Baytech GM 6.0 L

The register lists here 3 versions with 293 to 323 hp rated output at 4,300 to 4,600 rpm, all with sequential injection and natural gas as fuel. Maximum torque ranges from 368 to 373 Nm at 4,000 to 4,400 rpm, model years from 2012 to 2013.

Such natural-gas engines drive medium-duty commercial vehicles such as distribution and municipal vehicles, where the switch to natural gas brings lower local pollutant emissions compared with similar diesel or petrol engines. The base remains a proven GM petrol engine design, which eases access to mechanical parts, while the gas system itself and its tuning call for specialist service.

Such GM-petrol-based conversion engines run, like their base engine, on the Otto cycle with spark ignition and a stoichiometric mixture; exhaust treatment is therefore handled by a conventional three-way catalytic converter rather than the exhaust-gas recirculation, particulate filter or SCR system required on a comparable diesel. Range remains tied to the available natural-gas fuelling infrastructure, so such vehicles mostly operate on a depot basis, returning to their own filling point.

On a used purchase, the tightness of the gas system counts, along with the condition of the high-pressure tanks and lines, the spark plugs and injection valves, and the service history of the gas pressure regulator; service and spare parts for these converted engines are concentrated among specialist US workshops.