Maya Ellison
The Mazda MX-5 Miata NC is a budget sports car designed to showcase that a car doesn't need excessive horsepower to be enjoyable to drive. However, a car designed to live at the limit will be more prone to cooling issues. The weakest link in the NC cooling system is the plastic expansion tank, which is prone to early failure. This can cause the motor to overheat and fail. To combat this issue, some companies offer upgraded radiators and cooling systems, such as Mishimoto, which offers a Performance Aluminum Radiator with a lifetime warranty, and CSF, which offers a radiator for $349.
| Characteristics | Values |
|---|---|
| Radiator Material | Plastic/Aluminum combo |
| Radiator Life Expectancy | 10 years |
| Radiator Manufacturer | CSF |
| Radiator Price | $349 |
| Radiator Fit | Vehicles with manual transmissions |
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What You'll Learn
- The plastic expansion tank is prone to failure, compromising the cooling system
- Metal alternatives are available as replacements for plastic tanks
- The stock radiator is a plastic/aluminium combo with a 10-year lifespan
- All-metal radiators are available as an upgrade
- The Mishimoto radiator has a 114% increase in core volume and 51% increase in coolant capacity
The plastic expansion tank is prone to failure, compromising the cooling system
The Mazda MX-5 Miata is a budget sports car, designed to showcase that a driver doesn't need excessive horsepower to have fun behind the wheel. However, this means that the car is more prone to cooling issues. The plastic expansion tank is a weak link in the cooling system and is prone to early failure. This failure is due to the multiple heat cycles under pressure causing the bonded plastic halves to split. When the plastic expansion tank fails, the coolant system loses pressure, compromising the cooling system's efficiency. This can cause the motor to quickly overheat and fail before the owner has the opportunity to notice the small crack on the back of the plastic tank.
To prevent this, some opt for an aluminium coolant expansion tank. This is a direct replacement for the plastic tank and is constructed with internal baffles and a machined aluminium neck that takes a factory cap. The inlets and outlets are positioned to match up with the factory hoses. This aluminium alternative is also endorsed by Mazda Motorsports as a recommended part of the cooling system upgrades for all Spec MX-5 Race Cars.
For those who are serious about their car and want to do things right the first time, an aluminium tank is a good choice. It is a more expensive option, but it can prevent a potentially very expensive failure. Additionally, an upgraded radiator can help to future-proof the car and ensure that it can keep its cool even when running at its limit.
Overall, the plastic expansion tank's tendency to fail compromises the cooling system's efficiency and can lead to costly motor damage if not addressed promptly. Upgrading to an aluminium tank and radiator can provide a more reliable and efficient cooling system for the Miata MX5.
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Metal alternatives are available as replacements for plastic tanks
The stock radiator of the Miata MX5-NC is a plastic/aluminum combination, with a plastic tank that is crimped onto an aluminum radiator core. While plastic is a much cheaper material to use than metal, it is not the most durable option. The radiator tank is subjected to varying coolant temperatures, which can cause the plastic to quickly erode and develop holes. In addition, plastic does not efficiently exchange heat like metal, requiring the engine to work harder to cool itself.
For these reasons, metal alternatives are available as replacements for plastic tanks. CSF, for example, manufactures an all-metal radiator for the Miata MX5-NC. Metal tanks are more durable and efficient at exchanging heat than plastic tanks. A copper-brass radiator, for instance, can withstand the extreme heat that rushes into a radiator tank during a heat transfer exchange, resulting in faster cooling and higher efficiency. Copper-brass radiators also have fewer leaks and are easier to repair, resulting in less future maintenance and longer life.
While it is possible to repair a cracked plastic radiator tank using a radiator repair kit, it is a challenging process due to the high melting point of the nylon and the harsh operating conditions. In contrast, a copper-brass radiator can be easily repaired and welded, making it a more durable and cost-effective option in the long run.
Converting a plastic-aluminum radiator to a copper-brass application will provide a more durable radiator and save money in long-term repairs. Therefore, metal alternatives offer improved durability, efficiency, and heat exchange compared to plastic tanks, making them a worthwhile investment for the Miata MX5-NC.
