Renault's mid-range engine, the 1.5 dCi, powers one in three of the brand's vehicles, from Twingo to Laguna. Nearly one million units were manufactured in 2010. The new transformed version of the powertrain will initially be available for Mégane / Scénic range before being extended to the other vehicles marketed by the Group.

How the engine works

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The 1.5 dCi metamorphosis 

The Energy dCi 110 engine offers an innovative turbo architecture.

The Energy dCi 110 engine is a real jewel of technologies. Its evolutions compared to the 1.5 dCi engine are: a turbocharger architecture, an individualised spray cone angle and reduced friction, as well as a carryover of the Energy dCi 130's 'technology package'


Energy dCi 110 offers reduced load losses thanks to an innovative turbo architecture. The path where intake air travels, has been simplified to achieve more efficient, uprated turbo performance without increasing fuel consumption. Moreover, a low inertia turbo improves response at low engine speeds thanks to the optimised size of the blade.


The more precise spray pattern significantly improves combustion performance (15 percent less unburned fuel), which in turn has a beneficial effect on fuel consumption and CO2 emissions*. Individualised spray cone angle technology compensates the natural nozzle offset inherent in eight-valve engines due to the asymmetry of the intake and exhaust valves. Injection is ensured by seven-hole piezoelectric injectors.


Friction-related energy losses have been reduced, meaning that less fuel is required to deliver the same quantity of energy. Other benefits are longer engine life and enhanced robustness.

An engine fitted for the Energy family 

Features carried over from the Energy dCi 130 engine's 'technology package' revolve around 3 main technologies: 

  • Stop & Start technology with braking/deceleration energy recovery (ESM) involves automatically cutting the engine when the vehicle is at a standstill. When driving exclusively in built-up areas, fuel savings can amount to more than one litre per 100km. When the driver presses on the clutch pedal again, the engine fires up instantly. To cope with all this repeated starting, the starter motor has been uprated (starter, starter ring gear), as has the fuel injection system (pump and high-pressure injectors). The engine has been engineered for 410,000 starting cycles (over 300,000km), which is almost seven times more than the same figure for a conventional engine. ESM (Energy Smart Management) is a system that allows the kinetic energy produced under deceleration/braking to be recovered by the alternator and stored in the battery. Functions which consume electricity (heater, lights, radio, etc.) are directly fed by the battery to ease the work of the alternator. Recovered energy is notably employed to restart the vehicle.
  • EGR (Exhaust Gas Recirculation): Renault has innovated with the launch of the European market's first engine to feature low pressure EGR technology. This solution recovers exhaust gases further downstream, once they have been through the turbine and particulate filter. They are cooled in a low pressure intercooler which enables them to be recirculated through the turbo mixed with air and thereby increase turbo pressure. The gases are then cooled by air in the turbo radiator and used for combustion a second time. This so-called 'cold loop' enables emissions of nitrogen oxides to be cut more efficiently than is the case with a conventional high pressure EGR, while engine efficiency is improved and combustion is of a higher quality. Low pressure EGR technology calls for an engine architecture that minimises the distance between the catalytic converter / particulate filter and the air intake, an arrangement known as a post-turbo after-treatment system. This proximity enables catalytic converters and particulate filters to function at higher temperatures and therefore more efficiently.
  • Thermostat-controlled automatic-flow rate oil pump: the capacity of the oil pump (and therefore oil pressure) is adjusted as a function of the engine's needs at any given moment in order to reduce the pump's energy consumption. An oil temperature sensor makes real-time adjustments to minimise viscosity-related friction, which has a beneficial knock-on effect on fuel consumption.

Sober and environment-friendly 

The Energy dCi 110 engine offers fuel consumption savings and reduced CO2 emissions thanks to torque increase of 20Nm to 260Nm*, available from as low as 1,750 rpm. The power output remains unchanged with 110 hp at 4,000 rpm.


Thus equipped, Mégane Energy dCi 110 becomes a new spearhead for the range with CO2 emissions as low as 100g/km, equivalent to fuel consumption of just 4 litres/100km*.


The catalytic converter/particulate filter arrangement and low pressure EGR technology facilitate the engine's conversion to Euro 6 legislation. To the same end, the compression ratio has been increased from 15.2:1 to 15.6:1.


* Fuel consumption and CO² emission figures certified under applicable regulations.

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