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Old 25 July 2012, 17:54   #1
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175 Yamaha or 225 Verado?

I'm looking to spec a new 6.4 ribcraft and, as a relative novice, was looking for a little advice on engine choice. I have done a fair amount of research and it's now down to a straight shoot out between a Yamaha 175 or a Merc Verado 225. Is the 225 just too powerful for this length of rib and can anyone provide me with the relevant (rough) likely stats for each option re top end speed, acceleration and fuel economy for this length of rib? I know prop choice will come into the equation but I'm after a rough guide only. The rib will be mainly used for leisure. Thanks.
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Old 25 July 2012, 18:34   #2
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Verado!
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Old 25 July 2012, 18:37   #3
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well the 6.4 is not rated to 225hp so if you want insurance then you better get the 175hp. 225 IMO is waaaaaaaaaay OTT for that hull.

personally i'd get the new merc 150 but hey ho.

cheers
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Old 27 July 2012, 12:27   #4
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My hunch would be Verados. Have done lots with twin 300 Verados and they are awesome! As for size, I would have thought 225 would be fine on a ribcraft 6.5 but go gently as it will be swift!
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Old 27 July 2012, 13:45   #5
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engine choice is very personal so here is some data based on 150hp engines

From a test of 150 hp outboards in a swedish boat magazine:

Boat used: Flipper 605 WA (6,15 meter x 2,32 meter, total weight at test 1400 kilogram, water temp 18 deg. Celsius

Honda BF150
Top RPM in test: 6000
Prop used: Honda HR, 3 blade, 20 inch pitch

a) Speed (knots):
At max rpm: 41,7
Minus 500 rpm: 37,2
Minus 1000 rpm: 32,6
Minus 1500 rpm: 29,1
Minus 2000 rpm: 25,5

b) Fuel consumtion (litre per nautical miles):
At max rpm: 1,27
Minus 500 rpm: 1,03
Minus 1000 rpm: 0,91
Minus 1500 rpm: 0,80
Minus 2000 rpm: 0,75

c) Noise (decibel):
At max rpm: 86
Minus 500 rpm: 84
Minus 1000 rpm: 82
Minus 1500 rpm: 81
Minus 2000 rpm: 80

d) Acceleration (sek):
0-30 knots: 9,2
15-30 knots: 6,8

Mercury Verado 150
Top RPM in test: 6200
Prop used: Mirage, 3 blade, 17 inch pitch

a) Speed (knots):
At max rpm: 41,2
Minus 500 rpm: 36,5
Minus 1000 rpm: 33,4
Minus 1500 rpm: 29,5
Minus 2000 rpm: 25,6

b) Fuel consumtion (litre per nautical miles):
At max rpm: 1,80
Minus 500 rpm: 1,45
Minus 1000 rpm: 1,30
Minus 1500 rpm: 1,04
Minus 2000 rpm: 0,77

c) Noise (decibel):
At max rpm: 87
Minus 500 rpm: 86
Minus 1000 rpm: 83
Minus 1500 rpm: 82
Minus 2000 rpm: 80

d) Acceleration (sek):
0-30 knots: 7,3
15-30 knots: 5,4

Yamaha F150
Top RPM in test: 5600
Prop used: Yamaha Pro Series, 3 blade, 21 inch pitch

a) Speed (knots):
At max rpm: 44,3
Minus 500 rpm: 40,3
Minus 1000 rpm: 35,4
Minus 1500 rpm: 31,7
Minus 2000 rpm: 26,0

b) Fuel consumtion (litre per nautical miles):
At max rpm: 1,26
Minus 500 rpm: 1,10
Minus 1000 rpm: 0,95
Minus 1500 rpm: 0,84
Minus 2000 rpm: 0,78

c) Noise (decibel):
At max rpm: 87
Minus 500 rpm: 84
Minus 1000 rpm: 83
Minus 1500 rpm: 80
Minus 2000 rpm: 79

d) Acceleration (sek):
0-30 knots: 8,3
15-30 knots: 5,9

Fuel you would go with the Honda or Yam, acceleration with be the verado i.e. the verado burns 30% more fuel at full throttle compared to the Honda but accelerates 20% faster with nothing in it for top speed.

anyway the numbers above should give you some idea on which engine is best suited for what you want.

Dave
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Old 27 July 2012, 14:49   #6
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Quote:
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well the 6.4 is not rated to 225hp
It can be if you ask before it's built

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Originally Posted by dubrus View Post
225 IMO is waaaaaaaaaay OTT for that hull.

No it's not

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personally i'd get the new merc 150 but hey ho.
If going for a 150, I'd go Etec
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Old 30 July 2012, 14:17   #7
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Thanks everyone. Useful stats and info. For the record the 225 can definitely be spec'd on a 6.4 deep v. Most of the time the boat will be carrying a lot of people (6 plus) and will be used for long distance trips and recreation hence wanting to explore a bigger engine.
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Old 30 July 2012, 15:04   #8
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Originally Posted by ackcarter View Post
Thanks everyone. Useful stats and info. For the record the 225 can definitely be spec'd on a 6.4 deep v. Most of the time the boat will be carrying a lot of people (6 plus) and will be used for long distance trips and recreation hence wanting to explore a bigger engine.
Weight as well as Horse power is equaly Important,Especialy when your 'on the limits' and I think the Verado's (Although highly rated) are pretty lumpy, in comparrison to other options.Seems a Big discrepincey in the 'choice' between the Yam 150 and a Verado 225?..Nice Boat the 6.4
By the way got a Suzi 250 DF on my 6.8 RC and Love it!
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Old 30 July 2012, 15:37   #9
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if you go for as 175, you will only be wondering what the 225 would have been like!!!!!
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Old 30 July 2012, 16:13   #10
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The verados are beautiful machines with fly by wire etc

Is a lot for that length but if it's a heavy fit out , and transom can take the weight then it's down to the skip to manage the power, one problem you will definitely get if the boat isn't rigged to precision, is torque making the boat lean to the left and it won't fly off waves without leaning
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