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Mounted atop the engine block, the cylinder head contains the intake and exhaust valves. Its primary function is to seal the upper end of the cylinders. The cylinder head also houses the combustion chamber where the fuel-air mixture ignites, producing the power needed to drive the vehicle. Furthermore, the cylinder head contains spark plugs that ignite the air-fuel mixture in gasoline engines, or the injectors in diesel engines.


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Compression testing measures the ability of an engine to compress its air-fuel mixture properly. This compression is crucial for the engine to operate efficiently and effectively. When you pull the starter rope on a small engine, the piston moves down the cylinder, allowing air and fuel to enter the combustion chamber. As the piston moves back up, it compresses this mixture. The higher the compression, the more power the engine can produce.


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In countries like China, which leads the world in EV production, government incentives have spurred the development and adoption of new Chinese EV models. This has accelerated the shift toward electric vehicles and contributed to lower costs as manufacturers scale up production. The Chinese government has also invested heavily in infrastructure, creating an ecosystem where new energy electric cars are more affordable and convenient to use.

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