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The S65 engine, known for its high-revving capabilities and performance, has become a favorite among enthusiasts and tuners alike. One of the most effective upgrades for this engine is the aftermarket camshaft, which can significantly enhance power output and overall performance. In this article, we will compare various aftermarket camshafts for S65 engines to determine which options provide the most power gains.
Understanding the S65 Engine
The S65 engine is a naturally aspirated 4.0-liter V8 engine produced by BMW. It was used in the E92 M3 and is known for its strong performance characteristics. The engine features a high compression ratio, individual throttle bodies, and a lightweight design, making it an ideal candidate for performance modifications.
What is a Camshaft?
A camshaft is a crucial component in an internal combustion engine. It controls the timing and duration of the opening and closing of the engine’s valves. By altering these parameters, aftermarket camshafts can improve the engine’s airflow, leading to increased power and torque.
Factors Influencing Camshaft Performance
- Lift: The height to which the valve opens.
- Duration: The amount of time the valve is open during each cycle.
- Overlap: The period when both the intake and exhaust valves are open.
- Profile: The shape of the cam lobe, affecting how the engine breathes.
Popular Aftermarket Camshafts for S65 Engines
1. KMS Camshafts
KMS offers a range of camshafts designed specifically for the S65 engine. Their camshafts are known for providing a balance between power and drivability. Users report gains of up to 25 horsepower with these camshafts.
2. VAC Motorsports Camshafts
VAC Motorsports produces high-performance camshafts that are designed for maximum power output. Their camshafts can increase horsepower by as much as 30-35 hp, making them a popular choice among serious tuners.
3. BimmerWorld Camshafts
BimmerWorld offers a variety of camshaft options that cater to different performance needs. Their camshafts are engineered for improved throttle response and power gains of around 20-25 hp.
Comparing Power Gains
When comparing aftermarket camshafts, it’s essential to consider not just the raw horsepower numbers but also how the camshaft affects the engine’s overall performance. Here’s a breakdown of the power gains from the most popular aftermarket camshafts:
- KMS Camshafts: Up to 25 hp
- VAC Motorsports Camshafts: 30-35 hp
- BimmerWorld Camshafts: 20-25 hp
Considerations When Choosing a Camshaft
Choosing the right camshaft for your S65 engine involves several considerations:
- Intended Use: Determine if you want a camshaft for daily driving, track use, or racing.
- Power Band: Different camshafts will excel at different RPM ranges.
- Compatibility: Ensure the camshaft is compatible with your existing engine setup and modifications.
- Installation: Consider whether you will install the camshaft yourself or hire a professional.
Conclusion
Aftermarket camshafts can significantly enhance the performance of the S65 engine, with options available to suit various needs and preferences. While VAC Motorsports camshafts may offer the highest power gains, KMS and BimmerWorld also provide excellent options for those looking for a balance between performance and drivability. Ultimately, the best choice will depend on your specific goals and how you plan to use your vehicle.