Description
20B Rotary Engine For Sale USA – Genuine 20B-REW 3-Rotor JDM Engines
20B Rotary Engine ForSale USA If you are searching for a 20B rotary engine for sale in the USA, you are looking for one of Mazda’s most distinctive and collectible rotary powerplants.
The Mazda 20B-REW is a three-rotor, twin-turbocharged Wankel engine originally developed for the Japanese-market Mazda Eunos Cosmo. With approximately 1,962 cc of displacement, three rotors and sequential twin turbochargers, the 20B offers a combination of compact design, high-revving performance and a distinctive rotary exhaust note.
Genuine 20B engines are significantly harder to find than the more common Mazda 13B engines. That scarcity makes a properly identified, complete and compression-tested 20B particularly attractive to collectors, rotary enthusiasts and builders looking for a unique engine for a high-performance project.
The image above should be placed immediately after the introduction to visually establish the product before the technical information begins.
What Is the Mazda 20B Rotary Engine?
The 20B-REW is a three-rotor rotary engine developed for the Mazda Eunos Cosmo. Unlike a conventional piston engine, the rotary engine uses triangular rotors moving inside epitrochoidal housings rather than pistons moving up and down inside cylinders.
The 20B has three 654 cc rotor chambers, giving it a nominal displacement of 1,962 cc. Its factory configuration used sequential twin turbochargers and electronic fuel injection.
The engine was produced for the Eunos Cosmo during the early 1990s, making genuine 20B engines now several decades old and increasingly difficult to source in good condition.
20B Rotary Engine ForSale USA Specifications
Here are commonly cited specifications for the production Mazda 20B-REW:
| Specification | Mazda 20B-REW |
|---|---|
| Engine Type | Wankel Rotary |
| Rotor Configuration | 3 Rotor |
| Displacement | 1,962 cc |
| Rotor Size | 654 cc × 3 |
| Aspiration | Sequential Twin Turbo |
| Compression Ratio | Approximately 9.0:1 |
| Factory Rated Power | Approximately 276–280 hp |
| Factory Rated Torque | Approximately 296 lb-ft / 41 kgm |
| Fuel System | Electronic Fuel Injection |
| Ignition | Distributorless electronic ignition |
| Original Application | Mazda Eunos Cosmo |
| Production Era | Approximately 1990–1995/1996 |
| Configuration | Longitudinal |
| Engine Type | 20B-REW |
Published references commonly list the 20B-REW at approximately 276 hp, while period specifications are often quoted around 280 PS.
A close-up image works well here because buyers searching for a 20B engine often want to visually confirm that they are looking at a genuine three-rotor Cosmo powerplant rather than a conventional 13B.
Why Is the 20B Rotary Engine So Rare?
The 20B is rare because it was not a mass-market engine sold across Mazda’s global vehicle range.
It was specifically associated with the Mazda Eunos Cosmo, a Japanese-market luxury performance coupe. The Cosmo could also be equipped with a 13B, but the three-rotor 20B-REW is the engine that makes the higher-specification Cosmo particularly desirable among rotary enthusiasts.
Because the original production run ended decades ago, today’s supply depends heavily on:
- Imported JDM engines
- Existing Cosmo donor vehicles
- Private collections
- Specialty rotary suppliers
- Engine rebuilders
- Used engine inventories
- Complete front clips and half cuts
This limited supply is one reason a genuine 20B can command substantially more than a typical used Mazda 13B.
20B Rotary Engine ForSale USA 3-Rotor Twin-Turbo Engine
One of the defining characteristics of the 20B is its three-rotor configuration combined with sequential twin turbocharging.
The additional rotor gives the 20B a different power delivery and exhaust character compared with Mazda’s two-rotor engines.
The sequential turbo system was designed to provide usable response at lower engine speeds while allowing the second turbocharger to contribute as engine speed and load increased.
For enthusiasts, the combination of:
- Three rotors
- Twin turbochargers
- Compact rotary architecture
- High-revving capability
- Distinctive exhaust sound
- Strong aftermarket potential
makes the 20B an attractive foundation for specialized performance builds.
This image should appear directly after the explanation of the twin-turbo/three-rotor configuration so visitors can see the complete engine in its original vehicle environment.
Mazda 20B Engine For Sale in the USA
Finding a Mazda 20B engine for sale in the USA requires more research than purchasing a common replacement engine.
Current U.S. listings demonstrate how limited the market can be. For example, recent listings have shown complete 20B assemblies around the $12,500 range, while another specialty listing has advertised a 20B Type-C engine at approximately $16,999. Prices can vary considerably according to mileage, completeness, compression condition, accessories, turbocharger condition and whether the engine has been rebuilt.
