Table of Contents
Does a lightweight crank pulley increase horsepower?
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.
Are lightweight crank pulleys worth it?
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 does a crank pulley upgrade 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.
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 causes a crank pulley to wobble?
It is possible for the crankshaft pulley to wobble if the fan-belt pulleys that bolt to the harmonic balancer are dismounted, deformed, or otherwise damaged. Dismounting the pulleys might also cause wobbling. The typical tools may be used to remove these pulleys from the system.
What does a overdrive crank pulley do?
Overdrive pulleys are for the S/C, while Underdrive pulleys are for the N/A cars. 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.
Does the size of a pulley matter?
A larger diameter pulley wheel (aka sheave) is technically more efficient than a smaller diameter pulley. But it’s a trade off: a larger pulley has increased bulk, weight and cost. For example, in a 1:1 haul, you gain about 7% efficiency going from a 1.5” pulley to a 3.75” pulley.
What is super damper?
The ATI Super Damper is an elastomer style harmonic damper. Unlike OEM style dampers with a press-fit elastomer material, a Super Damper employs a combination of 70 durometer O-rings and a unique, full-captured inertia ring to dampen harmful crankshaft vibrations.