what is cammed

3 min read 26-12-2024

Meta Description: Discover what "cammed" means in the automotive world! This comprehensive guide explains camshafts, their function, the effects of camshaft upgrades ("getting cammed"), and the pros and cons. Learn about different cam profiles, choosing the right cam, and potential downsides. Get ready to understand the power behind a cammed engine!

What is a Camshaft? The Heart of the Engine's Breathing

Before understanding "cammed," we need to understand the camshaft. The camshaft is a crucial component within an internal combustion engine. It's responsible for controlling the intake and exhaust valves, dictating when they open and close. This precise timing is critical for optimal engine performance. Think of it as the engine's heartbeat, regulating the flow of air and fuel.

How a Camshaft Works: A Simple Explanation

The camshaft is a rotating shaft with lobes (bumps) that push on valve lifters. These lifters, in turn, operate the valves. As the camshaft rotates, the lobes push on the lifters, opening the valves. When a lobe moves away, springs close the valves. This precisely timed opening and closing is vital for efficient combustion.

What Does "Cammed" Mean? Unlocking Engine Potential

"Cammed" simply means that an engine has had its camshaft upgraded. This upgrade typically involves replacing the stock camshaft with a performance camshaft. This seemingly small change can dramatically alter engine characteristics, leading to significant increases in horsepower and torque. The modifications to the camshaft profile change the duration and lift of the valves.

Understanding Cam Profiles: Duration and Lift

Duration: Refers to how long the valve remains open. A longer duration cam keeps the valves open for a longer period, allowing more air and fuel into the engine (intake) and better exhaust expulsion.
Lift: Indicates how far the valve opens. Increased lift allows more air and fuel to enter and exhaust gases to exit, boosting engine power.

A "cammed" engine often boasts a more aggressive cam profile with increased duration and lift compared to the stock cam. This results in a more powerful, but potentially less fuel-efficient, engine.

The Pros and Cons of Getting Cammed

Pros:

Increased Horsepower and Torque: This is the primary reason people "cam" their engines. Expect noticeable power gains, especially in the upper RPM range.
Improved Engine Response: A performance cam can make the engine feel more responsive and lively. Acceleration and throttle response typically improve.
Enhanced Exhaust Note: Many cam profiles produce a more aggressive and throatier exhaust sound.

Cons:

Reduced Low-End Torque: Aggressive cam profiles often sacrifice low-end torque. This can make the car feel sluggish at lower RPMs.
Potential for Reduced Fuel Economy: Increased duration and lift often lead to less efficient combustion, reducing fuel economy.
Increased Engine Noise: Expect a louder engine, especially during idle and higher RPMs.
Difficulty Starting (In Some Cases): Certain aggressive cam profiles can make cold starts difficult, requiring a modified starting system.
Increased Wear and Tear: More aggressive cam profiles put more stress on the valve train, leading to potentially faster wear.

Choosing the Right Camshaft: It's All About Application

The ideal camshaft depends heavily on the intended use of the vehicle.

Street/Daily Driver: A milder cam profile that balances power gains with drivability is recommended. The goal is to maximize everyday usability without extreme compromises.
Race Car: Here, aggressive cam profiles are often used to maximize horsepower at the expense of low-end torque and fuel efficiency. Maximum power output is the priority.
Off-Road Vehicle: A camshaft profile that provides strong low-end torque is usually preferred to handle the demands of off-road driving.

Beyond the Camshaft: Complementary Upgrades

Getting "cammed" often involves other modifications. These could include:

Valve Springs: Stronger springs are needed to manage the increased valve lift of a performance cam.
Valve Train Components: Upgraded pushrods, rocker arms, and lifters may be required for reliable operation.
Headers and Exhaust: A performance exhaust system is often necessary to maximize the benefits of the camshaft upgrade.
ECU Tuning: To ensure the engine runs correctly with the new camshaft, custom tuning of the engine control unit (ECU) is crucial.

Conclusion: Cammed Engines – Power and Precision

"Cammed" signifies an engine modification that can significantly improve performance. However, it's important to understand the potential drawbacks and choose a camshaft profile that aligns with your needs and driving style. Careful planning and professional installation are crucial for a successful camshaft upgrade. Remember, always consult with experienced mechanics and engine tuners to ensure a safe and effective camshaft installation.