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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.
A turbo is a basic air pump that pushes a volume of air into the engine, which increases the power output. This turbo is driven by a turbine in the exhaust system, connected by a direct shaft to an impeller in the intake system.The more exhaust that flows, the more air is pumped into the engine.In most automotive and some other applications, a wastegate is provided which opens as intake system pressure is raised to a preset level by the turbo.he more exhaust that flows, the more air is pumped into the engine. In most automotive and some other applications, a wastegate is provided which opens as intake system pressure is raised to a preset level by the turbo.