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Old 08 May 2001, 04:12   #1
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Country: Ireland
Town: Kinsale
Boat name: Tsunami/Saol Eile
Make: Excalibur Ribs
Length: 9m +
Engine: 350hp Volvo Diesel
Join Date: Apr 2001
Posts: 99
Mercury Optimax

Does anyone have any knowledge of fuel efficiency for an Optimax 200hp.
I fitted a fuel flow meter to my rib at the weekend. My boat is fitted with a 225hp Suzuki. I did a run out to the Mizen and the Fastnet Rock at the weekend and got a shock to see the fuel consumption rates! Cruising at 4000 rpm(33 Knots) the engine was burning 10.5 gph. At full throttle 5300 rpm it was burning 21 gph.
I would really appreciate it if somebody anybody has any information on the Optimax and Ficht engines for this sort of horsepower.

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Joe
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Old 08 May 2001, 09:52   #2
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Country: Ireland
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Make: Excalibur Ribs
Length: 9m +
Engine: 350hp Volvo Diesel
Join Date: Apr 2001
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Cheers Alan,
look forward to hearing what figures you get with your new engine.
Yes, possibly a bad idea to fit the flow meter, I was thinking it might be a good idea to take it out and fit an hour meter instead!!!

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Joe
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Old 08 May 2001, 19:06   #3
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Country: Canada
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And thats why I never fitted a fuel flow meter to our Johnson 150 VRO!! Didn't want to know how much it burned ... way too frightening!

All being well I will be able to shortly give you some feedback on a 150 Optimax as we are fitting one to replace our blown engine. Dealer literature says 40% more efficient but we'll see!

Alan
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Old 27 May 2002, 10:19   #4
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Country: UK - England
Town: St Mawes
Boat name: Magellan Zulu
Make: Ribcraft
Length: 7m +
Engine: 2 x Suzuki DF150
MMSI: 235094135
Join Date: Dec 2001
Posts: 483
I searched for "flow meters" on RIB talk and this is the only thread I found. I'm keen to get one but have no knowledge nor info. Any leads gratefully received.

Cheers...
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Old 27 May 2002, 10:48   #5
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Mike see PM ref. Floscan
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Old 27 May 2002, 11:48   #6
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Country: UK - England
Town: St Mawes
Boat name: Magellan Zulu
Make: Ribcraft
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MMSI: 235094135
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Thanks, Alan.
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Old 27 May 2002, 14:02   #7
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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
Join Date: Jan 2002
Posts: 311
I have a Yamaha 200Hpdi on a 7.2m Rib with a Yamaha Fuel computer fitted on the console. Flat out its shows about 18 gph (46knots) Cruising at about 25knots it gives a reading of 7-8 gph. I have found that if anything it slightly over-reads.
Hope that this give you some help.
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Old 27 May 2002, 15:52   #8
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Country: UK - England
Town: London
Make: Humber Ocean Extreme
Length: 8m
Engine: Optimax 225
Join Date: Aug 2001
Posts: 313
I have been told that my Optimax will do 10gph at around 30kts;if the smart stuff on the dials works it is there orthere abouts;@35 /40kts have seen the figure16 displayed so changed the mode!
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Old 27 May 2002, 16:17   #9
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Country: UK - England
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Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
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Sorry joe , thats why i am going for a diesel.

Estimates 5.5 GPH at 2600RPM (75% WOT) and 11GPH at WOT.
Oh forgot to add I will be paying 90P per gallon.



Thats when I get it

Only rubbing a bit of sea salt into the fuel bill wounds.

Regards
Gary
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Old 27 May 2002, 20:19   #10
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Country: UK - England
Town: Iver, Bucks, UK
Boat name: Prime Rib II
Make: Humber Ocean Pro
Length: 6m +
Engine: Mercruiser 1.7 diese
MMSI: 235086032
Join Date: Jul 2001
Posts: 443
The Mercruiser 120hp is only suposed to use 2 - 2 gallons per hour at cruising speeds, (25 knots ish). I'll let you know if it's true come mid July when my boat will be ready, (hopefully)

Boatless!
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