English to Polish Tech/Engineering Automotive / Cars & Trucks

Opening the exhaust valve earlier helps, but it forfeits cylinder pressure that could still be driving the piston. With early exhaust valve opening, larger pipes are required to optimize scavenging wave arrival time. Since these wave changes occur many times during a single exhaust event, they also become progressively weaker. There are counteracting forces at work here. Higher engine speeds require shorter pipes and earlier exhaust valve opening, but early opening requires longer pipes to optimize scavenging. A delicate balance is required.

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