The OS Speed R2105 3.5cc Track S26704 thermal engine is the very definition of engineering perfection. Based on the R2104 model, used during the last world championships in the United States , this engine further pushes the limits in terms of performance.
The 9-transfer piston sleeve with new diagrams increases torque on high-grip tracks . The diameter of the counterweight on the crankshaft has been increased from 4 to 4.5mm for a smoother upshift . These improvements provide a gain in torque at all speeds , providing unprecedented performance and efficiency.
The mirror-polished cylinder head is not only aesthetically pleasing, but is also a guarantee of quality and durability. Thanks to the transparent anodizing , the cylinder head is protected, promising a long life for the engine. In addition, the crankcase plug with metal insert limits friction between the connecting rod and the plug, thus extending the life of these essential components.
The 21M triple adjustment carburettor is equipped with a richness screw with double O-rings facilitating adjustment on long Runs . This provides a more precise and optimal driving experience, allowing engine performance to be finely tuned for specific use.
With a displacement of 3.49cc, a bore of 16.08mm and a stroke of 17.20mm, this engine offers an impressive power of 2.76HP at 35,000 rpm. Its operating speed ranges from 4,000 to 45,000 rpm and despite all this performance, it only weighs 345 g.
The OS Speed R2105 3.5cc thermal engine is intended for RC vehicle enthusiasts looking for the best possible performance. Whether you are a professional driver preparing for the next world championship or an RC enthusiast wanting to have a state-of-the-art track car, this engine is for you.
- Piston sleeve with 9 transfers with new diagrams increasing the torque on the track with strong grip.
- Increase in the diameter of the counterweight on the crankshaft (Dia 4 to 4.5mm) allowing a smoother speed increase range.
- Cylinder head with polished mirror finish (transparent anodizing to protect the material)
- Crankcase cap with metal insert limiting friction between the connecting rod and the cap.
- 21M triple adjustment carburetor. Richness screw with double O-rings facilitating adjustment on long runs
- The new carburetion also provides a gain in torque at all speeds.
- Displacement: 3.49cc
- Bore: 16.08mm
- Stroke: 17.20mm
- Power: 2.76 HP /35,000 rpm
- Operating speed: 4,000 – 45,000 rpm
- Weight: 345g
