Koyorad High-Pressure Racing Radiator Cap

Koyorad High-Pressure Racing Radiator Cap (1.3 Bar)

Maximize the cooling efficiency of your performance machine with the Koyorad Hyper Cap (SK-C13). Engineered specifically for high-stress environments, this racing-spec radiator cap is designed to extract every ounce of performance from your cooling system. Koyorad highly recommends this 1.3 bar cap for use with all Koyorad All-Aluminum Racing Radiators to ensure consistent pressure regulation and peak thermal management.

Manufactured in Japan using premium-grade components, the Hyper Cap combines rugged durability with a professional aesthetic, providing both the technical "toughness" required under the hood and a clean, elegant finish.

Why Upgrade to a High-Pressure Cap?

The physics are simple: Increasing the pressure of your coolant directly raises its boiling point. While most factory cooling systems are equipped with a standard 0.9 Bar cap, the Koyorad Hyper Cap is rated at 1.3 Bar. This upgrade increases the boiling temperature of your coolant to 267.8°F, providing a significant safety margin over the standard boiling point of water.

Performance Benefits 

• Increased Heat Capacity: Raising the boiling point allows your cooling system to absorb and dissipate more heat before boil-over occurs.
• Optimized Cooling Efficiency: Higher pressure prevents localized boiling within the engine head, ensuring constant coolant-to-metal contact.
• Racing Specification: Designed to withstand an open-valve pressure rating of 1.3kg/cm², making it ideal for competitive track use and high-performance street builds.
• Superior Construction: Made in Japan to the highest quality standards to ensure long-term reliability under extreme temperatures.

Specification & Fitment

• Part Number: SK-C13
• Pressure Rating: 1.3 Bar (1.3kg/cm²)
• Compatibility: Optimized for Koyorad All-Aluminum Racing Radiators
• Build Quality: Automotive-grade stainless steel and high-temp silicone seals.

by Turn 14