How to order the right piston rings?

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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If the rings will squeeze up to fit in a 3 1/4" diameter bore size then they are 3 1/4" x 1/4" rings. If they will only squeeze up to fit in a 3 1/2" diameter bore size then they are 3 1/2" x 1/4" rings. It is easy to grab the wrong size ring when trying to meet a shipping deadline to fill an order. I did it myself one day last week. Thank goodness it doesn't happen very often. If they are truly the 3 1/2" x 1/4" I will exchange them for the 3 1/4" x 1/4" if you send them to me. Otherwise the 3 1/2" x 1/4" is the fastest moving ring size for old engines. Fits 1 1/2 HP John Deere, 1 1/2 HP Fairbanks Morse, 1 1/2/2 HP Waterloo Boy, 1 1/2 NC Fuller & Johnson, 2 HP K Stover, also some of Emerson Brantingham, Gray, Brownwall, Sattley, and others. You might want to keep the 3 1/2" rings for another project and call Hit n Miss for another set of the 3 1/4" x 1/4" rings. About the Raleigh rings..... if the bore diameter is 3 1/2" and you ordered 3 1/4" x 3/16" then you are in trouble. You can only put 3 1/2" rings in a 3 1/2" bore and have it work right. Peter and Vernon are telling you right about measuring for rings. If your bore diameter is 3 1/2" and the grooves are 3/16" wide then you must use 3 1/2" x 3/16" rings.
Thanks,
Dave Reed
Otto Gas Engine Works
Blue Ball Road
Elkton MD - USA
410-398-
http://www.pistonrings.net, http://www.ringspacer.com

Hi Loren-If the rings will squeeze up to fit in a 3 1/4" diameter bore size then they are 3 1/4" x 1/4" rings. If they will only squeeze up to fit in a 3 1/2" diameter bore size then they are 3 1/2" x 1/4" rings. It is easy to grab the wrong size ring when trying to meet a shipping deadline to fill an order. I did it myself one day last week.Thank goodness it doesn't happen very often. If they are truly the 3 1/2" x 1/4" I will exchange them for the 3 1/4" x 1/4" if you send them to me. Otherwise the 3 1/2" x 1/4" is the fastest moving ring size for old engines. Fits 1 1/2 HP John Deere, 1 1/2 HP Fairbanks Morse, 1 1/2/2 HP Waterloo Boy, 1 1/2 NC Fuller & Johnson, 2 HP K Stover, also some of Emerson Brantingham, Gray, Brownwall, Sattley, and others. You might want to keep the 3 1/2" rings for another project and call Hit n Miss for another set of the 3 1/4" x 1/4" rings.About the Raleigh rings..... if the bore diameter is 3 1/2" and you ordered 3 1/4" x 3/16" then you are in trouble. You can only put 3 1/2" rings in a 3 1/2" bore and have it work right. Peter and Vernon are telling you right about measuring for rings. If your bore diameter is 3 1/2" and the grooves are 3/16" wide then you must use 3 1/2" x 3/16" rings.Thanks,Dave ReedOtto Gas Engine Works Blue Ball RoadElkton MD - USAphone 410-398- http://www.ringspacers.com

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