The four steps of combustion in an internal combustion engine are:
1.
Intake – The piston moves down, and the intake valve opens to let air (and fuel) into the cylinder.
2.
Compression – The piston moves up, compressing the air-fuel mixture with both valves closed.
3.
Power (or Combustion) – The spark plug ignites the compressed mixture, causing an explosion that pushes the piston down.
4.
Exhaust – The piston moves up again, pushing out the burned gases through the open exhaust valve.
These steps happen in order and repeat continuously while the engine runs.
Final Answer:
Intake, Compression, Power, Exhaust
Parent Tip: Review the logic above to help your child master the concept of small engine worksheet.
