Let’s just say that the CXO300 engine produced by the English company COX Powertrain founded in 2007, by the motor racing engineer David Cox, is a revolutionary outboard motor and already before being marketed, it was awarded the prize by the ADI (Industrial Design Association) ) among the best design products for the year 2018.
It is fully fueled by diesel and has enormous maximum torque even at low speeds with very low fuel consumption.
It is the world’s first diesel outboard capable of delivering 300 horsepower to the propeller shaft at around 4,000 rpm.
In addition, the engine has low vibration, exceptional acceleration for gliding with reduced times and super smooth performance, with limited operating noise, but weighing more than that of a petrol equivalent.
The CXO300 is a diesel outboard engine designed immediately for marine use from scratch. Cox’s team of engineers, led by Stephen Moore in collaboration with the famous British engineering specialist Harry Ricardo, who practically worked with everyone from McLaren Cars to Bugatti, spent over a decade developing and perfect the engine. With months of final tests both in the water and in the laboratory before production, which began in the fall of this year 2019 and will also be the highest power density outboard ever created for a maritime application.
Made with a brand new 60-degree aluminum-alloy head block to save space, it is a 4.4-liter four-stroke V8, the most interesting thing is that this engine develops a maximum torque of 479 foot pounds (ft. Ibs ) corresponding to 649.437 Newtons per meter (Nm) already between 1,300 and 3,000 rpm and the manufacturer Cox claims that it is almost twice the torsion power of its 300 hp petrol rivals.
It is powered by a common rail high-pressure fuel injection system with two turbochargers that make the engine develop an impressive 300 bhp at the propeller with the crankshaft peaks at 338 bhp, truly exceptional performance.
Among the main features is its ordinary maintenance, in fact the CXO300 has been designed for maintenance plans spaced between them, with all the oil changes and replacement of the possible filters, which can reach up to 1,000 and 1,200 hours so initially this is the autonomy time with the engine in the water, thus reducing the need to pull the engine out of the water every 100 hours, as is usually the case with the current petrol outboards. In addition, a post-sales assistance service is available that allows the cancellation of the boat stop in the event of a fault, thanks to the ability to immediately offer a spare engine through a worldwide assistance network supported by 35 marine diesel specialists.
The savings for estimated maintenance costs are around $ 195,000 thanks to fuel savings, lower maintenance requirements and a life expectancy three times longer. This is because the block has been mounted vertically so that the energy is delivered directly along a steel shaft to a universal joint that brings energy to the propeller shaft. The gearbox was over-constructed to cope with the torque and increase its durability. Consequently, it is claimed that it has a life expectancy up to three times higher than a petrol engine and is at least 25% more efficient in terms of fuel consumption.
Despite the great effort to contain the weight and the dimensions, the CXO 300 is not only the most powerful outboard diesel engine in production but also the heaviest in the class of power of belonging due to the engine block that must necessarily be built more consistent to support the high compression ratio characteristic of the diesel engine is why the CXO300 weighs about 375 kg, more than 100 kg more than the average of equal petrol powers such as Verado 300R Mercury.
The cost of the CXO300 is around $ 54,000, including about 20,000 dollars more than a petrol outboard of equal power, so we find ourselves in front of an outboard that is heavier and initially more expensive but also more efficient and should last longer compared to a petrol outboard. These are the factors that most attracted attention among end users and operators in the sector.
However, Cox is hopeful that over the life of the engine, savings from fuel and maintenance requirements will offset the initial cost.
The steering and throttle controls are all provided by Sestar Solutions, including the ability to mount a joystick control for dual engine applications.
The engine is contained in a sturdy and lightweight carbon fiber grille available in white or black with a modern clean fresh design created specifically by industry specialists to house all the elements that make up the CXO300.