![]() ![]() Your vehicle may have a single or dual exhaust system. Upgrade Exhaust System – Find a Meineke Shop Near You Single and Dual Exhausts This is the exhaust stroke – the leftover gas and air are forced out of the cylinder through the exhaust valves, into the exhaust manifold and out through the exhaust system. This leftover mixture must make its way out of the engine to make room for a new wave to start. However, not all of the fuel and air is used. The spark plug fires and causes an explosion in the cylinder (combustion). Once the air and fuel are pulled into the engine (intake), the piston comes up to compress the mixture to make it more volatile (compression). An engine like the one in your car has four stroke: Intake, compression, combustion and exhaust. This means that your engine, which is like a huge vacuum pump, sucks in air and fuel.
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