Complete Guide to E30 M20 Camshaft Upgrades: from 130 Hp to 150+ Hp

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The BMW E30, known for its iconic design and spirited performance, has captured the hearts of enthusiasts worldwide. One of the most effective ways to enhance the performance of the E30 M20 engine is through camshaft upgrades. This guide will take you through the process of upgrading the camshaft to boost power from 130 hp to over 150 hp.

Understanding the M20 Engine

The M20 engine is a straight-six engine that was produced by BMW from 1977 to 1993. It is known for its smooth operation and potential for tuning. The stock configuration of the M20 produces around 130 hp, but with the right modifications, it can exceed 150 hp, particularly through camshaft upgrades.

Benefits of Upgrading the Camshaft

Upgrading the camshaft can significantly improve engine performance. Here are some of the main benefits:

  • Increased Horsepower: A performance camshaft can increase the engine’s horsepower output.
  • Improved Torque: Better torque delivery at various RPMs enhances drivability.
  • Enhanced Engine Response: A new camshaft can lead to quicker throttle response.
  • Better Sound: Performance camshafts can give your engine a more aggressive sound.

Choosing the Right Camshaft

When selecting a camshaft for the E30 M20 engine, consider the following factors:

  • Lift: Higher lift can improve airflow but may require additional modifications.
  • Duration: Longer duration can increase power at higher RPMs but may affect low-end torque.
  • Profile: The camshaft profile affects how the engine breathes; choose one that matches your performance goals.
  • Compatibility: Ensure that the camshaft is compatible with your engine and other modifications.

Several aftermarket camshaft options are available for the E30 M20 engine. Here are a few popular choices:

  • Schrick 292: Known for its high lift and duration, this camshaft is a favorite among enthusiasts.
  • Schrick 284: A good balance between performance and drivability, ideal for street use.
  • IE Stage 2: Offers a significant power increase with a focus on mid-range performance.
  • BMWE30.net Stage 1: A great option for those looking for a mild upgrade without sacrificing daily drivability.

Installation Process

Installing a new camshaft in the E30 M20 engine requires careful attention to detail. Follow these steps for a successful installation:

  • Gather Tools and Parts: Ensure you have all necessary tools and the new camshaft ready.
  • Remove Valve Cover: Take off the valve cover to access the camshaft.
  • Remove Timing Belt: Carefully remove the timing belt to free the old camshaft.
  • Replace Camshaft: Install the new camshaft, ensuring proper alignment with timing marks.
  • Reassemble: Reinstall the timing belt and valve cover, ensuring all bolts are torqued to specification.
  • Check Timing: Verify that the timing is correct before starting the engine.

Tuning After Installation

After installing a new camshaft, tuning the engine is crucial to maximize performance. Consider the following:

  • ECU Remapping: Adjust the engine’s ECU to accommodate the new camshaft’s characteristics.
  • Dyno Tuning: Use a dynamometer to fine-tune the engine for optimal performance.
  • Fuel Quality: Ensure you are using high-quality fuel to support increased power levels.

Common Issues and Troubleshooting

While upgrading the camshaft can provide significant performance gains, it may also lead to some issues. Here are a few common problems and their solutions:

  • Rough Idle: If the engine idles roughly, check the timing and ensure the camshaft is properly aligned.
  • Loss of Low-End Torque: A camshaft with too much duration may sacrifice low-end power; consider a milder cam.
  • Check Engine Light: If the check engine light comes on, perform a diagnostic check to identify any underlying issues.

Conclusion

Upgrading the camshaft in the E30 M20 engine can lead to impressive performance gains, transforming your driving experience. With careful selection, proper installation, and thorough tuning, you can elevate your E30’s horsepower from 130 hp to 150 hp or more. Whether you’re a seasoned enthusiast or a beginner, this guide provides the necessary steps to enhance your E30’s performance.