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The stock radiator is a plastic/aluminium combo with a 10-year lifespan
The Mazda MX-5 Miata NC is a budget sports car, designed to showcase that a car doesn't need excessive horsepower to be enjoyable to drive. However, a car designed to live at the limit will be more prone to cooling issues. The stock radiator in the NC Miata is a plastic/aluminium combo, with a lifespan of around 10 years.
The plastic expansion tank in the NC cooling system is its weakest link, prone to early failure. When this happens, the coolant system loses pressure, compromising the cooling system's efficiency, which can lead to motor failure. This can be avoided by opting for a metal expansion tank, such as the METAL Moroso NC Miata Expansion Tank.
Upgraded radiators are also available for the NC Miata, which can be beneficial for those looking to track their car or add boost. The Mishimoto NC Miata radiator, for example, offers a significant increase in core volume, coolant capacity, and fin surface area, improving cooling efficiency. It is worth noting that this radiator is designed for vehicles with manual transmissions.
When considering radiator options, it is important to keep in mind the intended use of the vehicle and the level of performance desired. For those seeking to push their NC Miata to the limits, an upgraded radiator can provide peace of mind and help prevent cooling-related issues.
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All-metal radiators are available as an upgrade
The stock radiator in a Miata MX5-NC is a plastic/aluminium combo, which typically has a lifespan of around 10 years. While plastic is lightweight, it is a poor conductor of heat, and the cooling system is considered the weakest link in the NC system. This can lead to overheating and engine failure.
Another option is the 949Racing Crossflow Radiator, which is designed for Miata MX5s from 1989 to 2005. This radiator offers unmatched performance, with a longer transverse coolant path that allows more time to shed heat. The lightweight core will cool more efficiently than the Koyo 55mm, and it weighs about 40% less. The radiator also features a carefully optimised fin density and thickness to allow maximum cooling in a compact and lightweight unit.
When upgrading your Miata's cooling system, it is important to opt for a radiator with a good frontal surface area, as this enables the best possible heat dissipation. A tall, wide, and thin radiator is ideal, as a radiator that is too thick will build heat within itself.
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The Mishimoto radiator has a 114% increase in core volume and 51% increase in coolant capacity
The Mishimoto radiator is a high-quality, durable, and efficient radiator designed for the Mazda MX-5 Miata NC model years 2006 to 2015. It is constructed with aircraft-grade aluminium, featuring either a polished or natural finish. The radiator offers a significant improvement in cooling performance compared to the stock radiator, boasting a 114% increase in core volume and a 51% increase in coolant capacity.
The increased core volume in the Mishimoto radiator is achieved through advanced engineering and design, utilising 2-row or 3-row cores. This enhanced core design improves cooling efficiency and reduces engine temperatures, ensuring that the NC Miata can maintain optimal temperatures even when pushed to its limits. The additional rows of tubes and fins in the core provide a greater surface area for heat dissipation, allowing the radiator to effectively manage the additional heat generated by the engine's horsepower.
The 51% increase in coolant capacity further contributes to the radiator's superior cooling capabilities. By holding more coolant, the radiator can absorb and dissipate more heat, preventing overheating and ensuring the engine stays within safe operating temperatures. This is especially beneficial for high-performance driving conditions, such as prolonged track use, where the engine is subjected to increased stress and heat.
The Mishimoto radiator is designed as a direct-fit replacement for the stock radiator, ensuring seamless installation and compatibility with the vehicle's cooling system. It addresses the limitations of the stock radiator, which is prone to early failure due to plastic components that can crack and fail over time. With its all-aluminium construction, the Mishimoto radiator offers improved durability and peace of mind, backed by a lifetime warranty that includes accident protection.
Overall, the Mishimoto radiator's substantial increases in core volume and coolant capacity translate to enhanced cooling performance, making it an ideal upgrade for NC Miata owners seeking improved reliability and performance, especially in demanding driving scenarios.
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Frequently asked questions
The plastic expansion tank is the weakest link in the NC cooling system as it is prone to early failure. When the tank fails, the coolant system loses pressure and the cooling system efficiency is compromised, which causes the motor to quickly overheat and fail.
The stock radiator for the NC Miata MX5 is a plastic/aluminum combo, and 10 years is a reasonable life expectancy.
Some options for replacement radiators for the NC Miata MX5 include the CSF radiator, Mishimoto Performance Aluminum Radiator, and the METAL Moroso NC Miata Expansion Tank.
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