This is a shame, as the engine is a real cracker. The vast majority of the torque (95 per cent of which is available from 1500rpm through to 3500rpm) arrives very low down in the rev range, with the turbocharger kicking in nice and early to give you plenty of useable power.
This also means the engine uses less fuel, resulting in CO2 emissions being cut by 18 per cent compared to an equivalent PSA four-cylinder unit. However, it’s not just the reduction in cylinders that has contributed to the improved C02 emissions and great economy.
Citroën has worked hard on limiting the engine’s mechanical losses, so by adjusting the size of the crankshaft, offsetting the cylinders and using a lubricated timing belt, the French car maker has managed to significantly cut reduce internal friction, thus further improving efficiency.
Should I buy one?
Undoubtedly this engine is going to prove successful for Citroën (the DS3 notwithstanding, it’s also going to be installed in the innovative new Cactus), and is further proof that the motor industry is coming up with clever solutions to combat ever-more stringent emissions legislation.
The C4 is not PSA’s most modern car on the road though; that honour goes to the European Car of the Year – the Peugeot 308, which is getting the new three-cylinder engine this month, too. The Pug would probably be a better option than the C4, since the Citroën is rather long in the tooth now. Alternatively, you might even consider Volkswagen Group’s excellent 1.2 and 1.4 TSI engines which are installed across most of its range of cars.
Alternatively, for more or less the same money as the C4, you could get behind the wheel of the dynamically superior Focus – and driver reward is always a deal-breaker as far as we’re concerned.
Citroën C4 e-THP 130
Price £17,990; 0-62mph 10.8sec; Top speed 124mph; Economy 57.7mpg; CO2 114g/km; Kerb weight 1280kg; Engine 3 cyls, 1198cc, turbocharged, petrol; Power 128bhp at 5500rpm; Torque 170lb ft at 1750rpm; Gearbox 6-spd manual