From Restoration to Performance

Every rotary project is different.

Some customers are bringing a classic RX-2 or RX-3 back to its original condition. Others are restoring an RX-7 SA/FB, FC3S, or FD3S. Some are maintaining an RX-8 Renesis for everyday driving, while others are building high-performance street or track cars.

We support a wide range of projects, including:

Classic Restoration

Hard-to-find components for enthusiasts restoring older Mazda rotary vehicles and preserving their original character.

Engine Rebuilds

Rotary engine components and rebuild parts for customers rebuilding 10A, 12A, 13B, 20B, and other rotary platforms.

Performance Builds

Performance-focused components for enthusiasts looking for increased power, improved airflow, better cooling, upgraded oiling, turbocharging, and other modifications.

Engine Replacement

Rotary engines and replacement components for customers looking to get their Mazda back on the road.

Track & Competition Builds

Specialized components for demanding performance applications where engine preparation, supporting systems, and component selection are critical.

Our Rotary Engine Selection

We specialize in some of the most recognized Mazda rotary engine platforms.

10A Rotary

Parts and components for early Mazda rotary applications and classic restoration projects.

12A Rotary

Supporting the iconic 12A platform used across several classic Mazda rotary vehicles, including early RX-7 applications.

13B Rotary

A cornerstone of Mazda’s rotary history, with applications ranging from naturally aspirated builds to turbocharged performance engines.

13B-REW

The legendary twin-turbo rotary associated with the FD3S RX-7 and one of the most popular platforms among performance enthusiasts.

20B

Specialist components for Mazda’s unique three-rotor 20B platform, including Cosmo applications.

26B

Specialized components for four-rotor and serious motorsport-oriented rotary projects.

Our catalog includes products such as apex seals, side seals, corner seals, rotor housings, rotors, eccentric shafts, bearings, gaskets, rebuild kits, ignition components, turbo components, cooling upgrades, oiling solutions, intake and exhaust components, and other rotary-specific parts.

Quality Matters

Rotary engines are precision machines.

The quality and suitability of the components used during a rebuild or performance build can have a major impact on the finished engine.

For that reason, we focus on sourcing products that are appropriate for their intended application, whether you’re looking for genuine OEM components, OEM-equivalent parts, replacement components, or performance-focused aftermarket products.

We also encourage customers to verify fitment and application before purchasing, particularly when dealing with different generations, engine variations, and modified vehicles.

Helping You Find the Right Part

Finding a specific rotary component isn’t always easy.

You may know the vehicle—such as an RX-7 FD3S—but not the exact engine specification. Or you may know that you need a particular 13B component but aren’t sure which version is appropriate for your build.

Our team is available to help customers with:

• Rotary engine identification
• Part compatibility
• Engine application questions
• Rebuild component selection
• Performance component selection
• RX model-specific parts
• Replacement engine inquiries
• Hard-to-find rotary components

If you’re unsure about a part, contact us before ordering. Providing your vehicle model, year, engine type, and intended application can help us determine the most appropriate option.

Genuine Passion for Mazda Rotary

The rotary engine has earned a special place in automotive history.

Its compact design, high-revving character, unique combustion process, and unmistakable sound have made it a favorite among enthusiasts around the world.

At Bill Rotary Garage, we share that appreciation.

We believe these engines deserve to be maintained, rebuilt, improved, and enjoyed—not forgotten.

From a classic 12A restoration to a fully built 13B-REW performance engine, every project represents another opportunity to keep Mazda’s rotary legacy alive.

Serving Rotary Enthusiasts Worldwide

Rotary enthusiasts aren’t limited to one country or one community.

Customers around the world continue to restore RX-7s, maintain RX-8s, build rotary-powered projects, and search for components for classic Mazda models.

That’s why we make our products available to customers beyond our local market and provide shipping options for international orders where available.

We carefully package products for transportation and work with shipping providers to help get rotary components to customers safely and efficiently.

Our Mission

Keep Rotaries Alive. Keep Them Running. Keep Them Rotary.

Our mission is to become a trusted source for Mazda rotary enthusiasts looking for quality parts, engines, and performance components.

We want Bill Rotary Garage to be more than an online parts store.

We want it to be a place where rotary owners can find the components they need, get help identifying the right parts, and continue building, restoring, and enjoying these unique Mazda machines.

Why Choose Bill Rotary Garage?

Rotary-Focused

Our business is centered around Mazda rotary engines and the vehicles that use them.

Broad Model Coverage

We support parts and components for classic Mazda rotary models, RX-7 generations, RX-8, Cosmo, and other rotary applications.

Performance & Restoration

Whether your goal is originality, reliability, more power, or a complete performance build, we offer products for different types of projects.

Specialist Components

We carry rotary-specific components that can be difficult to locate through general automotive parts suppliers.

Fitment Support

Not sure which part you need? Contact us with your vehicle and engine information and we’ll help you identify the appropriate application.

Worldwide Service

We serve rotary enthusiasts across different markets and offer international shipping options where available.

Your Rotary Project Starts Here

Whether you’re rebuilding an engine, restoring an RX-7, maintaining an RX-8, searching for a rare classic Mazda component, or planning your next performance build, Bill Rotary Garage is here to help you keep your rotary project moving.

Explore our collection of rotary engines, rebuild components, performance parts, and Mazda-specific products.