O.S. Engine OS-1A400 Competition 1/10 200mm Motor  [OS-1A400]

O.S. Engine OS-1A400 - O.S Speed T1201 1/10 On Road Touring Car Engine
Price:
AUD$558.74
Brand:
O.S. Engine
Model:
OS-1A400
Condition:
Brand New
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O.S. Engine OS-1A400 Engine Summary for Competitive Use

The O.S. Engine OS-1A400 is a dedicated 1/10th scale 200mm class powerplant from the Speed family, evolving from the Speed 12XZ Spec.III. Its development emphasises improved fuel economy and stronger torque where drivers need it most on track.

Torque-Focused Long-Stroke Engineering

Featuring a long-stroke configuration, the OS-1A400 delivers usable power through a broad RPM span. The precision carburetor enhances mixture accuracy, yielding tighter throttle control and progressive acceleration. The redesigned low centre of gravity cooling head also contributes to steadier vehicle dynamics at pace.

Technical Summary and Measurements

Specifications

  • Stroke Volume: 2.10cc
  • Output: 1.75ps / 35,000 RPM
  • Bore: 13.67mm
  • Stroke: 14.3mm
  • Practical RPM Range: 5,000 ~ 45,000 RPM
  • Weight: 223g

For racers aiming for consistent lap performance and efficient fuel use, the OS-1A400 brings thoughtful engineering and reliable behaviour to 1/10th 200mm touring cars.

What tuning steps help with midcorner drive?

Fine-tune midrange needle settings first and test on track to find the balance between response and tractability through midcorner sections.

Does the OS-1A400 need special mounting hardware?

Standard 1/10th touring car mounts are generally compatible, but confirm firewall alignment and spacer requirements before final installation.

How often should I service the carburetor?

Inspect and clean the carburetor regularly during race weekends, especially if running in dusty conditions, to maintain consistent fueling and response.

What checks prevent overheating during long runs?

Ensure cooling fins and head passages are clear, run the correct fuel mix, and monitor engine temps between heats to avoid sustained high load overheating.

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