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

OS OS-1A100 - OS Speed R2102 1/8 On-Road Racing Engine
Price:
AUD$641.90
Brand:
O.S. Engine
Model:
OS-1A100
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Performance and Balance from O.S. Engine OS-1A100

Designed with competitive on-road racers in mind, the O.S. Engine OS-1A100 - Speed R2102 combines a refined powerband with construction geared toward longevity. It is a solid option for builds where consistent throttle control matters.

Core Specs and Practical Power

The OS-1A100 has a displacement of 3.49cc, bore of 16.08mm and stroke of 17.2mm, producing a usable rpm range of 4,000 to 45,000. Rated output sits at 2.8ps at 33,000 RPM, delivering a reliable mix of torque and top speed.

Design Changes That Matter on Track

Replacing the steel rear bearing with a ceramic rear ball bearing reduces internal drag and improves longevity. The cooling head has been lowered by 3mm to help reduce roll and improve the engine's centre of gravity.

Fine Tuning with Included Parts

An extra inner head is supplied so you can tune low to mid-range torque for the specific demands of different circuits. Small changes to head timing and jetting will help you extract ideal driveability.

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

The OS-1A100 suits experienced racers who want a robust engine that responds well to tuning and race-day adjustments.

How should I approach initial tuning?

Start with manufacturer jetting guidance, run short sessions to check temperature and plug colour, then make incremental needle changes to suit your car and track.

Does the lowered head affect cooling needs?

Lowering the head helps handling but does not significantly change cooling capacity; monitor engine temps and adjust fuel or cowl vents if needed.

Are spare parts widely available?

Common service items like glow plugs, collets and seals are readily available through hobby shops and parts distributors to keep you on track.

What clutch setup pairs well with this engine?

A clutch tuned for smooth engagement and the engine's midrange torque is recommended; adjust shoes and springs to match your gearing and track layout.

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