Understanding The Features Of SKYACTIV-G
A new-generation highly-efficient direct-injection petrol powered engine that achieves the world’s highest gasoline engine compression ratio of 14.0:1.
4 Main Features Of SKYACTIV-G
- The world’s first gasoline engine for mass production vehicles to achieve a high compression ratio of 14.0:1
- Significantly improved engine efficiency thanks to the high compression combustion, resulting in 15 percent increases* in fuel efficiency and torque
- Improved everyday driving thanks to increased torque at low- to mid-engine speeds
- A 4-2-1 exhaust system, cavity pistons, multihole injectors and other innovations enable the high compression ratio
*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 torque vary according to market, carline and transmission.
3 Merits & Issues Of A High Compression Ratio
- Increasing the compression ratio considerably improves thermal efficiency. The compression ratio of recent gas engines is generally around 10:1 to 12:1.
- Theoretically, if the compression ratio is raised from 10:1 to 15:1, the thermal efficiency will improve by roughly 9%. However, one of the reasons preventing the spread of high compression ratio gas engines is the large torque drop due to knocking.
- Knocking is abnormal combustion in which the air-fuel mixture ignites prematurely due to exposure to high temperature and pressure, creating an unwanted high-frequency noise. When the compression ratio is increased, the temperature at compression top dead center (TDC) also rises, increasing the probability of knocking.
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
What speed do you drive at on the highway?
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.