F375 XTO. The ‘son’ of the Yamaha V8 XTO
F375 XTO, this is the name of the youngest member of the Yamaha outboard family. Only a few months ago, we saw the presentation of the 425 hp (312.5 kW) Yamaha V8 XTO, that rapidly set a new level of standards and received a lot of attention.
Now the marine division can proudly announce another important launch: the new 5.6-liter V8 F375 XTO model, with 375 hp (275.7 kW). This new model shares the same technology as the 312.5 kW Yamaha V8 XTO as, for example, the direct injection fuel delivery system and the fully integrated electric steering system.
The key words from Yamaha for this new engine and its ‘twin’ are: power, torque and extreme thrust. The strength required to “push” the heaviest offshore vessels and large luxury vessels must be supported by very resistant gearboxes and an incredibly robust engine capable of activating large propellers together.
This is why Yamaha new XTO engines are the first 4-stroke engines in the industry to use direct injection. The high pressure injection directly into the combustion chamber greatly improves the atomization of the fuel and optimizes its use.
The F375 XTO does not lack features
The direct injection system has five fuel pumps and generates an injection pressure of up to 200 bar. The three-stage fuel pressure system also includes two independent fuel pumps that are activated at specific rpm levels. This ensures a steady fuel flow and delivery, even at maximum rpm levels. The compression ratio is 12.2: 1.
The F375 XTO features a unique two-stage water pump and a double chamber oil pump. Each designed for constant and reliable operation, suitable for a high number of revolutions.
In addition to an oversized gearbox, reinforced gears, a sturdy mounting plate and strong engine mountings, the F375 XTO features a plasma casting technology for the cylinder liners for an increased duration. The micro-structure of the surface is 60% more resistant than steel and much lighter. This allows to improve the capacity of the engine without increasing its size. Lower surface friction also helps optimize fuel economy.
The new engine is more than ready to ‘navigate’
The idea is to combine the F375 XTO engine with Yamaha’s fully integrated Helm Master control system designed for the latest generation of vessels. The Helm Master includes revolutionary joystick controlled functions and a CL7 display.
The new XTO OS special propellers are made to enhance the enormous torque of this engine. These propellers produce more thrust in both forward and reverse, with diameters between 16 and 17⅛ inches (between about 0.4 and 0.44 m).
Thanks to the new exhaust gas vent system, these propellers have an additional advantage. They “bite” clean water in reverse, for a thrust three times higher than the one developed by Yamaha F350. This leads to better maneuverability and greater control during the mooring.
The F375 XTO also has high electrical charging capacity, providing up to 90 Amps of power (gross). The new engine will be available on the market starting autumn 2019, and it will be available in the classic Yamaha gray.