Power and torque

If we want to go faster, it takes more horsepower. If we want to go slower, it takes less horsepower. Depending on the resistance to the application of force, it may or may not result in movement.

Power and torque

If you have not reviewed these concepts for a while, it would be helpful to do so before studying this article. For example, we have heard engine builders, camshaft consultants, and other "technical experts" ask customers: In fact, the opposite is true, and you should be clear on these facts: Figure 1 Referring to Figure 1, assume that the handle is attached to the crank-arm so that it is parallel to the supported shaft and is located at a radius of 12" from the center of the shaft.

In this example, consider the shaft to be fixed to the wall. Let the arrow represent a lb. Because the shaft is fixed to the wall, the shaft does not turn, but there is a torque of pound-feet pounds times 1 foot applied to the shaft.

In the same way that one ton is a large amount of weight by definition, poundsone horsepower is a large amount of power. The definition of one horsepower is 33, foot-pounds per minute. Consider the following change to the handle-and-crank-arm sketch above.

The handle is still 12" from the center of the shaft, but now, instead of being fixed to the wall, the shaft now goes through the wall, supported by frictionless bearings, and is attached to a generator behind the wall.

Suppose, as illustrated in Figure 2, that a constant force of lbs. In other words, the "arrow" rotates with the handle and remains in the same position relative to the crank and handle, as shown in the sequence below.

That is called a "tangential force". Figure 2 If that constant lb. The output shaft of the gearbox of the engine in Example 4 above turns at RPM.

The point to be taken from those numbers is that a given amount of horsepower can be made from an infinite number of combinations of torque and RPM. Think of it another way: In fact, in cars of equal weight, the smaller engine will probably race BETTER because it's much lighter, therefore puts less weight on the front end.

AND, in reality, the car with the lighter 2-liter engine will likely weigh less than the big V8-powered car, so will be a better race car for several reasons. Measuring Power A dynamometer determines the POWER an engine produces by applying a load to the engine output shaft by means of a water brake, a generator, an eddy-current absorber, or any other controllable device capable of absorbing power.

Then it applies various factors air temperature, barometric pressure, relative humidity in order to correct the observed power to the value it would have been if it had been measured at standard atmospheric conditions, called corrected power.

Power to Drive a Pump In the course of working with lots of different engine projects, we often hear the suggestion that engine power can be increased by the use of a "better" oil pump. Implicit in that suggestion is the belief that a "better" oil pump has higher pumping efficiency, and can, therefore, deliver the required flow at the required pressure while consuming less power from the crankshaft to do so.

While that is technically true, the magnitude of the improvement number is surprisingly small. How much power does it take to drive a pump delivering a known flow at a known pressure? We have already shown that power is work per unit time, and we will stick with good old American units for the time being foot-pounds per minute and inch-pounds per minute.Power - ft-lb nut-busting torque from a tool weighing just lb Milwaukee Fuel High Torque 1/2 Impact Wrench w/ Friction Ring Kit.

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Power and torque

$ (23 new offers) out of 5 stars Power Torque Services, LLC has maintained an excellent reputation in the Oil and Gas industry since the company opened its doors in August of where P is power, τ is torque, ω is the angular velocity, and ⋅ represents the scalar product.

Algebraically, the equation may be rearranged to compute torque for a given angular speed and power output. All PowerTorque Tools are manufactured to meet or exceed U.S.

government and American National Standards Institute specifications. Every PowerTorque tool must pass a series of state-of-the-art tests to for hardness, strength, and performance and are guaranteed against defects in Founded Location: Springfield, MO.

Power Torque Engines - 48 Kremzow Rd, Brendale - Rated based on 42 Reviews "Had the car tuned by mitch, I went a fairly excessively large cam /5(41). Power Torque Engineering Ltd is a modern company with a proud history.

The present Power Torque portfolio is the product of over 90 years of establishment; the company developing from its original roots of retail motor vehicle dealership to meet changing and more sophisticated demands in the market place.

Power and Torque: Understanding the Relationship Between the Two, by EPI Inc.