Quote
Knock occurs when cylinder pressures are high. It is normal for an engine to ping a little at full throttle
because cylinder pressures are very high at full throttle. Engine knock, however, should not be ignored
since it can result in serious damage to the engine.
ò High octane gasoline burns slower than low octane gasoline. The slow burn prevents engine knock when
cylinder pressures are high.


First one. Cylinder pressures are very high at the torque peak at full throttle, not necessarily at any full throttle rpm.

Second one. Preemo is harder to ignite, not slower to burn.

Not responsible for advice not taken...