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Old 22 March 2012, 17:34   #1
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Ocean Pro 6.3 with Optimax 150 or Suzuki 140?

Hi,

I am thinking of upgrading my boat to an Ocean Pro 6.3 and having searched the internet I have found various options available. I see that there are some Ocean Pro's available with the Mariner Optimax 150, and was wondering in this day an age why people would still be fitting new 2 stroke engines as opposed to 4 Strokes. I know that Humber boats normally are fitted with Suzuki's as that is what I have myself. I am much more likely to go with another Suzuki maybe a 140 or 150 on an Ocean Pro 6.3, as the current Suzuki is a brilliant engine IMO. Anyone know why people would use the 2 stroke option?

Cheers!
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Old 22 March 2012, 17:48   #2
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Why not?
Optis are noisy at idle, but if you can put up with that, then they do the job very well.
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Old 22 March 2012, 17:53   #3
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How about the new Mercury F150 Four stroke its cheaper than the Suzuki!.
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Old 22 March 2012, 18:32   #4
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More responsive, far quicker for the power and weight, plus the sound is awesome. Far better for skiing and more fun to play. Cheaper (????) and unless you do many hours per year, the litres per mile isn't much different with new efficient 2 strokes.

6.3 ribquest with 140 suz used 60 to do 80 mile round Anglesey. Our ocean pro 6.3 opti 175 was 75. Unless you're cruising long distances a lot, the 4 strike isn't worth the cost, weight, throttle response or lack of power.
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Old 22 March 2012, 18:58   #5
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Paul,

That is the kind of information I was after! I will be doing no more than about 30-40 hours on the engine per year. Normal trip lengths for a day out are around 30-35 miles, and an occasional trip to the Isle of Man maybe once per year will round about 120 miles. You mention weight above, is there much difference between a 140 Suz and say a 150 opti. The only experience I have with 2 strokes is a Mariner 225 which I thought was very noisy when idling. Can you let me know how your 175 is regarding noise, litres per mile average and oil consumption?
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Old 23 March 2012, 04:21   #6
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Suzuki df 140 38 kts
Optimax 135 42 kts
Same Rib!
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Old 23 March 2012, 07:52   #7
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Quote:
Originally Posted by Kernow View Post
Suzuki df 140 38 kts
Optimax 135 42 kts
Same Rib!
Opti 135/150/175 2.5L V6 195kg
(Opti 75/90/115/125 1.5L 3cyl 170kg)
Suz 100/115/140 186 kg

On a 6.3 ours is about 1.2L per mile at cruising. Tony T on here gets about 0.9L per mile.

He loves his, he cruises a lot though! We do 2 cruises (50-80m) a year, then fish, wakeboard and play about. The torque and throttle response of the 2 stroke is far superior for that type of activity. It's horses for courses.

Doing 50hrs per year, oil us in neglible. Noise wise, at idle it is fine when we troll fish, but the suz is v quiet, though no more than the 125 opti, perhaps a fairer comparison. Though on a 6.3 this may not have the torque needed as it is a 1.5L.

At speed, after a lurrrvly V growl as you power through the mid range, it settles to a hum which you hardly notice due to wind. Just like V6 cars, great noise when you accelerate, but quiet at a constant speed.
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Old 23 March 2012, 08:08   #8
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I'd have a 125 Opti before a DF140.
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Old 23 March 2012, 08:19   #9
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Quote:
Originally Posted by Downhilldai View Post
I'd have a 125 Opti before a DF140.
I'd agree, but on a 6.3m hull, will a 1.5L have enough torque..

DF 140 138 HP at 6000 RPM, max torque of 122 ft-lbs at 4500 RPM.
Can't find the figure for the opti??
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Old 23 March 2012, 11:27   #10
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Paul,

Cheers for the feedback, I know where there is a boat with a 150 opti on the back and I will try and get a look at it, you've broadened my mind!
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