The Comprehensive Guide to Buying Rotary Engines
When it comes to performance engines, rotary engines stand out due to their unique design and power delivery. Whether you’re a racer looking for a custom build or a car enthusiast wanting a factory rebuild, there’s a plethora of options available. This guide will provide you with everything you need to know about buying rotary engines, including types, applications, and key features.
Comparison of Rotary Engines
| Engine Type | Application | Power Output | Key Features | Pricing Range |
|---|---|---|---|---|
| 12A | Street/Performance | Up to 200 HP | Compact design, lightweight | $3,000 – $6,000 |
| 13B | Racing/Street | Up to 1,000 HP | High-revving, turbo options | $4,500 – $10,000+ |
| 20B (3 Rotor) | High Performance | 1,400+ HP | Increased displacement, unique design | $10,000 – $15,000+ |
| LiquidPiston | Aerospace/Military | Up to 1,000+ HP | Patented X Engine technology | Custom pricing |
| Toyan RS-S100 | Miniature Applications | 1-5 HP | Small footprint, low weight | $500 – $800 |
Types of Rotary Engines
Rotary engines come in various configurations, each suited for specific applications. The most common are the 12A, 13B, and 20B engines.
12A Rotary Engines
The 12A engine is ideal for street applications and entry-level racing. It delivers up to 200 HP and is known for its compact design and lightweight characteristics. The engine features a simple design, making it easier to maintain. Various performance parts are available to enhance its capabilities.
13B Rotary Engines
The 13B engine is perhaps the most popular rotary engine, especially in Mazda’s RX series. It offers a significant power range, from stock configurations to highly modified versions capable of exceeding 1,000 HP. Companies like Pettit Racing provide custom builds and rebuilds tailored to specific performance needs.
20B (3 Rotor) Rotary Engines
The 20B engine, known for its three-rotor design, provides exceptional power and torque. It is commonly used in high-performance racing applications, producing upwards of 1,400 HP. Builders like SR Motorsports specialize in creating custom 20B setups that can handle extreme power levels.
Applications of Rotary Engines
Rotary engines find their place in various fields, from racing to aerospace. Each application requires specific modifications and performance enhancements.
Automotive Racing
Rotary engines are prevalent in motorsport due to their high power-to-weight ratio. Companies like RotorSports Racing offer custom builds designed for racing, focusing on performance enhancements and reliability.
Aerospace and Military
Innovative companies like LiquidPiston are utilizing rotary engine technology for aerospace applications. Their X Engine design enhances efficiency, making it suitable for drones and urban aircraft.
Miniature Applications
For hobbyists and enthusiasts, miniature rotary engines like the Toyan RS-S100 are ideal for small-scale projects. These engines provide a unique solution for model aircraft and other lightweight applications.
Key Features of Rotary Engines
Understanding the features that differentiate rotary engines helps buyers make informed decisions.
Compact Design
One of the main advantages of rotary engines is their compact size, enabling them to fit into various chassis configurations. This design allows for weight savings, which is critical in racing applications.
Lightweight Construction
Rotary engines are significantly lighter than traditional piston engines, contributing to better handling and performance. This attribute is especially valued in racing scenarios where every ounce counts.
High Power Output
With proper modifications, rotary engines can achieve high power outputs. Builders like Pettit Racing and RotorSports Racing provide options for upgrading power levels tailored to specific needs.
Unique Power Delivery
Rotary engines deliver smooth and consistent power across a wide RPM range. This characteristic is particularly beneficial for racing applications, where maintaining optimal power delivery is crucial.
Technical Features Comparison of Rotary Engines
| Feature | 12A | 13B | 20B | LiquidPiston |
|---|---|---|---|---|
| Displacement | 1.2 L | 1.3 L | 2.0 L | 0.5 L (X Engine) |
| Rotors | 2 | 2 | 3 | 2 |
| Max RPM | 8,000 RPM | 10,000 RPM | 10,000 RPM | 10,000 RPM |
| Turbocharged Options | No | Yes | Yes | Yes |
| Applications | Street/Rally | Racing/Street | Racing | Aerospace/Military |
Related Video
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Conclusion
Buying a rotary engine requires careful consideration of your specific needs, whether for racing, street performance, or specialized applications. With options ranging from the compact 12A to the powerful 20B, and innovative designs like LiquidPiston’s X Engine, there’s a rotary solution for every enthusiast. Companies like Pettit Racing, RotorSports Racing, and SR Motorsports offer a variety of services to meet these needs.
FAQ
What is a rotary engine?
A rotary engine is a type of internal combustion engine that uses a rotary design to convert pressure into rotating motion. Unlike traditional piston engines, rotary engines have fewer moving parts, which can lead to lighter weight and more compact designs.
What are the benefits of rotary engines?
The main benefits include a high power-to-weight ratio, compact size, smooth power delivery, and fewer moving parts, which can lead to lower maintenance needs.
How much does a rotary engine cost?
Prices vary widely based on the engine type and modifications. Basic rebuilds can start around $3,000, while high-performance custom builds can exceed $15,000.
Can I modify a rotary engine?
Yes, rotary engines are highly modifiable. Many companies offer performance upgrades, including turbocharging, porting, and rebuilding with racing specifications.
Are rotary engines reliable?
When built and maintained properly, rotary engines can be reliable. However, they may require more attention regarding oil management and cooling compared to piston engines.
What applications are rotary engines used in?
Rotary engines are commonly found in automotive racing, street cars, aerospace applications, and even small-scale models.
How do rotary engines compare to piston engines?
Rotary engines are typically lighter and more compact than piston engines, offering smoother power delivery and a different maintenance profile. However, they may have different efficiency and durability characteristics.
Where can I buy a rotary engine?
Rotary engines can be purchased from specialized companies like Pettit Racing, RotorSports Racing, and SR Motorsports, which offer new builds, rebuilds, and parts.
What’s the difference between the 12A and 13B rotary engines?
The 12A engine has a smaller displacement (1.2 L) compared to the 13B (1.3 L), allowing for a higher power output in the 13B engine, making it more suitable for performance applications.
Do rotary engines require special maintenance?
Yes, rotary engines require regular oil changes and attention to cooling systems to ensure they operate efficiently and reliably.
