It is a Ford ST220 Engine. It is a chain driven system.
GoMog has details on the S1 Roadster only but the dealers were told
GENERAL SPECIFICATION
Engine Ford MEBA
Bore of cylinder (mm) 89
Stroke (mm) 79.5
Cubic capacity 2967cc
Firing order 1, 4, 2, 5, 3, 6
Maximum engine rpm 6700 (Never exceeded)
Power EEC @ rpm (BHP) 166 kw @ 6150 (226PS)
Torque EEC (ft/lbs) 280 NM (206 lb ft) @ 4900 rpm
Valve operation Double overhead camshaft per bank, chain driven,
hydraulic tappets, 4 valves per cylinder