NRS 2mm 2-Piece Ceramic Apex Seal Kit — Mazda RX-7 Rotary Engine Performance Seal
The NRS 2mm 2-Piece Ceramic Apex Seal Kit are high-performance replacement apex seals for the Mazda RX-7 rotary engine, providing ceramic material technology for competition builds demanding improved temperature resistance and reduced friction compared to cast iron OEM seals. Apex seals are among the most critical components in the Wankel rotary engine — they are the primary sealing elements that maintain the compression pressure in each of the three working chambers formed between the rotor faces and the epitrochoid rotor housing.
What Are Apex Seals and Why Do They Wear?
Each rotor in a Mazda 13B carries three apex seals — one at each corner of the triangular rotor — that slide against the rotor housing’s inner surface as the rotor orbits. These seals maintain the gas-tight separation between adjacent combustion chambers across a continuously moving contact line, which is fundamentally different from the relatively static contact of a piston ring against a cylinder wall. The result is an apex seal contact dynamic that places high demands on seal material hardness, thermal resistance, and lubrication — making seal choice critical to compression retention and engine longevity.
Ceramic Apex Seal Advantages
Ceramic apex seals provide lower coefficient of friction against the rotor housing surface, higher hardness (reducing wear rate at high engine speeds), improved temperature resistance compared to cast iron (maintaining correct clearances at extreme operating temperatures), and lower mass (reducing the centrifugal force the seal spring must overcome to maintain contact at high RPM). For competition builds where the engine is operated at sustained high RPM for extended periods, ceramic seals provide a measurable advantage in seal durability and compression retention.
Rotary Engine Rebuild Expertise
Arctic Performance Parts, part of Wankel Service AS, supplies apex seals and rotary engine components based on direct experience rebuilding and tuning Mazda rotary engines since 2003. We can advise on the correct seal specification for your specific engine build.
Quality and Availability at Arctic Performance Parts
Arctic Performance Parts is the Norwegian-based specialist for Nuke Performance products, serving motorsport builders and performance enthusiasts across Norway, Sweden, and Denmark. Founded from Wankel Service AS — where the owner has rebuilt and tuned rotary and performance engines since 2003 — Arctic Performance Parts brings over 23 years of hands-on engineering experience to every product recommendation. Most Nuke Performance items are stocked for prompt despatch, with a supplier lead time of 1–2 weeks for extended quantities.
