ACL 4B1912H-STD Race Rod Bearing Set Standard Honda F20C F22C H22A S2000 Prelude

Vehicle Fitment

• 2000-2005 Honda S2000 AP1 (F20C1/F20C2, 2.0L DOHC 16v VTEC, 237-247 hp)
• 2004-2009 Honda S2000 AP2 (F22C1, 2.2L DOHC 16v VTEC, 239 hp)
• 1991-1996 Honda Prelude IV (BB1/BB3/BB4) - H22A1, H22A2 (2.2L DOHC 16v VTEC)
• 1997-2001 Honda Prelude V (BB5/BB6/BB7/BB8) - H22A2, H22A4, H22A5, H22A8, H22Z1 (2.2L DOHC 16v VTEC)
• 1997-2002 Honda Accord VI Type-R - H22A7 (2.2L DOHC 16v VTEC)

Fitment Notes

• Standard (STD) crankshaft rod journal diameter - for use with stock or unworn crankpins at factory diameter only. For reground crankshafts, use 4B1912H-.025 (+0.025mm) or 4B1912H-.25 (+0.25mm) as appropriate.
• An HX extra-clearance variant (4B1912HX-STD) is also available for builders targeting approximately 0.025mm (0.001") additional running clearance at standard journal diameter without crankshaft grinding.
• The F20C/F22C and H22A/H22Z engine families share identical crankpin journal dimensions - a single bearing set fits all variants listed above at standard crankshaft size.
• 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 extreme high-RPM demands of the F20C (9,000 rpm redline) and H22A VTEC engines.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under the sustained high-RPM loads characteristic of naturally aspirated Honda performance engines.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in high-revving S2000 and Prelude builds at or above the factory power ceiling.
• 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 Honda 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: 4B1912H-STD
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: Honda F20C1, F20C2 (1997cc); Honda F22C1 (2157cc); Honda H22A1, H22A2, H22A4, H22A5, H22A7, H22A8, H22Z1 (2157cc)
• Crankshaft Size: Standard (STD - Unground)
• Shaft (Crankpin) Diameter: 47.980-48.000mm (1.8890-1.8898 in)
• Tunnel (Housing Bore): 51.004-51.024mm (2.0080-2.0088 in)
• Maximum Wall Thickness at Crown: 1.496mm (0.0589 in)
• Maximum Overall Length: 19.4mm (0.764 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 4B1912H-STD connecting rod bearing set is the standard-size performance replacement for the Honda F20C, F22C, and H22A/H22Z DOHC VTEC inline-4 engine family - covering the legendary Honda S2000 AP1 and AP2 (2000-2009), the Honda Prelude IV and V (1991-2001), and the Accord Type-R. 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 F20C and F22C engines are renowned for their extreme rev ceiling - 9,000 rpm or higher in F20C form - placing exceptional demands on rod bearing fatigue resistance and oil film stability at elevated RPM. ACL Race Series bearings deliver meaningfully superior performance in both areas versus OEM Honda shells, making them a standard specification for any serious S2000 or Prelude rebuild. The F20C/F22C and H22A/H22Z families share identical crankpin journal dimensions, so this single set covers all listed applications. For builders targeting increased running clearance at standard journal size, the HX variant (4B1912HX-STD) is available separately. Always confirm clearances at assembly. Sold as a complete set of 8 shells for one engine.