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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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Notably, the Subaru brand has been a prominent proponent of the flat four engine. Their iconic models, such as the Subaru Impreza and Subaru Outback, have showcased the engine's performance, particularly in all-wheel-drive systems that benefit from the engine's low center of gravity. This synergy between the engine and the drivetrain enhances the vehicle's grip and stability on various terrains, making Subaru a favorite among off-road enthusiasts and everyday drivers alike.


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