Miller Cycle

It is related to the Atkinson cycle but uses forced induction to recover lost power. Several modern turbo petrol engines use it to cut fuel consumption. Higher geometric compression and lower combustion temperatures also help reduce knock.

Variable valve timing changes when the intake valve closes, and the turbocharger fills the cylinder so power is maintained.

The system depends on accurate valve timing, so phaser or oil supply faults show up quickly. Use the oil specification required by the manufacturer.