Posted by Gruppe S On Friday, July 23, 2010
Recently the Subaru community has been faced with a shortage of the production of engine bearings which has been a bit of a hit to the Engine Building Community. Gruppe-S has searched high and low to offer our customers a solution for our race engines and after much leg work we are extremely happy to introduce the release of the Mahle Motorsports bearing. With a long standing heritage in racing specifically in Formula One, Mahle Motorsports manufactures some of the world's finest bearings. These bearings are not the same as the Formula 1 bearings but are now being built by the same people who build their bearings and going to be available here from Gruppe-S.
These specific Subaru bearing are being used specifically in WRC cars in Europe and will be testing the bearing here shortly at Gruppe-S as well as customer motors and also on famous RWD Hankook drift car.
Some of the special Benefits of Mahle Motorsports bearings
The cheapest method of identifying a bearing is by stamping, and in motorsports this can compromise some performance. The embossed section on the bearing causes less efficient heat transfer because there is less surface contact. Laser marking is an alternative method which creates smaller, more consistent marking which does not distort the backing and as such does not disrupt the backcontact and subsequent heat transfer.
1. The first is that it enables the cross sectional area of the joint face to remain fully intact such that the hoop stresses in the bearing caused by the interference fit with the housing are equally distributed.
• A conventional notch requires a section of the material to be pressed back from the joint face which reduces the cross sectional area and therefore there is less material with which to support the load imposed by the interference fit of the bearing assembly.
• The racing notch allows the contact pressure between the bearing and housing to be maximised if required. This allows the housing to provide maximum support for the bearing and the optimum heat transfer from the bearing into the housing.
2. The second advantage is that the bore of the bearing remains uninterrupted which creates a better surface for the formation of the oil film and it also removes an oil leakage path.