JCB Invests $68.5 Million Developing Six-Cylinder Dieselmax 672 Engine

With just eight years experience building four-cylinder diesels, JCB branches out to add the Dieselmax 672 six-cylinder for excavator power

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JCB spent $68.5 million to design and build its first six-cylinder diesel engine -- the Dieselmax 672 in four ratings up to 302 hp -- based on the 4.8-liter Dieselmax. It's less than ten years since JCB started building its own engines with its four-cylinder entry. 

There's a high degree of parts commonality with the four-cylinder Dieselmax; electronic control, Delphi common rail fuel injection and fixed-geometry turbocharging.

The six-cylinder engine will be offered with ratings of 188, 221, 255 and with a maximum output of 302 hp. Maximum torque is 885 lb.-ft.

JCB promises up to 8 percent improved fuel efficiency for the Dieselmax 672 compared to previous engines in the JS excavator line. In testing, the 7.2-liter engine has recorded a specific fuel consumption of just 189g/kWh while delivering excellent performance and rapid response.

The six-cylinder engines will be built on a dedicated line at JCB Power Systems’ Derbyshire, UK, facility. In development for more than two years, the engines have already completed more than 50,000 hours of testing, 30,000 of which have been in machines working in the field.

The Dieselmax engines have 500-hour service intervals, maintaining low operating costs and maximum uptime for customers. The engines will also be offered as part of the company’s OEM product line, for use in non-JCB machinery.

In 2006, two four-cylinder Dieselmax engines successfully powered JCB’s record-breaking Dieselmax car to a world land speed record of 350mph on the Salt Flats of Bonneville, USA. The engineering expertise involved in that successful record attempt has been invested in the development of this latest highly efficient addition to the JCB engine family.

Video: JCB Introduces a 6-Cylinder Diesel