Last week, the JCB Dieselmax broke the diesel FIA international land speed record at the Bonneville Salt Flats with two runs averaging 317 mph. This week the Dieselmax upped the ante by breaking its own land speed record at 328.767 mph, then broke that record with a speed of 350 mph on Wednesday, setting three diesel speed records in six days.

The Dieselmax is powered by two JCB444-LSR engines constructed by Ricardo engineers. The engines use the Ricardo High Speed Diesel Race (HSDR) combustion system, originally developed for competitive racing.

The JCB Dieselmax features many technologies Ricardo is developing to make high-performance, ultra-low emissions diesel vehicles more energy-efficient and less polluting. These include diesel particulate filters, two-stage inter-cooled turbo-charging, high-pressure fuel injection, and a low-compression-ratio low-temperature combustion system.