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The Boost Cooler injection works in three ways. Firstly, when the water is injected into the intake system prior to the cylinder head, the small droplets absorb heat from the intake air.
Water has a very high specific heat rating (it can absorb lots of energy while only slowly increasing in temperature) and so the intake air is initially cooled.
Next, the small drops of water start to evaporate. - Water has a very high latent heat of evaporation and so the intake air charge is cooled still further (up to 60°C!). Finally, when the remaining water droplets and water vapour reach the combustion chamber, steam is produced. This acts as an anti-detonant and also keeps the interior of the engine very clean, so preventing the build-up of carbon "hot spots". |
Water injection is a technology that is nearly as old as the car itself. Water resp. Water/Alcohol will be inject into the intake before the throttle plate with high pressure.
