Factors that influence camshaft selection:
* Intended Use: What are you using the engine for? Street driving, drag racing, off-roading? This will determine the ideal powerband and camshaft specs.
* Compression Ratio: A higher compression ratio will benefit from a larger cam.
* Heads: The flow characteristics of the heads determine how well the cam can breathe.
* Exhaust System: A restrictive exhaust system will limit the effectiveness of a larger cam.
* Other Engine Modifications: Are there any other modifications like intake manifold, carburetor, or headers? These will affect the cam selection.
* Desired Driveability: A larger cam will typically lead to more power but can sacrifice low-end torque and drivability.
General Guidelines:
* Mild Street Cam: A cam with a duration of 210-230 degrees at 0.050" lift can provide decent power gains without sacrificing too much driveability.
* Moderate Street Cam: A cam with 230-250 degrees of duration at 0.050" lift will offer more power but may require some tuning and compromise low-end torque.
* High-Performance Street Cam: Cams exceeding 250 degrees at 0.050" lift are typically reserved for modified engines with high compression ratios, good heads, and exhaust systems.
Recommendations:
* Consult a reputable engine builder: They can help you select the best camshaft based on your specific engine and intended use.
* Research camshaft specifications: Many manufacturers provide detailed information about their camshafts, including recommended applications and specifications.
Important Considerations:
* Valve Spring Pressure: A larger cam requires heavier valve springs to control the valves at higher RPMs.
* Valve Train Components: Upgrading to stronger pushrods, rocker arms, and lifters may be necessary to handle the increased load from a larger cam.
* Tuning: A larger cam may require additional tuning to ensure optimal performance and drivability.
In conclusion:
There is no "magic number" for camshaft size. The best cam for your application depends on your specific needs and goals. Seek professional guidance and research extensively before making your selection.
