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Describe difference between water-cooled turbocharger, air-air turbo intercooler, water-air turbo intercooler?

  • The new Porsche 911 Turbo has a "water-cooled turbocharger" (http://www.porsche.com). Does this mean it employs a water-to-air intercooler (really an aftercooler) on that ...show more

  • Answer:

    I don't know enough about the history of porches to speak knowledgably on that aspect, however i can tell you that a water cooled turbo charger is different from an air or water intercooler. An intercooler is designed to cool the air going into the engine. When air is compressed by a super charger, or a turbo charger, the forces that were placed on the air cause it to heat up. As most people who are in the business of making power know, hot air is bad and cool air is good. So an intercooler gets the air to be nice and cool. An air, water or oil cooled turbocharger refers to the method by which the actual turbocharger is being cooled. Because they spin at such high RPM's they generate incredible heat. Most turbo's are oil cooled which is why you are suppose to idle the car for a minute before turning it off after use. If you turn off the engine right away, the oil is no longer pumped into the turbo and you can burn up your bearings. So water cooled is just a different method of cooling off the actual turbocharger. I believe it works alot like the system to cool your eninge.

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You are talking about two different parts of the system. Water cooling a turbocharger keeps the turbocharger cool and prevent the bearings from getting too hot. Normally turbochargers are feed oil and the oil cools and lubes the bearing. Intercooler or aftercoolers cool the air charge that is entering the engine. This is done to reduce the point of detention in the combustion chamber. It and be air to air meaning that the cooler has the air charge running through a device that has air running over the outer surface to cool the air charge before the air charge enters the chamber. Air to water coolers use a coolant that circulates and pull heat out of the air charge and then passes the heat out the cars engine cooling system or it may have a separate radiator that only deals with the air charge heat. Both the air to air and the air to water allows the air charge to be denser which makes more horsepower.

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