ProTek RC CR21 3-Port .21 Off-Road Engine (Turbo Plug) - PTK-2670

🏁 ProTek CR21 High Performance .21 1/8 Nitro Club Race Engine

Engine Overview:
The ProTek RC CR21 3-Port .21 Off-Road Nitro Engine is engineered for racers who want high performance without the high price tag. Ideal for club racing and smaller tracks, the CR21 delivers smooth, crisp power thanks to a redesigned crankshaft and lightweight piston. Sharing the same bore and stroke as the race-proven Samurai engines, the CR21 offers exceptional reliability and consistency—perfect for racers looking to elevate their performance on a budget.

The black 9-fin cooling head controls heat effectively even under demanding conditions, while the combustion chamber is optimized for strong low–to–mid-range power with impressive high-RPM capability. Inside, a chamfered knife-edge connecting rod reduces reciprocating mass for improved throttle response and top-end performance. The J3-1 carburetor provides precise tuning via three adjustable needles, and the included 6mm and 7mm inserts allow racers to fine-tune engine characteristics for changing conditions.

Features:

• Excellent option for off-road club racers
• Optimized for smaller and technical tracks
• Redesigned crankshaft & lightweight piston for smooth, crisp power delivery
• Black anodized 9-fin cooling head for efficient temperature management
• Includes ultra hot ProTek P3 Turbo Glow Plug
• Knife-edged connecting rod reduces mass & increases peak RPM
• 3-needle J3-1 carburetor for precise tuning
• Includes 6mm (Orange) and 7mm (Yellow) carb venturis

Specifications:

• Displacement: .21ci (3.49cc)
• Recommended Application: 1/8 Off-Road
• Bore: 0.641in (16.27mm)
• Stroke: 0.661in (16.80mm)
• Output: 2.41hp @ 33,000 RPM
• Porting: Intake: 2 / Exhaust: 1
• Practical RPM Range: 4,000–40,000
• Weight: 13.43oz (381g)

Recommended Exhaust:

• PTK-2060: ProTek R/C 2060 Tuned Pipe w/ Manifold
• PTK-2090: ProTek R/C 2090 Tuned Pipe w/ Manifold

Recommended Glow Plug:

• PTK-2542: ProTek R/C P3 Turbo Glow Plug (Ultra Hot)

Includes:

• (1) CR21 3-Port .21 Off-Road Engine
• (1) P3 Ultra Hot Turbo Glow Plug
• (1) Exhaust Gasket
• (1) 7mm Venturi
• (1) 6mm Venturi

🔎 Part Number

PTK-2670