ACL Race Series connecting rod bearings for Toyota GT86 and Subaru BRZ (4U-GSE, FA20)
Fits
Toyota
Subaru
GT86BRZ- Shipping in 24-48 hSubject to availability
- 14 days to returnUnfitted and in its original packaging
- Pay in instalmentsFinance your purchase at checkout
- Collection at our shopCartagena, Spain
ACL Race Series connecting rod bearings for Toyota GT86 and Subaru BRZ (4U-GSE, FA20) (part number 4B8310H), designed for engines that will operate under much higher loads and higher RPMs than stock.
These are tri-metal bearings: SAE 1010 steel base, a copper, lead, and tin layer of approximately 0.3 mm, a nickel barrier, and a surface layer of lead, tin, and copper that conforms to the crankshaft surface and resists seizing. In the connecting rod bearings, the surface layer is thinner to better withstand fatigue.
ACL manufactures them with more "crush" (interference in the housing) than a standard bearing to ensure they are held securely and dissipate heat better, and with more eccentricity, which helps maintain the oil film when the housing deforms at high RPMs.
In standard size, ACL specifies them for a connecting rod journal of 49.976 to 50.000 mm, with a bearing width of 15.6 mm. For that diameter, they recommend an oil clearance of about 0.053 to 0.063 mm, measured with a micrometer and bore gauge. If the crankshaft is reground, the measurement changes.
They do not have the final silver tin coating of standard bearings, so their dark color—ranging between brown, black, and bluish—is factory-standard and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, they should be combined with the HX version, which provides 0.025 mm more clearance.
If the crankshaft has been reground or if you are unsure of the required size, please write to us with your engine code before ordering.