ACL Race Series connecting rod bearings for Mitsubishi Evo X (4B11T)
Fits
Mitsubishi
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ACL Race Series connecting rod bearings for Mitsubishi Evo X (4B11T) (part number 4B1236H), designed for engines that will operate under much higher loads and at higher RPMs than stock.
Internally, they feature three layers on a high-strength steel backing: a copper-lead-tin lining, a thin nickel barrier, and a lead-tin-copper sliding layer, which is the one that interfaces with the crankshaft. In the connecting rod bearings, the surface layer is thinner to better withstand fatigue.
Race Series bearings have more housing interference and a slightly more eccentric shape than standard bearings, two details designed to ensure the bearing does not move and remains well-lubricated when the block and connecting rod deform under load.
In standard size, ACL specifies them for a connecting rod journal of 51.954 to 51.972 mm, with a bearing width of 17.0 mm. For this diameter, they recommend an oil clearance of approximately 0.055 to 0.065 mm, measured with a micrometer and bore gauge. If the crankshaft has been reground, the measurement changes.
They do not have the silver-tin final plating of standard bearings, so their dark color—ranging between brown, black, and bluish—is the factory finish 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 of additional 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.