Peugeot's 308CC coupe cabriolet is the first model in the company's UK range to get a new 112hp 1.6-litre HDi FAP [particle filter] Euro 5-compliant diesel engine. Over half the parts in the updated motor are new.

The four cylinder, eight valve engine develops maximum torque of 270Nm at 1,750rpm - up 12.5% over the 110hp unit it replaces.. Overboost torque is 285Nm versus 260Nm.

The engine has PSA's so called Extreme Combustion Chamber System (ECCS) technology with a lower compression ratio (16.0 compared to 17.5 previously) for enhanced performance and reduced emissions (including NOx), a 10% increase in the diameter of the combustion chamber to reduce the quantity of unburnt fuel as a result of less contact with the chamber "walls" and a 10% reduction in swirl (air movement in the combustion chamber), reducing heat loss against the walls.

This is combined with a new common rail injection system (Continental Automotive System) where the injection pressure is increased to 1,650 bars (compared to1600 previously) as well as new piezo-electric injectors with seven apertures (instead of solenoid injectors with six apertures as fitted to the previous 110hp 1.6 litre HDi engine).

Engine management software has been redesigned to give this unit more comprehensive injection mapping (up to 5 injections per cycle), improved efficiency and better diagnostics when servicing. This helps to improve the air/diesel fuel mixture for maximum performance, reduced fuel consumption, a reduction of emissions at source and quieter combustion.

The engine has a Honeywell Turbo Technology variable geometry turbocharger optimised for size. Being smaller, it has a lower inertia, reducing response times to a minimum. An improved exhaust gas recirculation system (EGR valve) and the reduction of internal friction losses allows maximum engine efficiency while minimising potential energy losses.

Like its predecessor, this 1.6 litre HDi comes standard in the UK with a diesel particulate emission filter (FAP) with a service life of 112,000 miles.

The new engine initially will be available in the 308CC in both Sport and SE trim levels and will be known as the HDi 112.