Na Miata B16a or B20 Swap: Power Gains, Installation Tips, and Budget Considerations

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The NA Miata is a beloved platform for car enthusiasts, known for its lightweight and nimble handling. However, many owners seek to enhance performance through engine swaps. The B16A and B20 engines from Honda are popular choices for their power and reliability. This article will explore the power gains, installation tips, and budget considerations for swapping a B16A or B20 engine into an NA Miata.

Power Gains from B16A and B20 Swaps

Swapping a B16A or B20 engine into an NA Miata can significantly boost power and performance. Here’s a breakdown of what you can expect:

  • B16A Engine: The B16A typically produces around 160 horsepower and 111 lb-ft of torque. This represents a substantial increase over the stock NA Miata engine, which produces about 116 horsepower.
  • B20 Engine: The B20 engine, while slightly heavier, offers more torque, typically around 145 lb-ft, making it a great option for those looking for low-end power.

Both engines provide a noticeable improvement in acceleration and overall driving experience. The choice between the two often comes down to personal preference and driving style.

Installation Tips for B16A and B20 Swaps

Successful engine swaps require careful planning and execution. Here are some tips to ensure a smooth installation:

  • Research Compatibility: Ensure that the engine mounts, transmission, and wiring harness are compatible with your NA Miata. You may need to source custom mounts or adapters.
  • Gather Tools and Equipment: Have all necessary tools ready, including an engine hoist, wrenches, and sockets. Consider renting specialized tools if needed.
  • Follow a Guide: Utilize online forums, videos, and guides specific to Miata swaps. They provide valuable insights and troubleshooting tips.
  • Plan for Wiring: The B16A and B20 engines will require modifications to the wiring harness. Be prepared to splice wires and connect sensors properly.
  • Cooling System: Ensure that the cooling system is adequate for the new engine, as it may require an upgraded radiator or additional cooling components.

By following these tips, you can streamline the installation process and minimize potential issues.

Budget Considerations for Engine Swaps

Budgeting for an engine swap can be challenging, as costs can vary widely based on parts, labor, and additional modifications. Here are some factors to consider:

  • Engine Cost: Expect to pay between $1,500 to $3,000 for a B16A or B20 engine, depending on condition and mileage.
  • Labor Costs: If you’re not doing the swap yourself, labor costs can range from $500 to $2,000, depending on the shop and complexity of the swap.
  • Additional Parts: Factor in costs for engine mounts, transmission adapters, wiring harness modifications, and any necessary cooling upgrades, which can add another $500 to $1,500.
  • Unexpected Expenses: Always set aside a contingency budget for unforeseen issues that may arise during the installation process.

By carefully planning your budget and considering all potential expenses, you can avoid surprises and ensure a successful engine swap.

Conclusion

Swapping a B16A or B20 engine into an NA Miata can transform the car into a more powerful and enjoyable driving experience. With careful planning, proper installation techniques, and a clear understanding of the budget, enthusiasts can achieve their performance goals. Whether you choose the high-revving B16A or the torque-rich B20, each option offers unique benefits that can enhance your Miata’s performance.