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Reducing internal engine friction is Federal-Mogul's goal and, with its CarboGlide piston ring coating, the company seems to have mastered the art of making metal slippery. According to Federal-Mogul, CarboGlide delivers a direct improvement in fuel economy and CO2 emissions by reducing ring friction by up to 20 percent, compared to other commonly used coatings.

While developments like HCCI and EcoMotors OPOC engines get plenty of attention in the drive to increased efficiency, there is still plenty of room for improvement in more traditional engine architectures. Reducing internal friction is a prime target for improvement that is being tackled in several ways, including coats, surface finishes and lubricants.

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