ACL Bearings 4B1925HD-STD Race Series Connecting Rod Bearing Set Pre-Drilled for BME Rods

The ACL Bearings 4B1925HD-STD is a high-performance tri-metal connecting rod bearing set specifically pre-drilled for use with BME aftermarket connecting rods in Honda and Acura B18C VTEC engines. This Race Series bearing set combines precision engineering with race-proven metallurgy to deliver exceptional performance and reliability in high-RPM engine builds.

Advanced Tri-Metal Construction:

• High-strength overlay plate with reduced thickness for improved fatigue properties and durability under extreme loads
• Hardened steel backing on all rod bearings to improve support and assist with bearing retention in the housing
• Engineered blend of materials provides high strength and excellent seizure resistance
• No flash plating on bearing backs to maximize heat transfer and improve grip between bearing and housing

Precision Manufacturing:

• Micron-tolerance machining ensures consistent accuracy in critical dimensions like wall thickness and crush
• Tight, consistent wall tolerances help maintain proper clearances during assembly and operation
• Increased crush for improved bearing retention under high-stress conditions
• Enlarged inner diameter chamfers on bearing edges accommodate large fillet radius performance crankshafts

Performance Features:

• Pre-drilled specifically for BME connecting rods - no additional machining required
• Increased eccentricity compensates for bore distortion at high RPM and assists in hydrodynamic oil film formation
• Standard size (STD) bearings for stock or standard-ground crankshaft journals
• Complete set includes 8 bearing halves for 4 connecting rods

ACL Race Series bearings are manufactured to exacting tolerances and are designed specifically for high-performance and racing applications where durability and precision matter most. These bearings deliver the strength and reliability needed for modified engines operating at elevated RPM ranges.