randyo3629
Well-known member
been looking at new Tohatsu 15 & 20 hp tiller outboards. the brochure shows the internal engine specs to be identical... as in displacement. the gear ratio is the same. prop selection size is the same @ 6"-11.5"
the only difference is see is in the Max RPM range. 5000-6000 on the 15 hp and 5400-6100 on the 20 hp.
how could the additional 100 RPM make 5 hp difference?
what do they do to get the extra 5 hp?
seems to me that with the engines being basically identical, you make up for a difference in top speed with change in propeller pitch.
i also looked at the specs for their 8 & 9.8 hps motors....they are identical in every way.
this will be my first new engine. do you get to pick the pitch of the propeller? why the large range in prop sizes?
all else being equal, is it worth the extra $$ for 5 hp?
thanks.
the only difference is see is in the Max RPM range. 5000-6000 on the 15 hp and 5400-6100 on the 20 hp.
how could the additional 100 RPM make 5 hp difference?
what do they do to get the extra 5 hp?
seems to me that with the engines being basically identical, you make up for a difference in top speed with change in propeller pitch.
i also looked at the specs for their 8 & 9.8 hps motors....they are identical in every way.
this will be my first new engine. do you get to pick the pitch of the propeller? why the large range in prop sizes?
all else being equal, is it worth the extra $$ for 5 hp?
thanks.