The Ultimate Guide to the 20B Rotary Motor: Specs, Performance, and Options
The 20B rotary engine, renowned for its unique design and high power-to-weight ratio, has captivated automotive enthusiasts for decades. This engine is primarily found in Mazda’s Eunos Cosmo and is celebrated for its performance capabilities, particularly in racing applications. In this guide, we will delve into the specifications, applications, and various options available for the 20B rotary motor, providing a comprehensive resource for potential buyers and enthusiasts alike.
Comparison of 20B Rotary Engine Types and Applications
| Engine Type | Displacement | Configuration | Power Output | Common Applications |
|---|---|---|---|---|
| 20B-REW | 2.0L | 3 Rotor | 280 HP (stock) | Mazda Eunos Cosmo |
| 20B (Modified) | 2.0L | 3 Rotor | 1000+ HP | Racing, Drag Racing |
| Billet 20B | 2.0L | 3 Rotor | 1400+ HP | High-performance applications |
| 20B (Stock) | 2.0L | 3 Rotor | 280 HP (stock) | Street use, light modifications |
Overview of the 20B Rotary Engine
The 20B rotary engine is part of Mazda’s iconic Wankel engine family. Featuring three rotors, this engine offers a unique configuration that allows for compact design and high power output. The 20B is often associated with the Eunos Cosmo, a luxury sports coupe that showcases the engine’s capabilities. Its lightweight design contributes to superior handling and acceleration, making it a favorite among racing enthusiasts.
Performance Characteristics
Power and Torque
The 20B engine typically produces around 280 horsepower in its factory configuration. However, with modifications—such as custom porting and tuning—power outputs can exceed 1000 horsepower, especially in racing setups. The engine’s torque curve is also impressive, providing strong acceleration and responsiveness.
Reliability and Maintenance
While rotary engines are known for their unique power characteristics, they also require specific maintenance practices. Regular inspections and timely replacement of seals and gaskets are crucial. Companies like Pettit Racing (pettitracing.com) offer comprehensive rebuilds and services to ensure longevity and reliability.
Applications of the 20B Rotary Engine
The versatility of the 20B rotary engine allows it to be used in various applications, including:
- Street Performance: Many enthusiasts choose the 20B for street applications due to its lightweight design and high power output.
- Racing: Tuned engines can produce significant horsepower, making them suitable for drag racing and circuit racing.
- Show Cars: The unique design and sound of the rotary engine make it a popular choice for show cars.
Buying a 20B Rotary Engine
When looking to purchase a 20B rotary engine, consider the following options:
New vs. Used Engines
- New Engines: Companies like SR Motorsports (www.srmotorsports.com) offer completely rebuilt engines tailored to customer specifications.
- Used Engines: Websites like eBay (www.ebay.ca) and JDM Racing Motors (jdmracingmotors.com) frequently list used 20B engines sourced from Japan, often at competitive prices.
Custom Builds
For those seeking more performance, custom-built engines are available from specialized shops like Pac Performance (www.pacperformance.com.au). These engines can be tailored to specific racing requirements and performance goals.
Technical Specifications of the 20B Rotary Engine
| Feature | Specification |
|---|---|
| Displacement | 2.0L |
| Configuration | 3 Rotor |
| Power Output | Up to 1400+ HP (tuned) |
| Compression Ratio | 9.4:1 |
| Weight | Approximately 300 lbs |
| Fuel Type | Premium unleaded gasoline |
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Conclusion
The 20B rotary engine stands out in the automotive world for its unique design, robust performance, and versatility across various applications. Whether you’re looking for a stock setup for street driving or a high-powered racing engine, options abound. Reputable sources such as Pettit Racing, SR Motorsports, and Pac Performance provide a wealth of resources for both purchasing and modifying these engines.
FAQ
What is a 20B rotary engine?
The 20B rotary engine is a three-rotor Wankel engine produced by Mazda, primarily found in the Eunos Cosmo. It is known for its lightweight design and high power output.
How much horsepower does a stock 20B produce?
A stock 20B rotary engine typically produces around 280 horsepower, but modified versions can exceed 1000 horsepower.
Where can I buy a 20B rotary engine?
You can purchase a 20B rotary engine from various sources, including eBay (www.ebay.ca), JDM Racing Motors (jdmracingmotors.com), and specialized engine builders like SR Motorsports (www.srmotorsports.com).
What maintenance is required for a 20B rotary engine?
Regular maintenance includes inspections of seals and gaskets, oil changes, and ensuring proper cooling system function. Reputable builders like Pettit Racing offer rebuild services to maintain engine reliability.
Can I modify a 20B for racing?
Yes, many enthusiasts modify the 20B for racing, achieving power outputs of over 1000 horsepower with custom tuning and modifications.
What are the advantages of a rotary engine?
Rotary engines, like the 20B, are known for their compact size, lightweight design, and high power-to-weight ratios, making them ideal for performance applications.
Are there warranties on used 20B engines?
Warranties vary by seller, but many reputable JDM suppliers offer warranties on their used engines. Always check the terms before purchasing.
What is the difference between a stock and a billet 20B engine?
A stock 20B engine is a factory configuration, while a billet 20B features upgraded components for increased strength and performance, often used in high-stress racing applications.
How does the 20B compare to other rotary engines?
The 20B offers more power compared to its smaller counterparts, like the 13B, due to its larger displacement and three-rotor design, making it suitable for high-performance applications.
What are the common applications for the 20B rotary engine?
Common applications include street performance vehicles, racing cars, and show cars, showcasing the engine’s versatility and unique characteristics.
