With the OS SPEED B2105 DLC, OS SPEED once again presents an off-road racing engine of absolute world-class caliber. As the fifth generation of the proven B21 series, the B2105 has been specifically further developed to offer a clear performance advantage under the toughest 1:8 off-road racing conditions – consistent, controllable, and powerful.

Thanks to a newly designed cylinder liner with a 3-port layout and a revised port shape, the engine delivers noticeably higher torque in the mid to upper rev range , combined with very smooth and linear power delivery . The result is an engine that can be precisely controlled in every driving situation and consistently delivers power.

The modified crankshaft with OS SPEED DLC coating not only ensures increased durability but also improves throttle response and overall responsiveness. At the same time, the internal geometry has been optimized to make the engine more user-friendly and easier to tune than its predecessor.

Another focus was on driving behavior: The lighter cooling head makes the vehicle more agile, which is particularly noticeable in rapid changes of direction and demanding off-road sections.

This COMBO set comes complete with a matched exhaust system, providing an immediately usable high-end solution for ambitious 1:8 buggy drivers.

Highlights

• 5th generation of the successful B21 off-road racing engines
• Newly developed 3-channel cylinder for more torque
• Uniform, linear power output across the entire speed range
• DLC-coated crankshaft for performance and durability
• Reduced weight of the cooling head for improved driving performance
• Ideal for demanding 1:8 buggy off-road races

Technical data

• Engine displacement: 3.49 cm³ / .21
• Bore: 16.27 mm
• Stroke: 16.80 mm
• Power output: approx. 2.68 hp at 34,000 rpm
• Practical speed range: 4,000 – 42,000 rpm
• Motor weight: approx. 348 g

Scope of delivery

• OS SPEED B2105 DLC Buggy Motor
• TB02 exhaust system (EFRA 2089)
• MB01-75 Manifold
• Glow plug T-P3
• Reducers Ø6 / Ø6.5
• Exhaust sealing ring
• Dust cap set (Ø3 / Ø16 / Ø18)