A unique combination of design, metallurgy, and engineering delivers what drivers expect from high-performance tri-metal engine bearings.
Features
- Designed to withstand higher RPM conditions.
- High-strength overlay plate with reduced thickness for improved fatigue properties.
- Hardened steel backs on all connecting rod bearings for improved bearing lining support and better retention in the housing.
- Increased crush for improved bearing retention.
- 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.
- Increased eccentricity to compensate for bore distortion at high RPM and assist in the formation of a hydrodynamic oil film.
- 3/4 grooved main bearings optimize bearing load-carrying surface area and oil flow to the connecting rod bearings.
- Tight and consistent wall tolerances to maintain consistent clearances.
- Enlarged ID chamfer on bearing edges necessary to accommodate large fillet radii on performance crankshafts.
What is the maximum power rating of ACL Race series bearings?
An engine's power rating can be tuned in various ways, which in turn has different effects on the loads and stresses borne by the bearings. All of the following methods affect bearing load:
- Increasing redline engine speed
- Increasing turbo boost / cylinder pressure
- Changes to timing and cam profiles
- Use of lower viscosity oils or higher engine temperatures
- Changes to crankshaft / connecting rod / piston design
- Changes to cylinder dimensions (boring, stroke, deck machining)
As a result, it is only realistic to limit the issue to "maximum specific bearing load." This is the maximum load the bearing spreads across its projected area. For 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 mean a shorter lifespan. ACL Race bearings are rarely used at their maximum output, but they perform well in everything from street machines where normal engine life is expected, to "Top Fuel" dragster engines where bearing loads are in the hundreds of MPa and life is measured in seconds.
Ceramic Coating
Looking to reduce bearing friction and enhance anti-seizure properties? In that case, our advanced dry-film lubricant ceramic coating is what you need. This coating bonds at 20 millionths of an inch, so there is no need to change clearances, and it can even be buffed to "zero" tolerance while maintaining its properties. This coating significantly reduces power-robbing friction and actively maintains an oil film even after sitting for months or following oil starvation during high-G racing, minimizing the possibility of bearing seizure. A must-have item for those seeking bottom-end safety and longevity.
Before Ordering
〇Regarding Import Consumption Tax
At the Shaftoya shopping site, we pay the import consumption tax incurred at the time of import on your behalf, so there will be no additional charges beyond the total amount paid at checkout.
〇Confirmation of Compatibility
Since all product databases are based on North American vehicles (USDM), please confirm compatibility with Japanese vehicles (JDM) before ordering. (Please feel free to contact us if you are unsure if the listed product is compatible with your vehicle. Our support team will 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 will fit 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 Delivery
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 cost and the actual shipping cost. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our US warehouse. Unlike domestic Japanese shipping, 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. Note that all products are transported by air. They are not shipped by sea freight.
○Regarding Japanese Vehicle Inspection Compatibility
The products we handle are basically all designed and manufactured outside of Japan. Please understand that they do not conform to the "Japanese vehicle inspection system" (shaken) at all, and we cannot provide strength calculation documents for the Japanese vehicle inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and please install and use them at your own risk.
○Regarding Warranty
Please check the contents of your order as soon as it arrives. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging box or the product. Please understand that we will only provide returns, refunds, or replacement exchanges if you contact us within 7 days of receipt regarding products with shipping damage, defective products, or products different from what you ordered. Please note that for products sold through our company, warranty support will be provided "only through us." Please understand that we do not provide support through other companies or distributors located in Japan.