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Friday 18 April 2014 • 18:50 GMT • Last update 16:46

Intercooler

110713-SubaruIntercooler-461

An intercooler cools the intake air in a forced induction engine.

When the intake air is compressed its temperature rises, and an intercooler may be used to ensure the temperature does not reach a level which may cause reliability problems – eg detonation.

An intercooler (the silver component in the engine bay above, carrying the STi logo) will also ensure the intake air remains dense, maximising the effect of forced induction.

An intercooler is a heat exchanger which takes heat from the intake air. It may be cooled by air flow (air/air intercooler) or by water flow (water/air intercooler or chargecooler).

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