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  225 optimax on a 255 conquest?

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Author Topic:   225 optimax on a 255 conquest?
Dennis Walberg posted 06-15-2004 02:20 PM ET (US)   Profile for Dennis Walberg   Send Email to Dennis Walberg  
I am planning a sea trial on a 2002 255 Conquest. I am concerned that the Whaler may be under powered - being slow to plane. I am very pleased with my present 1999 21' Conquest powered by a 200 optimax. Again the 25' Conquest is powered by the 225 optimax. Your thoughts will be appreciated.
Backlash posted 06-16-2004 07:45 AM ET (US)     Profile for Backlash  Send Email to Backlash     

The minimum horsepower recommended for the 255 Conquest is 225, maximum is 400. This is a 4900# boat. When a boat is powered by the minimum recommended HP I equate that to minimum performance. This boat should have twins.


rtk posted 06-16-2004 10:53 AM ET (US)     Profile for rtk  Send Email to rtk     
Denny, has performance tests on the site for the new models.

They do have a performance graph showing their results with the 225 Opti on the 255 Conquest.

Hope this helps.


bbrunner posted 06-16-2004 01:08 PM ET (US)     Profile for bbrunner  Send Email to bbrunner     
I have the same configuration as tested on the 255 Conquest, but it is a 1999 23 Conquest. I have a 1999 225 Optimax with a 15p Mirage prop. I WOT at 5200 RPMS and see a top speed of 41mph.

I am happy with this performance on my boat, but I would think the performance on a 255 would be worse.

seasicknes posted 06-16-2004 01:24 PM ET (US)     Profile for seasicknes    
Go twins !
bsmotril posted 06-16-2004 07:01 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I think the most telling factor that the boat is underpowered with a single 225 is that it does not start to plane until it hist 4000-4500 rpm. Running at a cruise of 4500 rpm is going to suck down gas, not to mention shortening the live span of the motor by running it a lot in the upper RPM ranges just to maintain cruising speed. A good pair of twins with the surface area of two props helping to carry the weight of the boat will let you get planing/cruising rpms down to 2800-3000 where the motors will run a lot more economically. Especially an Opti with its' low rpm stratified charge mode of operation. Bill
TRAFFICLAWYER posted 06-16-2004 09:48 PM ET (US)     Profile for TRAFFICLAWYER    
Single on a 255 is a bit underpowered, I have twin 200 hp HDI's on my 255 03. Your going to be pushing almost 8000+-
lbs. On mine, Thats 5500,+ 1000 motors, + 1000 fuel and water, + 500 gear than add people.I plane virtually with a push of the throttles and can hit 48-50 trimmed up and light on liquids.

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