ACL has a proud & rich history in Motorsport – it is in our 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
Whatever your application we have you covered – if you are looking for the best – demand the best.
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.
ACL Race Series performance engine bearings are identified from the standard range by the following suffixes:
H = ACL Race Series
HX = ACL Race Series with 0.025mm (0.001”) extra clearance
HD = ACL Race Series with location dowel holes.*
HXD = ACL Race Series with 0.025mm (0.001”) extra clearance and location dowel holes.*
*Connecting rod bearing applications only
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 (180o) 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.
Enlarged ID Chamfers
Accommodate larger fillet radii on performance crankshafts.
Calico Coated Bearings
Coated Bearings
Long term players in the performance engine bearing industry ACL RACE Series Performance Engine Bearings & Calico Coatings have formed a collaboration to offer users an additional option in performance engine building. ACL and Calico are, respectively, technological leaders in the fields of performance engine bearings and performance coatings. Both companies have exemplary reputations for quality, performance & knowledge in their areas of specialization
ACL engine bearings have been coated by Calico for individuals for over 15 years, with proven compatibility and an established track record of excellence in the most exacting and extreme performance applications
ACL and Calico both have rich histories in motorsport, the racetrack is the perfect proving ground. This alliance culminates in the release of ACL offering a range of Calico coated ACL RACE Series Performance Engine Bearings.
The coated range is available through all current ACL distributors.
Description
Our coated bearings combine ACL’s tough RACE Series lining and overlay metallurgy with Calico’s well renowned CT-1 coating.
CT-1 is a Dry Film Lubricant coating that helps reduce friction and abrasive wear. It provides intermittent dry lubrication and is not affected by dust or dirt. CT-1 is specifically engineered to withstand the extreme conditions of today’s high performance engines. Professional engine builders enjoy a higher level of confidence with increased embedability, strength and durability.
Process
CT-1 Dry Film Lubricant coating is applied as a spray process. Different surface preparation methods appropriate for the substrates will be used prior to the coating process. Coating thickness is varied to suit the application. Typical coating thickness for engine bearings is 0.00025” to 0.00030” inch (6 to 7.5 microns)
Advantages
Provides intermittent dry lubrication, not affected by dust or dirt, low coefficient of friction. Thin coating to accommodate assembly constraints, chemical resistance, corrosion protection, reduced friction and drag resulting in decreased parasitic losses.
- Corrosion Protection
- Increased Lubricity
- Low Coefficient of Friction
- Oil and Fuel Resistant
Embedability
CT-1 coated bearings have excellent embedability characteristics, allowing debris contaminates to embed in the bearing, avoiding damage to the crank
Extreme oil temperatures
CT-1 coated bearings have shown a reduction in oil temperatures as much as 8°C - 11°C / 15˚F - 20˚F. Lower oil temperatures also aid in the loss of viscosity due to extreme heat.
Low oil pressure/Oil starvation
Theoretically a crankshaft rides on a thin film of oil that protects both the crank and bearing. Real world experience such as cold starts and rough terrain conditions have proven otherwise. CT-1 coated engine bearings provide a dry film lubricant that protects against intermediate oil starvation
Applications
- Conrod Bearings
- Main Bearings
- Camshaft Bearings
- Thrust Washers
- Bushes
