Description

5. Key Features & Benefits

Complete Genuine JDM Package

• Genuine Mazda 20B 3-rotor engine
• Removed from an Eunos Cosmo
• Directly imported from Japan
• Includes matching drivetrain components

Legendary 3-Rotor Performance

• Factory triple-rotor configuration
• Smooth high-RPM operation
• Exceptional power potential
• Ideal platform for naturally aspirated or turbocharged applications

Complete Drivetrain Included

• 20B long block assembly
• OEM Cosmo automatic transmission
• Rear differential
• Complete rear subframe assembly

Rare Collector Opportunity

• Hard-to-find factory 20B setup
• Increasingly scarce worldwide
• Valuable for restorations and custom builds
• Highly desirable among rotary enthusiasts

Excellent Swap Foundation

• Ideal for RX-7 conversions
• Suitable for custom chassis projects
• Strong starting point for performance builds
• Eliminates sourcing multiple drivetrain components separately

6. Detailed Product Description

Genuine Mazda 20B Triple-Rotor Power

The centerpiece of this package is the legendary Mazda 20B engine, originally developed for the luxury Eunos Cosmo platform. Unlike the more common 13B two-rotor engine found in many RX-7 and RX-8 models, the 20B features a unique three-rotor design that provides increased displacement, smoother operation, and significantly greater power potential.

The 20B has earned legendary status among rotary enthusiasts due to its unique characteristics, exceptional tuning capability, and unmistakable exhaust note. Whether maintained in near-factory form or upgraded for high-horsepower applications, the 20B remains one of the most respected rotary powerplants ever produced.

Complete Drivetrain Package

Unlike many engine listings that include only a long block or partial assembly, this package includes multiple key drivetrain components removed together from the donor vehicle.

Included:

• Mazda 20B 3-rotor engine
• OEM Eunos Cosmo automatic transmission
• Rear differential assembly
• Complete rear subframe assembly

Purchasing a complete package significantly simplifies the planning process for swaps and restorations while ensuring compatibility between major drivetrain components.

Ideal for High-End Rotary Swaps

The DM Mazda 20B 3-Rotor Engine with Rear Diff & Subframe – Complete JDM Package is commonly considered for:

• Mazda RX-7 FD3S conversions
• Custom rotary-powered projects
• Drift builds
• Street performance vehicles
• Show-quality builds
• Collector restorations
• Motorsports applications

Many enthusiasts choose the 20B specifically because of its unique combination of smooth drivability, incredible sound, and massive aftermarket support.

Imported Directly from Japan

Finding genuine 20B drivetrain packages outside Japan has become increasingly difficult. Most available units were produced for the Japanese domestic market and have become highly sought-after by collectors and builders worldwide.

This package was imported directly from Japan and preserved as a complete assembly, making it an attractive option for buyers seeking authentic JDM components.

Strong Future Value

As rotary enthusiasts continue to pursue original 20B engines for restorations and performance builds, availability continues to decrease.

Unlike common engine platforms that remain in large-scale production, genuine 20B assemblies represent a finite supply. For many buyers, a complete 20B package is both a performance investment and a collectible automotive asset.

7. Why Choose This Product?

There are many reasons why rotary enthusiasts specifically search for complete 20B packages rather than individual components.

Authenticity

This is a genuine Mazda 20B drivetrain package sourced from the Eunos Cosmo platform.

Convenience

Includes major drivetrain components together, reducing sourcing time and compatibility concerns.

Rarity

20B engines are becoming increasingly difficult to locate in complete, unmodified form.

Performance Potential

The triple-rotor platform remains one of the most capable rotary engines available for custom performance applications.

Collector Appeal

The 20B has become one of Mazda’s most iconic engines and continues to attract enthusiasts worldwide.

8. Perfect For

This package is ideal for:

• RX-7 FD3S owners planning a 20B conversion
• Rotary engine collectors
• JDM vehicle enthusiasts
• Performance workshops
• Drift car builders
• Show car projects
• High-end custom fabrication shops
• Eunos Cosmo restorations
• Motorsport applications
• Enthusiasts seeking authentic JDM drivetrains

9. Frequently Asked Questions

Is this a genuine Mazda 20B engine?

Yes. This package includes a genuine Mazda 20B triple-rotor engine originally sourced from an Eunos Cosmo.

What components are included?

The package includes the 20B engine, OEM automatic transmission, rear differential, and complete rear subframe assembly.

Can the engine be used in an RX-7 FD3S swap?

Yes. The 20B is one of the most popular engine upgrades for FD3S RX-7 builds, although custom fabrication and supporting modifications may be required.

Is the transmission included?

Yes. The original Eunos Cosmo automatic transmission is included with the package.

Are you willing to separate components?

No. This package is sold as a complete set and is not being parted out.

Is the engine suitable for turbo upgrades?

The 20B platform is widely known for excellent turbocharging potential and is commonly used in high-performance applications.

Can this package be shipped internationally?

International shipping options may be available. Contact us for shipping quotes and destination-specific information.

Why is the Mazda 20B so desirable?

The 20B is Mazda’s only factory-produced three-rotor engine. Its rarity, smooth power delivery, tuning potential, and unique sound have made it one of the most sought-after rotary engines ever produced.

Opportunities to purchase a complete genuine 20B drivetrain package are becoming increasingly rare. If you’ve been planning a serious rotary build, FD3S conversion, collector project, or custom JDM build, this is your chance to secure one of Mazda’s most legendary powerplants.

Contact us today for current availability, additional photos, shipping options, and complete package details before this rare Mazda 20B setup is gone.

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine

DM Mazda 20B 3-Rotor Engine