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On 16 Aug 2003 14:33:28 -0700, (NLC) wrote:

is it ok to replace a 120 hp engine with a 220 and keep the same
outdrive, just changing the prop, or would I have to get a different
outdrive for the higher hp? What is the difference between a outdrive
that comes with a 120 hp engine as opposed to a drive that comes with
a 220?

Thanks
NLC

Assuming you're talking Mercruiser - they all use similar bits - but
the 120 HP used a crown gear pair in the upper outer unit to provide
an overall ratio of 1:1.98
whereas the high horse versions used a gear ratio of 1:1.5

The gear pair can be ~$200. Then you need to find a prop for the boat
speed and top revs.

Brian Whatcott