O.S. Speed R21GT .21 On-Road Engine Combo w/T-2060SC Pipe (Turbo)

O.S. Speed R21GT .21 On-Road Engine Combo w/T-2060SC Pipe (Turbo)
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Price: $798.84

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The O.S. Speed R21GT .21 On-Road Engine Combo w/T-2060SC Tuned Pipe is a high performance engine designed for the 1/8 On-Road GT class. Performance has been improved across the board when compared to the previous 21 XZ-GT engine. The crankcase is designed off the R2101 and uses a five port intake and three port exhaust sleeve. The crankshaft and has been DLC coated with a counterweight like is found on other O.S. Speed engines. This engine uses a dual adjustment type carburetor that smoothly follows the rise for the corner, important for GT racing. The reducer is 7mm in accordance with IFMAR regulations. This combo includes the T-2060SC tuned pipe for crisp, smooth performance out of the box.


  • DLC coated crankshaft
  • 5 ports of scavenging + 3 ports of exhaust
  • 22E (B)GT carburetor with 7mm reducer
Stroke volume: 3.49cc (0.213 cu.in.)
Bore: 16.08mm (0.633in.)
Stroke: 17.20mm (0.677in.)
Output: 2.61hp (2.65ps) @ 34,000rpm
Practical rotation speed: 4,000-42,000 rpm
Weight: 369g (13.02oz)

  • (1) O.S. Speed R21GT .21 On-Road Engine
  • (1) O.S. T-2060SC Pipe
  • (1) O.S. Turbo Glow Plug
  • (1) Engine to Header Gasket
  • (1) 22E (B)GT Carburetor
  • (1) 7.0 mm Carburetor Reducer

This product was added to our catalog on September 13, 2021