This is a pair of upper and lower rod bearings with the WPC surface treatment for N20, N54, N55, and S55 turbo engines.
We take a standard BMW bearing shell and give it the WPC treatment, a microscopic shot-peening of the bearing -
- Removes high spots and imperfections
- Improves fatigue resistance
- Increase the surface's oil retention abilities for more lubrication
- Safer than new coatings and will not decrease clearances
- Preserves the bearing's metallurgy, helping to diagnose bearing wear in used oil analysis.
Rod bearings are a typical wear item and more critical on highly stressed engines like a tuned N20 or N54. Although these engines do not rev very high, more mileage with additional boost will eat into bearing life. On our Project 335i we decided to replace the bearings before adding serious power and were surprised to find significant wear at 82,000 miles. Track your bearing wear with regular used oil analysis and plan on rod bearing replacement some time in your engine's future.
Engine manufacturers, including BMW, color-code their bearing parts to match crankshaft and connecting rod sizes. This pair of bearings include 1 upper Yellow and 1 lower Red bearing. This combination is known as the "R Classification". BMW also used a B Classification for Violet/Blue bearings. You must check the front face of the first crankshaft counterweight to determine which bearings are in your engine. Each engine can have different mixtures of R or B bearings. New bearings must match the originals being removed!
Bearings are also sold by size. These are the standard 50.0mm inside diameter size.
Note: connecting rod bolts cannot be re-used. They are stretch-to-yield and must be replaced.
This item is 1 upper and 1 lower bearing, enough for one connecting rod.
BMW Fitments: E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 135is
E82 / E88 (08-13) > 1M (11-12)
2 SeriesF22 / F23 (2014+) > 228i
F22 / F23 (2014+) > 228i xDrive
F22 / F23 (2014+) > M235i
F22 / F23 (2014+) > M235i xDrive
2 SeriesF87 (2016+) > M2
3 SeriesE90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi
3 SeriesF30 / F31 / F34 (2012+) > 320i
F30 / F31 / F34 (2012+) > 320i xDrive
F30 / F31 / F34 (2012+) > 328i
F30 / F31 / F34 (2012+) > 328i xDrive
F30 / F31 / F34 (2012+) > 335i
F30 / F31 / F34 (2012+) > 335i xDrive
3 SeriesF80 (2015+) > M3 (2015+)
4 SeriesF32 / F33 / F36 (2014+) > 428i
F32 / F33 / F36 (2014+) > 428i xDrive
F32 / F33 / F36 (2014+) > 435i
F32 / F33 / F36 (2014+) > 435i xDrive
4 SeriesF82 / F83 (2015+) > M4 (2015+)
5 SeriesE60 / E61 (04-10) > 535i
E60 / E61 (04-10) > 535xi
5 SeriesF10 / F11 (11-16) > 528i
F10 / F11 (11-16) > 528i xDrive
F10 / F11 (11-16) > 535i
F10 / F11 (11-16) > 535i xDrive
6 SeriesF12 / F13 (12-18) > 640i
X SeriesE70 X5 (07-13) > X5 xDrive35i
X SeriesE71 X6 (08-14) > X6 xDrive35i
X SeriesE84 X1 (2013+) > X1 28i
E84 X1 (2013+) > X1 28i xDrive
E84 X1 (2013+) > X1 35i xDrive
X SeriesF15 X5 (2014+) > X5 sDrive35i
F15 X5 (2014+) > X5 xDrive35i
X SeriesF16 X6 (2014+) > X6 sDrive35i
F16 X6 (2014+) > X6 xDrive35i
X SeriesF25 X3 (2011-2017) > X3 sDrive28i
F25 X3 (2011-2017) > X3 xDrive28i
F25 X3 (2011-2017) > X3 xDrive35i
X SeriesF26 X4 (2015-2018) > X4 28i xDrive
F26 X4 (2015-2018) > X4 35i xDrive
F26 X4 (2015-2018) > X4 M40i xDrive
X SeriesF48 X1 (2016+) > X1 28i
F48 X1 (2016+) > X1 28i xDrive
Z SeriesE89 Z4 (2009-2016) > Z4 sDrive28i
E89 Z4 (2009-2016) > Z4 sDrive35i
E89 Z4 (2009-2016) > Z4 sDrive35is