These examples should be considered market observations rather than a fixed market price.
When purchasing a 20B, buyers should evaluate the actual engine rather than choosing solely on advertised price.
What Should Be Included With a 20B Engine?
A complete 20B engine assembly can potentially include:
- 20B engine block and rotor housings
- Rotors
- Eccentric shaft
- Intake manifold
- Exhaust manifold
- Twin turbochargers
- Alternator
- Starter
- Fuel injectors
- Ignition components
- Wiring harness
- Oil pan
- Water pump
- Accessories
- Sensors
- Throttle body
- Engine mounts or brackets where available
However, the exact contents vary between sellers and donor vehicles.
Some 20B engines are sold as long blocks, while others are supplied as complete assemblies with turbochargers, intake systems, wiring and accessories.
Always confirm exactly what is included before purchasing.
A pallet/crate photograph is especially useful on this section because it helps U.S. buyers understand how a specialty rotary engine may be prepared for freight shipment.
20B Rotary Engine Compression Testing
Compression testing is one of the most important checks when buying a used rotary engine.
A conventional piston-engine compression test is not directly equivalent to a rotary-engine compression test. Rotary engines have multiple combustion chambers associated with each rotor, so a proper rotary-specific test can provide much more useful information about the condition of the engine.
For a used 20B, buyers should ask for documentation covering:
- Compression results
- Test procedure
- Engine temperature during testing
- RPM during testing
- Battery condition
- Results for all three rotors
- Housing and seal condition where known
- Oil pressure where available
- Evidence of previous rebuilding
A seller who can provide meaningful test information gives the buyer a much better basis for evaluating the engine.
20B Apex Seals, Rotor Housings and Internal Condition
As with any older rotary engine, the condition of the internal components matters.
Important components include:
Apex Seals
Apex seals help maintain the combustion chamber seal as the rotor moves through the housing. Their condition can have a major effect on compression and engine performance.
Rotor Housings
Rotor housings should be inspected for damage, excessive wear and problematic surface conditions.
Side Seals and Corner Seals
These seals also contribute to combustion sealing and should be inspected during a rebuild.
Eccentric Shaft
The eccentric shaft is a critical component of the rotary engine and should be checked for damage, wear and correct condition.
Place this technical image here to reinforce the importance of inspecting internal components before purchasing a used or imported 20B.
Is a 20B Engine Good for an RX-7 Swap?
The 20B has become popular among rotary enthusiasts interested in custom engine swaps.
It can be considered for high-performance projects involving platforms such as:
- Mazda RX-7 FD
- Mazda RX-7 FC
- Custom rotary builds
- Drift cars
- Track cars
- Show cars
- Competition vehicles
- Fabricated performance projects
However, a 20B swap is not simply a bolt-in replacement for every vehicle.
Depending on the chassis and intended power level, the project may require modifications to:
- Engine mounts
- Wiring
- ECU
- Cooling system
- Fuel system
- Exhaust
- Intake
- Intercooler
- Transmission
- Driveshaft
- Differential
- Axles
- Oil system
- Engine management
Vehicle compatibility should always be confirmed before ordering.
20B Rotary Engine Power Potential
The factory 20B-REW was conservatively rated at roughly 276–280 hp, but modified 20B engines can be built for considerably greater output.
The actual power potential depends on the condition of the engine, turbocharger selection, fuel system, ECU calibration, cooling system, exhaust system, intake system, seals, porting and the quality of the build.
A properly engineered 20B performance build may therefore be capable of significantly more power than the factory configuration.
However, there is no single guaranteed horsepower figure for every modified 20B.
The engine build should be matched to the intended use and power target.
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How Much Does a 20B Rotary Engine Cost in the USA?
The price of a 20B rotary engine for sale in the USA can vary dramatically.
Factors that influence price include:
- Engine mileage
- Compression results
- Complete versus long-block configuration
- Turbocharger condition
- Included accessories
- Wiring and ECU availability
- Engine history
- Rebuild status
- Donor vehicle
- Import availability
- Shipping costs
- Warranty or return policy
Recent U.S. market examples have included complete 20B engines listed around $12,500 and other specialty listings around $16,999. These are individual asking prices and should not be treated as a universal 20B market value.
For a buyer, the cheapest engine is not necessarily the best deal.
A documented, compression-tested and complete 20B may provide significantly better value than a cheaper engine with unknown history.
What to Check Before Buying a 20B Engine
Before purchasing a 20B rotary engine, ask the seller for detailed information.
