ACL Race Series Performance Engine Bearings
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A unique combination of design, metallurgy, and engineering delivers what drivers expect from high-performance Trimetal engine bearings.
Features
<L>- Designed to withstand higher RPM conditions. <L>
- High-strength overlay plate with reduced thickness for improved fatigue properties. <L>
- Hardened steel backs on all connecting rod bearings to improve bearing lining support and facilitate greater retention within the housing. <L>
- Increased crush for improved bearing seating. <L>
- Elimination of flash plating on the bearing backs to improve heat transfer through the bearing sands and maximize grip between the bearing and the housing. <L>
- Increased eccentricity to compensate for bore distortion at high RPM and to assist in the formation of a hydrodynamic oil film. <L>
- 3/4 grooved main bearings to optimize bearing load-carrying surface area and oil flow to the connecting rod bearings. <L>
- Tight and consistent wall tolerances to maintain precise clearance. <L>
- Enlarged ID chamfer on bearing edges to accommodate large fillet radii on performance crankshafts.
What is the maximum power rating for ACL Race Series bearings?
<L>An engine's power rating can be tuned in various ways, each with different impacts on the loads and stresses borne by the bearings. All of the following methods affect bearing load:
- Increasing redline engine speed <L>
- Increasing turbo boost / cylinder pressure <L>
- Changing timing and cam profiles <L>
- Use of lower viscosity oils or higher engine temperatures <L>
- Changes in crankshaft / connecting rod / piston design <L>
- Changes in cylinder dimensions (boring, stroke, decking cylinder heads)
Consequently, it is only practical to limit the issue to "maximum specific bearing load." This is the maximum load spread across the projected area of the bearing. To determine this, engine builders must understand peak cylinder pressures and balance these forces with inertial loads (acceleration of piston and connecting rod mass). Generally speaking, the material and design of ACL Race bearings allow for great flexibility in upgrading engine performance with an excellent balance of strength and tolerance. The trade-off is that higher loads lead to shorter lifespan. ACL Race bearings are rarely used at absolute maximum output, but they perform well in street machines where normal engine life is expected, as well as in "Top Fuel" dragster engines where, despite bearing loads of several hundred MPa, lifespan is measured in seconds.
<L>Ceramic Coating
Looking to reduce bearing friction and enhance anti-galling properties? If so, our advanced dry-film lubricant ceramic coating is exactly what you need. This coating bonds at 20 millionths of an inch, so there is no need to change clearances, and it can be buffed to "zero" tolerance while maintaining its properties. This coating significantly reduces power-robbing friction and aggressively retains an oil film even after sitting for months or during high-G racing when oil may be depleted, minimizing the possibility of bearing seizure. A must-have for those seeking bottom-end safety and longevity.
Before You Order
〇 Regarding Import Consumption Tax
At the Shaftoya shopping site, we pay the import consumption tax incurred upon import on your behalf, so there are no additional charges beyond the total amount paid at checkout.
〇Confirmation of Compatibility
All product databases are based on North American vehicles (USDM), so please confirm whether they can be installed on Japanese vehicles (JDM) before ordering. (If you are unsure if a listed product is compatible with your vehicle, please feel free to contact us. Our support team will be happy to check for you.)
If you order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, it does not necessarily mean they are compatible with Japanese-model vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of settlement. An estimate of shipping costs will be automatically calculated when you enter your shipping address on the checkout page. For large items such as body parts, there may occasionally be a significant discrepancy between the automatically calculated shipping amount and the actual cost. In such cases, we will contact you individually via email.
In principle, all products are shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please order with enough time to spare. If you are in a hurry, please contact us in advance to check delivery times. All products are transported via air freight. They will not be shipped by sea freight.
○ Regarding Compliance with Japanese Vehicle Inspection (Shaken)
In principle, all products we handle are designed and manufactured outside of Japan. Please note that they are not compliant with the "Japanese vehicle inspection system," and we cannot provide strength evaluation documents for that purpose. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product. We will only provide returns, refunds, or exchanges if you contact us within 7 days of receipt regarding damaged, defective, or incorrect items. Please note that for products sold through us, warranty support will be provided "only through us." We do not provide support through other companies or agencies located within Japan.