Understanding the Restraints of Active Fuel Management
What is AFM?
At the heart of this topic lies a crucial component: Active Fuel Management (AFM). Many 6.2L engines incorporate AFM, also known as cylinder deactivation. This system is designed to improve fuel economy by temporarily shutting down a portion of the engine’s cylinders under light load conditions, such as cruising on the highway. The engine effectively operates as a smaller displacement engine when AFM is engaged. While AFM can, in theory, increase miles per gallon, it often comes with inherent drawbacks that can disappoint performance enthusiasts.
Common Issues with AFM
The system utilizes a complex arrangement of lifters, solenoids, and a dedicated engine control module (ECM) that orchestrates the cylinder deactivation process. The ECM monitors various sensor inputs, such as throttle position and engine load, and makes decisions about which cylinders to deactivate or reactivate. However, this complex system can introduce a number of challenges. One of the most noticeable is a reduction in throttle response. The engine’s eagerness to react to your right foot can feel sluggish. Instead of instant power delivery, there’s a delay as the engine transitions between modes.
Furthermore, AFM systems can introduce engine wear. The constant switching between two-cylinder operation and full operation can place additional stress on the engine. Specific components, such as the AFM lifters, are known to be failure points in some engines, ultimately requiring costly repairs. The switching can create vibrations and unusual sounds, which diminish the overall driving experience. The quest for fuel efficiency often comes at the expense of a smooth, refined engine. The intended benefits of AFM can be negated by increased repair costs and diminished performance. For enthusiasts, the advantages don’t often outweigh the drawbacks.
The Essence of an AFM Delete Kit
Definition and Components
The solution for those seeking to unleash the full potential of their 6.2L engine is an AFM delete kit. This comprehensive package effectively removes the AFM system from your engine, allowing all cylinders to operate consistently. It’s a transformative upgrade for anyone who is after more power and reliability.
An AFM delete kit typically includes several crucial components. First and foremost, the kit provides replacement lifters. These lifters are engineered to function without the AFM function, ensuring reliable valve operation. The kit will likely come with a new valley cover, as the original cover houses the components related to the AFM system. The delete kit will also probably feature a set of new head bolts. These bolts are usually stronger than the original bolts and provide a secure clamping force. New pushrods, often the correct length for the upgraded lifters, are part of the kit. These are important to make sure the valve train geometry stays true.
Benefits of an AFM Delete
The advantages of an AFM delete are significant. Removing AFM directly translates to increased power and torque. Because all cylinders are constantly firing, the engine is capable of producing its maximum output at all times. The engine will respond much more readily to throttle input. The engine will seem to respond almost instantly to the movement of your right foot.
One of the most important improvements is the potential for increased engine reliability. By eliminating the AFM system, you eliminate the lifters, solenoids, and related components that are prone to failure. This removal leads to a more robust engine that is less susceptible to costly breakdowns. Additionally, AFM delete kits can contribute to a smoother and more enjoyable driving experience. The potential for engine vibrations, caused by cylinder deactivation, is eliminated.
The Power of Performance Camshafts
Introduction to Performance Cams
While deleting AFM restores consistent cylinder operation, adding a performance camshaft takes engine performance to the next level. The camshaft, often called the heart of the engine, is responsible for controlling the opening and closing of the intake and exhaust valves. By optimizing the valve timing, a performance camshaft can dramatically alter the engine’s power delivery and characteristics.
Key Camshaft Specifications
A performance camshaft provides a tailored profile for the lift, duration, and lobe separation angle. Lift refers to the distance the valve is opened. Duration refers to the amount of time, in crankshaft degrees, the valve remains open. Lobe Separation Angle (LSA) is the angle between the centers of the intake and exhaust lobes. These specifications work together to determine the engine’s overall performance. For example, a camshaft with a longer duration will allow the engine to take in more air and fuel and push out exhaust gases for more performance.
