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exhaust valve - a valve through which burned gases from a cylinder escape into the exhaust manifold. exhaust system, exhaust - system consisting of the parts of an engine through which burned gases or steam are discharged. valve - control consisting of a mechanical device for controlling the flow of a fluid.
To design a cam and exhaust valve combination with an average open exhaust valve area that is 57.82% of the average open intake valve area, you could estimate it by using an exhaust valve duration or an exhaust valve size or an exhaust valve lift that is 57.82% of the same intake values.