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.

Does a lightweight crank pulley make a difference?

The combination of a lighter weight pulley with reduced engine load generally yields results of 10-12 whp. Just as with a lightweight flywheel, a lightweight or lightweight underdriven set of STILLEN Performance Pulleys will make the car generally feel more lively and responsive and quicker to both gain or drop revs.

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.

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 a lighter harmonic balancer do?

A balancer adds weight to help (externally) balance the lower rotating assembly of an engine, while a damper, quells the vibrations during crankshaft vibration which occur as a function of the combustion process. Keep in mind, while all harmonic balancers are dampers, all dampers are not balancers.

Do aftermarket pulleys make a difference?

Aftermarket “LIGHTENED” pulleys will recover lost horsepower due less rotational mass. Basically every pound of rotation mass is equvilent to 10 pounds dry mass. This will require less output being taken from the crank to run these accessories.

How much horsepower do underdrive pulleys give you?

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.

Do aluminum pulleys increase HP?

In a nutshell, YES, lightweight aluminum pulleys do free power and torque. The dyno charts consistently prove that lightweight pulleys improve power, torque, and response across the entire power band. No other modification in the same price range can offer similar gains across the entire power band.

What does an upgraded harmonic balancer do?

The function of the harmonic balancer is to reduce the amplitude of the torsional vibration peaks to an acceptable level. Most OEM harmonic dampers are not designed to cope with the rpm and BHP levels experienced in competition. That is why racers must consider a high-performance damper that is fit for purpose.

What kind of pulley does a Nissan 350Z use?

These pulleys also have the OEM timing marks, which most underdrive pulleys do not, so you can easily check or change your timing…. This light weight racing crank pulley will fit the 2003-2006 Nissan 350Z, with the 3.5L V6 DOHC 24V engine (VQ35DE ENGINE ONLY).

What kind of pulley does VMS racing use?

This is a new, in the factory sealed box, never used or installed, VMS Racing OEM size light weight crankshaft pulley. Unique and exclusive gun metal matte finish.This is a lightweight 6061-T6 billet aluminum CNC machined crankshaft pulley with tolerances kept down to .001, which are usually reserved for aircraft and military designs.

How big is a Honda S2000 crank pulley?

This light weight racing crank pulley will fit the 2000-2009 Honda S2000 with the 2.2L DOHC engines. It weighs just 1 pound and 3 ounces and is of stock size and configuration, so there is no need to change the belts!!!

What is the tolerance for a crank pulley?

Unique and exclusive gun metal matte finish.This is a lightweight 6061-T6 billet aluminum CNC machined crankshaft pulley with tolerances kept down to .001, which are usually reserved for aircraft and military designs. This pulley has better than OEM belt fitment and alignment.