ACL 4B8366H-.50 Race Rod Bearing Set +0.50mm Toyota 3S-GE 3S-GTE Celica MR2

Vehicle Fitment

• 1984-2005 Toyota Celica (T160/T180/T200) - 3S-GE 2.0L DOHC 16v (Gen 1-5, Naturally Aspirated)
• 1986-1989 Toyota Celica GT-FOUR (ST165) - 3S-GTE 2.0L DOHC 16v Turbo (Gen 1)
• 1990-1993 Toyota Celica GT-FOUR / All-Trac (ST185) - 3S-GTE 2.0L DOHC 16v Turbo (Gen 2)
• 1994-1999 Toyota Celica GT-FOUR (ST205) - 3S-GTE 2.0L DOHC 16v Turbo (Gen 3)
• 1990-1999 Toyota MR2 (SW20) - 3S-GE and 3S-GTE variants
• 1994-2002 Toyota Caldina GT-T / GT-Four (ST215W/ST246W) - 3S-GTE 2.0L Turbo (Gen 4/5)
• 1997-2005 Toyota Altezza RS200 (SXE10) - 3S-GE BEAMS 2.0L DOHC (Gen 5)
• Various Toyota Corona, Carina, Camry, RAV4 - 3S-GE naturally aspirated variants by generation

Fitment Notes

• The .50 suffix designates this as the +0.50mm oversize bearing set - intended for use when the crankshaft rod journals have been ground 0.50mm undersize. This is a more significant regrind step, typically selected when journals have suffered deeper wear, scoring, or damage requiring removal of more material than the standard .025mm or .25mm regrind steps can address.
• Do NOT use on a stock, unground crankshaft. For standard journal diameter, use 4B8366H-STD. For crankpins ground 0.025mm undersize, use 4B8366H-.025. For crankpins ground 0.25mm undersize, use 4B8366H-.25.
• Covers all five generations of the naturally aspirated 3S-GE (1984-2005) and all four generations of the turbocharged 3S-GTE (1986-2007) - all share the same crankpin journal dimensions across every generation.
• Always have crankshaft journals measured by a machine shop before selecting oversize. 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 demands of the naturally aspirated 3S-GE and the sustained boost loads of the turbocharged 3S-GTE.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under high sustained loads and temperatures - particularly critical in boosted 3S-GTE applications.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - a meaningful upgrade for any rebuilt 3S-series engine targeting performance reliability.
• 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 3S-series 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: 4B8366H-.50
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: Toyota 3S-GE 2.0L DOHC 16v (all 5 generations, 1984-2005, Naturally Aspirated); Toyota 3S-GTE 2.0L DOHC 16v Turbo (Gen 1-4, 1986-2007)
• Crankshaft Size: +0.50mm Oversize (for crankpins ground 0.50mm undersize)
• Shaft (Crankpin) Diameter: 47.485-47.500mm (1.8694-1.8701 in)
• Tunnel (Housing Bore): 51.004-51.024mm (2.0080-2.0088 in)
• Maximum Wall Thickness at Crown: approx. 1.738mm (0.0684 in)
• Maximum Overall Length: 21.3mm (0.839 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 - +0.50mm Oversize

Product Description

The ACL Race Series 4B8366H-.50 connecting rod bearing set is the +0.50mm oversize option for Toyota's 3S-GE and 3S-GTE inline-4 engine family - spanning the naturally aspirated 3S-GE across five generations (1984-2005) and the turbocharged 3S-GTE across four generations (1986-2007), as fitted to the Celica GT-FOUR, MR2, Caldina GT-T/GT-Four, Altezza RS200, and related Toyota performance platforms. The .50mm oversize is selected when crankshaft rod journals have been ground 0.50mm undersize - a more significant material removal step typically required when journals have suffered deeper wear or surface damage beyond what a standard .025mm or .25mm regrind can correct.

All generations of the 3S-GE and 3S-GTE share identical crankpin journal dimensions, making this a single set for all listed applications at the +0.50mm oversize. Built on ACL's Race Series tri-metal platform, these bearings deliver superior fatigue resistance and oil film stability over OEM Toyota shells - important in any serious 3S engine rebuild, and particularly so in turbocharged 3S-GTE applications where rod bearing loads are elevated by boost pressure. Always verify crankshaft journal diameter at the machine shop and confirm clearances at assembly. Sold as a complete set of 8 shells for one engine.