4. Effects of supercharging on engine operation
4.1 Transfers
In addition to the transfer phenomena linked to piston movement, which are predominant in the 4-stroke cycle, scavenging phenomena can occur, similar to those found in 2-stroke engines. These are caused by pressure differences between intake and exhaust, which can generate a flow during the period of simultaneous opening of intake and exhaust valves (valve "crossover" period).
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If p a > p e , flow will be established in the intake-to-exhaust direction, causing the engine to overbalance. The flow delivered by the compressor will be greater than the cylinder's filling capacity, hence λ > η v ...
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Effects of supercharging on engine operation
Characterizing supercharger performance
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