Diesel Outboard

The video above is from the December 2018 New Orleans International Work Boat Show

MarineLink reports that Cox has announced that they have begun shipping production models of their 300HP diesel outboard motor.

The Coast Guard had a hand in developing this diesel outboard, noted here Feb. 2017.

“The US Coast Guard has entered into a Cooperative Research and Development Agreement (CRADA) with British diesel engine innovator, Cox Powertrain. The CRADA will evaluate and test the advantages, disadvantages, required technology enhancements, performance, costs and other issues associated with diesel outboard engine technology.”

Quoted here from a Marine Log report in November, 2018:

“Delivering 300 horsepower at the propeller, the CXO300 is the world’s highest power density diesel outboard engine. The four stroke V8 diesel CXO300 offers up to 25% more range compared to gasoline outboards and is designed to last up to three times longer. The engine combines the simplicity and economy of an outboard installation with greatly improved safety and reliability achieved by eliminating the need for highly volatile gasoline.”

3 thoughts on “Diesel Outboard

  1. My first thought in seeing these outboards is that they were HUGE! It turns out that they are. Here are some common outboards and their weights: 4.6-liter Mercury V8 FourStroke – 538 lbs. Yamaha’s F300 Offshore V6 – 562 lbs. Suzuki DF300A – 639 lbs. The Cox tops them all significantly, with a weight of 826 pounds. For comparison to today’s USCG outboards, the Yamaha 250 weighs in at 555 lbs.

    Most of the reviews that I read were favorable though. The longer range and single source of fuel were the two most positive features. Cox claims that it should last longer and be more durable. With a cost of $50,000 per engine, that is significantly higher than most existing gas outboards available today. It is targeted for military and government sales so the consumer market would not be an issue.

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