The BMW Z4 is getting two versions of a new all-aluminium 2.0-litre four-cylinder engine, giving 20 per cent more efficiency, resulting in 41.5 mpg and 159 g/km CO2.
The new all-aluminium 2.0-litre four-cylinder unit, featuring BMW’s twin-turbo technology, also delivers improved performance. A six-speed manual gearbox is standard with both engines, but an eight-speed automatic is optionally available.
The new engines will appear in sDrive20i and sDrive28i versions of the Z4, replacing the former sDrive23i and sDrive30i models. For the sDrive20i, the new engine develops 184 hp at 4800 rpm and 270 Nm of torque from only 1250 rpm. Corresponding figures for the sDrive28i are 245 hp from 5000 rpm and 350 Nm from 1250 rpm. Both engines use BMW’s EfficientDynamics technologies.
The BMW Z4 sDrive20i and BMW Z4 sDrive28i employ the twin-scroll turbocharger technology, high-precision direct fuel injection, VALVETRONIC variable valve control and double-VANOS camshaft control previously only seen in six-cylinder BMWs. This gives greater turbo boost pressure and improved operation of the fuel injection system.