King Engine Bearings MB7089XP STDX XP Series Tri-Metal Race Main Bearing Set VW VR6 2.8L

The King Engine Bearings MB7089XP STDX is a race-grade, XP Series tri-metal crankshaft main bearing set engineered for Volkswagen VR6 2.8L engines. Designed for high-load, long-duration racing applications that demand more than conventional bearings can deliver, this set features King's proprietary pMaxBlack™ tri-metal construction — the same technology trusted by world-record-setting engine builders.

This STDX size offers standard crankshaft diameter with +0.001" extra oil clearance over stock, making it ideal for performance builds running forged steel aftermarket crankshafts under sustained high-load conditions. The set includes 7 pairs of main bearing shells.

pMaxBlack™ Tri-Metal Construction:

• Enhanced copper-lead intermediate layer with 4.5% tin content — 22% harder (115 HV) than conventional race bearings, with a load capacity of 17,000 psi
• Proprietary nano-scaled hardening process applied to the overlay creates a black fatigue-resistant shield, achieving 18.1 HV hardness and 10,200 psi overlay load capacity
• Overall load capacity is 15%–30% greater than traditional bearings
• SecureBond™ micro-etch adhesion process bonds the intermediate and overlay layers for superior structural integrity and delamination resistance under extreme loads
• Steel-backed construction with nickel barrier plate and lead/tin/copper Babbitt overlay

XP Series Geometric Features:

• Bull's Eye Tolerance™ — industry-leading wall thickness tolerance of ±0.0001", matched shell-to-shell for precise oil clearance consistency
• Narrowed design provides clearance for large-radius crankshaft fillets
• Enlarged, chamfered oil holes with ½ grooved upper shells for optimized oil flow and uncompromised lower shell load capacity
• Medium eccentricity geometry for optimum hydrodynamic load distribution
• 0.0005" hardened performance overlay resists surface fatigue under sustained high-RPM operation

Ideal Applications:

• Circle track, off-road, and offshore racing
• High-load, long-duration performance builds using forged steel crankshafts
• Engine rebuilds requiring tighter-than-stock oil clearances

King Engine Bearings has specialized exclusively in engine bearings since 1960, engineering every product in-house from concept through manufacturing. The XP Series represents their top-tier racing bearing technology, built to withstand the extreme loads and RPMs of today's most demanding competition engines.

Part Number: MB7089XP STDX  |  Set Quantity: 7 Pairs  |  Size: Standard +0.001" Extra Clearance  |  Material: Tri-Metal Copper/Lead/Nickel