The O.S. Engine OS-1A100 - Speed R2102 is engineered for serious 1/8 on-road use, offering balanced power delivery and robust construction for regular track sessions. It suits drivers aiming for consistent lap times and dependable setup behaviour.
With a displacement of 3.49cc, bore of 16.08mm and stroke of 17.2mm, the OS-1A100 provides a competitive physical base. Expect a practical rpm spread from 4,000 up to 45,000 and an output rating of 2.8ps at 33,000 RPM for strong top-end performance.
The engine now uses a ceramic rear ball bearing in place of steel to cut friction and extend lifespan. Lowering the cooling head by 3mm shifts the centre of gravity down, aiding handling stability in fast direction changes.
Included with the engine is an extra inner head so you can tune torque and midrange response depending on track layout. This lets you optimise acceleration and driveability without major component changes.
For club and regional competitors, the OS-1A100 balances serviceability and on-track performance with sensible tuning options.
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