ACL 4B1925H-STD Race Rod Bearing Set Standard Honda B18C1 B18C5 Integra GSR ITR

Vehicle Fitment

• 1994-2001 Acura Integra GS-R DC2/DB8 (B18C1, 1.8L DOHC 16v VTEC, 170 hp - USDM)
• 1997-2001 Acura Integra Type R DC2 (B18C5, 1.8L DOHC 16v VTEC, 195 hp - USDM/CDM)
• 1995-2001 Honda Integra Type R DC2/DB8 (JDM B18C Spec R / B18C3, 1.8L DOHC 16v VTEC, 200 hp)
• 1994-2001 Honda Integra VTi-R (B18C2, 1.8L DOHC 16v VTEC - Australia/New Zealand)
• 1999-2001 Honda Integra Type R (B18C7, 1.8L DOHC 16v VTEC - Australia)

Fitment Notes

• Standard (STD) crankshaft rod journal diameter - for use with stock or unworn crankpins at factory diameter only. For reground crankshafts, use 4B1925H-.025 (+0.025mm) or 4B1925H-.25 (+0.25mm) as appropriate.
• An HX extra-clearance variant (4B1925HX-STD) is also available for builders targeting approximately 0.025mm (0.001") additional running clearance at standard journal diameter without crankshaft grinding.
• Always measure crankshaft rod journal diameter with a micrometer before selecting bearing size. Confirm actual clearance with Plastigage or a dial bore gauge after assembly.
• Sold as a complete set of 8 bearing shells - sufficient for one full 4-cylinder engine build.

Features

• Tri-metal construction: copper-lead alloy lining bonded over a hardened steel backing, with a high-strength overlay plate - engineered for the high-RPM, VTEC demands of built B18C applications in both naturally aspirated and forced-induction configurations.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under high sustained loads and temperatures.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in boosted or high-revving B18C builds operating above factory power levels.
• Increased bearing crush and tighter wall tolerances ensure consistent, secure seating in the connecting rod housing bore, reducing the risk of bearing spin.
• Enlarged ID chamfers on bearing edges accommodate the larger fillet radii found on performance and aftermarket B18C crankshafts.
• 3/4-groove design optimizes oil supply to the rod journal and maximizes load-carrying surface area across the bearing face.
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip between the bearing shell and the rod housing bore.
• Increased eccentricity compensates for bore distortion at high RPM and assists in the formation of a stable hydrodynamic oil film under load.

Specifications

• Part Number: 4B1925H-STD
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: Honda/Acura B18C1, B18C2, B18C3 (JDM), B18C5, B18C7 - 1.8L DOHC 16v VTEC Inline-4 (1797cc)
• Crankshaft Size: Standard (STD - Unground)
• Shaft (Crankpin) Diameter: 44.976-45.000mm (1.7707-1.7717 in)
• Tunnel (Housing Bore): 48.000-48.024mm (1.8898-1.8907 in)
• Maximum Wall Thickness at Crown: 1.502mm (0.0591 in)
• Maximum Overall Length: 17.5mm (0.689 in)
• Bearing Material: Tri-Metal Copper-Lead Alloy / Hardened Steel Backing
• Quantity: Set of 8 Shells (complete engine set)

Included Components

• 8x Race Series Connecting Rod Bearing Shells - Standard Size

Product Description

The ACL Race Series 4B1925H-STD connecting rod bearing set is the standard-size performance replacement for the Honda/Acura B18C VTEC inline-4 engine family - the 1.8L DOHC 16v VTEC engine powering the Acura Integra GS-R (B18C1), Acura Integra Type R (B18C5), and the legendary Honda Integra Type R DC2 (JDM B18C/B18C3), among other regional variants. Designed for use with stock-diameter, unground crankshaft rod journals, this is the standard selection for fresh engine builds using a serviceable factory crankshaft confirmed to be within standard dimensional tolerance.

The B18C family - particularly the B18C5 and JDM Type R spec - is one of the most frequently rebuilt high-performance Honda four-cylinder engines, known for its high specific output, free-revving character, and wide aftermarket support. ACL Race Series bearings deliver meaningfully superior fatigue resistance, bearing retention, and oil film stability over OEM Honda shells, making them a standard specification for serious B18C rebuilds at any power level. For builders targeting increased running clearance at standard journal size, the HX variant (4B1925HX-STD) is available separately. Always confirm clearances at assembly. Sold as a complete set of 8 shells for one engine.