Published on August 12th, 2019 | by Daniel Sherman Fernandez


Mazda Skyactiv-G details you might want to share with others

Understanding The Features Of SKYACTIV-G

A new-generation highly-efficientdirect-injection petrol powered engine that achieves the world’s highestgasoline engine compression ratio of 14.0:1.

4 Main Features Of SKYACTIV-G

  1. The world’s first gasolineengine for mass production vehicles to achieve a high compression ratio of14.0:1
  2. Significantly improved engineefficiency thanks to the high compression combustion, resulting in 15 percentincreases* in fuel efficiency and torque
  3. Improved everyday drivingthanks to increased torque at low- to mid-engine speeds
  4. A 4-2-1 exhaust system, cavitypistons, multihole injectors and other innovations enable the high compressionratio

*The 15% improvement in fuel efficiency and torque was calculated by comparing SKYACTIV-G to Mazda’s current petrol powered engine sitting in the all new 2019 Mazda3.

Compression ratio, fuel economy and torquevary according to market, carline and transmission.

3Merits & Issues Of A High Compression Ratio

  1. Increasing the compressionratio considerably improves thermal efficiency. The compression ratio of recentgas engines is generally around 10:1 to 12:1.
  • Theoretically, if thecompression ratio is raised from 10:1 to 15:1, the thermal efficiency willimprove by roughly 9%. However, one of the reasons preventing the spread ofhigh compression ratio gas engines is the large torque drop due to knocking.
  • Knocking is abnormal combustionin which the air-fuel mixture ignites prematurely due to exposure to hightemperature and pressure, creating an unwanted high-frequency noise. When thecompression ratio is increased, the temperature at compression top dead center(TDC) also rises, increasing the probability of knocking.

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