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Det/pinking
Ever wondered whats meant by pinking?
Basically its referred to as detonation,meaning the fuel and air(mixture)that is inside the cylinders ready to be burt via the spark plug(timed) is actually igniting on its own(un-timed)from hot-spots in the cylinder.
This can be caused by numerous things like wrong grade of spark plug,wrong grade of fuel,weak air/fuel ratio,high compression etc etc
Heres a picture of what it does to the engine in a mild form
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