ACL - Main bearing set for Renault F4R R3, version : 0.025

ACL Race Series main bearing shells with a repair rib of 0.025 mm are designed for very fine adjustments on Renault F4R R3 engines, particularly in cases of slight crankshaft withdrawal or moderate wear.

Thanks to their high-performance tri-metal structure (hardened steel, copper, lead/tin), these bearings offer exceptional load resistance, consistent oiling at high revolutions per minute and a significant reduction in friction, which is essential in competition.

Why choose ACL bearings with a 0.025 mm rib?

• Ideal for micrometric adjustments after micro-grinding
• Perfect for tuners requiring clearance controlled to the hundredth
• Designed to withstand extreme mechanical stress
• Suitable for intensive use: rally, track, hillclimb, endurance

Technical specifications:

• Supplier reference: ACL-5M7819H-0025
  
• Tolerance: Repair -0.025 mm (undersize)
• Material: Tri-metal alloy (steel + copper + lead/tin)
• Finish: High precision Motorsport
• Use: Competition engines, racing preparations, fine grinding

Key advantages:

• Ultra-fine adjustment for controlled clearance
• Exceptional thermal and mechanical stability
  
• Preservation of oil pressure even under heavy use
• Reduction of internal friction
• Perfect tolerance for slightly ground crankshafts
• Maximum total length: 19.05 mmMaximum axle size: 51.970 mm
  TMaximum tunnel size: 51.940 mmMaximum vertical oil clearance: 54.035 mm
  Maximum crown wall: 54,000 mm
  Minimum axle size: 0.050 mm
  Minimum tunnel size: 0.020 mm
  Minimum vertical oil clearance: 1,070 mm
  

Caution: These values are provided for information purposes only. It is essential to check the clearance using a feeler gauge or micrometer during installation.

Compatibility:

RENAULT

— F4R R3