How Much Power Does A Cam Add

How Much Power Does a Camshaft Add? A Deep Dive into Performance Gains

Adding a performance camshaft is a popular modification among car enthusiasts looking to boost their engine's power output. But the question on everyone's mind is: how much power does a cam actually add? The answer, unfortunately, isn't a simple number. The power gains from a camshaft upgrade depend on a variety of factors, and understanding these factors is crucial before making this modification.

Factors Affecting Power Gains from a Camshaft

Several key elements determine the horsepower and torque increase (or sometimes decrease!) you can expect from a new camshaft:

1. The Camshaft Itself:

• Duration: This refers to the amount of time the valve stays open. Longer duration cams generally allow for more air intake, potentially leading to higher horsepower at higher RPMs. However, this can also reduce low-end torque.
• Lift: This measures how far the camshaft opens the valves. Greater lift allows for more airflow, again potentially increasing horsepower, especially at higher RPMs.
• Overlap: This is the period when both the intake and exhaust valves are open simultaneously. It can improve breathing efficiency but can also reduce low-end torque and potentially cause some exhaust reversion issues.
• Lobe Separation Angle (LSA): This affects the timing of the valve events. A narrower LSA generally increases power at higher RPMs, while a wider LSA can improve low-end torque.

Choosing the right cam profile is critical, as it needs to match your engine's displacement, intended use, and other modifications. A camshaft designed for high RPM racing will likely not be ideal for a daily driver.

2. The Engine Itself:

• Engine Type: Naturally aspirated engines will respond differently than turbocharged or supercharged engines. A camshaft designed for a naturally aspirated engine may not optimize a forced induction setup.
• Engine Displacement: Larger engines generally have more potential for power gains than smaller engines.
• Compression Ratio: Higher compression ratios can benefit from more aggressive cam profiles but may require other modifications to prevent detonation.

3. Supporting Modifications:

The camshaft isn't an isolated component. Its effectiveness is heavily influenced by other modifications. To realize the cam's potential, consider these:

• Headers and Exhaust: A restrictive exhaust system will negate much of the camshaft's benefits. Upgrading to a free-flowing exhaust system is essential for optimal performance.
• Intake System: Similar to the exhaust, a restricted intake will limit the potential power gains. An improved intake system is generally recommended.
• Tuning: Proper engine tuning (usually via an ECU reflash or aftermarket engine management system) is crucial to maximize the benefits of a performance camshaft. The engine's computer needs to be calibrated to work with the new cam's timing events.

Realistic Expectations: How Much Power Can You Really Expect?

It's impossible to give a precise number for power gains. A well-chosen camshaft on a properly prepared engine could yield gains ranging from 10-50 horsepower, but it could also result in a loss of power if not chosen or installed correctly. Low-end torque is often sacrificed for high-end horsepower with more aggressive cam profiles.

Many factors influence the ultimate result. Focusing on a holistic approach that involves optimizing all components and ensuring proper tuning will lead to the best possible outcome.

Conclusion:

A camshaft upgrade can significantly impact your engine's power, but it's not a magical solution. Careful consideration of the factors mentioned above and a comprehensive approach to engine modification are crucial to achieving the desired results. Remember to consult with experienced engine builders or tuners before making any significant changes to your engine. They can help you select the appropriate camshaft and guide you through the installation and tuning process.