ACL Bearings 4B1946HD-.25 Race Series Rod Bearing Set 0.25mm Undersize with Dowel Hole

The ACL Bearings 4B1946HD-.25 is a high-performance race series connecting rod bearing set engineered for Honda F18B and F20B inline 4-cylinder engines (1850cc-1997cc displacement). This set features a 0.25mm (0.010 inch) undersize journal dimension, designed for engines with reground crankshafts that have been machined to accommodate performance rebuilds.

Key Features:

• Tri-metal construction with steel backing, copper-lead alloy, and thin overlay for superior strength and seizure resistance
• HD designation indicates dowel hole location for precise alignment
• Race Series engineering with micron-tolerance machining for consistent wall thickness and optimal crush
• No flash plating on bearing backs to maximize heat transfer and improve bearing retention
• Hardened steel backing provides enhanced support for bearing lining under high-stress conditions
• Manufactured to exacting tolerances for reliable fit and consistent oil clearances

ACL Race Series bearings are designed to withstand elevated RPM, increased loads, and high-performance applications. The 0.25mm undersize accommodates crankshaft journals that have been reground during engine rebuilds, ensuring proper clearance and optimal bearing performance. Compatible with Honda Accord, Acura Integra, and other vehicles equipped with F18B or F20B engines.