(Automotive Engineering) relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion. US and Canadian name: four-cycle Compare two-stroke
The exhaust stroke of the four-stroke cycle is partly responsible for this, but it works against atmospheric pressure, which in turn is acting in the reverse direction to exhaust flow.
In a four-stroke engine we shift the curve by 1/4 of the four-stroke cycle time so that, when we display the data, the exhausting cylinder's graph is aligned with the same cylinder's crankcase curve when it was in the power stroke." This is just the start of the process.
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