As an engine maker in the world of F1, Renault makes full use of its experience by refining the energy efficiency of its road car engines to deliver better driving enjoyment. The latest output of the firm’s downsizing strategy is the Energy dCi 160 Twin Turbo, the first 1.6-liter diesel engine to benefit from twin-turbocharging. This 1,598 cc block delivers 160 hp and 380 Nm of torque.
Improved performance thanks to twin-turbocharging
The use of ‘Twin Turbo’ technology for this diesel engine ensures a better low-end torque and higher power at higher revs. The system comprises two sequential turbo-compressors:
- The first is a low inertia turbo which provides high low-end torque. 90% of peak torque is available from 1,500rpm.
- The second turbo produces high power at faster engine speeds.
This engine embeds some innovative technologies, notably in terms of cooling and friction reduction:
- The transverse water flow system permits faster and more efficient cooling of the combustion chamber.
- ‘U’-section U-Flex piston rings adapt to changes in the form of the cylinder walls resulting from fluctuations in temperature and pressure.
- DLC (Diamond Like Carbon) super-finishing of the cam followers also reduces friction.
The fuel injection system of the Energy dCi 160 Twin Turbo operates at a pressure of 1800 bar to function with the twin turbocharger. It complies with Euro 6b emissions legislation and incorporates a NOx Trap and particulate filter regeneration system.
This engine is capable of powering larger vehicles, and will notably be available for Renault’s forthcoming D- and E-segment models.
Twin-turbocharging is the most advanced downsizing technology today. But it is only applied to less cost sensitive segments (high end segments). Do you think that Renault will apply this technology to its K9K 1.5l dCi? Do you think they will use twin-turbocharging on gasoline engines?