REDS 521 Competizione S-Line 3.5cc (.21) Off Road Nitro Engine Combo w/2143 Torque X-ONE Pipe
About this part
Balanced Performance Off-Road Nitro Engine
The 521 Competizione S-Line Off Road Nitro Engine Combo with 2143 Torque X-ONE Pipe from REDS is a complete performance package built for 1/8 scale buggy and truggy racers. Designed to deliver smooth, controllable power, this combo pairs a proven competition engine with a tuned pipe optimized for torque and efficiency. It offers a strong balance of performance, reliability, and value for drivers at multiple skill levels.
About the 521 Competizione Engine
Advanced 5-Port Power Delivery
The 521 Competizione engine features a modern 5-port sleeve design that enhances airflow and improves overall efficiency. This setup produces a smooth, linear power band that is easy to control across a wide range of track conditions. Updated piston and sleeve materials help maintain strong compression and extend engine life. The result is dependable performance with a balance of speed and drivability.
Precision Carburetor Tuning Control
Equipped with a high-quality 3-needle aluminum carburetor, this engine allows for precise tuning and consistent throttle response. Borrowing design elements from higher-end racing platforms, it includes a durable polymer insulator and a secure double grub screw linkage system. These features make adjustments easier while maintaining stable operation. Drivers benefit from predictable performance even as conditions change.
Matched Pipe for Torque and Efficiency
The included 2143 Torque X-ONE pipe is specifically designed to complement the engine’s power characteristics. It enhances low to mid-range torque while maintaining strong top-end performance. This pairing improves throttle response and overall drivability on technical tracks. Together, the engine and pipe create a well-balanced system optimized for racing performance.
Features:
- 5-port competition sleeve design
- 3.5cc (.21) off-road nitro engine
- 3-needle aluminum carburetor
- Steel crankshaft construction
- Steel rear bearing design
- High-stiffness die-cast crankcase
- Smooth and linear power delivery
- Improved fuel efficiency
- Easy and stable tuning
- Includes matched 2143 Torque X-ONE pipe
Includes:
- (1) 521 Competizione S-Line 3.5cc (.21) Off-Road Nitro Engine
- (1) 2143 Torque X-ONE Pipe
Specifications:
| Displacement | .21 cu.in (3.5cc) |
|---|---|
| Recommended Application | 1/8 Off-Road |
| Bore | 0.64in (16.2mm) |
| Stroke | 0.67in (16.9mm) |
| Intake Ports | 5 |
| Exhaust Ports | 1 |
| Carburetor Type | VCX3-A Aluminum 3-Needle |
| Glow Plug | REDS TS4 |
| Recommended Fuel | 25–30% Nitro, 8–10% Oil |
| Break-In Fuel | 12% Oil |
| Weight | 12.17oz (345g) |