Posted by Owen Aaland on September 19, 2010 at 19:57:59 from (207.13.114.85):
In Reply to: piston rings 4 or 5??? posted by truckinthumbtack on September 18, 2010 at 21:44:58:
Having five rings on a piston was quite common. Usually there were three compression rings and two oil control rings. One oil control ring above the wrist pin and one below. As piston ring quality became better it was possible to maintain the same sealing ability with less rings. Each ring creates drag on the sleeve and piston so fewer rings means more horsepower available at the flywheel. The more rings on a piston the more wear there will be on the cylinder bore. Engines like the 3208 Cat only use two rings per piston but three per piston is much more common.
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