The Volvo S40 Intercooler makes the life of turbocharged engines easier as it cools the hot compressed air prior to passing through the cylinders; denser oxygen will be present and eliminate knock. The Intercooler removes the heat energy generated by a turbocharger to enable the engine to burn more fuel safely, providing the compact Volvo sedan with the power of engines with more displacement but without loss of efficiency. The charge air is heated and moves through the finned tubes, where it exits to ambient air or passes through a circulating liquid that eventually dissipates the heat to the ambient air via a separate radiator. Air-to-air designs depend on the speed of the vehicle and the nearby airflow, providing a less bulky package with fewer components, whereas air-to-liquid structures include pumps and hoses, which increase weight but ensure a constant temperature when there is not enough airflow, such as in slow traffic or in crowded engine bays. Volvo has over time fitted petrol S40s predominantly with an air-to-air layout in the front mainly due to its suitability to everyday vehicle use, but a few turbo diesels and some climate-oriented trims of the range also use the air-to-liquid layout due to its ability to maintain coolness. Whatever kind it is, the Intercooler is mounted subsequent to the final compression; therefore, all pounds of boost have the advantage of lower temperature. This easy but good strategy allows Volvo S40 drivers to have better acceleration, better fuel consumption, and reduced emissions without the need to increase the size of the engine.
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