What does the intake stroke do

The power stroke is an engine operation Stroke in which hot expanding gases force the piston head away from the cylinder head. Piston force and subsequent motion are transferred through the connecting rod to apply torque to the crankshaft. ... During the power Stroke, both valves are closed.A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. ... In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below).Simply put, Top Dead Center (TDC) is the position of an engine's piston when it is at the very top of its stroke. Depending on weather you need to be on the compression stroke or not there are many methods that you can use: Compression tester.The piston makes four strokes and the crankshaft makes two revolutions between combustion firings. The diameter of the piston, and the inside diameter of the cylinder, is called the bore - B. So the area A of the head of the piston is pi (3.14159) times the diameter squared divided by four.The stroke length is how far the piston travels in the cylinder, which is determined by the cranks on the crankshaft. Engine displacement is calculated by multiplying the cross-section area of the cylinder (determined by the bore) by the stroke length.