THE engine line-up for the BMW 4 Series range of coupe, convertible and Gran Coupe will be refreshed in the next few months.

The flagship engine will be reinvented and improved once again to create a new six-cylinder in-line unit with BMW TwinPower Turbo technology, with a maximum output of 326bhp, an increase of 20bhp from the previous generation.

In the new BMW 440i Coupe the engine will channel its power through a six-speed manual gearbox as standard or an eight-speed Steptronic transmission as an option.

With a 0.2 second improvement, the BMW 440i Coupe will now accelerate from zero to 62mph in just 5.2 seconds (automatic: 5.0 seconds), the BMW 440i Convertible completes the same sprint in 5.4 seconds and the BMW 440i Gran Coupe posts a figure of 5.1 seconds.

Fuel consumption and COemissions are both reduced by up to 12 per cent and now stand at 36.7mpg (41.5mpg) for the BMW 440i Coupe, 39.2mpg for the BMW 440i Convertible 41.5mpg for the BMW 440i Gran Coupe.

The new four-cylinder petrol engines available for the BMW 4 Series have also been improved to enhance sporting performance and efficiency. With output raised to 252bhp and peak torque of 350Nm, the most powerful latest-generation four-cylinder unit provides a zero to 62mph time of 5.9 seconds (5.8 seconds) for the new BMW 430i Coupe, 6.4 seconds (6.3 seconds) for the new BMW 430i Convertible and 5.9 seconds (5.9 seconds) for the new BMW 430i Gran Coupe.