Cam Shaft Tech

Posted: May 13, 2011 by kemist88 in Tech
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fully understanding cam shafts and lift durations and all that stuff is still a little above my paygrade . but these guys have explained it enough. I still dont get it but its a little insight .
“Camshafts are arguably the most important part of the engine. They determine how the car performs, idle, and character of the car as a whole. Understanding the function, design, and limitations of the camshaft profile is essential. This information lets the builder choose which camshaft(s) will maximize the intended performance of the engine / turbo configuration.

Function There are a total of four steps of the combustion process: intake, compression, power, and exhaust. The crankshaft position, stroke, and rod length determine the position of the piston in the cylinder. The camshaft is what determines the position of the intake and/or exhaust valves during the stroking process. The camshafts control the valve timing of the engine. This is what makes or breaks the total performance of your car. The performance characteristics of the engine are determined by when the valves open, how high (lift) and how long they are open for (duration).

Power Band Where does the engine make power? Where does the engine begin to drop power? When the power does come on, is it flat and consistent or is it jumpy and aggressive? These questions can all be answered with the description and understanding of the engine’s power band. A narrow power band would only range from 6000 to 8000 RPM. A wider one would range from 3000 to 7000 RPM. More so than any other internal components of the engine, the camshaft and the complimentary valve train components will establish the power band.

Ideal Cam What is the perfect cam? The cam with huge low-end torque, a redline set at 10,000 RPM, glass smooth idle, and a power band from idle to redline does not exist. Never has, never will. But an aftermarket performance cam that optimizes the rest of your performance engine does exist. Dollar for dollar, there is a good chance that someone somewhere does make a camshaft that’s the best investment you can make.”

This is just the intro please check out the rest of the article here >>>

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