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A connecting rod, also called a 'con rod', [1] [2] [3] is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the crankshaft. [4] The connecting rod is required to transmit the compressive and tensile forces from ...
For the 1999 model year all pistons were totally redesigned. Both engines used the flat top pistons with 2 valve recesses and featured a new hypereutectic design with coated skirts. Also for 1999 all connecting rods switched to a slightly longer powder forged design and cracked bearing caps. The piston pins floated in the connecting rod bushings.
Connecting rods do not have bronze bushings where the piston wrist pin goes thru the connecting rod. This also allows for excessive wear and noise on higher-mileage vehicles. If aftermarket tuning is installed that introduces too much advanced fuel injection timing, cracking of the cylinder heads can result due to excessive combustion temperatures.
Where the connecting rods are at different locations along the crankshaft (which is the case unless fork-and-blade connecting rods are used), this offset creates a rocking couple within the engine. V4 engines come in many different configurations in terms of the 'V' angle and crankshaft configurations.
The crankshaft and connecting-rod big-end bearings in current automobile engines are made of a replaceable steel shell, keyed to the bearing caps. The inner surface of the steel shell is plated with a coating of bronze , which is in turn coated with a thin layer of Babbitt metal as the bearing surface.
The crankpin connects to the larger end of the connecting rod for each cylinder. This end of the connecting rod is called the "big end", as opposed to the "small end" or "little end" (which connects to the wrist/gudgeon pin in the piston). The bearing which allows the crankpin to rotate around its shaft is called the "rod bearing". [5]
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