Different cooling, different materials, different ECU programming. The engine is cooled by sea water, additionally so too is the exhaust manifold, which is not seen on automotive engines.
Stainless steel water transfer pipes are used instead of cheaper rubber or pressed steel for risk of corrosion.
The engines are typically designed to run at permanently high revs depending on the marine application.
Boat engines are built to hold high rpms (revolutions per minute) for long periods of time. Vehicle engines are not built for high rps or most of the anyways. Vehicle engines also have more torque the marine engine.
there is no difference
the kayak is a covered boat and the Umiak is an open boat
one is a boat and one is a pixie like thing
a steam boat is on the water and a train is on railroad tracks
One has sides and one does not
All tug boat engines are four stroke engines, because this engine responces quickly in relation to maneuvering this kind of boat in any situation.
Dick Hewitt has written: 'Boat engines' -- subject(s): Maintenance and repair, Motor-boat engines
Displacement: The weight of the water the boat displaces. Hull weight: The weight of the hull of the boat
Do not use auto power steering oil in a boat.
I would say 50 H.P.
"Cigar boat" is a nickname for the high-speed powerboat called the Cigarette boat.