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Cox Marine presents final concept of diesel outboard at Seawork International

The Cox CXO300 is the world’s first high-output diesel outboard.

The Cox CXO300 is the world’s first high-output diesel outboard.

After 10 years in development, the world’s first 300-hp diesel outboard, the Cox Powertrain CXO300 is on display this week at the Seawork International workboat show in Southampton, U.K.

The company says the engine that is in stand PY65 at the show is the final concept of the motor. Sea Trials of the CXO300 will start in October and orders will be taken starting in November with production beginning in the second quarter of 2019.

In a recent conversation for an article on large outboards for our sister publication, Anglers Journal, Michael Peters, president of Michael Peters Yacht Design said, “If anybody manages to do a lightweight diesel outboard of significant power, it will be a game-changer.”

Cox Marine says the engine offers a 25 percent better range compared to a gasoline outboard and is designed to last up to three times longer. It reportedly has 100 percent higher peak torque at the crankshaft than comparable 300-hp gas outboards and 65 percent higher than a 350-hp outboard.

The CXO300 is a V-8 with a displacement of 4.4 liters (266 cubic inches) and bore and stroke of 84mm (3.3 inches) x 98.5 mm (3.9 inches). It weighs 772 pounds (350 kg) and makes a peak torque of 479 foot-pounds. It’s available in 25-, 30 and 35-inch shaft lengths in two gear ratios, 1.23:1 and 1.46:1. 

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