Seetz, I don't think water leakage into a cylinder would lead to detonation or pre-ignition. Water injection has been used routinely to suppress detonation by reducing combustion temperature. Depending on where it is injected, it can also cool the intake charge, making it more dense. Alcohol can be added to the water to prevent freezing when that is a possibility. Charge-air coolers are the current technology for reducing intake charge temperature, and so reducing combustion temperature. And that also increases power. Water/alcohol injection was used on some production turbo-charged automotive engines in the past, but drivers would forget to refill the resevoir, and get into your situation. It was called Anti-detonation Injection Fluid. Water/alcohol injection was also used in piston-engine airplane engines for extra power- combat power, it was called, but operation under that condition was limited to a few seconds at a time, lest you lose all power at a bad time. It was also used to increase take-off power. Since you asked...
Harvester
