According to Mazda, that means ten to 30 per cent more torque than the current Skyactiv-G engines and, crucially, 20 to 30 per cent more efficiency thanks to the new engine’s “super lean burn”.
With homogeneous charge compression ignition (HCCI), there is no single thing, such as a spark plug, that can control autoignition. Ambient air temperature, air pressure, fuel quality, air-fuel ratio, turbocharger boost, engine speed, engine load and valve timing all come into play and each could affect exactly when combustion happens.
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