Skyactiv-X

In 2021, Mazda introduced the 2-litre e-Skyactiv-X engine, the first production petrol engine worldwide to harness diesel-like compression ignition technology. This innovation is called Spark Controlled Compression Ignition, or SPCCI. While the Skyactiv-X engine primarily burns petrol, it employs a diesel ignition approach to light the air-fuel mixture. Unlike traditional diesel engines that operate without spark plugs, Mazda’s engineers devised a method to incorporate a spark plug, allowing for precise spark timing and combustion control. As a result, the engine can effortlessly alternate between standard spark ignition and compression ignition by utilising the spark in distinct ways for each combustion type.

The X engine is combined with Mazda’s M Hybrid system, a mild hybrid system that uses a small capacitor to capture and store energy generated when the brakes are applied. The stored electricity is used to assist the engine (minimally) and power the vehicle’s electrical systems. The M Hybrid system does not drive the wheels – its intended purpose revolves more around efficiency. Along with improved fuel consumption (up to 30% improvement over regular ICE engines of similar capacity), exhaust gas emissions have been significantly reduced, too. A Mazda3 Skyactiv X’s CO2 emissions are around 155 g/km. As a reference, the average amount of carbon dioxide (CO2) emitted by a passenger car is around 400 grams/mile.