As you know, every time you get a little something, then you must also give a little something in return. You can avoid many of these issues by not operating your headlights and air conditioning system simultaneously.
Some vehicles, however, require further upgrades to resolve the issue. You may need to run a secondary battery, install a capacitor for an upgraded stereo, and upgrade the alternator. You may need a new serpentine belt installed after the upgrade. You must measure for the new belt once the work is done. Have all the pulleys you plan to run installed on your vehicle. Then take a string to run the route of each pulley. When your string meets the starting point, make your mark and measure the distance.
It may cause harmonic issues with specific vehicles. On some vehicles, you may find that the presence of an underdrive pulley creates more vibration within the vehicle. There have been harmonic issues associated with ASP underdrive pulleys that have resulted in broken timing chains.
Although many vehicles can have this issue countered with the installation of a damper, that is not a guarantee. Every car responds differently to the upgrade, so make sure you pay attention to any unusual symptoms that creep up. It may create a deformation of your crankshaft.
Some vehicle owners believe that their crankshaft is large and strong enough to be rigid and inflexible. On some makes and models, the installation of underdrive pulleys can create twists, bends, and flexes in the crankshaft that are similar to what you could do with a rubber band.
Although each movement is small, there can be significant impacts on the overall performance of the engine. There are fatigue failures associated with underdrive pulleys. With repeated bending and twisting, metals eventually experience fatigue failure. Think about what happens when you bend a metal paper clip back and forth enough times. It will eventually break. The same thing can occur to a vehicle after it receives an underdrive pulley upgrade.
A car that spends a lot of time at low-rpm or cruising speeds might benefit from an overdriven water pump to deliver increased cooling. A V-belt pulley relies on a single groove which mates to a V-shaped belt surface see image at right. A serpentine-style pulley works with a drive belt that has several smaller ribs typically a minimum of six ribs , giving the pulley contact with a greater surface area on the belt.
The result of this design gives the serpentine pulley system greater traction with less slippage than the older V-belt style.
Its higher tension capabilities also make serpentine belts more efficient and reliable, and good quality serpentine belts will have little stretch compared to V-belts.
The reduced slippage means greater engine efficiency both power and fuel efficiency with less load on the engine. In addition, a serpentine system, with its single-belt routing, offers a cleaner, more modern look than multiple V-belt setup. And because a serpentine belt is wider than a smaller V-belt, serpentine pulley systems are stronger and require less belt changes.
Because of the factors we discussed above, your best choice for pulleys is often based on these things among others :. For example, is your water pump a long or short style? Companies like March Performance make pulleys that accommodate a variety of accessories. A serpentine system uses a series a pulleys powered by one drive belt. My husband is thinking about buying a pulley to make his next manufacturing project easier at work, so I am glad that I found this article.
Pulleys — physics happen and you go faster. Stock Crank Pulley — Heavy, Cast Iron Construction The engine has to spin that extra weight over times per minute RPM at idle alone, which explains why, after upgrading from an OEM pulley to a lightweight pulley, we typically see gains of whp. Dec 31, 0. Jun 2, 0. Logging In Now, we are going to go deeper into our understanding of pulleys to see if we can use this knowledge to help make our work easier.
No one knows for sure if pulleys were one of the simple machines that ancient cultures used to build pyramids. A few people believe that the beautiful and massive pyramids could not possibly have been built using something as simple as simple machines.
Some people have wild theories about how the pyramids came to be — that perhaps aliens from another planet came to Earth and built them. Well, we do not know about that, but we do know that human beings are very creative and resourceful when they want to be. As long as we limit ourselves to materials and technologies that would have been available to the ancient Egyptians, it is acceptable for us to use our knowledge to construct pulley systems to build our pyramid.
Figure 2. A pulley on a fishing boat. All rights reserved. A pulley is a simple machine consisting of a string or rope wrapped around a wheel sometimes with a groove with one end of the string attached to an object and the other end attached to a person or a motor. Pulleys may seem simple, but they can provide a powerful mechanical advantage so lifting tasks may be done easily. Pulleys are used in many ways, everyday. What kind of pulleys can you think of?
An elevator is a modern engineering use of a pulley system that performs much like the raising of a large stone for pyramid building. Without the use of pulleys, an elevator would require a large motor to pull the cable straight up. Instead of using a large motor, some elevators use a large weight that takes advantage of gravity to help raise the elevator car see Figure 3. In this situation, the powering motor can be much smaller and only be used to determine the direction the elevator should go.
Figure 3. Adding a counterweight and two pulleys with a motor in the middle makes an elevator easier to move. But how can a wheel with string over it help us move the huge stones required to build a pyramid?
Well, pulleys help us by changing the direction of the force we use to lift an object. Is it easier for you to pull up on a rope or pull down on a rope? By using a pulley, we do not have to pull up on a rope to lift a heavy object attached to it, but instead we can pull down on it. Think of a flagpole as an example. When you pull down on the rope of a flagpole, the flag goes up the pole to wave in the air.
That's because a flagpole has a pulley on it. By using pulleys to redirect force , a stone could be lifted off the ground, allowing more people to grab on to the rope, and adding weight so workers have to pull less. To simplify this effort even more, workers using a pulley could move a large stone up a ramp by pulling on a rope while walking down the ramp, using gravity to their advantage. The real mechanical advantage of a pulley is in using many pulleys at once.
Using multiple pulleys decreases the amount of force necessary to move an object by increasing the amount of rope used to raise the object. The mechanical advantage MA of a pulley system is equal to the number of ropes supporting the movable load. That means, do not count ropes that are only used for redirecting, see Figures 6 and 7. We know from other lessons on simple machines that to gain a greater mechanical advantage, there is a trade-off.
With a pulley, the trade-off is distance. So, if two pulleys are used together, the amount of force required is cut in half, but twice the amount of rope is needed to be pulled to raise the object to the same desired height. Illustrate this concept to students by conducting the following classroom demonstration; see Figure 4. Figure 4. Tie the rope to one of the brooms broom 1 and wrap the rope around the other broom broom 2. Have two students stand about a meter apart each holding one broom, and try to keep the brooms separated while the third student pulls on the free end of the rope; it should be a difficult task to pull the broom sticks together.
Next, wrap the rope around each of the brooms again. This is an example showing the power of mechanical advantage. Refer to the associated activity Pulley'ing Your Own Weight to further students involvement in understanding pulley systems by illustrating how a pulley can be used to easily change the direction of a force, making the moving of large objects easier.
Pulleys can be much more complicated. Engineers combine many pulleys into a pulley system that significantly reduces the amount of force required to lift an object. They often use pulley systems to move extremely heavy objects. A block and tackle is an example of a pulley system that can be attached to anything. It may take a lot of cable or rope, but a human using enough pulleys could lift several tons. Engineers use the block and tackle along with motors and electronics to create modern devices that operate with very low power requirements, such as cranes and elevators.
At Disneyland, engineers even use a pulley system to move Tinkerbell across the sky. We are unsure if the Egyptians used pulleys, and have yet to find any evidence that they did, but we do know, that if they had used them, life would have been easier than if they did not.
Now, since we understand pulleys and have modern materials, we can build the pyramids much easier. Today we are going to look at engineering a pulley system and see if we can design a way to get our heaviest stones to the top of our pyramid with the help of this simple machine. Use the Pulleys and the Pyramids PowerPoint presentation as a helpful classroom tool.
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