Lis Sidoline. The FA20E and FA20F engines have a cast aluminium alloy cylinder head with chaindriven double overhead camshafts per cylinder bank The four valves per cylinder – two intake and two exhaust – were actuated by roller rocker arms which had builtin needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms.
The EJ201 and EJ202 engines had an aluminium alloy cylinder head with crossflow cooling Unlike the EJ20 engine the intake ports for the EJ201 and EJ202 engines created a ‘tumble swirl’ motion for air as it entered the cylinder for better mixing of the air and fuel for more uniform flame travel and faster combustion.