How does compression work?

Answer 1

Allmost just like the turbo the difference is that the compresser is driven by a belt this means that the compresser uses power from the engine to work. The compresser consists (easy explained) by two turbins, turbine nr 1 in driven by a belt when the engine is on turbine nr 1 starts to spin because turbine nr 2 is connected to turbine nr 1 it also starts to spinn, when turbine nr 2 is spinning it sucks in air from the athmosphere and pushes it in to the engine this gives the engine an overflow of air to compensate this the engine is given more fuel more fuel+air= more power. Why use a compresser? A compresser is on all the time the engine is on this results in a powergain all the time the engine is on The turbo only works at pregiven rpm this results in a powergain only when the engine revs at the choosen rpm

Sorry for the bad english, i live in sweden.

Hope that answers your question

Answer 2

Compression has 2 major effects:

The piston at the top of the stroke has a certain volume above it.( valve reliefs in the piston face, gasket volume and combustion chamber). When the intake opens and the piston moves down, a engine with higher compression will draw a greater vacuum (with same cam) and fill more effiecient.

When the vavle closes and the piston starts to move back up the cylinder, an engine with higher compression, packs more air/fuel mixture into a tighter space to ignite. That mixture will burn faster, with a higher pressure, producing more power for the same displacement(if knock is not present).