O.S. Engine OS-1A100 - Speed R2102 High Precision 1/8 On-Road Engine  [OS-1A100]

OS OS-1A100 - OS Speed R2102 1/8 On-Road Racing Engine
Price:
£331.71
Brand:
O.S. Engine
Model:
OS-1A100
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Built for Control: O.S. Engine OS-1A100

The O.S. Engine OS-1A100 - Speed R2102 is aimed at competitive 1/8 on-road drivers seeking precise throttle response and dependable construction. It balances peak power with controllable midrange behaviour for race conditions.

Measurements and Power Characteristics

Featuring a 3.49cc displacement, 16.08mm bore and 17.2mm stroke, this engine provides a practical RPM span from 4,000 to 45,000. Output is cited at 2.8ps at 33,000 RPM, offering a useful combination of torque and top speed.

Component Improvements for Longevity

The rear bearing has been upgraded to a ceramic rear ball bearing to reduce friction and improve life expectancy. The cooling head has been lowered by 3mm to reduce the centre of gravity for improved handling at speed.

Adaptable Setup for Varying Conditions

An extra inner head is included to let you tune the low and mid-range torque depending on circuit demands. This option simplifies adapting the engine to different grip levels and layouts.

Specifications

  • Displacement: 3.49cc
  • Bore: 16.08mm
  • Stroke: 17.2mm
  • Practical RPM Range: 4,000-45,000 RPM
  • Output: 2.8ps/33,000 RPM (2.76hp/33,000 RPM)
  • Weight: 340g

For experienced competitors, the OS-1A100 provides a tuneable platform with durable upgrades that support regular racing use.

What are the common tuning steps after installation?

After fitting, run the engine at varying throttle levels, check plug colour, and adjust high and low needles incrementally until temperatures and response match your expectations.

Is this engine easy to service trackside?

Yes, routine items like the glow plug, collet and exhaust seals are straightforward to replace, and the included spare inner head aids quick setup changes.

How does the engine behave in cold conditions?

Cold air may require richer starting and slightly different needle settings; allow the engine to warm through with short runs before full-throttle laps.

What should I carry spares for at the track?

Bring spare glow plugs, an extra exhaust seal, a spare taper collet and basic hand tools to address the most common service needs quickly.

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