21. This produces huge amounts of wear in piston rings and god-alone-only-knows how much additional wear. 22. Today, according to Rao, the company exports piston rings to countries like Singapore and Malaysia. 23. Cofap, the world's third-largest piston ring maker, rose 22 percent in the past two sessions. 24. The break-in period required has changed over the years with improved piston ring materials and designs. 25. Piston ring flutter occurs when the rings oscillate vertically within the piston grooves they reside in.26. "' Obturator rings "'are a specific type of piston ring used in World War I cylinders. 27. Aluminum cylinder bore engine piston rings break-in faster than those used on cast iron cylinder bores. 28. The goal of modern engine break-ins is the settling of piston rings into an engine's cylinder wall. 29. The following morning, it was discovered that four of the engine's cylinders also had cracked piston rings . 30. :Have you read the piston ring article?
