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The BMW 2002 is a classic icon known for its sporty design and engaging driving experience. One of the most popular modifications among enthusiasts is the M20 engine swap, which can significantly enhance the car’s performance without breaking the bank. In this article, we will explore how to achieve over 150 horsepower with an M20 engine swap for under $4,000.
Understanding the BMW 2002
The BMW 2002 was produced from 1968 to 1976 and is part of the BMW 2 Series. It is renowned for its lightweight chassis and rear-wheel-drive layout, making it a favorite among driving enthusiasts. However, the stock engines can leave some drivers wanting more power. This is where the M20 engine comes into play.
Why Choose the M20 Engine?
The M20 engine, a 2.0L inline-six, was used in various BMW models from the late 1970s to the early 1990s. Here are some reasons why it is an excellent choice for the BMW 2002:
- Powerful Performance: The M20 engine can produce over 150 horsepower, providing a significant boost compared to the original engines.
- Availability: The M20 is relatively easy to find in junkyards or through online marketplaces, making it accessible for enthusiasts.
- Cost-Effective: The total cost of the swap can remain under $4,000, including parts and labor.
Components Needed for the Swap
To successfully complete the M20 engine swap, you’ll need several key components. Here’s a list of what you should gather:
- M20 Engine with Transmission
- Engine Mounts
- Wiring Harness and ECU
- Exhaust Header
- Radiator and Cooling System
- Fuel System Upgrades
- Driveshaft Modifications
- Miscellaneous Hardware and Tools
Step-by-Step Engine Swap Process
Preparation
Before starting the swap, ensure you have a clean workspace and all necessary tools. It’s also advisable to have a second set of hands available for assistance.
Removing the Old Engine
Begin by disconnecting the battery and draining the fluids. Remove the old engine by following these steps:
- Detach the wiring harness.
- Remove the exhaust system.
- Disconnect the fuel lines.
- Unbolt the engine mounts.
- Lift the engine out of the engine bay.
Installing the M20 Engine
Once the old engine is out, it’s time to install the M20. Follow these steps:
- Position the M20 engine in the engine bay.
- Secure the engine mounts.
- Connect the wiring harness and ECU.
- Install the exhaust header.
- Reattach the fuel lines and cooling system.
Finalizing the Installation
After the M20 engine is secured, complete the installation by:
- Connecting the driveshaft.
- Reinstalling the radiator.
- Filling the engine with oil and coolant.
- Reconnecting the battery.
Tuning and Testing
After the installation, it’s crucial to tune the engine for optimal performance. This can include adjusting the fuel mixture and ignition timing. Once tuned, perform a test drive to ensure everything is functioning correctly.
Cost Breakdown
Here’s a rough breakdown of the costs associated with the M20 engine swap:
- M20 Engine with Transmission: $1,500
- Engine Mounts: $200
- Wiring Harness and ECU: $300
- Exhaust Header: $400
- Radiator and Cooling System: $300
- Fuel System Upgrades: $500
- Miscellaneous Hardware: $300
Total Estimated Cost: $3,800
Conclusion
Swapping the M20 engine into a BMW 2002 is a rewarding project that can significantly enhance performance while staying within budget. With careful planning and execution, you can enjoy a classic car with modern power. Happy wrenching!