King CR6640XP connecting rod bearings for BMW M20, M50, M52 and M54 engines with standard crankshaft. This is the STD version for standard crankshaft dimensions and standard oil clearance. CR6640XP must therefore not be confused with the STDX version, which is for standard crankshaft with extra oil clearance, or the 0.5 version, which is for crankshaft ground 0.50 millimetres undersize.
King XP Series is developed for high-performance engines and motorsport, where ordinary standard bearings are not always sufficient. The bearings are built as trimetal bearings with steel backing, copper/lead bearing material and King’s pMaxBlack surface, providing high load capacity, improved wear resistance and a stable oil film at high RPM and load.
CR6640XP is used for rebuilds, tuning, trackday and motorsport where the crankshaft still has standard dimensions. Correct bearing clearance and crankshaft dimensions should always be verified by measurement during engine assembly.
Specifications:
Type: King XP connecting rod bearing set
Series: XP Series / pMaxBlack
Material: Trimetal copper/lead
Crankshaft: Standard size (STD)
Oil clearance: Standard oil clearance
Bearing type: Upper and lower connecting rod bearings
Contents: 12 bearing halves (6 complete connecting rod bearings)
King Engine Bearings part number: CR6640XP
Fits engine code:
M20B20 / M20B23 / M20B25 / M20B27 / M50B20 / M50B25 / M52B20 / M52B25 / M52B28 / M52TUB25 / M52TUB28 / M54B22 / M54B25 / M54B30
