Traditional piston ring sizing has been in fractional inch measurements. You&#;ll typically find top and 2nd rings in 5/64-inch, 1/16-inch, or .043-inch sizes, with oil rings typically in the 3/16-inch size. Modern engines moved to metric ring measurements of 1.5mm to 1.0mm for top and second rings with 3.0 to 2.0mm oil rings. These ring thicknesses have been the norm for decades, but moving to a thinner ring package has shown several advantages. With custom pistons, you&#;ll find types of piston rings as thin as .5mm (.020 inch). The thinner rings provide some great benefits, including increased horsepower and torque while reducing weight and compression height. Significant power gains can be had from utilizing thinner, modern rings and piston designs. While it has been more critical to use the proper piston ring installation pliers on thicker rings, we highly recommend that you use the same tool on thinner rings as well. The only types of piston rings that are OK to be &#;spiraled&#; onto the piston are the oil ring&#;s top and bottom rails. Never spiral the compression rings onto a piston.
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Originally Posted by R 70 Judge
Who makes the best piston ring set under $400? I personally am leaning toward the Childs & Albert ZGS (zero gap second) ring set. My engine builder has used them many times in the past with excellent results. (Mostly SBC & BBC engines)IA2 Block / 4.35 Bore / Ross Custom dishI received a set of Total Seal rings (CR 35)with my rotating assembly but it is not a true gapless ring so I'm switching to something different.Anyone have experience with the C&A ZGS ring set, or want to recommmend another high quality gapless ring set?
Goto Dongya to know more.
I know it's not one of the choices, my pick is Speed Pro file fit rings. They are inexpensive compared to zero gaps and perform as well or better in every case I've encountered. Hastings is another popular choice in the shop where I work. Alcohol and supercharged applications have different requirements than naturally asperated. Those applications the zero gap has merit.
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