A wise man once said,There is no substitute for displacement, except for more displacement. That's right. Even though a lot has changed in the age of electronic engine management, cylinder capacity is still an important factor for all engine manufacturers. Especially when it comes to torque.
Yamaha is taking the safe route in this respect and equipping its new V8 XTO Offshore with a 5.6-litre block. This makes it the largest of the series-produced four-stroke outboards.
The same applies to the performance described by the manufacturer as425 HP is specified. Other unique selling points are the extremely high compression ratio of 12.2:1 and the direct injection of the eight-cylinder engine.The innovative injection system works with five fuel pumps that generate a maximum injection pressure of 200 bar. The fuel is injected directly into the combustion chamber at high pressure. This improves the atomisation of the fuel and increases effectiveness, performance and efficiency.
The valve control is also a technical highlight with four-valve technology, four overhead camshafts, a timing chain that moves in an oil bath and is automatically tensioned, and low-noise carbon tappets. If you want to effortlessly move propellers with a diameter of 16 to 17 ¼ inches and heavy boats, you need a solid engine mount and an extremely robust gearbox with specially hardened gears.Yamaha's V8 XTO Offshore has both.
To optimise the conversion of power and torque into thrust, the Yamaha technicians haveCompletely new propellers whose wing design, in combination with the modified exhaust system, generates three times as much thrust in reverse as the in-house F350. A big plus when manoeuvring in the harbour.
The best for last: The V8 XTO Offshore is the first outboard worldwide to be equipped with an electric control system. Hydraulic lines and cylinders are a thing of the past. Combined with Yamaha's Helmmaster boat control system, i.e. with joystick and colour display, the operating comfort is in the five-star segment.
Conclusion: With the displacement giant V8 XTO Offshore, Yamaha Marine has advanced to the top of its class in terms of innovation, technology, performance and design.
Info: www.yamaha-motor.eu
