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The RX-7 is a beloved sports car known for its lightweight design and exceptional handling. When swapping in a high-performance LS engine, ensuring adequate cooling is crucial to maintain performance and reliability. In this article, we will explore the best cooling solutions for an RX-7 LS swap.
Understanding Cooling Needs
When upgrading to an LS engine, the cooling requirements change significantly. The LS engine produces more power and generates more heat than the original RX-7 rotary engine. Therefore, an efficient cooling system is essential to prevent overheating and ensure optimal performance.
Radiator Options
Choosing the right radiator is one of the most important decisions for cooling an LS-swapped RX-7. Here are some top options:
- Aluminum Radiators: Lightweight and efficient, aluminum radiators provide excellent heat dissipation. Brands like Mishimoto and Griffin offer high-performance options specifically designed for LS swaps.
- LS Swap-Specific Radiators: Some manufacturers create radiators specifically for LS swaps in RX-7s, ensuring proper fitment and optimal cooling capacity.
- Dual Pass Radiators: These radiators allow coolant to flow through the radiator twice, increasing cooling efficiency. They are ideal for high-performance applications.
Fans and Fan Shrouds
Efficient airflow is crucial for maintaining optimal operating temperatures. Here are some fan and shroud options:
- Electric Fans: Electric fans are popular for their efficiency and ability to free up engine power. Brands like Spal and Derale offer powerful options that can be easily mounted in the RX-7.
- Fan Shrouds: A properly designed fan shroud can significantly improve cooling efficiency by directing airflow through the radiator. Consider custom shrouds to fit your specific setup.
- Dual Fan Setup: Installing two electric fans can provide additional cooling capacity, especially during high-performance driving or track days.
Coolant Types and Additives
The type of coolant used can have a significant impact on cooling efficiency. Here are some recommendations:
- High-Performance Coolants: Consider using a high-performance coolant designed for racing applications. These coolants often have a higher boiling point and better heat transfer properties.
- Water Wetter Additives: Adding water wetter or similar products can improve heat transfer and reduce coolant temperatures.
- Distilled Water: Mixing distilled water with coolant can enhance cooling performance, as distilled water has better thermal conductivity than standard tap water.
Cooling System Upgrades
In addition to radiators and fans, consider the following upgrades to enhance your cooling system:
- Upgraded Water Pump: An aftermarket water pump can improve coolant flow and enhance cooling efficiency. Look for pumps designed for LS engines.
- Thermostats: A lower temperature thermostat can help keep engine temperatures in check, especially during high-performance driving.
- Cooling Hoses: Upgrading to high-quality silicone hoses can improve durability and performance in the cooling system.
Conclusion
Swapping an LS engine into an RX-7 can create an incredible performance vehicle, but it requires careful consideration of the cooling system. By selecting the right radiator, fans, coolant, and upgrades, you can ensure your RX-7 stays cool under pressure. Implement these best cooling solutions to maximize your LS swap’s performance and reliability.