O.S.SPEED R21GT II

The O.S. Speed R21GT II is a high-performance nitro engine designed for 1/8 GT racing cars, offering enhanced power and efficiency for competitive racing.

Key Features:

• Displacement: 3.49 cc (0.213 cu.in.)
• Bore: 16.08 mm (0.633 in.)
• Stroke: 17.20 mm (0.677 in.)
• Output: 2.65 PS (2.61 HP) at 34,000 RPM
• Practical RPM Range: 4,000 to 42,000 RPM
• Weight: 362 grams (12.77 oz.)

Design and Performance Enhancements:

• Crankshaft: Features two tungsten counterweights with optimized mass balance for improved performance.
• Inner Head: Redesigned to enhance low and medium speed response and improve idling stability; includes an O-ring to reduce vibration and enhance dust resistance.
• Outer Head: Lightened with machined fins to improve cooling efficiency and reduce overall weight.
• Ports Configuration: Equipped with five scavenging ports and three exhaust ports, compliant with IFMAR regulations.
• Carburetor: Utilizes a double-adjust type 22E (B) GT carburetor with a 7.0 mm (red) aluminum venturi for precise fuel mixture control.

Standard Accessories:

• Glow Plug: RP7
• Venturi: 7.0 mm (Red) AL2
• Exhaust Seal Ring
• Dust Cap Set: (φ3, φ16, φ18)

This engine is engineered to deliver exceptional power and reliability, making it a preferred choice for RC enthusiasts seeking superior performance in 1/8 GT class racing.