Oversized Bore Diameters Most MaxSil™ Pistons are offered with oversized bore dimensions between .025mm and 1.2mm depending on the application. MaxSil™ Pistons for aluminum BMW V8's are offered in both oversize and standard bore sizes - for use with our Duraliner centrifugally-cast iron cylinder sleeves. See application/price sheet for specific oversize dimensions and Duraliner V8 applications. .002" oversize pins All MaxSil™ Pistons include .002" oversize pins and pin bores. This allows installers to micro hone the rod bushing to size for a precision fit of piston pin to rod bushing. .0015"(+/-.0003") piston to cylinder wall clearance MaxSil™ Pistons for BMWs are manufactured using a special aluminum alloy blend that includes the optimum amount of silicone. This aluminum alloy offers more strength, less weight, less heat expansion, and less friction than other alloys - while avoiding the brittleness of hypereutectic. This allows installers to hold a .0015 (+/-.0003") clearance between piston and cylinder wall without risk of seizure. All MaxSil™ Pistons are precision cast and CNC machined. See the chart below for tolerances of the 33 critical dimensions held during the machining process. All tolerance dimensions are in mm. ITEM SPECIFICATION TOLERANCE 1. Piston Length ±0.10 2. Distance from 1st ring groove (lower) to the bottom of the skirt ±0.20 3. First ring groove width ±0.04 ±0.02 4. First ring groove diameter ±0.10 5. Parallel of first ring groove ±0.06 6. Distance from 2nd ring groove (lower) to the bottom of the skirt ±0.20 7. Second ring groove width ±0.04 ±0.02 8. Second ring groove diameter ±0.10 9. Parallel of second ring groove ±0.06 10. Distance from 3rd ring groove (lower) to the bottom of the skirt ±0.20 11. Third ring groove width ±0.04 ±0.02 12. Third ring groove diameter ±0.10 13. Parallel of third ring groove ±0.06 14. Compression height ±0.10 15. Piston pin dimension -0.002 -0.004 16. Piston pin hole diameter +0.004 +0.000 17. Diverge of the piston pin from the center ±0.10 18. Circlip diameter ±0.10 19. Circlip span ±0.30 ±0.10 20. Circlip width ±0.10 ±0.00 21. Circlip bore diameter at D0 ±0.01 22. Circlip bore diameter at D1 -0.02 -0.04 23. Circlip bore diameter at D2 ±0.01 24. Circlip bore diameter at D3 ±0.01 25. Oval ratio (Piston ring land) ±0.02 26. Oval ratio (Piston skirt) ±0.02 27. Ring land diameter (3) -0.50 -0.54 28. Ring land diameter (2) -0.44 -048 29. Ring land diameter (1) -0.38 -0.42 30. Distance from the bottom of the skirt to the bottom of the combustion chamber ±0.10 31. Distance from the bottom of the skirt to the bottom of the valve ±0.20 32. Distance from the bottom of the skirt to the bottom of the valve (2) ±0.20 33. Thickness of the teflon coating on the skirt ±0.01
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