What Is an Underdrive Pulley?

Answer Since the federal government began regulating engine modification, enthusiasts have had to become much more creative in finding a means to emissions legal power. Underdrive pulleys are one such 50-... Read More »

Top Q&A For: What Is an Underdrive Pulley

Underdrive Pulley vs. Lightweight Pulley?

Most modern cars feature a serpentine belt system mounted to the engine. This system of pulleys provides power to various engine accessories, such as the alternator and air conditioning system. All... Read More »

How to Install an Underdrive Pulley?

Every car engine uses a number of pulleys to drive components such as the fan and the air conditioning. These components are driven by a belt that in turn is driven by the engine's crankshaft. The ... Read More »

The Pros & Cons of an Underdrive Pulley?

Underdrive pulleys on vehicles have been around since the 1950s, commonly mounted on street performance hot rods, and much later on the Ford Mustang. Underdrive pulleys, when applied to the accesso... Read More »

Problems With Underdrive Pulley Sets?

Underdrive pulley sets are designed to drive the vehicle's accessories, such as the alternator, water pump, power steering pump and air conditioner compressor at a slower rate than the stock pulley... Read More »