Engines and fuel cells: hydrogen power trade‑offs for plant engineers
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
JCB has developed 55 kW hydrogen internal combustion engines for backhoes and generators, using very lean burn with high air excess, turbocharging and roof‑mounted 350 bar tanks to avoid NOx‑forming hot spots and match diesel performance without redesigning engine bays. The company reports more than 50,000 hours of test cell and field operation, with operators describing behaviour as identical to diesel and refuelling times remaining “in minutes”. Toyota, by contrast, is scaling its Mirai Generation 2 fuel‑cell stack into Hilux light commercial vehicles, with ten UK‑built prototypes and a focus on steady on‑road duty cycles.
Technical Brief
- JCB’s hydrogen ICE concept emerged after 20-tonne fuel-cell excavator prototypes proved unsuited to 27‑second dig cycles.
- Fuel-cell efficiency on JCB’s trial excavators fell markedly at high load, opposite to diesel-style duty requirements.
- Beamish’s team initially relied on legacy hydrogen combustion data, then rebuilt models after poor simulation–test correlation.
- Around 40 early combustion simulations were discarded; over 200 revised mixing simulations now underpin the final design.
- Design intent was to keep the hydrogen engine within existing backhoe loader arm envelope to avoid chassis redesign.
- JCB structured manufacturing so hydrogen and diesel engines can be alternated on the same assembly line mix.
- Hydrogen adoption on projects like the Lower Thames Crossing is framed as contingent mainly on reliable fuel supply, not drivetrain readiness.
Our Take
JCB’s ability to move from concept to working hydrogen engines in months, while still producing around 199 diesel engines per day, suggests it can pilot hydrogen power in niche UK and northern Europe applications without disrupting the mainstream fleet renewals seen in recent Select Plant Hire and Ashbrook orders.
The 350‑bar hydrogen storage and 55 kW-class engines look sized for mid-range plant, which aligns with the 20-tonne excavator segment already prominent in our JCB coverage and could give contractors a practical decarbonisation option on projects like the Lower Thames Crossing where air-quality constraints are tight.
Toyota’s long fuel-cell development arc from the 1990s to the Mirai and Hilux prototypes indicates that JCB’s hydrogen combustion route is a comparatively low-infrastructure bridge technology, allowing UK contractors to cut on-site diesel use even while, as the article notes, roughly half of national energy supply remains non-renewable.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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