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What is the turbo cooler for?

Updated: 10/25/2022
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14y ago

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There are technically two types of "turbo coolers".

1. A radiator device to reduce the temperature of the compressed intake air after it's left the Turbo housing and before it reaches the engine. This is an Intercooler. Air heats up when compressed (look up the Ideal Gas Law) but cool air is denser thus carries more oxygen per unit volume. Since the fuel air mixture for combustion is tied to oxygen availability more oxygen per unit volume is desired. The Intercooler reduces the intake air temperature thus boosting combustion efficiency and reducing side effects like pre-ignition.

2. An automatic device to shut the turbocharged engine off after it has idled for several minutes. This allows the turbo housing to slowly drop in temperature from an active state to the lowest running state prior to shutdown. These devices are simply called a "turbo timer". Allowing the turbo to cool slowly extends the life of the turbo by reducing thermal stress. With some turbocharged engines such as in light aircraft this idle cooldown is mandatory.

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