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. A stroke refers to the full travel of the piston along the cylinder, in either direction. … Combustion: Also known as power or ignition.
How does a 4 stroke SI engine work?
Four-Stroke Cycle SI Engine In the SI engine, fuel is mixed with air, broken up into a mist, and partially vaporized. The compression ratio varies from 4:1 to 8:1, and the air–fuel mixture ratio varies from 10:1 to 20:1. The four strokes of a petrol engine sucking fuel–air mixture are shown in Fig.
Why 2 stroke engine is not used in cars?
There are four main reasons: Two-stroke engines don’t last nearly as long as four-stroke engines. The lack of a dedicated lubrication system means that the parts of a two-stroke engine wear a lot faster. … You would burn about a gallon of oil every 1,000 miles if you used a two-stroke engine in a car.
What are the 4 cycles of an engine?
An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.