ACL Bearings 4B1912HX-STD Race Series Connecting Rod Bearing Set with Extra Clearance

The ACL Bearings 4B1912HX-STD Race Series Connecting Rod Bearing Set is engineered for high-performance Honda engines including F20C, F22C, H22A, and H22Z applications. This standard size bearing set features an extra 0.001 inch (0.025mm) oil clearance compared to standard H-series bearings, achieved through a 0.0005 inch thinner wall thickness designed specifically for high-RPM and boosted applications.

Advanced Race Series Construction:

• Tri-metal design with hardened steel backing for superior strength and bearing retention
• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Lead, tin, and copper overlay material for excellent wear characteristics
• Chamfered edges to accommodate larger fillet radii on performance crankshafts
• Bearing width: 0.764 inches
• Increased crush design for improved bearing retention in the housing
• Enhanced eccentricity to compensate for bore distortion at high RPM

Performance Engineering Features:

• No flash plating on bearing backs for improved heat transfer and maximum grip
• Manufactured to exacting tolerances for consistent wall thickness and reliable clearances
• Designed to withstand extreme endurance under harsh racing conditions

ACL Race Series bearings are a proven choice among engine builders and racers, with a motorsport heritage that includes Formula 1 and championship-winning engines across multiple racing disciplines. These bearings deliver the durability and performance demanded by high-RPM, high-boost builds where standard bearings fall short.