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Intake, induction or suction: The intake valves are open as a result of the cam lobe pressing down on the valve stem.
The piston performs work on the charge as it is being compressed; as a result its pressure, temperature and density increase; an approximation to this behavior is provided by the ideal gas law.
When the piston is near to BDC the exhaust valve opens.
The combustion gases expand irreversibly due to the leftover pressure?in excess of back pressure, the gauge pressure on the exhaust port?; this is called the blowdown. Exhaust: The exhaust valve remains open while the piston moves upward expelling the combustion gases.For naturally aspirated engines a small part of the combustion gases may remain in the cylinder during normal operation because the piston does not close the combustion chamber completely; these gases dissolve in the next charge. At the end of this stroke, the exhaust valve closes, the intake valve opens, and the sequence repeats in the next cycle. The intake valve may open before the exhaust valve closes to allow better scavenging. Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine
Most cars are designed to carry multiple occupants, often with four or five seats.Cars with five seats typically seat two passengers in the front and three in the rear. Full-size cars and large sport utility vehicles can often carry six, seven, or more occupants depending on the arrangement of the seats. In the other hand, sports cars are most often designed with only two seats.
The differing needs for passenger capacity and their luggage or cargo space has resulted in the availability of a large variety of body styles to meet individual consumer requirements that include, among others, the sedan/saloon, hatchback, station wagon/estate, and minivan.Źródło: https://en.wikipedia.org/wiki/Car_classification.