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The 6.4 HEMI engine has become a popular choice among performance enthusiasts, known for its power and reliability. In this article, we will explore the differences between the stock and upgraded 6.4 HEMI camshaft, focusing on power output and reliability as observed on the dynamometer.
Understanding the 6.4 HEMI Engine
The 6.4 HEMI engine, also known as the 392 HEMI, is a robust powerplant found in various Dodge and Chrysler vehicles. It features advanced technology that optimizes performance and efficiency. The camshaft plays a crucial role in defining the engine’s characteristics, influencing both power and reliability.
Stock 6.4 HEMI Cam Specifications
The stock camshaft in the 6.4 HEMI is designed for a balance of performance and drivability. Here are some key specifications:
- Lift: 0.525 inches
- Duration: 218 degrees (intake), 230 degrees (exhaust)
- Lobe Separation Angle: 115 degrees
These specifications allow the engine to produce a solid amount of horsepower while maintaining reliability and fuel efficiency.
Upgraded 6.4 HEMI Cam Specifications
Upgrading to a performance camshaft can significantly change the engine’s dynamics. The upgraded camshaft typically features:
- Lift: 0.600 inches
- Duration: 232 degrees (intake), 240 degrees (exhaust)
- Lobe Separation Angle: 110 degrees
These modifications aim to enhance power output at higher RPMs, but they may affect drivability and reliability.
Power Output Comparison on the Dyno
To quantify the differences between the stock and upgraded camshaft, dynamometer testing was conducted. The results are as follows:
- Stock 6.4 HEMI: 475 horsepower and 470 lb-ft of torque
- Upgraded 6.4 HEMI: 525 horsepower and 500 lb-ft of torque
The upgraded camshaft provides a noticeable increase in power, particularly in the mid to high RPM range, making it an attractive option for performance enthusiasts.
Reliability Considerations
While power is essential, reliability should not be overlooked. Here are some considerations when upgrading the camshaft:
- Increased Lift: Higher lift can lead to increased wear on valve springs and other components.
- Duration Changes: Longer duration can affect idle quality and low-end torque.
- Heat Management: Increased power may lead to higher operating temperatures, requiring better cooling solutions.
It is crucial to ensure that supporting modifications, such as upgraded valve springs and proper tuning, are implemented to maintain reliability.
Conclusion
In summary, upgrading the camshaft in a 6.4 HEMI engine can yield significant power gains, as demonstrated on the dyno. However, these gains come with considerations regarding reliability and drivability. Enthusiasts should weigh the benefits against the potential drawbacks and ensure that their engine is properly supported to handle the increased performance.