ACL Bearings 4B1609H-.25 Performance Rod Bearing Set Oversize - 25mm

The ACL Race Series 4B1609H-.25 is a high-performance connecting rod bearing set engineered for Volkswagen and Audi 4-cylinder engines including 1.4i, 1.6i, 1.8T, and 2.0 TFSI applications. This .25mm (0.010") oversize bearing set is designed for engines with reground crankshafts or performance builds requiring precise bearing clearances.

Advanced Tri-Metal Construction:

• F781 tri-metal copper-lead alloy bearing material for superior durability
• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Hardened steel backing on all rod bearings for enhanced support and retention
• Elimination of flash plating on bearing backs improves heat transfer and housing grip

Performance Engineering Features:

• Designed to withstand higher RPM conditions in performance and racing applications
• Increased crush for improved bearing retention under extreme loads
• Increased eccentricity compensates for bore distortion at high RPM
• Optimized oil grooves and distribution for superior lubrication
• Notchless design for specific engine applications

Technical Specifications:

• Bearing size: .25mm (0.010") oversize
• Maximum shaft size: 47.778mm (1.881")
• Maximum tunnel size: 50.619mm (1.993")
• Maximum overall length: 19mm (0.748")
• Wall thickness at crown: 1.405mm (0.055")
• Recommended oil clearance: 0.012-0.067mm (0.0005-0.0026")

ACL bearings are specifically manufactured for engine tuning and performance upgrades where superior quality and higher bearing capacity are essential. Compatible with Audi A3, A4, A6, TT and Volkswagen Polo, Golf, Jetta, Eos, and Passat models from 2000 onwards with applicable engine codes.