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Why Crankshaft Pulleys are so Vitaly Important

04 Jun 2018

Category: Articles, Industry News

More engines today are being downsized in order to meet increasingly stringent CO2 emission standards. Smaller engines combined with a reduction in power-to-weight ratios has resulted in the need for lighter crankshafts. The lightweight crankshaft has led to the possibility of increased vibration when the engine is running.

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How the Crankshaft Pulley Reduces Damage

Located outside the engine block, the crankshaft pulley is essential to ensure other engine components operate in unison to allow the vehicle to run smoothly. Doubling up as an internal dampener, crankshaft pulleys also reduce the risk of damage to certain engine components as they reduce the vibrations caused as the engine runs.

Types of Crankshaft Pulleys Available

The ECU determines when or if combustion is to occur. This is controlled down to each cylinder, allowing for greater control of emissions and improved performance. As the engine has no single dedicated point for combustion, two undesired by-products are created in this process – harmonic vibration and torsional twisting of the crankshafts.

By using the latest technology, BGA is able to reduce vibration, noise and torsional twisting that is generated in the engine. There are two main types of crankshaft pulleys within the BGA range:

Harmonic damper/balancer Pulley (HdP/HbP)

The centre assembly has an ethylene propylene diene monomer (EPDM) rubber isolator element attached to the outer assembly/belt drive ribs.

Simpler HbP’s are commonly used in petrol engines as combustionpressures are lower than diesel. Thus, the greatest requirement from the pulley is to re-tune the resonance frequency to a range that is not destructive to components within the engine (e.g. crankshaft, camshaft, water pumps, oil pump and timing chain/belt).

De-coupled Pulley (DcP)

The de-coupled torsional/harmonic damper/balancer pulley commonly shares the same type of element for vibration as the HbP. It also has a secondary de-coupled element that is indirectly driven by the centre mounting assembly.

Diverse Range for More Sales Opportunities

There are more than 4,700 crankshaft pulley and pulley kit applications in BGA’s range that covers popular vehicle manufacturers such as Audi, BMW, Fiat, Ford, Jaguar, Land Rover, Vauxhall and VAG. This provides motor factors the scope to adequately cater for the diversity of their customers’ needs.

BGA crankshaft pulley kits ensure that installers are no longer burdened with having to source the correct crank pulley bolts and have the peace of mind in knowing that the correct and highest quality variant has been used.


The majority of crank pulley bolts are Torque to Yield (TTY). This means that once fitted, they are tightened close to their elastic limit. As a result, they should only be used once and not be re-fitted. If re-used, the bolts are susceptible to snapping and the chance of failure is greatly increased.

BGA Crankshaft Pulleys Available from FPS

Available from FPS via same/next-day delivery, speak to your local FPS representative for more information.

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