Chiron's piston movement and consequently its combustion process differs from a conventional crankshaft engine.
Especially at reduced frequency significant differences between the two piston movements can be seen. The combustion conditions of a Chiron can be optimized as the piston movement is independent of the engine's power output. In a conventional engine the entire piston movement is stretched as a function of time, resulting also in a slower piston movement during combustion.
At maximum frequency there are significant differences in piston dynamics around TDC. One millisecond after TDC, the piston in the crankshaft engine has accelerated to a speed of 3 m/s. In the same period the piston in the Chiron has accelerated to a velocity of 18 m/s, 6 times the value of the conventional engine. High piston speed results in high gas velocities during combustion. This reduces both NOx and soot emissions and increases the indicated efficiency.