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BMW Mini Cooper
Mini Cooper Crank Pulley Upgrade R52 R53 Cooper S

Mini Cooper Crank Pulley Upgrade R52 R53 Cooper S

Mini Cooper Crank Pulley Upgrade R52 R53 Cooper S
Part No: NME5038-P
Internet Price $0.00
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Lightweight Crank Pulley to replace the trouble prone stock unit. Available in Standard Diameter or 2% Oversized.


2002-2006 R53 MINI Cooper S Hatchback
2005-2008 R52 MINI Cooper S Convertible

Through extensive weight savings afforded by 6061 aircraft aluminum construction, power gains of up to 10% are available depending on how your MINI is set up. CravenSpeed crank pulleys come fully balanced and counter-weighted, and feature anodizing for superb wear resistance & strength.

NOT compatible with Cooper (non-S) models.

Releasing Power

The rule of thumb is that each pound of weight taken off the engines rotating assembly is worth approximately 2.7HP. The concept is that the crank is a parasite; it does not put power to the drivetrain but still requires the energy produced by the engine to rotate. When you reduce this parasitic weight, you release power that was previously used only for spinning the supercharger and alternator.

Is this crank pulley safe?

The pulleys on the R53's 1.6 and most new smaller engines have an elastomer (rubber ring) incorporated into the pulley that looks similar to a harmonic damper. The elastomer in the OEM pulley serves as an isolator, which is there to suppress natural vibration and noise from the engine itself, the A/C compressor, P/S pump, and alternator. The purpose of a traditional harmonic damper is to protect against crank failure from torsional movement. This is not necessary in the MINI or most modern engines because of the many advances in engine design and materials. Factors such as stroke, displacement, inline, V configurations, power output, etc., do determine when and how these harmonics and torsional movements occur.

Tools for removing and installing the pulley can be found below:
NME5031 Crank Pulley wrench
NME5032 Crank Pulley Removal Tool
NME5033 Pulley installer tool

For the MINI Factory Vibration Damper replacement, see NME7647.

For a lightweight Harmonic Damper Upgrade, see NME5075.

For the Fluid Filled Harmonic Damper upgrade, see NME5080.

For the factory replacement Bolt for the crank pulley, see NME7649.

What does the 2% crank pulley oversized do actually?
The oversized crank pulley causes all the belt driven peripherals to spin faster than  normal. This is done because the supercharger will spin faster creating more boost. It has a similar effect to using a smaller supercharger pulley, except the larger crank pulley spins 'everything' faster (alternator, ac compressor).

FYI, we were the first company to introduce the smaller supercharger pulley for the MINI and our testing showed that the 15% reduction pulley for the supercharger was optimum. Smaller s/c pullies will spin the supercharger beyond the maximum rating at redline. We also found the temperature of the intake charge increases exponentially as the boost increases. When using a s/c pulley smaller than 15%, the intake temp gets so hot that the engine pulls back timing to reduce combustion temps - which defeats the main goal of increasing power!

If you use a smaller s/c pulley, best not to use the oversized crank pulley.

MINI Part Team.
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Related Technical Articles:
Mini Cooper Pulley
Created: October 30, 2014
The Crank Pulley on the MINI Cooper engine not only functions as a Harmonic Balancer but just as important it drives the pulley for the Supercharger and alternator pulley.
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