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More oxygen in a car, combined with extra heat from burning more oxygen may trigger pre-ignition or uncontrolled explosions in the cylinder. One of the counter measures is the reduce the Compression Ratio (CR). Where some naturally aspirated engines may have a CR of up to 12.5 : 1, boosted engines tend to lower the CR to 8.5:1 . To lower compressions various things can be done, e.g. using shorter piston rods, thinkers pistons, thicker head gaskets.

The head of an engine, where the valves and camshafts are located in many engines, may also be altered to gain flow compared to the stock engine. This will improve the volumetric efficiency of a car and reduce backpressure, basically make the engine a better airpump.
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Mobic Billig

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