Mishimoto Performance Radiator Cap - Small, 1.3 Bar

This high-pressure radiator cap from Mishimoto raises the boiling point of the engine coolant to p...

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Demon TweeksMishimoto High-Pressure 1.3 Bar Radiator Cap Small - Black, Black
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£22.80
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eBayMishimoto Performance Small High-Pressure 1.3 Bar Radiator Cap - MMRC-13-SM
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Product Information

Full details

This Mishimoto Performance Radiator Cap is designed for automotive enthusiasts looking to enhance their engine's cooling system efficiency. It raises the boiling point of coolant, providing a safer operating temperature and preventing overheating under demanding conditions. A key caveat is its specific fitment for 31-32mm fill necks. Key features include its high-pressure design, durable construction, and easy installation.

All features

Model Part NumberMMRC-13-SM
BrandMishimoto

Extended Product Information

FAQs

What does a 1.3 Bar pressure rating mean?

A 1.3 Bar (approximately 18.8 PSI) rating means the cap is designed to hold pressure in the cooling system up to 1.3 Bar before releasing excess pressure. This higher pressure raises the boiling point of the coolant.

Will this cap fit any car?

No, this cap is specifically designed for radiators with a 31-32mm fill neck. Always verify your vehicle's radiator neck size before purchasing.

How often should I replace my radiator cap?

It's recommended to inspect your radiator cap during routine maintenance (e.g., oil changes). Replace it if you notice any signs of wear, damage, or if it's over 5 years old, or if the vehicle manufacturer recommends a replacement interval.

Can a higher pressure cap cause damage?

A higher pressure cap can be beneficial but requires the rest of the cooling system (radiator, hoses, etc.) to be in good condition and able to handle the increased pressure. Ensure your system is sound before installing a higher-pressure cap.

How does raising the boiling point help?

Raising the boiling point of coolant means it can operate at higher temperatures without turning into steam. Steam is less effective at transferring heat, so preventing boiling improves the cooling system's efficiency and reduces the risk of overheating.

Is installation difficult?

Installation is typically straightforward and requires no special tools. It's a direct replacement for the stock radiator cap, provided the fill neck size is compatible.

Troubleshooting

Radiator cap won't seal properly

Ensure the radiator fill neck is clean and free of debris. Verify that you have the correct cap size (31-32mm) for your application. Check the cap's rubber seal for any damage.

Coolant overheating despite new cap

The radiator cap is only one component of the cooling system. Check the radiator, thermostat, water pump, and cooling fans for proper operation. Ensure the coolant level is correct and the system is properly bled of air.

Visible signs of corrosion on the cap

While designed for corrosion resistance, severe conditions may cause minor surface discoloration. Clean the cap and inspect for any compromise to the sealing surfaces. If significant corrosion is present, replacement is recommended.

Pros and Cons

Pros

  • Improves engine cooling efficiency
  • Raises coolant boiling point, preventing overheating
  • Durable and long-lasting construction
  • Easy to install as a direct replacement
  • Suitable for high-performance and modified vehicles

Cons

  • Specific fill neck size requirement (31-32mm)
  • May not be suitable for all stock vehicles without modifications
  • Higher pressure might require other cooling system components to be in good condition

Setup, Compatibility & Care

Setup: Ensure the engine is completely cool before attempting to remove the old radiator cap. To install, simply align the new Mishimoto cap with the fill neck and press down while turning clockwise until it locks into place. Verify it is securely fastened.

Compatibility: This radiator cap is specifically designed for vehicles with a 31-32mm radiator fill neck size. Always confirm your vehicle's radiator neck diameter before purchasing. It is intended as an upgrade for performance-oriented cooling systems.

Care: Periodically inspect the radiator cap for signs of wear, damage, or corrosion. Clean the sealing surfaces on both the cap and the radiator neck with a damp cloth to ensure a proper seal. Avoid using abrasive cleaners.

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