It is really fom the prop. You would be turning a lot bigger pitch prop
than stock which will pull on the boat more than the hull can support.

--
Tony
my boats and cars at http://t.thomas.home.mchsi.com
"trainfan1" wrote in message
...
tony thomas wrote:

Be carefull w/ putting a lot of hp into a boat that was not designed for
it.
I/O type boats - if overpowered - will run sideways due to the torque of
the engine. The boat is just not designed hull wise for a big hp/torque
power plant.
They come w/ V8 but at about 250 hp or so. If you put 400+ hp in it you
may find that it does not run straight.


On a typical I/O single(Mercruiser, Volvo SX, Cobra), facing the stern
from outside the boat, the engine is turning ccw, and the prop(single,
again) is turning cw... so I really don't understand your statement - is
it torque from the prop or from the engine? If it's the engine, what is
the moment?

Rob