How much power does a cam add to a 5.7 Hemi?
Upgrading the camshaft, or "cam", in a 5.7 Hemi engine can provide a significant boost in power output. Depending on the specific cam profile and other modifications, a cam swap on a 5.7 Hemi can add anywhere from 20 to 50 horsepower or more.
Understanding the Role of the Camshaft
The camshaft is a critical component in an internal combustion engine, as it controls the opening and closing of the intake and exhaust valves. The shape and timing of the cam lobes directly influence the engine's power, torque, and overall performance characteristics.
In a 5.7 Hemi engine, the factory camshaft is designed to provide a good balance of power, efficiency, and drivability for everyday use. However, enthusiasts often seek to extract more performance by upgrading to a more aggressive camshaft profile.
Factors Affecting Cam Upgrade Power Gains
The amount of power gained from a cam upgrade on a 5.7 Hemi can vary significantly depending on several factors:
- Cam Profile: The specific lift, duration, and timing of the cam lobes will have the biggest impact on power output. More aggressive cams with higher lift and longer duration tend to produce more power, but may also result in reduced low-end torque and drivability.
- Engine Modifications: Other engine upgrades, such as headers, intake, and tuning, can work in conjunction with the cam to maximize power gains. The more the engine is modified, the more potential power the cam upgrade can unlock.
- Compression Ratio: Higher compression ratios can allow the engine to take advantage of the increased airflow from a more aggressive cam, leading to greater power gains.
- Engine Displacement: Larger displacement 5.7 Hemi engines (e.g., 392 cubic inches) may see slightly higher power gains from a cam upgrade compared to smaller displacement variants.
It's important to note that while a cam upgrade can provide significant power gains, it may also require other complementary modifications to maintain drivability and reliability.
Typical Power Gains from a 5.7 Hemi Cam Upgrade
Based on the factors mentioned above, a typical cam upgrade on a stock or mildly modified 5.7 Hemi engine can result in the following power gains:
- Mild Cam: 20-30 horsepower increase
- Moderate Cam: 30-40 horsepower increase
- Aggressive Cam: 40-50 horsepower increase (or more with additional engine modifications)
It's always recommended to consult with a reputable engine builder or tuner to determine the best cam upgrade for your specific 5.7 Hemi engine and driving needs.
