Pro-Tuned Power for Off-Road Racing Excellence
This is the 521 GTS Pro Tuned Gen3 3.5cc (.21) Off-Road Nitro Engine from REDS, a high-performance engine designed for serious racers who demand power, efficiency, and durability. Pro-tuned by Mario Rossi, this engine is built for maximum throttle response, acceleration, and reliability in the most demanding off-road conditions. Featuring a reinforced steel crankshaft, advanced cooling system, and precision-machined internals, the 521 GTS Pro Tuned Gen3 delivers consistent power and smooth handling, making it the ultimate choice for competitive 1/8 off-road racing.
About the 521 GTS Pro Tuned
Precision-Tuned for Maximum Performance
The 521 GTS Pro Tuned Gen3 is meticulously crafted to provide superior durability and race-ready power. Its high-strength steel crankshaft minimizes wear and enhances longevity, while the optimized porting and fuel efficiency ensure extended run times without sacrificing performance. Equipped with performance ball bearings and an advanced cooling system, this engine is designed to withstand intense racing conditions, maintaining stability and responsiveness even in high-temperature environments.
Features:
- 3.5cc (.21) displacement for high-performance off-road racing
- Pro-tuned by Mario Rossi for peak competition-level performance
- High-strength steel crankshaft for superior durability
- Optimized porting design for smooth acceleration and throttle response
- Advanced cooling system for consistent performance in extreme conditions
- High fuel efficiency for longer run times
- Precision-machined internals for maximum reliability
- Performance ball bearings for reduced friction and improved efficiency
- Designed for 1/8 off-road racing applications
Includes:
- (1) 521 GTS Pro Tuned Gen3 3.5cc (.21) Off Road Nitro Engine
Specifications:
| Displacement |
.21 cu.in (3.5cc) |
| Recommended Application |
1/8 Off-Road |
| Bore |
0.64in (16.2mm) |
| Stroke |
0.67in (16.9mm) |
| Output |
- |
| Intake Ports |
5 |
| Exhaust Ports |
1 |
| Practical RPM |
- |
| Weight |
12.17oz (345g) |
