O.S. Engine OS-1A203 Speed B2101-TY Limited Edition Engine with T2090-TY Silencer  [OS-1A203]

O.S. Engine OS-1A203 - O.S. Speed B2101-TY w/T2090-TY Header and Silencer
Price:
£400.13
Brand:
O.S. Engine
Model:
OS-1A203
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Performance and Precision in the O.S. Engine OS-1A203 Speed B2101-TY Package

Designed for competitors who need reliable response and controllable power, the O.S. Engine OS-1A203 mated to the Speed B2101-TY and T2090-TY silencer brings consistent acceleration and refined throttle control to race setups.

What the Numbers Mean on Track

The Speed B2101-TY carries a displacement of 3.46cc and an advertised output of 2.61hp at 34,000 RPM, operating smoothly from around 4,000 up to 42,000 RPM. Precision engraving on the crankcase and crankshaft underlines manufacturing focus on balance and component fitment.

Exclusive Restrictor and Matched Exhaust for Tuned Torque

This model includes a bespoke 5.8mm carb restrictor originally developed for Ty Tessmann's championship configuration to refine air flow and boost usable torque. Together with the T2090-TY muffler and M2002SC manifold, it produces strong low to mid-range drive that helps on tight, technical circuits.

Specifications

  • Displacement: 0.211 cu in (3.46cc)
  • Bore: 0.646" (16.4mm)
  • Stroke: 0.646" (16.4mm)
  • Practical RPM: 4,000-42,000 RPM
  • Output: 2.61hp @ 34,000RPM
  • Weight: 12.42oz (352g)
  • Mounting Hole Centers (Same Side): 0.83" (21mm)
  • Mounting Holes (Opposite Side): 1.4" (37mm)
  • Height (Bottom of Mounting Tabs/Top of Cylinder Head): 3.2" (82.6mm)
  • Width of Mounting Tabs: 1.8" (45mm)
  • Distance from Backplate to Front Bearing: 2.5" (64.5mm)
  • Crankshaft Size: UNF1/4-28
  • Crankshaft Length: 1.2" (29.5mm) outside of engine
  • Carburetor Settings: Preset at factory, minimal adjustments needed

The O.S. Engine OS-1A203 Speed B2101-TY is aimed at seasoned racers who want a ready-to-race nitro engine with a focused torque curve and factory-matched exhaust hardware.

Is this engine suitable for endurance events?

It can be used in endurance settings if you manage mixture and cooling carefully; monitor temperatures and service intervals during long runs to protect internals.

How often should I inspect the restrictor and manifold?

Check the restrictor and manifold after several runs for deposits or loosening; a quick clean and torque check will prevent performance drift.

What temperature range is normal during tuning?

During break-in and tuning expect moderate head and glow temperatures; follow O.S. guidance and avoid prolonged high-RPM runs until the engine is fully bedded in.

Can I use this engine on multiple chassis types?

Yes, it fits common 1/8 scale mounting patterns but confirm overall length and header routing for each chassis to ensure correct fit and clearance.

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