Is a lightweight crank pulley bad?
On a well maintained engine with bolt-ons or low amounts of boost like what most owners probably run, a lightweight aluminum crank pulley will not have any life threatening consequences. The engineering reasons are that most modern engines have a short (increasingly strong) crankshaft operating under 8,000 RPM.
What are the benefits of a lightweight crank pulley?
A lightweight pulley accomplishes this simply by reducing rotational mass – or in leymans terms, because it weighs less, it takes less horsepower to spin the pulley, so more horsepower gets to the wheels.
What does a aftermarket crank pulley do?
An aftermarket crank pulley can be used to increase the horsepower of a vehicle. These pulleys are designed to weigh considerably less than the pulleys that come standard out of the factory, largely because they do not have harmonic dampeners installed.
What does an under pulley do?
Underdrive pulleys increase engine output by reducing the draw of the engine’s accessories by slowing them down and reducing the horsepower (HP) they use. Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley.
Can pulleys give you horsepower?
Underdrive pulleys will yield a small increase in horsepower anywhere from 8 to 15 hp. This is accomplished by reducing the amount of power needed to drive the engine accessories that eat up precious horsepower.
What does an upgraded crank pulley do?
Underdrive pulleys increase engine output by reducing the draw of the engine’s accessories by slowing them down and reducing the horsepower (HP) they use.
Do pulleys add horsepower?
Horsepower gains from underdrive pulleys can vary by vehicle, engine, number of accessories and the amount of underdrive (improvements of up to 5–15 HP at the wheels have been seen). Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley.
How much HP do underdrive pulleys add?
Underdrive pulleys usually are a performance enhancing item that increases the torque and horsepower output of an engine by reducing drag caused by belt-driven accessories. Horsepower gains from underdrive pulleys alone are usually around 4-7 hp.
How much HP does underdrive pulleys add?
Is an underdrive pulley worth it?
Underdrive pulleys, when applied to the accessory components of a vehicle, drive the components at a lesser speed because of their increased diameter size. As far as an upgrade, they provide one of the cheapest returns for the money spent when it comes to actual performance and horsepower gains.
How much horsepower does a pulley kit add?