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At very high RPMs, the longer valve times will allow for plenty of fuel to enter the cylinders, even as the cam quickly rotates. In addition to the unique sound, a lope is actually desirable when racing. When cams are wide enough, they will overlap, so in other words, the intake on cylinder two will open before the intake on cylinder one is closed. It’s highly undesirable for performance, but the sound is much sought-after by gearheads who want their performance truck to sound like a performance truck.Ī lope is caused by extremely large and wide cams. Conversely, retarding the cam will improve high-end horsepower at the expense of low-end torque.Ī lope is a distinctive, rhythmic rumble that occurs when an engine is idling. Adjusting the camshafts so the cams are slightly ahead or behind will alter the engine’s performance.Īdvancing the timing will cause the fuel intakes to open and close earlier, which improves low-end torque. The larger the cam, the more fuel that is let in. A bigger cam will open the intake valve wider, allowing more fuel and air into the cylinder. With that said, aftermarket cams are designed for high-end performance, so you can typically expect to experience faster speeds after camming a truck. In most cases, yes, but it depends on the model of the truck and which custom cam you use. So, what can you expect if you cam your truck? Here’s a quick overview of truck camming basics. However, if you want a deep, roaring engine, camming may be a worthwhile option. The downside here is obvious - your gas mileage and towing performance will clearly suffer. Yes, it’s inefficient at slow speeds, but it also provides a distinctive, aggressive rumble that makes the engine sound deeper and richer. That being said, many truck owners simply prefer a custom camshaft for aesthetic reasons. Specifically, your low-end torque will suffer, which can prove problematic for a work truck or for towing since you need a lot of torque to get started with a heavy load. While increased fuel intake is helpful at higher speeds, it’s actually detrimental to your performance at lower speeds. While this may sound like an easy decision based on the benefits, camming a truck is not without its downsides. This provides additional power and efficiency at higher engine speeds. As a result, the intake valves are open for an extended period. But if you have a heavy load or you’re racing, you may want a shaft that’s engineered for your specific purpose.Ĭustom camshafts are designed with larger, wider lobes than factory shafts. However, most stock camshafts are generalists and perform best during everyday driving. For example, allowing more fuel into the cylinder is wasteful at low RPMs, but provides more power at higher RPMs. A small change in this duration can make a big difference in how the engine performs.ĭifferent camshafts will allow the vehicle to perform better under certain conditions. For instance, the intake valve may open for a longer or shorter period of time during the upstroke. Moreover, a camshaft determines the duration and nature of the ignition process. As the shaft rotates, the valves will open and close in the appropriate timing. One lobe will activate the intake valve, followed by a second lobe that activates the exhaust valve.
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The camshaft activates a cylinder’s intake and exhaust valves. Instead, they fire in a sequence, one after the other, and the motor’s camshaft raises and lowers the pistons to determine the firing sequence. In an engine with multiple pistons, such as a truck motor, the pistons don’t fire simultaneously.
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Since that time, camshafts have become an essential part of engine design. They quickly spread throughout the civilized world, but their use was limited until the industrial revolution. The earliest camshafts date back to the 13th century when Arabs used them to operate water mills. As the shaft rotates, the larger parts of the lobes can drive levers or pistons. There are one or more cams, or irregular lobes, that actuate parts of the machine along the rod. A camshaft is a metal rod that drives an engine.