 3 years or 300 hours, no 4 stroke can match that?
I also thought there were issues regarding emissions etc. Nope! a certain make which shall remain nameless in the interest of impartiality, was the 1st brand to get the C.A.R.B. 3 star rating, which is some Californian emissions bollix, but it beat the 4 strokes to it. It was; dunno if it still is; the only 2 stroke outboard allowed on Lake Constance due to its emissions falling below EU 4 stroke requirements[/QUOTE]
Don't rule out 2 strokes, but ultimately buy what suits your needs & pocket.
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Old 15 July 2013, 11:47   #7
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OK, thats interesting. I wont rule out 2 strokes then. I now need to get some performance info on engines, just to make the buying process even more complicated.

More choice just slows down the decision making process.
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Old 15 July 2013, 11:56   #8
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I have to agree with everything dave just said! a man after my own heart!
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Old 15 July 2013, 12:14   #9
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Quote:
Originally Posted by Pikey Dave View Post
My personal opinion is to fit whatever the max rating is, or just a shade under. An underpowered boat is a perpetual disappointment, it's better to have the horses & not use them( yeah right) than wish you had.
Or even a Shade Over!....Most manufactures use the same Block for several Power Options,weight, handling, and Insurance Cover are defining considerations too....IF they ALL stack up why deprive yourself!?...
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Old 16 July 2013, 04:35   #10
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OK, so now Im starting to look for a massive engine

Dumb question time - do all engines quote the power properly ? So a 200 Yamaha is the same as a 200 Honda / Mercury etc ? And I assume its horsepower ?

Will they have comparable torque levels, or is it all down to horsepower ?

The other assumption you can correct for me is fuel consumption, I would have thought a 2 stroke would use a lot more fuel than a 4 stroke ?
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