Recommended Buyer Checklist 20B Rotary Engine ForSale USA
- Is it a genuine Mazda 20B?
- Is it a 20B-REW?
- Is it a three-rotor engine?
- What is the donor vehicle?
- What year was the engine manufactured?
- What is the mileage?
- Has it been compression tested?
- Are compression numbers available?
- Are the turbochargers included?
- Is the wiring harness included?
- Are the injectors included?
- Is the alternator included?
- Is the starter included?
- Is the intake manifold included?
- Is the ECU included?
- Has the engine been rebuilt?
- Are there photographs of the actual engine?
- What warranty is offered?
- How will the engine be packaged?
- What is the shipping cost?
This image should be placed directly beside the buyer checklist in the page layout if the website design permits, because it visually supports the inspection and verification message.
Genuine 20B vs. 13B: What’s the Difference?
The 13B is a two-rotor engine and is considerably more common in the Mazda rotary world.
The 20B adds a third rotor and was developed specifically for the Eunos Cosmo application.
| Feature | 13B | 20B |
|---|---|---|
| Rotor Count | 2 | 3 |
| Common Mazda Application | RX-7 and others | Eunos Cosmo |
| Typical Displacement | 1,308 cc | 1,962 cc |
| Turbo Versions | Yes | Yes |
| Availability | Relatively higher | Rare |
| Collectability | High | Very High |
| Swap Interest | High | Specialized |
The 20B’s rarity and three-rotor configuration are major reasons enthusiasts specifically search for a 20B rotary engine for sale rather than choosing a more readily available 13B.
Why Buy a 20B Rotary Engine ForSale USA From a Specialist?
Buying a rare engine requires more than simply finding a listing online.
A specialist supplier should be able to provide useful information about:
- Engine identification
- Donor vehicle
- Mileage
- Compression testing
- Included components
- Engine condition
- Shipping
- Packaging
- Warranty
- Compatibility
At Forged & Stocked Engines, our goal is to make specialty engine sourcing clearer for customers searching for rare performance and JDM powerplants.
If you are looking for a 20B rotary engine for sale in the USA, contact our team with your vehicle information, intended application and required engine configuration.
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20B Rotary Engine Shipping Across the USA
A 20B engine is a heavy mechanical assembly and should be professionally secured for freight transportation.
Depending on the package and engine configuration, shipping preparation may include:
- Drainage of fluids
- Protective caps
- Heavy-duty wrapping
- Palletizing
- Wooden crate protection
- Secure engine mounting
- Freight labeling
- Liftgate delivery when required
Customers should receive shipping information before completing a purchase, especially when the engine is being delivered to a residential address.
Frequently Asked Questions About the 20B Rotary Engine
Is the Mazda 20B a three-rotor engine?
Yes. The 20B is a three-rotor Wankel rotary engine.
How much displacement does a 20B have?
The production 20B-REW has approximately 1,962 cc, commonly described as 654 cc × three rotors.
Was the 20B used in the RX-7?
The 20B was originally used in the Japanese-market Eunos Cosmo rather than being a factory RX-7 engine. RX-7 owners commonly consider it for custom swaps.
Is the 20B turbocharged?
Yes. The production 20B-REW used a sequential twin-turbo configuration.
How much horsepower does a stock 20B make?
Published factory figures are commonly around 276–280 hp, depending on whether the figure is expressed in horsepower or PS.
Is a 20B good for an engine swap?
It can be an excellent foundation for a specialized performance project, but the swap may require custom engine mounts, wiring, ECU, fuel, cooling, exhaust, transmission and drivetrain modifications.
Where can I buy a 20B rotary engine in the USA?
Specialty JDM engine suppliers, rotary specialists and private sellers may offer 20B engines. When buying, verify the engine’s identity, compression condition, mileage, included components and warranty before sending payment.
Find a 20B Rotary Engine For Sale in the USA
The Mazda 20B-REW remains one of the most interesting three-rotor engines ever produced by Mazda.
Its 1,962 cc three-rotor configuration, sequential twin turbochargers, distinctive sound and rarity make it highly desirable for collectors and performance enthusiasts.
Whether you are building an RX-7 project, restoring an Eunos Cosmo, developing a rotary-powered competition car or simply searching for a rare JDM engine, choosing the right 20B is critical.
Looking for a 20B rotary engine for sale in the USA? Contact Forged & Stocked Engines to discuss availability, specifications, condition, shipping and your project requirements.
Forged & Stocked Engines
Specialty Engines • JDM Engines • Performance Engines • Rotary Engines
Contact: forgedandstockedengine@gmail.com
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