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Most factory-stock piston pin designs rely on a pressed fit with the pin being pressed into the connecting rod. High-performance pistons are typically held in place with wire clips or aluminium buttons.
When installing a new piston pin it is imperative that the pin be oiled where it passes through the piston. Failure to adequately lubricate the pin will result in a seized piston nearly every time. The high heat generated by the connecting rod rotating within the piston causes a dry or inadequately lubricated pin to fall into the piston. This will cause the engine to lock up as the piston locks onto the pin. Broken connecting rods and even a broken engine block could also result.
While most stock piston pins are made of hardened steel, many high-performance applications utilize tool steel pins. These tool steel pins are the strongest and most durable available and can withstand ultra-high horsepower. The use of high-quality materials also allows the tool steel piston pins to be made very light weight. This aids in the engine's ability to accelerate at a much faster rate than an equally prepared engine equipped with heavier pins.
While most pistons are sold complete with piston pins included, some of the highest-quality racing pistons are sold without pins. This allows the engine builder to purchase the pin package which best suits the engines build characteristics. Nearly every professional engine builder around the world has a unique manner of assembling engines; most will agree, however, that full-floating pins are the correct call for a serious performance engine assembly.
In a stock engine, the piston pins are lubricated and cooled by oil which is splashed or thrown off of the crankshaft as it spins within the engine block. In most normal driving conditions, this is a successful design. In racing or high-performance applications, the engine builder will often incorporate a system of tubes directed toward the bottom of the pistons. These tubes spray oil directly onto the pins and the pin bosses, maintaining lubrication and cooling efforts. By keeping the piston pins cool, the pistons are able to generate maximum horsepower without heat-related engine failure.