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Author Topic:   REVENGE 20: Minimum Engine

Tonio posted 08-21-2007 04:42 AM ET (US)
Hello to all,
I am pretty new here, as I am just on the point to buy a 1987 Revenge 20 here in Europe.
The boat is now powered with a nice 2005 Mercury Optimax 150. To try to save even more gas, I was wondering if I could exchange the 150 HP to a lower horsepower, like a 115 E-TEC for example. Would I save gas then compared to the 150 Optimax ? Or would the lack of torque of the 115 force me to run at higher RPM, and then not save anything ?
Thanks in advance for your help !
Antoine
HAPPYJIM posted 08-21-2007 06:48 AM ET (US)
Max HP is 200HP. Minimum is 90HP. I guess it would depend on your use. If you go slow all the time, I would think you would be OK.
Peter posted 08-21-2007 08:32 AM ET (US)
Although it will plane with 90 HP and a light load, a 150 HP motor is the minimum HP for a 20 Revenge to make it useable as intended. You will not save enough gas, if any, moving from a 150 Optimax to a 115 E-TEC, or any other fuel efficient 115 HP equivalent, to make the change economically worthwhile.
To go the same speed, whether pushed by a 150 or a 115, requires the same amount of work and both motors are about as efficient as a motor can be at delivering the power to provide that work. The difference is that that 115 will have to spin faster to deliver the power and will not be as able to carry heavier loads when that is required from time to time.
Save your money and stay with the Optimax 150 that is currently on the boat.
jimh posted 08-21-2007 08:48 AM ET (US)
On a REVENGE 20 a single 150-HP motor is a good set up. Your fuel economy will depend on how fast you go. A good planing speed on that boat will be around 24-MPH. It takes the same horsepower to reach that speed no matter what the engine's maximum horsepower, and I do not think you will see much difference in fuel consumption between running a 150-HP or a 100-HP--they both will have to produce the same power to maintain plane.
Considering the expense of re-powering, it would take a long time to recover that cost in fuel savings, even if there were some fuel savings to be had from a new engine. However, I think the potential for fuel saving is very limited, as the OptiMax is already an efficient and modern two-stroke direct injection motor.
Tonio posted 08-21-2007 09:48 AM ET (US)
All clear !
Thank you very much to all of you !
Antoine

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Author	Topic: REVENGE 20: Minimum Engine
Tonio	posted 08-21-2007 04:42 AM ET (US) Hello to all, I am pretty new here, as I am just on the point to buy a 1987 Revenge 20 here in Europe. The boat is now powered with a nice 2005 Mercury Optimax 150. To try to save even more gas, I was wondering if I could exchange the 150 HP to a lower horsepower, like a 115 E-TEC for example. Would I save gas then compared to the 150 Optimax ? Or would the lack of torque of the 115 force me to run at higher RPM, and then not save anything ? Thanks in advance for your help ! Antoine
HAPPYJIM	posted 08-21-2007 06:48 AM ET (US) Max HP is 200HP. Minimum is 90HP. I guess it would depend on your use. If you go slow all the time, I would think you would be OK.
Peter	posted 08-21-2007 08:32 AM ET (US) Although it will plane with 90 HP and a light load, a 150 HP motor is the minimum HP for a 20 Revenge to make it useable as intended. You will not save enough gas, if any, moving from a 150 Optimax to a 115 E-TEC, or any other fuel efficient 115 HP equivalent, to make the change economically worthwhile. To go the same speed, whether pushed by a 150 or a 115, requires the same amount of work and both motors are about as efficient as a motor can be at delivering the power to provide that work. The difference is that that 115 will have to spin faster to deliver the power and will not be as able to carry heavier loads when that is required from time to time. Save your money and stay with the Optimax 150 that is currently on the boat.
jimh	posted 08-21-2007 08:48 AM ET (US) On a REVENGE 20 a single 150-HP motor is a good set up. Your fuel economy will depend on how fast you go. A good planing speed on that boat will be around 24-MPH. It takes the same horsepower to reach that speed no matter what the engine's maximum horsepower, and I do not think you will see much difference in fuel consumption between running a 150-HP or a 100-HP--they both will have to produce the same power to maintain plane. Considering the expense of re-powering, it would take a long time to recover that cost in fuel savings, even if there were some fuel savings to be had from a new engine. However, I think the potential for fuel saving is very limited, as the OptiMax is already an efficient and modern two-stroke direct injection motor.
Tonio	posted 08-21-2007 09:48 AM ET (US) All clear ! Thank you very much to all of you ! Antoine