The US-based powertrain specialist Cummins is showcasing the B6.7H hydrogen combustion engine at Busworld 2025 in Brussels (October 4–9). The unit is designed for use in intercity and long-distance coaches with a length of nine to twelve meters. Cummins first introduced this hydrogen engine in a concept truck in 2022. It was already on display at Busworld 2023 for coaches in the specified length range. In 2024, it was also exhibited at the agricultural trade fair EIMA, configured for agricultural applications.
The B6.7H delivers 216 kilowatts (290 hp) and achieves a maximum torque of 1,200 newton meters. It uses hydrogen as fuel and, according to Cummins, is intended to offer diesel-like driving performance. A key feature of the engine is its high level of component commonality with existing diesel and natural gas variants. This allows the B6.7H to be integrated into existing vehicle platforms without requiring extensive modifications to the vehicle layout.
Cummins sees the technology as a practical solution for OEMs and operators seeking to adopt low-emission powertrains without switching to battery-electric or fuel cell solutions. “The B6.7H enables progress toward very low emissions in a way that is familiar to OEMs and operators,” the company states in its press release.
The hydrogen combustion engine is part of a broader portfolio that Cummins is presenting at the trade fair. This includes the new X10 Euro VI diesel engine, the L9N natural gas engine, and battery systems from its subsidiary brand Accelera. In addition, Cummins is introducing a new independent front suspension (IFS axle).
The presentation of the B6.7H takes place against the backdrop of upcoming Euro 7 and CO2 limits for heavy-duty vehicles. With its offering, Cummins aims to provide vehicle manufacturers with a wider range of powertrain technologies to facilitate the transition to lower-emission fleets.
