2-CYLINDER GASOLINE
RANGE EXTENDER ENGINE.

HIGHLY EFFICIENT AND EXTREMELY COMPACT.

Very smooth-running and quiet 2-cylinder engine with a displacement of 647 cc and 25 kW rated power output at 4300. In the BMW i3 this twin-cylinder engine is performing as an optional range extender (REx). The motor drives a generator which in turn charges the high-voltage battery so that the vehicle can continue to drive electrically. If the optional range extender is employed, the BMW i3 will be able to travel more than 100 kilometers farther before refueling.

  W20
* depending on vehicle
Engine type Engine type  2-cyl. Inline engine
Displacement [ccm] 647
Bore x stroke [mm] Water-cooled 4-stroke in-line two-cylinder engine (four valves per cylinder, two overhead camshafts, dry sump lubrication)
Power [kW] @ [1/min] 25 @ 4.300
Torque [Nm] @ [1/min] 55 @ 4.300
Emission standard EU6
CO2 range [g/km]* 13
  W20
* depending on vehicle
Engine type Engine type  2-cyl. Inline engine
Displacement [ccm] 647
Bore x stroke [mm] Water-cooled 4-stroke in-line two-cylinder engine (four valves per cylinder, two overhead camshafts, dry sump lubrication)
Power [kW] @ [1/min] 25 @ 4.300
Torque [Nm] @ [1/min] 55 @ 4.300
Emission standard EU6
CO2 range [g/km]* 13