| 1. | The two vortices also remain independent layers throughout most of the compression stroke.
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| 2. | It also closes the intake valves sooner on the compression stroke.
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| 3. | First, it travels downward on the intake stroke, then up on the compression stroke.
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| 4. | Injection was timed to occur at or near the peak of the compression stroke.
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| 5. | The intake stroke is followed by the compression stroke.
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| 6. | The piston then moves downward, where the air-fuel mixture remains from the previous intake-compression stroke.
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| 7. | However, it injects fuel later, during the compression stroke.
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| 8. | Then the compression stroke starts and the cycle repeats.
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| 9. | Near the end of the compression stroke, the layers collapse into uniform minute turbulences, which effectively promote lean-burn characteristics.
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| 10. | Two-stroke motorcycle engines, where the arrangement helps to prevent reverse flow back into the intake port during the compression stroke.
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