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The Mazda rotary engine has long been celebrated for its unique design and performance capabilities. Among the most iconic of these engines are the 13B-REW and the 20B-REW. Both engines have their own distinct characteristics and potential for power gains, making them popular choices among enthusiasts. This article will compare the two engines, focusing on their specifications, performance, and tuning potential.
Overview of the 13B-REW
The 13B-REW is a part of Mazda’s 13B family of rotary engines. It gained fame in the RX-7 and is known for its lightweight design and high-revving capabilities.
- Displacement: 1.3 liters
- Power Output: Approximately 280 hp (varies by model)
- Torque: 231 lb-ft
- Configuration: Twin rotor
Overview of the 20B-REW
The 20B-REW is a larger version of the rotary engine, featuring three rotors. It is found in the RX-8 and is known for its enhanced power delivery and torque.
- Displacement: 2.0 liters
- Power Output: Approximately 300 hp (varies by model)
- Torque: 274 lb-ft
- Configuration: Triple rotor
Performance Comparison
When comparing the performance of the 13B-REW and the 20B-REW, several factors come into play, including power delivery, responsiveness, and tuning potential.
Power Delivery
The 20B-REW generally offers better power delivery due to its larger displacement and additional rotor. This results in a smoother power band and increased torque, making it more suitable for high-performance applications.
Responsiveness
The 13B-REW is known for its quick revving and lightweight design, allowing for a more agile driving experience. Enthusiasts often prefer the 13B-REW for its immediate throttle response and high-revving nature.
Tuning Potential
Both engines have significant tuning potential, but they cater to different types of builds. The 13B-REW can be easily modified for lightweight performance, while the 20B-REW can handle more power upgrades due to its robust design.
Aftermarket Support
Aftermarket support is crucial for those looking to enhance their rotary engines. Both the 13B-REW and 20B-REW have extensive aftermarket parts available, but there are some differences.
- 13B-REW: A wide variety of performance parts, including turbo kits, exhaust systems, and engine management systems.
- 20B-REW: While parts are available, the selection may be more limited compared to the 13B-REW due to its less common application.
Cost Considerations
Cost is an important factor when choosing between the two engines. Generally, the 13B-REW is more affordable to purchase and modify, making it a popular choice for budget-conscious enthusiasts.
The 20B-REW, while offering more power, tends to be more expensive due to its rarity and complexity. This can lead to higher costs for both parts and labor when tuning or rebuilding.
Conclusion
Ultimately, the choice between the 13B-REW and the 20B-REW depends on the goals of the driver. The 13B-REW is ideal for those seeking a lightweight, high-revving experience, while the 20B-REW offers greater power and torque for high-performance builds. Both engines have their strengths and weaknesses, and understanding these can help enthusiasts make an informed decision.