Lesson 2/Learning Event 1
FIGURE 37. FOUR-STROKE-CYCLE DIESEL ENGINE.
The intake and exhaust systems of the four-stroke-cycle diesel engines are similar to those of gasoline engines.
One big difference is that diesel engines do not have carburetors which are found in the intake system of
gasoline engines. All present four-stroke-cycle diesel engines have at least one intake and one exhaust valve per
cylinder, but some may have two exhaust valves and two intake valves. Most diesel engines have intake and
exhaust manifolds with one inlet or outlet port per cylinder. Many compression-ignition engines use a
supercharger, which is an air blower located in the intake system. It increases the horsepower output of the
engine.
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