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The two vortices also remain independent layers throughout most of the compression stroke.

Then the compression stroke starts and the cycle repeats.

On the compression stroke of the piston, the fresh air is forced through the narrow neck and into the vaporizer.

Can have different port timing on compression stroke than power stroke allowing better control.

You'll note that each compression stroke results in water gushing up through the hole.

During the compression stroke, air from the main cylinder enters the precombustion chamber.

This happens at around 20% to 30% into the compression stroke.

At the end of the isothermal compression stroke, you do your part again.

It also closes the intake valves sooner on the compression stroke.

The compression stroke is one part of an engine's four-cycle system.