FX Engines K303 DLC .21 (3.5cc) 3-Port Off-Road Buggy Engine (Turbo Plug)

Precision 3-Port Off-Road Nitro Engine

This is the K303 DLC .21 (3.5cc) 3-Port Off-Road Buggy Engine from FX Engines. Designed for high-level 1/8 competition, this engine delivers powerful yet controllable performance across the entire RPM range. Its advanced internal design provides strong low-end torque, smooth midrange, and impressive top-end speed. Built with premium materials and race-proven engineering, it’s a top-tier choice for serious racers.

About the K303 Off-Road Nitro Engine

Optimized Flow And Power Delivery

The K303 features a black-coated crankcase engineered to maximize internal airflow and fuel efficiency. Refined internal passages reduce turbulence, allowing smoother fuel delivery and improved throttle control. This results in strong, consistent power from low-end acceleration to high RPM performance. The updated rear bearing further enhances durability for long-term racing reliability.

Instant Throttle Response And Fuel Precision

Equipped with a precision carburetor, this engine offers exceptional throttle response and tuning stability. The short needle design and optimized venturi ensure accurate fuel metering for clean and predictable power delivery. Strong midrange performance and smooth transitions make the engine easy to control on demanding tracks. This translates to improved confidence and faster lap times.

Reduced Friction And Maximum Efficiency

The DLC-coated, tungsten-balanced crankshaft minimizes internal friction while improving rotational stability. This advanced design enhances power transfer and extends the lifespan of critical components like the connecting rod and bearings. Combined with a precision-lapped piston and sleeve set, the engine maintains consistent performance under extreme racing conditions. The result is smoother operation and long-lasting reliability.

Features:

• 3-port sleeve design
• DLC-coated crankshaft
• Tungsten-balanced rotating assembly
• Precision-lapped piston and sleeve
• Black-coated high-flow crankcase
• High-performance carburetor design
• Strong low-end torque
• Smooth midrange power
• High RPM performance capability
• 9-rib lightweight cooling head