Rolls Royce Lean Burn Technology

Aviation engine environmental performance has become the focus of customers and legislators, all together with efficiency and reliability. Rolls Royce set a program to develop a new lean burn and low emissions combustion system, reducing fuel burn and improving emissions performance. A demonstrator engine specifically devoted to extreme reduction of pollutant emissions has been developed as pioneering technology vehicle.

The ALECSys (Advanced Low Emissions Combustion System) demonstrator is testing a lean burn system that improves the pre-mixing of fuel and air prior to ignition – delivering a more complete combustion of the fuel and, as a result, lower NOx and particulate emissions.

Rolls Royce Lean Burn – ALECSys Programme

Rolls-Royce Lean Burn Combustion test engine runs for first time

Rolls Royce Lean Burn – R&D



Rolls Royce has equipped a Trent 1000 engine with its Advanced Low Emission Combustion System test vehicle, namely ALECSys.

The engine underwent cold-weather rig trials in Canadian province Manitoba at temperatures of -20°C (-4°F) a month after initial ground tests at R-R headquarters in Derby.