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Most SPEED-PRO rings are available in + .005" oversizes. Professional racers and engine builders know that precisely setting the ring end gaps by "file fitting" is well worth the time and effort.
24 mar 2019 · Basic rule of thumb for n/a engines without nitrous is .0045" to .0050" inch of gap, per inch of bore diameter for the top ring and .0055" to .0060" per inch of bore diameter for the second ring. The second ring gap should always be larger then the top ring gap in order to relieve pressure between the two rings.
4 paź 2020 · File fitting piston ring end gaps is not normally required for regular usage, but is a common procedure in racing applications. Most SPEED-PRO rings are available in +.005" oversizes.
RING END GAP CALCULATOR. Too little ring end gap can result in catastrophic engine damage! Always inspect ring end gap during the assembly process and make any adjustments before final assembly! As a general guideline, ring end gap that is larger than expected is less of an operational concern than too little end gap.
Safe top ring end gaps can be found by multiplying the bore diameter by the appropriate ring end gap factor from the clearance chart below. Example: 4" bore "Street Normally Aspirated" = 4" bore x .0065 = .026 top ring end gap. NOTE: Second ring end gaps do not need extra clearance.
5 lis 2008 · When the SP pistons had longer skirts, you could get away with more clearance. Now that they shortened the skirts, they can get noisy real quick. For ring end gaps, you can run tighter (.016" top, .020" second) with cast, moly-filled stock type replacements (2m129, E251K).
End Gap A common practice in performance applications is file fitting piston end gaps to a precise end gap using slightly oversized rings. Most Performance Ring sets are available in file fit (+.005”) oversizes. The end gap refers to the clearance between the two ends of the piston ring when installed into the cylinder bore.
