![]() ![]() The CP-20 oil ring assemblies feature a 20 degree ear angle, an exclusive feature that provides the best possible side seal against the cylinder wall, and a special chemical polish on the oil ring expander offers enhanced oil drainback. #Pre gapped piston rings manualIf you’re only going to build one or two engines, it’s hard to justify the USD300-400 expense of an electric ring file, as a USD40-80 manual ring file can still do a perfectly-good job if used carefully. Intermediate rings have a reverse twist design for better groove side sealing, and taper race machining to enhance contact. Adjusting your ring end gaps is done with a piston ring file and there are two options when it comes to this manual or electric. The compression rings feature a barrel-faced contact area for more efficient compression and CNC-controlled gap chamfer to optimize compression and reduce blowby. That is a huge difference in the gap as compared to the production ring package. Piston rings are available both ways, pre-gapped and not, but regardless, piston rings gap should AWAYS be checked for correct end gap clearance to specs. ![]() Multiplying 3.898 x 0.004-inch results in a minimum top-ring endgap of 0.01559 or 0.016-inch. Remove the material quickly, will keep you from getting too large a gap. According to Wiseco, for a normally aspirated street engine, it recommends 0.004-inch per inch of bore size. 143, Mahle Original piston ring sets are designed to be installer-friendly. 136, Oil control ring height 3.0mm, radial width. 151, Second ring height 1.5mm, radial width. #Pre gapped piston rings professionalFirst introduced in 1956 and still widely preferred by professional engine builders. MAHLE PREMIUM PISTON RING SET - 1999-2013 4.8/5.3 LS ENGINES - 3.780' BORE - 41859CP, PLEASE MEASURE YOUR OLD RINGS BEFORE PURCHASE Top ring height 1.5mm, radial width. Whats in the box: 1x Piston Ring End-Gap Filer Tool w/ Accessories. Featuring the famous Flex-Vent 3-piece oil control ring. The main reason for stock piston failures isnt so much the ring gap or rings themselves but the design of the piston. Ring materials and coatings, as well as ring tension, are all optimized for reduced friction and extended life in each application. Exclusive filer assures proper piston ring end-gap precisely. They are pre-lapped to seat immediately, virtually eliminating break-in time. ![]() Mahle Original piston ring sets are designed to be installer-friendly. Oil control ring height 2.0mm, radial width. PLEASE MEASURE YOUR OLD RINGS BEFORE PURCHASE! ![]()
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