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The RX-7 is a beloved sports car known for its lightweight design and agile handling. However, many enthusiasts have turned to the LS engine swap to enhance performance and reliability. In this article, we will explore the reliability of the RX-7 LS swap, focusing on cast iron LS blocks and high-quality drivetrain components to ensure longevity.
Understanding the LS Engine Swap
The LS engine series, developed by General Motors, is renowned for its robust performance and reliability. When swapping an LS engine into an RX-7, several factors must be considered to maximize the longevity of the setup.
Benefits of Cast Iron LS Blocks
Cast iron LS blocks offer several advantages over aluminum blocks, particularly for performance applications.
- Durability: Cast iron blocks are more resistant to cracking and warping under high stress.
- Heat Retention: They retain heat better, which can help with engine efficiency.
- Weight Considerations: Although heavier, the added weight can improve traction in rear-wheel-drive applications.
Selecting High-Quality Drivetrain Components
The drivetrain is critical in ensuring that the power from the LS engine is effectively transferred to the wheels. High-quality components can significantly enhance the reliability of the swap.
Transmission Options
Choosing the right transmission is essential for handling the power of an LS engine. Here are some popular options:
- TH400 Transmission: Known for its strength and reliability, this three-speed automatic can handle high horsepower applications.
- T56 Transmission: A six-speed manual that offers excellent gear ratios and durability, making it a favorite among enthusiasts.
- 4L60E Transmission: A versatile automatic option that can be built to handle increased power levels.
Driveshaft and Differential
Upgrading the driveshaft and differential is crucial for handling the increased torque from the LS engine. Consider the following:
- Aluminum Driveshaft: Lightweight and strong, it reduces rotational mass and improves acceleration.
- Limited-Slip Differential: Enhances traction and stability during acceleration and cornering.
- Upgraded Axles: Ensure they can handle the added power without failure.
Cooling System Enhancements
Proper cooling is vital for the longevity of any engine, especially when swapping in a powerful LS engine. Here are some tips for enhancing your RX-7’s cooling system:
- High-Performance Radiator: Upgrade to a larger, more efficient radiator to keep temperatures in check.
- Electric Fans: Consider installing electric fans for improved airflow and cooling efficiency.
- Oil Cooler: Adding an oil cooler can help maintain optimal oil temperatures, especially during spirited driving.
Regular Maintenance Practices
To ensure the longevity of your RX-7 LS swap, regular maintenance is key. Here are some essential practices:
- Oil Changes: Regularly change the oil and filter to keep the engine running smoothly.
- Fluid Checks: Regularly check and replace coolant, transmission fluid, and differential fluid as needed.
- Inspection: Periodically inspect all components for wear and tear, especially after heavy use.
Conclusion
Swapping an LS engine into an RX-7 can significantly enhance performance, but it requires careful consideration of components and maintenance practices to ensure reliability and longevity. By utilizing cast iron LS blocks and high-quality drivetrain components, enthusiasts can enjoy their RX-7 with confidence for many years to come.