ACL Main Bearing Set 0.50mm/20 Thou suit Holden 3.8 4M2299 020

ACL has a proud & rich history in Motorsport – it is in their DNA. There is no better proving ground than the racetrack whatever it’s configuration. In the heat of competition proven technology always comes through.

The ACL RACE Series performance engine bearing range of today has a strong pedigree in motorsport & traces its roots back to the 1960’s with the manufacture of engine bearings for use in the world conquering Brabham Formula 1. Further experience in the Australian Supercars Championship & numerous other race codes has culminated in the current ACL RACE Series technology platform. The unique combination of design, metallurgy, engineering & precision quality control come together to deliver what engine builders expect from performance engine bearings

Precision Manufacturing

ACL Race Series performance engine bearings are manufactured to exacting tolerances. Micron tolerance machining supported by precision measurement systems delivers consistent accuracy to key characteristics like wall thickness and crush. This ensures reliable fit and helps maintain consistent clearances.

Bearing Material Enhancements

A blend of characteristics to provide high strength and crankshafts. excellent seizure resistance.

No flash plating is applied to further improve bearing retention and maximise heat transfer.

Bearing Design Enhancements

• Crush increased for:

  • Improved bearing retention from higher radial contact pressure. Locks the bearing into the housing.

  • More effective heat dissipation through improved thermal transfer.

• Bearing Eccentricity

  • Definition: Gradual reduction in wall thickness between the crown and parting line.

  • ACL Race Series performance engine bearings feature increased eccentricity to increase improve shape adaptation to compensate for bore distortion at high speed operation.

  • Assists in the formation of hydrodynamic oil film.

• Main Bearings with Extended Grooves

  • Full (180°) grooved uppers with matching partial groove in lowers.
  • Reduces interruption to big end oil supply.

  • Tapered groove run-out.

  • Smooths big end supply cut-off avoiding pressure pulsing and cavitation.