Junk. Not ALWAYS true that an increase in compression ratio will increase power. You get to a point where you have a maximum, and then it starts to drop off rather rapidly as you get problems with detonation. This is where the compression of the fuel/air mixture causes the mixture to explode, prior to the spark that's meant to ignite it at exactly the right time.
This gives several problems. Firstly it means that some of the power generated is actually working against you, pushing against the cylinder before it reaches the top of it's travel (TDC). Secondly when detonation occurs you have an explosion, rather than the controlled burn that you normally expect. In a normal cycle, the rate of flame propogation is much slower than that which occurs during a detonation. This means that when a detonation occurs all of the energy hits the piston in a big lump, often with disasterous results. I've lost count of the number of con-rods I've seen snapped clean in half due to detonation. And even in it's mildest form it makes for a hugely rough running engine.