Click to zoom in
SKU: PCW-MZD-02 | UPC: 887753965479
Competition Clutch Counterweight for 1986-1988 Mazda RX-7 Turbo w/ Bolts
This Competition Clutch counterweight balances the eccentric shaft in Wankel rotary engines of 1986-1988 Mazda RX-7 Turbo models. It pairs with lightweight or ultra-lightweight flywheels like 2-745-ST or 2-745-STU for reduced vibrations and faster revs. Made from 4140 billet Chromoly steel, it handles high-horsepower street and track use.
Key Features
- Material: 4140 one-piece billet Chromoly steel provides strength and resists wear in forced induction and high-rpm setups.
- Balance Design: Counters eccentric shaft for precise rotation, cutting vibrations and improving power transfer in rotary engines.
- Compatibility: Works with Competition Clutch flywheels 2-745-ST (lightweight) and 2-745-STU (ultra-lightweight) for seamless drivetrain upgrades.
- Weight: 3.67 lbs (1.67 kg) maintains low rotational mass for quicker throttle response.
- Hardware Included: Six M8-1.0 x 20mm bolts ensure secure mounting without extra parts.
Product Notes
- Required when replacing OEM flywheel with Competition Clutch lightweight or ultra-lightweight versions. not for stock flywheels.
- Designed for 1.3L Turbo (13B) rotary engines in FC chassis RX-7 Turbo models.
- 90-day limited warranty covers defects in material and workmanship.
Installation Notes
- Professional installation recommended.
- Remove OEM integrated counterweight during flywheel replacement.
- Uses included M8-1.0 x 20mm bolts. torque to manufacturer specs for rotary eccentric shaft.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1986-1988 | Mazda | RX-7 | Turbo |
| 1986-1988 | Mazda | RX-7 | GXL |
| 1986-1987 | Mazda | RX-7 | Base |
| 1987 | Mazda | RX-7 | Base 2+2 |
| 1987-1988 | Mazda | RX-7 | GXL 2+2 |
| 1987 | Mazda | RX-7 | LX |
| 1987 | Mazda | RX-7 | LX 2+2 |
| 1988 | Mazda | RX-7 | 10th Anniversary |
| 1988 | Mazda | RX-7 | Convertible |
| 1988 | Mazda | RX-7 | GTU |
| 1988 | Mazda | RX-7 | SE |
| 1988 | Mazda | RX-7 | SE 2+2 |
| 1987 | Mazda | RX-7 | Sport |
Why Choose Competition Clutch?
- Leading name in performance clutches and flywheel systems for rotary engines.
- Uses premium materials like 4140 Chromoly for durability in racing conditions.
- Precision CNC machining ensures exact fit and balance for RX-7 applications.
Frequently Asked Questions
-
Q: Is this counterweight required for all FC RX-7 flywheel swaps?
A: Yes for Competition Clutch lightweight or ultra-lightweight flywheels on 1986-1988 models. OEM flywheels have integrated balance. -
Q: What material is used and why?
A: 4140 billet Chromoly steel for high strength, low weight, and resistance to high-rpm stress in turbo rotary engines. -
Q: What warranty is provided?
A: 90-day limited warranty from Competition Clutch Inc. against defects in material or workmanship.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Securely boxed for protection during transit
- Weight: 3.67 lbs
Competition Clutch
Competition Clutch kits for Honda K, B, and D-series, Subaru WRX and STI EJ, Nissan 350Z, 370Z, 240SX, and 400Z, Mitsubishi EVO and DSM, Mazda Miata and RX-7, and sport compact applications are stocked at Black Ops Auto Works. Shop Stage 1 to Stage 5 clutch kits, twin disc clutches, lightweight flywheels, clutch discs, pressure plates, release bearings, and sport compact drivetrain parts for proven street, drag, road course, and high horsepower engine builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 197 Competition Clutch SKUs across the fitments and build levels enthusiasts actually use. What Competition Clutch Covers Competition Clutch offers staged clutch kits, twin and triple disc systems, lightweight flywheels, discs, pressure plates, release bearings, forks, and service components for sport compact, import, and selected domestic performance cars. Stage selection exp...
View Competition Clutch Products
Hardware
Engine hardware, fasteners, and mounting hardware kits for builds, fabrication, and suspension work are stocked at Black Ops Auto Works. Shop ARP engine bolts and stud kits, suspension mounting hardware from Fox and Rock Krawler, bumper mount kits, tie rod clamps, joint retainer tools, and single and kit-packaged hardware for domestic, import, and off-road platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 945 Hardware SKUs across engine hardware, suspension mounting hardware, and single-piece or kit-packaged fasteners. What This Collection Covers Hardware groups together the fasteners, mounting kits, clamps, and small components that hold engines, suspension systems, and accessories together. This includes ARP engine hardware such as intake manifold bolts and cam bolt kits, suspension mounting hardware from Fox and Rock Krawler for shock and steering stabilizer installs...
View Hardware Products
Hardware - Singles
Individual mounting hardware for automotive builds is stocked at Black Ops Auto Works. Shop single bolts, pins, clamps, crush washers, relays, and bar pins from ARP, Dorman, Vibrant, Fox, Fragola, HKS, Moroso, PRP, Westin, and Zone Offroad for a wide range of vehicle applications. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 329 individual hardware SKUs across type and application. What This Category Covers This collection covers small individual hardware components sold as single items rather than complete kits, for builders who need a specific bolt, pin, clamp, or fastener without purchasing a full assortment. Categories Included Single bolts, dowel pins, hose clamps, crush washers, electrical relays, and bar pins covering a wide range of mounting and fastening applications across suspension, exhaust, engine, and accessory installs. Why Buy Hardware as Singles Many hardware...
View Hardware - Singles Products