JCB Hydromax: How Hydrogen Power Reached 406.320 MPH at Bonneville Salt Flats
The Bonneville Salt Flats has once again become the center of the land-speed racing world. This time, the headline is not simply about raw speed—it is about what hydrogen-powered technology can achieve.
In August 2026, British engineering company JCB brought its hydrogen-powered Hydromax streamliner to Utah's Bonneville Salt Flats and recorded an average speed of 406.320 mph (653.909 km/h). The Fédération Internationale de l’Automobile (FIA) confirmed the achievement as a provisional World Land Speed Record for a hydrogen internal-combustion-powered vehicle, subject to the formal ratification process.
The result placed the JCB Hydromax at the center of a much bigger question: can hydrogen combustion technology become a serious part of the future of high-performance engineering?
A Record-Breaking Return to Bonneville
The Hydromax project has a strong connection to JCB's previous record-breaking history.
Twenty years earlier, JCB brought its Dieselmax streamliner to the Bonneville Salt Flats. In 2006, the Dieselmax reached 350.092 mph, establishing a world diesel land-speed record. In 2026, JCB returned to the same legendary salt surface with a very different power source—hydrogen.
Behind the wheel of both projects was Wing Commander Andy Green OBE, one of the most experienced land-speed record drivers in history. Green also holds the outright land-speed record after driving ThrustSSC to 763.035 mph.
This time, however, the goal was not simply to repeat the Dieselmax achievement. The Hydromax was designed to demonstrate the potential of hydrogen combustion at extreme speed.
How Fast Did the JCB Hydromax Go?
Under FIA land-speed-record procedures, the vehicle must complete runs in opposite directions, with the average speed used to determine the record.
The Hydromax recorded 400.623 mph on its first run and 412.135 mph on its second. The resulting average was 406.320 mph.
That figure was far beyond the previous FIA-recognized hydrogen internal-combustion benchmark of 185.5 mph, set by the BMW H2R in 2004.
The achievement therefore represented a dramatic increase over the previous benchmark for hydrogen internal-combustion vehicles.
What Powers the Hydromax?
At the heart of the Hydromax are two JCB hydrogen internal-combustion engines.
JCB says the engines are based on production engines used in its construction equipment. The two engines are tuned to produce a combined 1,600 horsepower, with each engine producing around 800 horsepower.
The 32-foot-long streamliner was engineered specifically for high-speed stability and efficiency on the Bonneville salt surface. Its twin-engine setup drives all four wheels through a twin-transmission and clutch system.
Rather than using a conventional gasoline or diesel powertrain, the Hydromax burns hydrogen in an internal-combustion engine.
That distinction is important. Hydrogen-powered vehicles can use different technologies, including fuel cells and internal-combustion engines. The Hydromax demonstrates what can be achieved by adapting the internal-combustion approach to hydrogen.
From 368 MPH to More Than 406 MPH
Before attempting the FIA record, the Hydromax had already demonstrated its potential during Bonneville Speed Week.
In August, the streamliner reached 368.347 mph and established an SCTA class record in the Blown Gas Streamliner category. The run gave JCB and the team valuable confidence before the FIA record attempt.
The team then increased the performance of the vehicle for the official attempt, eventually producing the 406.320-mph average.
That progression shows how important testing and incremental development are when operating at extreme speeds.
What Powers the Hydromax?
At the heart of the Hydromax are two JCB hydrogen internal-combustion engines.
JCB says the engines are based on production engines used in its construction equipment. The two engines are tuned to produce a combined 1,600 horsepower, with each engine producing around 800 horsepower.
The 32-foot-long streamliner was engineered specifically for high-speed stability and efficiency on the Bonneville salt surface. Its twin-engine setup drives all four wheels through a twin-transmission and clutch system.
Rather than using a conventional gasoline or diesel powertrain, the Hydromax burns hydrogen in an internal-combustion engine.
That distinction is important. Hydrogen-powered vehicles can use different technologies, including fuel cells and internal-combustion engines. The Hydromax demonstrates what can be achieved by adapting the internal-combustion approach to hydrogen.
What Powers the Hydromax?
At the heart of the Hydromax are two JCB hydrogen internal-combustion engines.
JCB says the engines are based on production engines used in its construction equipment. The two engines are tuned to produce a combined 1,600 horsepower, with each engine producing around 800 horsepower.
The 32-foot-long streamliner was engineered specifically for high-speed stability and efficiency on the Bonneville salt surface. Its twin-engine setup drives all four wheels through a twin-transmission and clutch system.
Rather than using a conventional gasoline or diesel powertrain, the Hydromax burns hydrogen in an internal-combustion engine.
That distinction is important. Hydrogen-powered vehicles can use different technologies, including fuel cells and internal-combustion engines. The Hydromax demonstrates what can be achieved by adapting the internal-combustion approach to hydrogen.
What Powers the Hydromax?
At the heart of the Hydromax are two JCB hydrogen internal-combustion engines.
JCB says the engines are based on production engines used in its construction equipment. The two engines are tuned to produce a combined 1,600 horsepower, with each engine producing around 800 horsepower.
The 32-foot-long streamliner was engineered specifically for high-speed stability and efficiency on the Bonneville salt surface. Its twin-engine setup drives all four wheels through a twin-transmission and clutch system.
Rather than using a conventional gasoline or diesel powertrain, the Hydromax burns hydrogen in an internal-combustion engine.
That distinction is important. Hydrogen-powered vehicles can use different technologies, including fuel cells and internal-combustion engines. The Hydromax demonstrates what can be achieved by adapting the internal-combustion approach to hydrogen.Read More
What Powers the Hydromax?
At the heart of the Hydromax are two JCB hydrogen internal-combustion engines.
JCB says the engines are based on production engines used in its construction equipment. The two engines are tuned to produce a combined 1,600 horsepower, with each engine producing around 800 horsepower.
The 32-foot-long streamliner was engineered specifically for high-speed stability and efficiency on the Bonneville salt surface. Its twin-engine setup drives all four wheels through a twin-transmission and clutch system.
Rather than using a conventional gasoline or diesel powertrain, the Hydromax burns hydrogen in an internal-combustion engine.
That distinction is important. Hydrogen-powered vehicles can use different technologies, including fuel cells and internal-combustion engines. The Hydromax demonstrates what can be achieved by adapting the internal-combustion approach to hydrogen.
A New Chapter at Bonneville
At 406.320 mph, JCB Hydromax has created one of the most remarkable Bonneville stories of 2026.
It combined a legendary racing location, an experienced record-setting driver, production-based hydrogen combustion engines and a purpose-built streamliner into one ambitious engineering project.
Most importantly, the achievement shows that the future of land-speed racing is not necessarily limited to gasoline, diesel or battery-electric technology.
Hydrogen has now added another chapter to Bonneville's long history of speed and innovation.
And with engineers continuing to explore alternative powertrains, the salt flats may once again become the place where the next major chapter in automotive technology is written.