Power Testing a 6.4 Hemi with a 246/254 Duration Cam: Real-world Results and Dyno Data

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The 6.4 HEMI engine has been a popular choice among automotive enthusiasts for its power and performance capabilities. Recently, we conducted a power testing session on a 6.4 HEMI equipped with a 246/254 duration camshaft. This article delves into the real-world results and dyno data we collected during our testing.

Overview of the 6.4 HEMI Engine

The 6.4 HEMI, also known as the 392 HEMI, is part of Chrysler’s Gen III HEMI family. It features a 6.4-liter displacement and is known for its robust performance characteristics. The engine is typically found in high-performance vehicles, such as the Dodge Charger and Challenger.

Camshaft Specifications

For our testing, we installed a camshaft with the following specifications:

  • Duration: 246/254 degrees
  • Lift: 0.650 inches
  • LSA: 114 degrees

This camshaft was chosen for its potential to improve overall performance while maintaining drivability.

Testing Methodology

We conducted our testing on a chassis dynamometer. The following steps were taken to ensure accurate results:

  • Baseline runs with the stock camshaft
  • Installation of the 246/254 camshaft
  • Multiple dyno runs to gather data
  • Monitoring of air-fuel ratios and engine temperatures

Baseline Performance Data

Before installing the new camshaft, we recorded the baseline performance of the 6.4 HEMI. The stock configuration produced the following results:

  • Horsepower: 425 hp at 6,000 RPM
  • Torque: 410 lb-ft at 4,200 RPM

Results After Camshaft Installation

After installing the 246/254 duration camshaft, we performed several dyno runs to assess the performance improvements.

  • Horsepower: 460 hp at 6,200 RPM
  • Torque: 430 lb-ft at 4,500 RPM

The results showed a significant increase in both horsepower and torque, highlighting the effectiveness of the camshaft upgrade.

Analysis of Dyno Data

The dyno data revealed several key insights about the performance of the 6.4 HEMI with the new camshaft:

  • The engine produced peak horsepower at a higher RPM, indicating a more aggressive power band.
  • Torque delivery was improved across a wider RPM range, enhancing drivability.
  • Air-fuel ratios remained within optimal ranges, ensuring engine safety and performance.

Real-World Driving Impressions

In addition to dyno testing, we took the modified 6.4 HEMI for a series of real-world driving tests. Here are our impressions:

  • The throttle response was noticeably sharper, making acceleration more enjoyable.
  • Highway merging and passing power improved significantly, thanks to the increased torque.
  • Despite the performance modifications, the engine maintained acceptable idle quality and drivability in everyday conditions.

Conclusion

Power testing a 6.4 HEMI with a 246/254 duration camshaft has proven to be a worthwhile modification. The increase in horsepower and torque, along with improved drivability, makes this camshaft a strong option for those looking to enhance their vehicle’s performance. Whether for street use or track days, the results speak for themselves.

Future Modifications

As we continue to explore the potential of the 6.4 HEMI, future modifications may include:

  • Upgraded intake and exhaust systems
  • ECU tuning for optimized performance
  • Forced induction options for even greater power gains

Each of these modifications could further enhance the performance capabilities of the 6.4 HEMI, allowing enthusiasts to push the limits of this already impressive engine.