What’s a piston rod?

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A connecting rod connects the piston to the crankshaft in an engine, transmitting power from the controlled explosion to the crankshaft. Car engines have one rod per cylinder, with four valves per cylinder in most front-wheel drive overhead cam engines. All four-stroke internal combustion engines have four strokes: intake, compression, combustion, and exhaust.

A connecting rod, better known as a connecting rod, connects the piston to the crankshaft in an engine. The piston rod allows power to be transmitted from a controlled explosion in the cylinder to the crankshaft, and to the pushrods and lifters, depending on whether the engine has an overhead camshaft or a standard overhead camshaft. There is one rod per cylinder in internal combustion engines.

In a car engine, each cylinder has a piston and two or more intake and exhaust valves. Most front-wheel drive overhead cam engines have four valves per cylinder: two intake valves and two exhaust valves. Engines with the camshaft in the middle of the engine generally have two valves per cylinder: an exhaust valve and an intake valve. All four-stroke internal combustion engines, regardless of camshaft type, have four strokes: intake, compression, combustion, and exhaust.

On the intake stroke, the crankshaft pulls the piston rod down. This pulls the piston down and allows a mixture of air and fuel to enter each cylinder. The intake valves in each cylinder are open, allowing air and fuel to enter the cylinder.

As the crankshaft pushes the piston rod up on the second stroke, the compression stroke, the intake valves begin to close and the fuel-air mixture is compressed. Compression heats the mixture and makes it more volatile. By the end of the race, the intake valves have fully closed and the exhaust valves are preparing to open.

The crankshaft starts to go down again for the combustion stroke, which is the third stroke. The exhaust valves begin to open. The spark plug fires the volatile air-fuel mixture, triggering a controlled explosion and creating energy. As the piston rod moves through the stroke, the exhaust valves open further.

On the fourth stroke, the exhaust stroke, the exhaust valves are fully open and the crankshaft begins to push the stem up, expelling burned air and fuel into the exhaust system. The exhaust valves are starting to close near the end of the stroke, and the intake valves are getting ready to open. At the end of the stroke, the exhaust valves are completely closed, and the piston rod has pushed the piston all the way to the top of the cylinder. Excess fuel-air mixture is fully expelled into the exhaust system, then the process starts all over again.

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