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O.S. Engines Nitro Combos – B21, B2105 & Max-B21

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Nitro Engines

#OS1EK01 – O.S.SPEED B2105 3.5cc Buggy Engine Combo Set

Rated 4.2 out of 5

£575.99

Fifth-generation O.S.SPEED B2105 3.5cc nitro engine delivers evolved power and torque for competitive off-road racing. This combo set includes TB02 EFRA2089 pipe and MB01-75 manifold, maximising performance. DLC-treated crankshaft and redesigned cylinder ensure reliability and drivability. Serious racers only.

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Nitro Engines

#OS1DL02 – O.S. SPEED B21 Ongaro World Champion Combo Set

Rated 4.6 out of 5

£599.99

Davide Ongaro’s world championship-winning nitro engine, the O.S. SPEED B21 features a custom counter-web crankshaft and specially designed combustion chamber for smooth power delivery and competitive edge. This 1/8 off-road combo set includes tuned silencer and manifold. Ideal for serious racers.

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Nitro Engines

#OS1CJ03 – O.S. Speed B21 Ronda Drake Edition 2 Combo

Rated 4.4 out of 5

£551.99

This nitro-powered drift car combines Ronda Drake’s signature design with enhanced performance engineering. The lightweight aluminium chassis with pink accents reduces centre of gravity whilst dual reducers—6.5II and 7.5mm—deliver versatile gearing. Experienced nitro enthusiasts and collectors will appreciate the race-proven specifications and included accessories.

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Nitro Engines

#OS1EG01 – O.S. SPEED MAX-B21 Combo Set

Rated 4.8 out of 5

£311.99

This 3.5cc nitro engine delivers smooth power across 4,000–41,000 RPM, bridging entry-level and experienced drivers seamlessly. The 1/8 buggy engine combines O.S. engineering excellence with included exhaust system and accessories, ready for both on and off-road racing performance.

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Nitro Engines

#OS1DA01 – O.S. SPEED B2104 Off-Road Combo

Rated 5 out of 5

£479.99

O.S. SPEED’s fourth-generation B2104 nitro engine delivers evolved low-speed response and torquey mid-range performance for competitive off-road racing. This combo includes TB03 silencer with 80mm manifold, new 3-port piston/liner, DLC-coated crankshaft with tungsten counterweights, and optimised case cover plate for consistent idling and responsive throttle control.

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Nitro Engines

#OS1CJ00 – O.S. SPEED B21 Adam Drake 3 Off-Road

Rated 4.9 out of 5

£479.99

Developed with Adam Drake, this 3.49cc nitro buggy engine features a redesigned crankcase for smoother power delivery across all speeds. The lightweight, blue-anodised aluminium head sits 3mm lower, improving handling and reducing weight. Includes TB02 silencer and OS SPEED P3 GOLD glow plug. Ideal for experienced nitro enthusiasts.

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O.S. Engines Nitro Combos – B21, B2105 & Max-B21 | RCUK