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Power
Transmission and Technology Menu
Like the four-stroke engine, the two-stroke
engine must go through the same four events: intake,
compression, power, and exhaust. But a two-stroke engine
requires only two strokes of the piston to complete one full
cycle. Therefore, it requires only one rotation of the
crankshaft to complete a cycle. This means several events must
occur during each stroke for all four events to be completed in
two strokes, as opposed to the four-stroke engine where each
stroke basically contains one event.
In a two-stroke engine the camshaft is geared
so that it rotates at the same speed as the crankshaft (1:1).
The following (links at bottom of page) will describe a two-stroke, supercharged,
diesel engine having intake ports and exhaust valves with a
3.5-inch bore and 4-inch stroke with a 16:1 compression ratio,
as it passes through one complete cycle. We will start on the
exhaust stroke. All the timing marks given are generic and will
vary from engine to engine.
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