Benefits of a Performance Cam
The benefits of a performance camshaft are compelling. The biggest advantage is an increase in horsepower and torque. A performance camshaft can improve the engine’s breathing and combustion efficiency, unlocking substantial power gains. You will be able to take advantage of all the power the engine can make. The performance cam will also give the engine a distinct and aggressive sound. The increased valve lift and duration will produce an unmistakably aggressive exhaust note that will announce the car’s presence. In some cases, the correct cam can even boost fuel efficiency because a more efficient combustion cycle can be achieved.
Choosing the Correct Components for Your Build
Selecting an AFM Delete Kit
Choosing the right combination of AFM delete kit and performance cam is vital. It is important to do your research and planning to ensure a successful and satisfying outcome.
Selecting an AFM delete kit involves researching reputable brands. Look for kits that use high-quality components, such as durable lifters and a robust valley cover. Consider factors such as your engine’s year of manufacture. Carefully evaluate your budget and the amount of power gains you desire.
Selecting a Performance Cam
The choice of a performance camshaft is equally important. To make the best selection, you need to match the camshaft to your driving style and what you intend to do with the car. Consider what kind of driving you typically do. Are you a daily driver, or do you take the car to the track? Some cams are tailored to produce more low-end torque, which is beneficial for stop-and-go driving and towing. Others focus on top-end power, ideal for racing applications.
Professional Guidance and Supporting Mods
Consulting with camshaft manufacturers is highly recommended. Reputable companies provide detailed information on their camshaft specifications, including lift, duration, and LSA. They can help you select a cam that aligns with your specific performance goals. Make sure to include supporting modifications in your build plan. A cam might require stronger valve springs to handle the increased lift and higher engine speeds.
Professional installation is always recommended. However, for the mechanically inclined, the process can be completed at home.
The Installation Process: A Simplified Overview
(Please note: This is a simplified overview. Proper installation requires mechanical expertise and the use of appropriate tools.)
The removal of AFM requires a process that demands mechanical skill and careful attention to detail.
Before beginning, drain the engine’s oil and coolant. Disconnect the battery. The engine bay will require preparation, including the removal of accessories. The intake manifold, valve covers, and various other components will need to be removed to access the valvetrain.
With the engine prepped, the removal of the old AFM components is necessary. Carefully remove the pushrods, lifters, and valley cover. Remove the old camshaft and carefully install the new performance cam. Make sure to use the correct cam lube.
Then, install the new AFM delete components. Place the new lifters, valley cover, head bolts, and pushrods. All components should be installed to the manufacturer’s specifications.
Once the mechanical work is complete, you will need to reassemble the engine. Replace all the parts that were removed earlier. Ensure that all connections are made correctly.
The final step is engine tuning. This is an essential part of the process. The new cam will likely require a retune of the engine control unit (ECU) to optimize the engine’s performance. The purpose is to ensure the proper air/fuel mixture and ignition timing. An improperly tuned engine will not run correctly and could suffer serious damage. Professional tuning is highly recommended.
Performance Results and Real-World Gains
Dyno Results and Performance Data
The combination of an AFM delete kit and a performance cam results in tangible and noticeable improvements.
Performance gains are often verified on a dynamometer. Dyno tests will reveal the power and torque increases. These tests will provide a snapshot of how much horsepower and torque the engine is producing before and after the upgrades.
Real-World Driving Experience
The real-world benefits are also dramatic. Drivers will experience significantly improved acceleration and a more immediate throttle response. The increased power output translates to a more engaging driving experience. The engine will also produce a more aggressive and pleasing exhaust note.
Owners who have performed this upgrade often report increased reliability. The elimination of the AFM components removes a potential point of failure.
Conclusion
Deleting AFM and installing a performance camshaft is an effective way to unlock the true potential of your 6.2L engine. By removing the constraints of AFM and optimizing the valve timing with a performance cam, you will experience a substantial increase in power, torque, and overall driving enjoyment.
This upgrade is an investment in your driving experience and in the longevity of your engine. You can now go through the process of researching AFM delete kits and performance cams that meet your needs. For those who are not mechanics, find a reputable shop to do the installation.
This article provides general information, and it is essential to consult with qualified professionals and follow the manufacturer’s recommendations. The upgrade can transform the way your 6.2L performs. Now you can go and experience the thrill of a fully unleashed engine.