O.S. Speed 12 TZ Spec II Off-Road Tuned 1/10 Engine  [OS-11385]

O.S. Engine Speed 12TZ Spec II
Price:
AUD$543.86
Brand:
O.S. Engine
Model:
OS-11385
Condition:
Brand New
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Track-Focused O.S. Speed 12 TZ Spec II for 1/10 Models

Designed for competitive 1/10 class racing, the O.S. Speed 12 TZ Spec II offers race-bred features and IFMAR conformity. Its construction emphasises steady performance and tuneability for club and event use.

Design Elements for Stable Power

The engine features a silicon-packed crankshaft that enhances rotational balance to limit vibration at high revs. A nine-fin aluminium cooling head supports sustained performance, while the twin-piece turbo head with a magnesium outer shell aids strength and heat dissipation.

Package Contents and On-Track Benefits

Supplied items include the P7 glow plug and the 11HBS Slide Valve Carburetor, chosen for its accurate throttle action. Also in the kit are a decal sheet, instruction manual, a 5.5mm carb reducer and an exhaust sealing ring to get you running quickly.

Specifications

  • Displacement: 0.128 cu in (2.1cc)
  • Bore: 0.543" (13.8mm)
  • Stroke: 0.551" (14.0mm)
  • Practical RPM Range: 5,000-44,000
  • Power Output: 1.7 ps/35,000 RPM
  • Weight: 7.336oz (208g)
  • Fuel: 10%-30% nitro, minimum 16% lubricant

The O.S. Speed 12 TZ Spec II is aimed at experienced racers wanting compact, controllable power in a 1/10 package. It is supplied without a warranty, so routine maintenance and tuning knowledge are recommended.

What are the best initial tuning steps?

Begin with factory carb settings, run a few short sessions, then check plug color and temp readings. Make small needle changes and re-evaluate driveability after each change.

Is the engine suitable for both practice and racing?

Yes, its robust cooling and balanced crank design make it reliable for repeated practice runs as well as race events, provided routine checks are carried out.

How should I store the engine between events?

Drain fuel, fog the engine lightly with after-run oil, and keep it in a dry box to prevent corrosion and preserve seals and bearings.

Can I upgrade parts later?

You can opt for compatible cooling heads or aftermarket gaskets and seals as needed, but keep the core spec and IFMAR compliance in mind when selecting upgrades.

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