Goopy Performance 13B 2mm Apex Seal Set
Goopy Performance 13B 2mm Apex Seal Set
Goopy Performance 2mm apex seals are a proven performance upgrade for compatible Mazda 13B rotary engines using 2mm apex-seal rotors.
Designed with strength and longevity in mind, Goopy apex seals are manufactured in the USA from the company's proprietary Goopy-Alloy and are suitable for applications ranging from standard engine rebuilds to high-performance turbocharged rotary builds.
The 2mm version is designed for compatible Mazda 13B rotors using the factory-style 2mm apex-seal slot.
KEY FEATURES
- Genuine Goopy Performance apex seals
- Complete set of 6 seals
- 2mm specification
- Designed for compatible Mazda 13B
- Made in the USA
- Designed for strength and longevity
APPLICATION
Suitable for compatible Mazda 13B rotary engines using 2mm apex-seal slots, including applicable:
- Mazda RX-7 FC3S
- Mazda RX-7 FD3S
- 13B-T
- 13B-REW
- Naturally aspirated 13B applications using compatible 2mm rotors
- Turbocharged 13B performance builds
- Street, track and motorsport engines
Compatibility must ultimately be determined by the rotor apex-seal slot specification, not vehicle model alone.
APEX SEAL CLEARANCE
Correct apex-seal clearance is critical during rotary engine assembly.
Goopy recommends approximately 0.0015" clearance between the apex seal and rotor slot for both naturally aspirated and boosted applications.
Every rotor and apex-seal groove should be cleaned, inspected and accurately measured before final engine assembly.
Never assume that a used rotor remains within its original factory dimensions.
ENGINE REBUILD INFORMATION
Apex seals are only one part of the complete rotary engine sealing system.
During a 13B engine rebuild, RSG recommends inspecting and measuring:
- Rotor housings
- Rotor apex-seal grooves
- Apex seal springs
- Side seals
- Side seal springs
- Corner seals
- Corner seal springs
- Oil-control rings
- Rotor bearings
- Stationary bearings
- Eccentric shaft
- Engine sealing surfaces
Correct component clearances, engine assembly, lubrication, fuel system, ignition system and ECU calibration are essential to the reliability of any performance rotary engine.
Contact RSG if you are unsure whether Goopy 13B 2mm Apex Seals are appropriate for your build.
Worldwide shipping available.

