How much HP does a pulley upgrade add?
The engine has to spin that extra weight over 1000 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 5-8 whp.
How much HP do lightweight pulleys add?
When a lighter weight pulley is combined with a reduced engine load, the results are usually between 10 and 12 horsepower. The STILLEN Performance Pulleys will also make the car feel more lively and responsive, and will also make it gain or lose weight more quickly.
What does an underdrive 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 make a difference?
Pulleys are powerful simple machines. They can change the direction of a force, which can make it much easier for us to move something.
What does a supercharger pulley do?
A supercharger is nothing more than an air compressor mounted on top of a vehicle’s engine. A supercharger pulley is a device used on a supercharger to drive the unit through use of the engine’s accessory belt drive system.
Are aftermarket pulleys 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.
Are aluminum pulleys good?
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.
Is an underdrive pulley worth it?
What is the difference between underdrive vs overdrive pulley?
Overdrive pulleys spin the supercharger faster for a given engine RPM to increase the boost level. Underdrive pulleys consist of alternator, water pump, and crankshaft pulleys to spin the accessories slower for a given engine RPM.
How much weight does a pulley take off?
Pulley FAQ A one-wheel pulley allows you to change the direction of the force you have to apply to lift the load by pulling down to lift a load upwards. Similarly, a two-wheel pulley splits the weight equally so that each holds only half the weight, allowing you to lift the same weight with half of the force.
