[boxermania]

Didn't have any success with that; as soon as I go more than 5deg BTDC, it didn't run well.

Gunter

In your last post I think that you have confused initial advance and total advance.

Initial advance is when you time the engine at idle.....basically the engine is turning very slow and you are firing the plugs at a crank rotation that will generally be conducive to a smooth running engine.

Total advance is the initial plus the distributor advance. Inside the distributor, there is a cam with weights that will advance the timing as the RPM increase, via centrifugal force. The reason for this is that as the engine RPM increase so do the opening and closing of the valves and the filling and emptying of the cylinders. The advance is necessary to keep the timing, firing of the plugs, in sync with these events and insure that the engine will run well and produce the designed hp.

So the firing of the plugs will have to change to continue to take advantage of the engine power.......too much advance leads to detonation, too little advance results in loss of power.