Here's why:
* Engine bay space: The RX-7's engine bay was specifically designed for the rotary engine. It's a tight fit, and swapping in a larger, heavier engine would require significant modifications.
* Drivetrain compatibility: The RX-7's transmission and axles are designed for the rotary engine's torque characteristics. A different engine would likely require a whole new drivetrain.
* Electronics and emissions: The RX-7's ECU and wiring are designed for the rotary engine. Swapping in a different engine would require a complete rewire and potentially new electronics.
Practical options:
* Larger Rotary: The most common engine swap is to a larger rotary engine, like the 13B-REW from a later RX-7 or a 20B from a Mazda Cosmo.
* Modern Rotary: You could potentially swap in a new-generation Renesis rotary engine. This would require significant work and may not be legal in some areas.
Things to consider:
* Cost: Engine swaps are complex and expensive.
* Legality: Modifying the engine in your RX-7 could affect its legal status and emissions compliance.
* Complexity: Swapping a different engine requires a lot of specialized knowledge and skills.
If you're looking for more power, the best option is to upgrade the existing rotary engine or find a 13B-REW engine from a later RX-7. If you're set on a different engine, you'll need to find a skilled mechanic who can handle the complex swap.
