The new petrol power plant with direct injection is based on the Prince engine developed in partnership with BMW and replaces the 1.6-litre THP 155 Euro 5 power plant, gaining 10 hp in the process and cutting CO2 emissions to 129 g/km, improving on a best of 144 g/km for the previous generation.
The new turbo design helps to ramp up the power and improve pick-up at low revs. Pressure has been boosted from 120 bar to 200 bar to improve fuel injection, which enhances the combustion process and significantly reduces unwanted emissions. The increase in pressure, with a new angle for the injection nozzle, dual injection and a high-pressure start also significantly reduces particulate emissions.
The improvement of approximately 18% in fuel consumption compared with the previous model is the result of:
- The introduction of Stop & Start technology;
- The increased efficiency of the EAT6 automatic transmission system;
- Optimal management of electrical and hydraulic energy (on-demand water pump and variable capacity oil pump);
- Reduced friction inside the engine due to carbon covering for the piston skirts, derating, piston pins coated in Diamond Like Carbon (DLC) and fine machining of camshaft bearings.