O.S. Engine OS-13911 Speed 21 VZ-B-V Spec II World Champion Model - Race Tuned  [OS-13911]

Race-proven engineering behind the O.S. Engine OS-13911

In competitive RC racing, the O.S. Engine OS-13911 represents precise craftsmanship and track-focused performance. Built for car and buggy racers who expect consistency, this engine provides a balanced mix of power and dependability to suit both experienced competitors and dedicated hobbyists.

Sustained high RPM performance

The OS-13911 uses a 3.66cc displacement to produce strong output, rated at 2.5ps at 34,000 RPM. Its practical RPM range spans 3000~40000 RPM, giving tuners and drivers the flexibility to adapt to tight circuits or faster straights while keeping the engine responsive across the rev band.

Lightweight, serviceable construction

Weighing 349g, the OS-13911 keeps mass down without compromising durability. With a 16.6mm bore and 16.0mm stroke, the engine achieves an even performance profile that helps with fuel efficiency and repeatable lap times under race conditions.

How this engine helps lap time

Consistent mid to high RPM delivery is a standout trait of the OS-13911, allowing drivers to maintain pace under load. For those trimming tenths from their laps, the steady power curve and tunability make it an effective choice for close racing.

The O.S. Engine OS-13911 is geared toward racers who prioritise reliable, tunable output and a favourable power-to-weight ratio for competitive formats.