prop/gear ratio issue

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scottydog78

Cadet
Joined
Jun 6, 2012
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9
Hi,

I've recently purchased a used Seaswirl 175 which was in need of substantial repair. We've had the engine changed (Volvo Penta 3L I/O) though the boat won't get enough speed to plane. The engine seems fine so we're assuming it is either the gearbox or (less likely) the propellor pitch. Does anyone know what gearbox ratio this boat should have? And also the standard propellor size too? Currently ratio is 1.97 with 17" prop - might this be the problem?

Many thanks!
 

Philster

Captain
Joined
Sep 15, 2009
Messages
3,342
Re: prop/gear ratio issue

Well... that engine with that gear ratio should spin that prop and the boat should plane just fine.

How old is the boat?

Is the prop in good shape?
 

QC

Supreme Mariner
Joined
Mar 22, 2005
Messages
22,783
Re: prop/gear ratio issue

Funny, I went to soaked foam . . . :) lol

He's got three threads going on this one. Going to start with the one in the Volvo I/O section and we'll go from there. Too confusing to have three threads on the same issue. Closing and may merge depending on how it plays out.
 
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