CSF Radiator 42mm 2 Row Aluminum Core B Tube 16-18 Focus RS

CSF radiator 42mm 2-row aluminum core delivers improved cooling capacity for the 2016–2018 Focus RS, providing a thicker core and increased fluid capacity that drastically improves the amount of heat the system can absorb and dissipate.

This radiator is engineered specifically to raise cooling performance and reliability under demanding driving conditions. CSF's reputation for motorsports-grade cooling solutions is reflected in the design choices focused on heat transfer and fluid management.

• 42mm 2-row aluminum core — A thicker, two-row core increases coolant volume and surface area, which improves the system’s ability to absorb and shed heat during sustained high-load operation.
• Second cooling row — Adds additional coolant passage area to lower peak temperatures and reduce thermal cycling on the engine cooling system.
• Increased fluid capacity — Greater coolant volume stabilizes temperatures and extends time-to-overheat during heavy use.
• CSF Exclusive B-Tube Technology — Enhances heat transfer efficiency; CSF reports an increase in heat transfer by approximately 15.

Materials and construction are focused on functional performance: the aluminum core balances thermal conductivity with weight considerations for improved responsiveness of the cooling system. Each feature is selected to support sustained thermal control, making this radiator appropriate for performance driving and applications where the factory core reaches its limits.

Benefits at a glance

• Improved heat absorption and dissipation for more consistent operating temperatures.
• Reduced risk of overheating during prolonged or aggressive driving.
• Enhanced durability of the cooling system through reduced thermal stress.

Recommended application

Directly replaces the factory radiator on 2016–2018 Ford Focus RS models to provide a significant cooling upgrade without requiring unspecified modifications.