hope this helps...... Detonation/pinging creates extremely violent combustion shock loadings, as the actual combustion process is completely transformed in nature from normal combustion. The easiest way to explain the differences between "normal combustion" and "detonation combustion" is to imagine a small amount of petrol is poured along a flat surface, and then lit. When it is ignited the flame runs along the line of poured fuel, gradually lighting it all along the way. This is how "normal combustion" takes place in the engine. The air/fuel mix is ignited by the ignition source and the resultant flame propagates across the combustion chamber, consuming most of the fuel/air mix along the way. Combustion pressure pushes the piston in a downward motion and this vertical movement is turned into rotating motion by the conrod and crankshaft. By comparison, "detonation combustion" is like an instantaneous explosion in the combustion chamber, rather than a controlled burn that builds cylinder pressure gradually. The explosion is like dynamite going off in the cylinder, with huge cylinder pressures blasting out in all directions at once. Everything in the combustion chamber is smashed into by this force, cracking pistons, hammering the piston rings, shattering spark plugs and, in the case of XR6-Turbos, bending/breaking the conrods.