page_title: SkyActiv
section_title: Skyactiv-X
hierarchical_section_title: SkyActiv / Skyactiv-X
caption_attribution_description: English: Mazda SkyActiv-X at the Tokyo Motor Show 2019. 日本語: マツダ・SKYACTIV-Xのカットモデル（東京モーターショー2019出展）。
context_page_description: Skyactiv is a brand name for a series of technologies developed by Mazda that increase fuel efficiency and engine output. The initial announcement of the Skyactiv technologies included new engines, transmissions, body, and chassis, which appeared in Mazda products from 2011.
context_section_description: Skyactiv-X is the first commercial petrol engine to use compression ignition, in which the fuel-air mixture ignites spontaneously when compressed by the piston. This allows it to operate much leaner than a spark ignition engine, reducing fuel consumption and emissions.
  This engine targets 20-30% greater fuel efficiency by utilising homogeneous charge compression ignition (HCCI) technology. In order to handle ignition problems caused by compression ignition, each cylinder also incorporates a spark plug featuring Spark Controlled Compression Ignition (SPCCI) technology.
  SPCCI works by drawing in a lean, homogenous air-fuel mixture, it then compresses the mixture until it approaches the point at which it would spontaneously detonate. A second injector then adds a secondary charge of fuel directly on the spark plug. This secondary charge is ignited by the spark plug, causing the cylinder pressure to very quickly rise to a point where the rest of the fuel undergoes compression ignition. The presence of the spark plug allows the engine to also operate as a spark-ignition engine under some operating conditions, such as high-speed high-load situations. Revealed June 5, 2019, the output is 132 kW (177 hp) and 224 N⋅m (165 lbf⋅ft).
caption: Skyactiv-X cutaway
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