When intake air is compressed in the
turbocharger, its temperature rises sharply. As a result, air density is reduced and the cylinders receive less fresh air than the system’s boost pressure prescribes. The risk of knock in spark-ignition engines also increases. These drawbacks are countered by charge-air intercooling, which passes the air leaving the
turbocharger through a special cooler, air intake is increased and the thermal load is reduced.
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