Miller cycle

• Only for 4stroke  engines.
• In Miller cycle inlet valve closes early.
• NOx reduction , As inlet valve close early when the piston moves down little bit of expansion of inlet air will occur , exhaust temp drops and NOx emission reduces.
• Normally inlet valve should close around 29 degree after BDC , as the miller cycle introduces , the inlet valve closing is earlier.

Draw back of Miller cycle.

Since the closing of inlet valve is early , the amount of air inside the cylinder is reducing . So further we have to combine it with multistage T\C (To compensate the loss in air )