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Old 18 January 2007, 17:33   #31
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
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Quote:
Originally Posted by GuyP View Post
The question is though, as the 150hp is quite a bit heavier than the 140hp, would the extra 10hp make up for the weight disadvantage? I doubt it - add in the extra cost of the 150hp and I think the 140hp would be the better choice all-round. The 175hp is a totally different proposition of course.
Don't agree here.

An extra 700-800 cc will give a load more torque, which will make the boat far more manageable, when playing in the rough stuff.
There's a lot written about the 140 Soozook only churning out around 127hp, which wouldn't surprise me, as it's only 100cc or so more capacity than the 90/115 motors. Also, if you read some reports on comparisons between the 150 and 175 Soozooks, the testers report very little performance difference between the two. Essentially the 150/175 are the same powerhead, but the 175 has variable valve timing.
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Old 18 January 2007, 19:29   #32
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Country: UK - Wales
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Boat name: DynaMoHumm/ SRV/deja
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I don't

have any experience of the Suzuki but the 140 has a lot of happy owners.

I also don't think the comparison between a 140 or a 225 is realistic but I guess that's what is on offer. If that's the case then it's a shame because the 150 Opti is a superb engine, it's also frugal. The 225 Opti is not proportionatly frugal, I found them thirsty at WOT about 65% more than the 150 and they used a lot more oil!

Apart from that they are a great motor
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Old 18 January 2007, 19:43   #33
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Country: Ireland
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Boat name: rockhopper
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Originally Posted by Cypman View Post
The Suzuki DF140 will give you plenty of fun on your 6.5m RIB. I get just under 40kts at WOT (6100rpm) with a Suzuki 20in pitch S/S propeller. The engine is very quiet and I normally burn circa 15 ltrs per hour operating around the 4500-5500 rpm band. So overall it is a great engine, just lacking the extra punch of its bigger block brothers.
Hi there, thanks for info. Out of interest, what sped is your boat doing with 20 " prop at 5000 RPM?

Aidan
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Old 19 January 2007, 04:20   #34
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Hi Aidan

At 5000rpm I am doing about 30kts, 34 kts @ 5500rpm.
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Old 20 January 2007, 19:05   #35
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Country: Ireland
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Hi Aidan

At 5000rpm I am doing about 30kts, 34 kts @ 5500rpm.
Hi Cypman, that would do me for the moment if i thought I would get it up wind and down wind with a few on board.

THe Gentleman owner says that it will do 35kts which bears up with what you say, i figured it may do more but perhaps with too much messing with props.

I will buy it anyway, I am sure as I recall 35 kts is fine.

I would be concerned with the 140 only forking out 125 Hp at Prop and thus may have to consider upgrading engine.
Not to worry, there are worse things!!!
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