On Wed, 23 Apr 2008 02:51:11 -0700 (PDT), Jay
wrote:

Often, one will see two outboard motors with the same rated horsepower
yet one may have 25% greater engine displacement (i.e. 68cc vs. 85cc)
yet both will be rated 2.5 hp.

(1) How does the smaller displacement motor achieve the same
horsepower rating as the one with a greater displacement?

(2) What's the bottom line advantage, if any, to the outboard that has
the same horsepower rating yet has a greater cc displacement?

....
-Jay


ANSWERS:

(1)
Runs faster,
has 2 stroke versus 4-stroke design
Has higher compression.
More effective piston ring sealing.
More radical publicity department
More ball races - for piston rod and crank.
Uses more gas (specific fuel consumption poorer)
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(2)

Lasts longer, though heavier
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You're welcome

Brian Whatcott
Altus OK