The exhasut stroke is the fourth of four stages in an internal combustion engine cycle. In this stage host gases from the fuel ignited during the compression step are removed from the cylinder through a valve at the top of the cylinder. The gases are forced up to the top of the cylinder as the piston rises and are drawn through the opening which then closes to allow fresh fuel into the cylinder so the the process can repeat itself. A colorized automobile engine The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber. ... Fuel is any material that is capable of releasing energy when its chemical or physical structure is changed or converted. ... Look up cylinder in Wiktionary, the free dictionary. ... A valve is a device that regulates the flow of fluids (either gases, fluidized solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways. ...
At high rotational speeds, consistent flow through the intake and exhaust ports is maintained by allowing the intake and exhaust valves to be open simultaneously at top dead center.
The momentum of the exhausting gas maintains the outward flow and initiates the induction flow.
When exhaust ports are close together and feeding into a manifold, the pressure wave of another exhausting cylinder may interfere with the first, trapping exhaust gasses.
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