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The 4G63 engine, renowned for its performance in the Mitsubishi Eclipse and other models, is a favorite among tuners and enthusiasts alike. Upgrading the head and camshaft of this engine is essential for achieving peak performance, especially when aiming for over 600 horsepower. This article delves into the specifics of head and camshaft upgrades, providing crucial insights for those looking to maximize their 4G63’s potential.
Understanding the 4G63 Engine
The 4G63 is a 2.0-liter inline-four engine that has gained a reputation for its robust design and tunability. Originally designed for turbocharging, the engine features a DOHC (Dual Overhead Camshaft) layout, which allows for improved airflow and performance. To reach 600+ horsepower, however, significant modifications are necessary, particularly in the head and camshaft areas.
Benefits of Upgrading the Head
The cylinder head is critical in determining an engine’s performance. Upgrading the 4G63’s head can lead to significant improvements in airflow, combustion efficiency, and overall power output. Here are some of the key benefits:
- Improved Airflow: A performance head can increase the volume of air entering the engine, which is essential for high horsepower builds.
- Better Combustion: Enhanced combustion chamber designs can lead to more efficient fuel burning, resulting in increased power.
- Increased Durability: Upgraded materials can withstand higher pressures and temperatures, making the engine more reliable at high power levels.
Choosing the Right Head for Your Build
When selecting a head for your 4G63, consider the following factors:
- Flow Bench Testing: Look for heads that have been tested for airflow to ensure they meet your performance needs.
- Material Quality: Choose heads made from high-quality aluminum or iron for better heat dissipation and strength.
- Porting Options: Some heads come pre-ported, while others may require custom porting to maximize airflow.
Camshaft Upgrades for Maximum Performance
Alongside the head, the camshaft plays a pivotal role in the performance of the 4G63. Upgrading the camshaft can drastically alter the engine’s characteristics, allowing it to produce more power at higher RPMs. Here’s what to consider:
- Duration: Longer duration camshafts allow for more airflow but may sacrifice low-end torque.
- Lift: Higher lift camshafts can improve airflow but require compatible springs and retainers.
- Overlap: The right overlap can enhance performance at high RPMs, especially in turbocharged applications.
Selecting the Right Camshaft
Choosing the right camshaft is crucial for achieving your desired horsepower goals. Consider these tips:
- Intended Use: Determine if your car will be used for daily driving, racing, or a mix of both to select an appropriate cam profile.
- Compatibility: Ensure that the camshaft is compatible with other engine components, including the head and valvetrain.
- Manufacturer Reputation: Opt for camshafts from reputable manufacturers known for quality and performance.
Installation Considerations
Installing a new head and camshaft requires careful planning and execution. Here are some key considerations:
- Professional Help: If you’re not experienced, consider hiring a professional to ensure proper installation and tuning.
- Supporting Modifications: Upgrading the head and camshaft often necessitates other modifications, such as upgraded fuel injectors, a better turbocharger, and improved intercooling.
- Tuning: After installation, a proper tune is essential to maximize performance and ensure engine reliability.
Conclusion
Upgrading the 4G63’s head and camshaft is a critical step for those looking to achieve peak performance at 600+ horsepower. By understanding the benefits, making informed choices, and considering installation factors, enthusiasts can unlock the full potential of this legendary engine. Whether for street racing or track performance, these upgrades can transform the 4G63 into a powerhouse.