Installing an M3 Camshaft in Your E30 M20: Step-by-step Guide and Expected Gains

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The BMW E30 M20 engine is a beloved choice among enthusiasts for its balance of performance and reliability. One of the most popular upgrades for this engine is the installation of an M3 camshaft. This article will guide you through the process of installing an M3 camshaft in your E30 M20, along with the expected performance gains.

Understanding the M3 Camshaft

The M3 camshaft is designed to increase airflow and improve engine performance. By replacing the stock camshaft with an M3 variant, you can expect better throttle response, increased horsepower, and enhanced torque across the RPM range.

Tools and Materials Needed

  • Socket set
  • Torque wrench
  • Camshaft alignment tool
  • New M3 camshaft
  • Gasket set
  • Engine oil
  • Cleaning supplies

Step-by-Step Installation Guide

Step 1: Prepare Your Workspace

Before you start, ensure that you have a clean and organized workspace. Gather all your tools and materials to streamline the process.

Step 2: Remove the Engine Cover

Begin by removing the engine cover. This will give you access to the camshaft and other components. Use your socket set to remove the bolts securing the cover.

Step 3: Disconnect the Necessary Components

Next, disconnect any components that obstruct access to the camshaft. This may include the throttle body, air intake, and various sensors. Keep track of all bolts and connectors for reassembly.

Step 4: Remove the Timing Belt or Chain

To access the camshaft, you will need to remove the timing belt or chain. Follow the manufacturer’s instructions for your specific engine to ensure proper removal.

Step 5: Remove the Old Camshaft

Once the timing belt or chain is removed, you can unbolt the old camshaft. Use your torque wrench to ensure you are following the correct specifications when removing the bolts.

Step 6: Install the M3 Camshaft

Carefully place the M3 camshaft into position. Make sure it is aligned correctly and secure it with the appropriate bolts. Use the torque wrench to tighten to the specified torque settings.

Step 7: Reinstall the Timing Belt or Chain

With the M3 camshaft in place, reinstall the timing belt or chain according to the manufacturer’s instructions. Ensure that everything is aligned properly to avoid any engine damage.

Step 8: Reconnect All Components

Reconnect all components that were removed earlier, including the throttle body and air intake. Ensure all connections are secure and that no bolts are left over.

Step 9: Replace the Engine Cover

Finally, replace the engine cover and secure it with the bolts. Make sure everything is in place before starting the engine.

Expected Gains from the Upgrade

Installing an M3 camshaft in your E30 M20 can lead to significant performance improvements. Here are some expected gains:

  • Increased horsepower: Expect gains of 10-20 horsepower, depending on supporting modifications.
  • Improved torque: Enhanced torque delivery, especially in the mid-range RPMs.
  • Better throttle response: A more responsive engine that feels lively and engaging.
  • Enhanced engine sound: A sportier exhaust note that many enthusiasts appreciate.

Conclusion

Installing an M3 camshaft in your E30 M20 is a rewarding project that can significantly enhance your driving experience. With the right tools and a bit of mechanical knowledge, you can achieve impressive performance gains. Always remember to follow proper procedures and specifications during installation for the best results.