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Old 07 May 2004, 04:10   #21
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Country: UK - England
Town: Brixham, Devon
Boat name: FLY-BY/FLY-BY II
Make: Ribcraft/Avon
Length: 6m +
Engine: Honda 175/Yamaha 30
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Hopefully getting the new Ribcraft 6.5 in the next few days with the Honda 175 on the back. I have got a fuel flow meter fitted so will give you all some feedback from this model.
I have had a Yamaha 200HPDI for the last 3 years, it was a bit of an animal for beginners though. Excellent response in rough weather. Fuel consumption on this model was pretty good, most of the time it was ticking over doing slow speed handling and never hesitated, misfired etc.
I have gone for the 4 stroke as I will not have to bother with filling up with 2 stroke oil, quietness when teaching & much of the time it will be ticking over.
Torbay Harbour Authority are having a 225 on the back of their new Ribcraft 6.5 in about a month so we will be able to compare consumptions as the 175 & 225 is basically the same engine.
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Old 07 May 2004, 04:10   #22
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Country: UK - England
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Comparisons

How about posting some figures?
Starting at the bottom.

Tohatsu 140. 1700cc, 2st quad carb. 135Kg. WOT = 52 l/h + oil
0.37 l/hp/h
Next.........?
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Old 07 May 2004, 04:26   #23
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Okay, from experience with fuel flow meter, 6,5m ribtec with Mariner 150 v6 carb engine 45 LPH same as the Honda Camel combination at WOT.

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Old 07 May 2004, 04:29   #24
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Country: UK - England
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Boat name: Ballistic
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BWM DS 18 + Yam 130 @ 167Kg, 1800cc WOT 60lph.
BUT @ 4000 RPM = 40lph

Osprey Viper 6mtr + Opti 150 @ 197Kg, 2500cc WOT 55-60lph
BUT @ 4000 RPM = 25lph
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Old 07 May 2004, 04:35   #25
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Daniel - I think you're 100% correct. Noise and long times at tickover would be the main reasons to sway me towards 4-stroke engines, although I'll remain a 2-stroke fan as I like the performance!

Getting back to the question that sea bass asked, I think that another benefit of four-stroke in this situation is the lower pollution. Even though modern technology (hpdi and optimax) gives more precise oil injection, you can't argue with zero oil emission from a 4-stroke.

Interestingly, I visited sea bass's island last year and was quite interested to see what outboards were used. Yamaha is the most popular engine around. And most commercial operators use four stroke engines. The most popular 4-strokes on commercial craft appeared to be Honda, but many of the shiniest new engines were Suzuki. Perhaps this is because of local dealership and servicing?

Also, if fishing is the main use for a new RIB you may want to look at RIBs whose tubes are in the water at rest for better stability.
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Old 07 May 2004, 05:28   #26
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Rogue.. still running in (and saving up for the 20 Hr service- 8 hours labour!).. but just pootling about at 25 ish knots useing 35+ LPH/ 1.4 L/Nm... frightened to put on a flow meter now .. still the occasional burst of full throttle gives big "Grin Factor".. sod the expense....
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Old 07 May 2004, 05:37   #27
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Quote:
Originally Posted by Jono
saving up for the 20 Hr service- 8 hours labour


First service for an optimax:

- Drop lower unit, check water pump, change gear oil
- Full grease up
- Plug into DDT and check

That's it
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Old 07 May 2004, 05:40   #28
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Sod off ya smug git and do some work!.....
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Old 07 May 2004, 05:49   #29
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Quote:
Originally Posted by Jono
20 Hr service- 8 hours labour...25 ish knots useing 35+ LPH/ 1.4 L/Nm...
If your Suzuki dealer charges 45ph for labour that's going to be one expensive service - certainly more than my annual service (labour charge for mine was 175). And you & Ian are quoting fuel consumption figures that won't get you jobs as Suzuki salesmen
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Old 07 May 2004, 05:51   #30
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Quote:
Originally Posted by Jono
Sod off ya smug git and do some work!.....
he doesn't have to he's in IT
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