Name: Mini Gen 1 GTT Supercharger Rotor Pack Rebuild
SKU: 1519
Availability: OutOfStock

Description

Why GTT No Longer Offers Rotor Pack Rebuilds for the MINI R53 Eaton M45 Supercharger

At GTT, we are always committed to delivering reliable, high-quality services that our customers can trust. For a period of time, we explored and offered rotor pack rebuilds for the MINI R53 Eaton M45 supercharger, investing significant effort into developing the correct processes and specialist tooling required for such a precise operation.

One of the most critical aspects of a rotor pack rebuild is maintaining the exact timing relationship between the two rotors.

This timing, or radial orientation, must be absolutely perfect. Even the slightest deviation can result in rotor contact, which will ultimately destroy the supercharger, whether at low RPM or under higher load when heat expansion comes into play.

Unlike some assemblies, there are no alignment splines or guides on the rotor shafts where the gears are mounted. To overcome this, we designed and manufactured dedicated GTT tooling capable of securely holding and re-timing the rotors with the level of precision required. From a technical standpoint, we successfully solved one of the most challenging parts of the rebuild process.

However, the greater issue lies in the construction of the rotor pack itself. In order to replace the bearings, the front gears and internal components must be pressed out of a thin-walled aluminium casing. Despite extensive testing, including the use of controlled heating methods and refined pressing techniques, we consistently found that there is a greater than 50% chance of damaging or cracking the casing during disassembly.

This level of risk is simply too high for us to justify offering the service. A failure during the process would render the rotor pack unusable, which is not acceptable for either GTT or our customers. After careful evaluation, we made the decision to discontinue rotor pack rebuilds.

The good news is that rotor pack bearings themselves are generally very reliable. They are manufactured to a high specification and benefit from being supported at both ends, resulting in significantly less wear compared to other areas of the supercharger. In contrast, failures are far more commonly seen in components such as the snout pulley bearings and the PTO assembly, both of which remain key service areas we continue to support.

As always, our focus remains on providing dependable solutions and ensuring our customers receive the best possible outcome for their supercharger needs.

Spec below:

GTT S/C ROTOR PACK REBUILDS !
As many people know we have been offering both PTO (Power Take Off) and Snout (Nose) rebuilds now for the R53 Supercharger for some time now . With a small number of chargers coming through the door requiring rotor pack bearing replacements, we are now in the position of being able to offer this service as well.
The main difficulties concerning rebuilding this part of the SC are :-

A) Sourcing suitable bearings and seals.
b) Accurately re-timing the 2 rotors ( The radial orientation relative to each other).
We are pleased to say we now have the correct special bearings & seals in stock. We have also designed and made tooling to facilitate the super precision rotor re-timing required during refitting of the front gears.
WARNING.. If you have decided to press off the front gears yourself , your SC is effectively scrap now , so please don’t do it . Please send us the complete supercharger . We will carry out an initial inspection and advise you which area of your SC requires reconditioning. Whichever service is required we will automatically fit a new uprated GTT Coupler and 2 x Fully Synthetic Oil changes as part of the job.

With new units costing a whopping £1350, and second hand units of ‘unknown condition’ becoming both scarce and more expensive, a GTT rebuild on your own charger makes much more sense.