ACL Main Bearings – Subaru BRZ (ZC6) / Toyota 86 (ZN6) / Subaru WRX (VA) – FA20

ACL Main Bearings – STD Specifications

Standard Size Details (STD)

• Size: STD
• Half Type: Identical halves
• Material: F780
• Minimum Standard Shaft Size: 67.985 mm / 2.6766 in
• Maximum Standard Shaft Size: 68.009 mm / 2.6775 in
• Minimum Standard Tunnel Size: 73.000 mm / 2.8740 in
• Maximum Standard Tunnel Size: 73.016 mm / 2.8746 in
• Maximum Wall Thickness at Crown: 2.505 mm / 0.0986 in
• Maximum Overall Length:
  • 17.6 mm / 0.6929 in (8312H)
  • 14.5 mm / 0.5709 in (8313H)
  • 22.92 mm / 0.9024 in (8314H(F))

Design & Performance Features

• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Hardened steel backing to improve bearing lining support and housing retention
• Increased crush for enhanced bearing retention
• Flash plating eliminated on bearing backs to improve heat transfer and housing grip
• Increased eccentricity to compensate for bore distortion at high RPM
• 3/4 grooved main bearings for optimised load capacity and oil flow to conrod bearings
• Tight, consistent wall tolerances for accurate and repeatable oil clearances
• Enlarged internal chamfers to suit performance crankshafts with large fillet radii

Engine & Vehicle Fitment