Yamaha V8 XTO Offshore: 425 HP to break all the boundaries

Yamaha V8 XTO Offshore displaces 5.6 liters and develops 425 horse power. It’s a new benchmark for leisure outboards, and another step in the outboards’ race for power.

More than an outboard” is the first claim of the Japanese manufacturer when introducing the new Yamaha V8 XTO Offshore. A brand new engine (the previous V8 F350 displaced 5.3 liters), with several innovations for the world of outboards, including direct injection and electric power steering.

Extreme performance

In designing this new engine, Yamaha has “rethought” the concept of outboard and related gear, applying innovative technologies and, of course, taking advantage of many years of experience in  outboards’ design.
So the Yamaha V8 XTO Offshore is the only four-stroke outboard engine to use high pressure direct injection directly into the combustion chamber, a solution that improves the fuel pulverization and increases the effectiveness of combustion for maximum power and efficiency. This injection system, with a pressure that can reach 200 bar, works at three different steps, with two independent fuel pumps that are activated at different engine rpm ranges.

The cylinders of Yamaha
V8 XTO Offshore are made
with a plasma casting for
greater durability and
thinner metal construction

In addition, the vapor separation system (VST) ensures extreme precision of the flow and of fuel supply, even at maximum rpm. The compression ratio is 12.2: 1, while the In-Bank exhaust provides a direct outbound stream through the propeller hub, improving the flow.
The water pump can also work on two steps, while the oil pump has a double chamber. The first is equipped with a large rubber impeller in an ultra-strong case to ensure a large flow of cooling water and accurate temperature control at all rpm levels, even in the most extreme conditions of use.

The cylinders of Yamaha V8 XTO Offshore are made with a plasma casting for greater durability and thinner metal construction. The surface micro-texture is 60% more resistant than steel, and also lighter; the lower grip also optimizes fuel economy. The engine works with a double overhead camshaft for each bank where the shafts are moved by a pretensioned chain immersed in an oil bath, for a more precise timing. To prolong the life of the valves they are coated with carbon, thus ensuring silent and precise operation.

Another innovation of the new Yamaha V8 XTO Offshore is the fully integrated electronic steer control, which does not require hydraulic connections, or cables, or levers of any kind, in order to respond faster and more fluidly than conventional systems. The control system is designed to be coupled with Yamaha Helmmaster, which features a joystick for maneuvering and anchoring and the CL7 color display. Propellers are new as well: XTO OS screws, designed to implement the generous torque of the new engine: their diameter range from 16 to 17⅛ inches.
The wider surface of the blades ensures a greater thrust and, thanks to the aforementioned exhaust system, the reverse push (when going back…) is up to three times higher than that of Yamaha F350. This should make maneuvering and mooring easier. Finally, an oil change with Yamaha V8 XTO Offshore can be made while docking, through the engine shaft. Last but not least, a pretty high recharge capacity is ensured by the alternator up to 90 A.

So, the wait is almost over: during the summer Yamaha will roll out the new unit in different events and boat shows, in two liveries: the well known Yamaha Gray and a new pearlescent white.

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