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Power
Transmission and Technology Menu
In a four-stroke engine the camshaft is geared
so that it rotates at half the speed of the crankshaft (1:2).
This means that the crankshaft must make two complete
revolutions before the camshaft will complete one revolution.
The following will describe a four-stroke, normally aspirated,
diesel engine having both intake 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
intake stroke. All the timing marks given are generic and will
vary from engine to engine.
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