Mazda Skyactiv-G details you might want to share with others | DSF.my

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

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

  1. Felix says:

    My 2014 Mazda 3 2.0 skyactive engine easily achieve 950km pertank on highway drive. One tank full can travel from southern Malaysia Johor state all the way to Thailand border with just one full tank. 967km.
    Personally, really hard to get a 2.0liter Na engine to achieve 22.4km/ liter of fuel.
    Mazda is awesome

  2. Ethan says:

    My 2018 Mazda 3 2.0 seems to prefer Ron 97 a lot. Feels responsive. With Ron 95, it feels sluggish and slow to respond. I think the engine has to retard its timing or something to prevent knocking with Ron 95.

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