31. $200 for piston rings and main bearings. 32. Perfect Circle makes piston and piston rings . 33. Since then, Federal-Mogul has made acquisitions that complement its production of piston rings , engine bearings and seals. 34. Piston rings are a major factor in identifying if an engine is two stroke or four stroke.35. The overhead valves are driven by a gear driven camshaft . Each piston has five piston rings . 36. The intake ports are small enough to ensure that piston rings do not need to be pegged. 37. Sealed Power Corp . developed special chrome-plated piston rings for the engine that were blunted to prevent scuffing. 38. India Piston was established in 1949 . This company produces pistons, piston rings , piston pins and cylinder liners. 39. During use, the cylinder is subject to wear from the rubbing action of the piston rings and piston skirt. 40. The gap in the piston ring compresses to a few thousandths of an inch when inside the cylinder bore.
