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Old 16 March 2005, 18:57   #1
Country: UK - England
Town: suffolk
Boat name: (Relief) & Blob Mk4
Make: Avon/ILC & Avon
Length: 3m +
Engine: 40hp/10hp Mariner
Join Date: Nov 2004
Posts: 98
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Outboard Gearbox

Hi excuse me for being a total novice when it comes to Outboards. Is there anything you can do with a outboards gearbox to get more power from the Engine? I.e change the gear ratio to get more revs at the prop?

if so who does it or how is this done?

RNLI Lifeboat Crew, Landy & SIB fan...
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Old 18 March 2005, 03:58   #2
Country: UK - England
Town: Colne
Make: Driver 440
Length: 4m +
Engine: Outboard 70HP
Join Date: Mar 2005
Posts: 12
One does not need to do any changes to the gearbox at all to change RPM. By changing the pitch of your prop, this will alter your RPM at WOT. (Wide Open Throttle). As for power, nothing. An outboard delivers max. HP at manufacturers recommended maximum RPM. So, you need to know the max RPM of your outboard, and are you achieving this at WOT. If so, you are about there.

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Old 18 March 2005, 07:25   #3
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Sometimes it can help to change the gear ratios for certain apps - maybe you need to run special props for more thrust at low speeds whilst keeping the engine in the right powerband etc but generally speaking yes it is the prop that has to be played with.
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