O.S. Engine OS-13911 Speed 21 VZ-B-V Spec II Pro Series Motor  [OS-13911]

Performance and reliability from the O.S. Engine OS-13911

The O.S. Engine OS-13911 is aimed at racers seeking consistent, race-ready performance. Its engineering focus is on steady power delivery and durability so drivers can concentrate on setup and driving lines.

Power across a wide rev range

The OS-13911 features a 3.66cc displacement and a peak of 2.5ps at 34,000 RPM, with a practical operating range of 3000~40000 RPM. That span provides flexibility for different track layouts and tuning preferences.

Compact yet robust build

At 349g, the engine remains light enough to help with handling while the 16.6mm bore and 16.0mm stroke produce a balanced performance profile that withstands race stresses.

Driver-focused traits for competition

Its steady high RPM behaviour reduces unpredictable power dips and gives racers a more predictable throttle response during long runs and aggressive driving.

For competitive drivers who value predictable tuning and a high power-to-weight ratio, the O.S. Engine OS-13911 is an excellent candidate for race builds.