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Old 24 November 2015, 06:20   #1
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Country: Australia
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Powering a 5.8m RIB.

Hi all.

I am soon to be purchasing a new 5.8m RIB to replace my 4.2m toy.
I will use this boat mainly for spearfishing but also want to be able tow wake boarders.

My last 2 engines have been 2 strokes (Mercury 30 and a Yamaha 40). I have had no problems with either of them but the noise and the taste of burnt oil in the water is less than desirable. Fuel consumption has not been a huge issue for me as the majority of my diving is done less than 20km from the boat ramp. I do get out between once a week and ond once a fortnight on average.

I am not sure what engine to look at that will tick the boxes.

- Mid price range.
- Enough torque to pull a fat man out of the water on a wakeboard.
- Would like a quiet motor that is clean burning.
- Reliability is a must. I am not interested in cheap motors and would prefer to stick with the big 4.

The boat is rated 90-150. I am thinking a 90 2 stroke or a 115 4 stroke but am unsure. Any advice will be greatly appreciated.

Kind regards

Darren.

PS, here is my old boat:

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Old 24 November 2015, 08:09   #2
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Country: USA
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Get a four stroke .....the criteria your wanting .....a four stroke is the ticket
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Old 24 November 2015, 09:28   #3
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If you are going to do your own servicing check out the Mercury Mariner warranties
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Old 24 November 2015, 09:46   #4
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Quote:
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.. four stroke is the ticket
Like a parking 'ticket', frustrating followed by annoying.
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Old 24 November 2015, 09:54   #5
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Quote:
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Like a parking 'ticket', frustrating followed by annoying.
Same can be said about two strokes - I've been on 3 boats over the years where the large (150/200hp) 2 stroke has let go and the innards of the engine have come out with a bang - not huge hours on them either.
I have to say I'd be very reluctant to go back to one.
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Old 24 November 2015, 12:30   #6
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Country: UK - England
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I had a 6m commercially built ribquest 2.4m beam with a 90 Suzuki 4st 40 knots best I got out of her 70lts fuel 2 large adults and a dog usuall kit 100 miles 36 Lt of fuel used.

Cheers
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Old 24 November 2015, 12:49   #7
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jeff, are you sure about those numbers?

i had a 5.6m avon adventure, fair to say nothing commercial about it and would be substantially lighter than a "commercial" ribquest and a 100hp mariner 4 stroke EFI and the same size fuel tank. Also not as deep a V perhaps too........

correctly propped (6k max) i never seen remotely close to 40 knots, mph yes. I must admit it was brilliant on fuel, but not that good!
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Old 24 November 2015, 13:28   #8
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jeff, are you sure about those numbers?

I must admit, I'm struggling with those numbers meself😏

DF140a on a RC 545. 38kn tops. 1.2nm/l if I'm gentle. Did Dave Rose mix fairy dust in with his gelcoat😄


.....sh1t happens.......
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Old 24 November 2015, 13:32   #9
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Positive 45 mph on the gauge spoke to Dave rose at ribquest who confirmed that was the best they got, I will say conditions were spot on 13.5 x 21 SS prop fuel consumption with out dought round Jura on RR started with full tank and topped up from jerry cans. Wishing I hadn't sold her now but got a sib with a lean burn Suzuki now that's even better, up to now run it for four hours on 3 Lt of fuel so the new bigger engines will be even better than mine 2009 90. The hull makes a lot of difference the new super sport ribquest is even better wider body more room to walk round.
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Old 24 November 2015, 13:47   #10
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a friend of mine has that same engine (2010 model) on a northcraft 6m and it will just shade 40mph with a downhill wind, it has 2 single seats/70l tank so a VERY light boat, that is not a "commercial spec" boat either, he is circa 0.6 litres per mile, which is similar to my old avon 5.6.

the gauge has to be over reading for speed. was it the water pickup in the engine you were using per chance?

i found a report on a ribquest 5.8 with 115 yam 4 stroke and it was 38 knots on GPS.

something doesn't add up, you shouldn't have sold it if those were the numbers!
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