Complex sentence: The biggest drawback of piston Silicon is that the piston becomes more brittle as more Silicon is added, which allows the piston to develop cracks easier if the engine experiences pre-ignition or detonation.
Split into simpler sentences: The biggest drawback of adding silicon to pistons is that the piston becomes more brittle as the ratio of silicon is added. This makes the piston more susceptible to cracking if the engine experiences pre-ignition or detonation.