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The reason for so many failures, is because the community as a whole believes they can run more boost than is safe for the octane of the fuel being used, also because of the huge flood of poor injectors that are being advertized as quality that are not.
The amount of people getting sucked into buying drilled injectors that flow different per cylinder is just sad in my opinion.
Hard detonation can cause catastrophic failure instantly; mild detonation slowly eats the bearings by crushing them and causing them to slowly crumble. This slow eating of the bearings is the most common from running the raggedy edge, or just over the edge.
Most people are running boost levels that are 1 to 2 PSI higher than is safe, or right at the edge with no safety buffer. The one or two PSI over the detonation threshold slowly eats the engine bearings typically over 6 months to a year. The folks running right at the edge can be safe some days and just over on others, this slow eating of the engine can take 2 to 5 years before failure.
The owner believes they are running safely and can not hear the detonation and the engine seems to perform fine, but is slowly being eaten away.
The detonation leads to small pits on the head and piston surfaces, this causes detonation to occur sooner, and at even lower boost pressures because the raised spots heat easier, glow red and ignite the fuel.
What actually is happening when detonation occurs is the piston is being forced down from the fuel firing while the crank is pushing the piston up. It is similar to hitting the piston with a big hammer.
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