An internal combustion engine has two exhaust valves (24, 25) per combustion chamber (21), and variable valve timing for each exhaust valve. The exhaust valves (24, 25) are associated with respective exhaust tracts (26, 27) including a turbocompounder (31) and a turbocharger (41). The turbine exhaust from one of the turbomachines is directed to turbine inlet of another of the turbomachines.