The powerful COX 300
A new Cox 300 horsepower diesel outboard completed its first sea trial.
It is described as the most powerful production diesel outboard ever built.
The 4.4-litre V8 engine uses twin turbos and common-rail injection. It delivers 300 horsepower and 650 Newton metres of torque.
Designed and built in Britain, it targets efficiency and high performance.
Testing showed smooth operation, especially at cruising speed.
It was compared with a 350 horsepower petrol V8 with similar refinement.
The diesel is slightly noisier at idle but improves at speed. Target weight is 350 kilograms with aluminium construction.
Expected top speed reaches up to 40 knots with final propeller tuning.
This video was published on the Motor Boat & Yachting YouTube channel.
I gave COX some visibility here.
Specs
| Model | COX 300 |
| Power output | 300 hp (224 kW) |
| Emissions certifications | EPA 3, IMO II, RCD II, BSO-II |
| Maximum rpm | 4.000 |
| Displacement | 4,4 l (266 cu.in) |
| Dry weight | 393 kg (866 lbs) |
| Aspiration | Twin-turbo |
| Gear ratio | 1.46:1 |
| Shaft lengths | 25″, 30″ & 35″ |
