Why is an Atkinson cycle engine more efficient than a conventional four-cycle engine?
What will be an ideal response?
The Atkinson cycle is more fuel efficient than a conventional four-stroke cycle engine and is often described as five-cycle engines. The five cycles are typically called intake, back-flow, compression, power (expansion), and exhaust. During the back-flow cycle, the mixture moves back into the intake manifold to reduce pumping losses. Pumping losses represent the power lost when the engine rotates during periods of high vacuum. Because the intake valve closes after the piston begins its compression stroke, some of the incoming air/fuel mixture is pushed back into the intake manifold, which reduces the effective volume or displacement of the cylinder and provides an instant charge of mixture for the next cylinder in the firing order. These engines have a high static compression ratio but operate at a low compression ratio. This is due to the loss of compressed gases into the intake manifold.
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