The function of a cylinder bore is fairly simple yet quite demanding. The bore is nothing more than a cylindrical void which contains the engine's air/fuel mixture as it undergoes compression and combustion. The walls of the cylinder have to be strong enough and rigid enough to withstand high combustion pressures and temperatures (600 to 1,000 psi and 3,500 degrees F for gasoline engines, and up to 2,500 psi and 4,500 degrees F for diesels!). The cylinder bore also has to provide a wear-resistant bearing surface to support the piston and rings, and retain enough oil to keep the rings lubricated.
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