![]() As the piston nears the top of its stroke, a spark jumps the gap in the spark plug and auto ignites the compressed charge. The power stroke is the one that moves the car. The piston thus forces the air/fuel mixture up into the combustion chamber, compressing the mixture to something like 150 pounds per square inch (psi). The compression stroke begins with the piston reversing and moving upward, with the intake and exhaust valves closed. I hope this guide and brief article will help you know how to improve compression ratio and power of a car and auto engine. ![]() To Increase Compression Ratio, you should understand car features and also how the different parts acts for powering up the engine. Outside air pressure forces air/fuel mixture and injection in through the open intake valve. As the piston moves downward, it creates low pressure, or partial vacuum, in the cylinder. The intake stroke of the engine begins with the piston at the top of its travel.
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