I want to learn something, when you say smaller chambers, good quench means less total timing.......does this equate to less power?? I would like to know......
Mad, when you build with quench in mind, and set it properly, the motion of the piston forces the mixture towards the spark plug as the piston reaches top dead center. That both keeps the mixture the best it can be (so the fuel doesnt seperate out causing detonation prone spots) and also gets it in a smaller volume. That way when it fires, less ignition lead is needed to have the highest pressure on the piston around 17° After TDC on the power stroke.
Think of timing a black powder explosion to go off just as someone's foot is on it. If you have the powder spread out flat on the ground, you light the edge and it burns accross it fairly slowly with a "whoosh" sound to it. If you have a firecracker where it's all in a small spot and held there, it fires very quickly with a loud "pop". Same thing with the air/fuel mix and the ignition timing. If it has to burn over a dome, or accross a large open chamber, there is more chance of wet fuel burning irregularly causing detonation, than is the air and fuel stay well mixed and the area is less than 1/2 the open chamber's volume.
