What is a 10% underdrive pulley?

A 10% underdrive pulley spins your engine's accessories, like the alternator and water pump, at 90% of the engine's actual speed. This reduces the load on the engine and can free up a small amount of horsepower.

How many grooves does this pulley have?

This ATI pulley features four grooves, which is important for applications using multiple accessory belts to drive different components.

What is the benefit of installing this pulley?

The primary benefit is reducing the parasitic drag on the engine caused by accessories spinning at full speed. This can lead to a slight increase in horsepower and a reduction in accessory load.

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Specifications

Brand: ATI
Part #: ATI916732
UPC: 800157053719

ATI Pulley - A/C - 4 Grv - Rear 10 Percent U/D LS1

Name: ATI Pulley - A/C - 4 Grv - Rear 10 Percent U/D LS1
Brand: ATI
SKU: ati-ati-pulley-a-c-4-grv-rear-10-percent-u-d-ls1-t14-360999
Price: 107.52 USD
Availability: BackOrder

$107.52

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

ATI 10% underdrive crank pulley for LS1 engines. Improves accessory drive efficiency.

Key Features

Fits LS1 engines.
10% underdrive design slows accessory speeds.
Four groove pulley accommodates multiple accessory belts.
Well-built component from ATI.

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About this part

Product Details

This is an ATI 10% underdrive rear crank pulley designed for LS1 engines. It's a well-built component that helps your engine's accessories run a bit more efficiently by slowing them down slightly. This can be a smart move if you're looking to free up a little bit of horsepower or reduce the load on your accessories.

The pulley features four grooves, providing ample space for your accessory belts. Being a 10% underdrive unit means the accessories driven by the crank pulley, like the alternator and water pump, will spin at 90% of the engine's speed. This is a common modification for LS1 builds where owners want to optimize accessory performance and potentially gain a small amount of power. It's a solid option for anyone working on their LS1 engine and looking for a reliable underdrive pulley.