Compression rings are available in many types of design- plain, tapered on periphery, stepped internally, ridge dodger etc. You will be supplied with what is available for your chosen diameter and width unless you include details of a more specific requirement. Oil ring types also vary, through the two main varieties are one piece and three piece - either may be supplied unless you specify otherwise. Piston ring joints also vary and you will be supplied with what is available for your diameter and width selection unless you include details of a specific requirement. Please note that including specific requirements beyond diameter and width may limit our ability to supply the rings you require.
Ring diameter – The outside diameter of the piston ring
Using the drop down menu, enter either an imperial ring diameter plus an oversize, or an absolute metric diameter including the over size (Oversizes - 0.010” = 0.25mm, 0.020” = 0.5mm, 0.030” = 0.75mm, 0.040” = 1mm, 0.050” = 1.25mm, 0.060” = 1.5mm, 0.070” = 1.75mm, 0.080” = 2mm, 0.090” = 2.25mm). Where you specify an imperial diameter with an oversize, we will select that ring where available. Where it is not, we will supply the next largest metric size e.g. a 3 ½” diameter ring +030” over size is 89.66mm diameter. If this exact size of imperial ring is not available, you will be supplied with a 89.75mm diameter ring unless you specify that is not acceptable.
Ring Width – The ‘height’ of the piston ring
Using the drop down menus, enter either an imperial or metric ring width. We will only supply rings of the exact width you request, unless you specify you will accept the nearest smaller imperial or metric size.
Maximum Radial Thickness – The radial thickness of the piston ring
This requirement is determined by the depth of the ring groove in the piston relative to the engine bore size. Please note that you will be supplied with a ring that matches only your chosen ring diameter and width - unless you specify a maximum radial thickness and a tolerance in the selection process. Again, please note that including a specific radial thickness dimension may limit our ability to supply the rings you require.
Piston rings are made from a range of materials, though cast iron is used predominantly due to its inherent wear resistance and strength. Some piston rings are chrome plated on the periphery and/or on one/both side faces to lengthen ring and groove life. The steel rails of Apex and Duaflex Oil Control rings are chromium plated on their fully radiused edges. Please note that CHROMIUM PLATED RINGS MUST NOT BE FITTED IN CHROMIUM PLATED BORES. If you have a chrome plated bore, please indicate this in the selection process, so cast iron (or other suitable material) piston rings are selected for your order.