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4d EG manual rack/trans low n slow
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Hey mod, I believe this is a bot replying...
1. The crankshaft rotates, the piston moves from the top dead center to the bottom dead center, and the intake valve is opened at this time. Due to the downward movement of the piston, the volume above the piston increases, generating vacuum suction, and the fuel and air are atomized and mixed into a combustible mixture by the carburetor, which is sucked into the cylinder through the intake valve. After the piston reaches bottom dead center, the intake valve closes and the intake stroke ends.
2. Compression stroke At the end of the intake stroke, the intake and exhaust valves are closed. The piston moves from the bottom dead center to the top dead center, so that the combustible gas mixture entering the cylinder is compressed. When the piston reaches the top dead center, the pressure of the gas mixture can reach more than 1470kPa, and the temperature can reach 250℃-300℃. Combustion work creates good conditions. This stroke ends when the piston reaches top dead center.
3. Power stroke When the piston in the compression stroke is close to the top dead center, an electric spark is generated between the electrodes of the spark plug, which will ignite the compressed combustible mixture, and the combusted gas expands rapidly, so that the instantaneous pressure in the cylinder reaches 2940kPa-4410kPa, and the temperature reaches 2940kPa-4410kPa. At 1800℃-2000℃, under the action of high-pressure gas, the piston is forced to move from top dead center to bottom dead center, and through connecting rod, the thrust of high-pressure gas is transmitted to the crankshaft to make it rotate to perform work, realizing the conversion of thermal energy into mechanical energy.
4. At the end of the exhaust stroke, when the piston is pushed close to the bottom dead center, the exhaust valve opens, and the piston moves from the bottom dead center to the top dead center. The valve exits the cylinder, and when the piston reaches top dead center, the exhaust valve closes and the stroke ends. At the end of the exhaust stroke, a work cycle is completed. As long as the crankshaft rotates continuously, intake, compression, work, and exhaust can be cycled over and over again.
 
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