O.S. Engine OS-1A400 Circuit-Ready 1/10 200mm Engine  [OS-1A400]

O.S. Engine OS-1A400 - O.S Speed T1201 1/10 On Road Touring Car Engine
Price:
£291.65
Brand:
O.S. Engine
Model:
OS-1A400
Condition:
Brand New
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O.S. Engine OS-1A400 Track-Focused Engine Outline

The O.S. Engine OS-1A400 is tailored for 1/10th scale 200mm class competition, building on the Speed 12XZ Spec.III lineage. It aims to combine better fuel economy with more accessible torque for precise lap control.

Refined Long-Stroke and Carburetion

The long-stroke configuration broadens the usable powerband on the OS-1A400, while the improved carburetor offers finer fuel metering for cleaner throttle transitions. The low centre of gravity cooling head helps reduce pitching and improves handling stability during fast direction changes.

Key Design Notes and Figures

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

The OS-1A400 is a solid choice for drivers seeking consistent power delivery and efficient fuel use in competitive 1/10th touring racing.

What are good first steps after fitting the engine?

Confirm mount alignment, fit the exhaust correctly, fill with recommended fuel, and carry out a progressive run-in to stabilise parts before final tuning.

How do I optimise fuel consumption for mains?

Use conservative needle settings that maintain midrange torque without overriching, and perform practice runs to measure fuel use under race conditions.

Are spare parts readily available?

Common wear items like glow plugs and carburetor components are usually available; keep spares for race days to avoid downtime.

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