Q: Technology Automotive
A: Intake - Exhaust valve is closed, intake valve opens, piston travels to the bottom of the cylinder Compression - Exhaust valve is closed, intake valve closes, piston rises to the top of it's stroke Ignition - Exhaust and intake valves are closed, gasoline ignition pushes the piston to the bottom of the stroke (turning the crank shaft) Exhaust - Exhaust valve opens, intake valve closed, piston rises to the top of its stroke