Is it a Bad Idea to Install a Heavy V8 in Small Cars Like Miatas and RX-7’s?
Installing a heavy V8 engine into small cars like the Mazda Miata and RX-7 can be a polarizing choice, with many enthusiasts debating its merits and drawbacks. This article aims to provide a comprehensive overview of the advantages and disadvantages of such an upgrade.
Pros of Installing a V8 in Small Cars
Power Increase: V8 engines typically offer significantly more horsepower and torque compared to the original engines. This results in enhanced acceleration and performance, making small vehicles capable of tackling challenging tracks or streets with ease.
Tuning Potential: V8 engines often come with a wide array of aftermarket tuning options. These options allow for customization and performance enhancements, providing enthusiasts with the flexibility to fine-tune their rides to their specific preferences.
Durability: Many V8 engines are renowned for their robustness and reliability, potentially offering a longer lifespan compared to the original engines. This durability can be particularly appealing to owners who want a vehicle that stands the test of time.
Cons of Installing a V8 in Small Cars
Weight Distribution: V8 engines are generally heavier than their original counterparts. This can negatively impact the car's handling and balance, leading to understeer or oversteer in cornering situations. Balancing these engines requires careful consideration and often necessitates modifications to the suspension and chassis.
Structural Integrity: The chassis of small sports cars, such as the Miata and RX-7, may not be designed to handle the increased weight and power. This can lead to potential structural issues or excessive wear on components. Upgrading the chassis or reinforcing it with additional materials may be necessary to prevent damage.
Cooling and Space: Fitting a V8 into a small engine bay can be challenging, often requiring significant modifications to the cooling system, space constraints, and custom mounts. These modifications can be time-consuming and expensive, and may sometimes involve removing or modifying other components of the vehicle.
Legal and Insurance Issues
Local regulations and insurance policies can also play a role in a V8 swap. Depending on the engine used, these swaps may require inspections and could potentially affect insurance coverage. It is advisable to consult your local DMV or insurance provider to understand the potential legal and financial implications.
Conclusion
A V8 swap can be an exciting project that significantly boosts a vehicle's performance, but it requires careful consideration of the vehicle's design and intended use. Ensuring the proper modifications, such as weight distribution, suspension upgrades, and structural reinforcements, can transform a small car into a powerful performer. However, it is crucial to weigh the potential drawbacks and ensure that the modifications align with your goals for the vehicle.
While a V8 swap can be an excellent idea with the right engine, it is undoubtedly an extensive and expensive project. I have not seen what I would call a “done right” Miata/LS swap for under $6,000. Nathan Bradshaw's advice is the start of the complications you have to integrate or replace things such as engine control systems and fuel systems. Depending on the engine used, you will need to upgrade the suspension with new springs and other components to ensure optimal performance and safety.