O.S. 1DR01 Speed R21 Euro II Combo Competition 1/8 Engine  [OS-1DR01]

O.S. 1DR01 Speed R21 Euro II Combo
Price:
£300.16
Brand:
O.S. Engine
Model:
OS-1DR01
Condition:
Brand New
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Competitive On-Road Engineering in the O.S. 1DR01 Speed R21 Euro II Combo

Built for 1/8 on-road competition, the O.S. 1DR01 Speed R21 Euro II Combo blends reliable construction with race-tuned characteristics. It aims to deliver repeatable runs and predictable handling when pushed on technical circuits.

Precision Manufacturing for Racing

O.S. engines are respected for consistent build quality, and this model focuses on optimising airflow and minimising internal friction to sustain performance across a race program.

3.49cc Tuned for Track Use

The core 3.49cc engine is set up to provide a good mix of torque and top-end speed. The carburetor offers controlled throttle response and the cooling head promotes steady temperatures during extended track time.

What Makes the 1DR01 Race-Worthy

The O.S. 1DR01 Speed R21 Euro II Combo is engineered to produce strong acceleration and reliable top speed, making it suitable for competitive drivers who need consistent power delivery and robust components.

Specifications

  • Displacement: 3.49cc
  • Bore: 16.08mm
  • Stroke: 16.80mm
  • Power Output: 2.76 hp @ 34,000 RPM
  • Weight: 340g

The O.S. 1DR01 Speed R21 Euro II Combo is a solid choice for racers who prioritise controllable power and longevity across event weekends.

How close is tuning tolerance for this engine?

Tuning requires moderate precision; small needle adjustments can noticeably affect performance. Work in small increments and log settings for repeatability between sessions.

What should I inspect after a race?

Check the glow plug, fuel fittings, and cooling head for signs of wear or loosening. Clean the air filter and confirm the carburetor and throttle linkages are secure.

Can I use this in wet conditions?

Running in wet conditions is possible but extra care is needed to protect electronics and to prevent water ingress into the engine. Dry and service components promptly after wet running.

Is this suitable for endurance events?

With correct cooling and conservative tuning, the engine can be used in longer formats, though regular monitoring of temperature and fuel mixture is essential for endurance reliability.

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