The four-stroke piston cycle of internal combustion engines starts with the piston at top of the cylinder head (top dead center or TDC) during the intake stroke. The piston moves downward in the cylinder creating a vacuum that pulls an air-fuel mix into the combustion chamber through the now open intake valve.
Which engine stroke starts with the piston at top dead center?
power stroke |
|
compression stroke |
|
intake stroke |
|
exhaust stroke |