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Inside the engine you have pistons attached to rods that are attached with bearings to the crankshaft. The crankshaft has offset points where the rods attach. The pistons are housed in cylinders and on top of the cylinder you have what is called a head. Inside the head are valves that let a fuel and air mixture into the cylinder. The valves are operated by the camshaft which is somehow geared to the crankshaft. As the piston moves up in the cylinder during the compression stroke, the fuel/air is compressed and a spark then ignites the mixture driving the piston down which turns the crankshaft causing one of the other pistons to go up compressing the gas in that cylinder. When this explosion occurs, the piston gets slammed down. That is the power stroke. That causes the crankshaft to turn, sending power to the transmission which in turn allows the car to move. Then the piston returns because of the momentum of the flywheel and the force of the other pistons if there are any. At the same time, a valve opens allowing the burned fuel air mixture to leave the cylinder and flow through the muffler and out the tailpipe. That is the exhaust stroke. Then the exhaust valve closes as the intake valve opens, allowing new fuel mixture to get sucked in during the intake stroke. Then the compression stroke outlined above repeats the entire cycle.

That is pretty basic but it should give you an idea of how it all works. Below are some of the common variations of this.

A diesel engine works similarly, but the detonation is caused by compression rather than ignition. Instead of spark plugs, it is the pressure inside the cylinder which causes the fuel mixture to explode. Fuel injection is required to get the amount of pressure necessary for detonation to occur. Glow plugs are only needed to warm the engine for starting, and a larger starter, battery, and alternator may be required. The cylinder walls might also be thicker. Otherwise the process works pretty much the same as for a 4-stroke gasoline engine.

Then there is the rare Wankel engine that Mazda once used. It contains one or more rotors that have 3 surfaces. There is a rod called an eccentric that functions similarly to the valves of a 4-stroke reciprocating engine. However, a rotary engine is technically a 2-stroke engine since every rotor surface fires once per revolution of the crankshaft, while in a 4-stroke reciprocating engine, the cylinder only fires every other rotation. Anyway, the spark plugs fire and the explosion causes the rotor to rotate, sending the power to the transmission and wheels. Then as the rotor turns the eccentric opens the exhaust port to let the exhaust out and opens the intake port to allow new fuel mixture inside, readying the rotor to fire again once that same surface reaches the same location. The other surfaces fire while the first surface is readied to fire again.

In 2-stroke engines such as in some motorcycles and yard equipment, the pistons also double as valves and both sides of the pistons are involved. So that means that the fuel requires a lubricant to be added since the fuel passes through the crankcase. While the piston is in the power stroke, new fuel air mixture is sucked into the crankcase for the next power stroke. Then ignition occurs, the piston is forced down as part of the power stroke and then the exhaust and intake ports are cleared. As the downward stroke forces new fuel-air-lubricant mixture into the cylinder, the exhaust is cleared, and the piston is again in the compression stroke.

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7y ago
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14y ago

The solenoid activates the contact when the ignition key is on which inturn turn the engine then starts the engine.

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