BMW B48 ARP Main Stud Kit
This ARP Main Stud Kit is designed for the BMW B48 Engine Upgrading from factory main bolts to ARP Main Studs is a simple, yet greatly beneficial upgrade. ARP Main Studs offer the following benefits: - Uniform Clamping Force: ARP Main Studs provide a uniform clamping force that OEM bolts cannot. With the improved distribution of pressure across main bearing caps comes better, more precise crank alignment for stability and longevity. - Improved Block Stability and Rigidity: ARP Main Studs improve block rigidity and therefore stability. This ensures maximum power transfer from the crank to the drivetrain, which in turn ensures: - Improved Throttle Response - Greater Horsepower - Higher Torque Output - Prevent Main Cap Walk: This occurs as main caps shift and move out of position, which can cause crank and engine damage - Reduced Risk of Fastener Stretching: Under high RPM applications and high loads, factory main bolts are prone to stretching and deforming. ARP uses advanced manufacturing techniques and high quality materials for hardware that is much less prone to deformation under load. - Safeguard Engine Block Threads: Because ARP Main Studs have unmatched tensile strength, they are much less likely to deform or strip block threads under high loads. Additionally, ARP’s precision machining and manufacturing ensures that stud threads are both highly accurate and consistent. When opting for main studs instead of factory bolts, it's important to note that the engine builder should mic the bores. Using studs may require a line hone to ensure proper fitment and alignment. A line hone is a machining process that can be used to resize and reshape the main bearing bores, ensuring that they are perfectly round and concentric. This is crucial for ensuring proper oil clearance and preventing premature bearing wear. By mic'ing the bores and performing a line hone if necessary, engine builders can ensure that the main studs are installed correctly and that the engine will perform reliably and at its best. Installation Instructions Thoroughly clean all threaded holes in the engine block. If necessary, use an ARP thread chaser to ensure clean threads and proper engagement. Inspect all studs, nuts, and washers for damage and verify proper fit, length, and dimensions before installation. Install the main studs into the engine block by hand until snug. Do not overtighten. Install the main caps and check for proper fit, alignment, and any binding. Apply ARP Ultra-Torque Fastener Assembly Lubricant to the stud threads, nuts, washers, and washer contact surfaces. Install the washers and nuts and tighten them by hand. Do not substitute motor oil or other lubricants for ARP Ultra-Torque. Following the manufacturer's recommended main-cap tightening sequence, torque all main stud nuts progressively in three steps using ARP Ultra-Torque: Step 1: 20 ft-lbsStep 2: 40 ft-lbsStep 3: 60 ft-lbs After final torque, measure the main bearing bores and verify proper size, roundness, and alignment. If necessary, line hone the main bores with the ARP main studs installed and torqued to specification. Verify final main bearing oil clearances before engine assembly. BMW B48 Applications: 1 Series 2016-2019 F20 120i / 125i2019-2023 F40 118i / 120i / 128ti / 135i / M135i2024-Present F70 120 / M135i 2 Series 2014-2021 F22/F23 218i / 220i / 230i2014-2017 F45 220 / 225i2021-Present G42 218i / 220i / 230i2021-Present U06 223i2020-2024 F44 218i / 220i / 228i / M235i2025-Present F74 M235 3 Series 2015-2019 F30/F31/F34 320i / 330i / 330e2018-Present G20/G21 318i / 320i / 330i / 330e 4 Series 2016-2019 F32/F33/F36 420i / 430i2020-Present G22/G23/G26 420i / 430i / 430e 5 Series 2017-Present G30/G31 520i / 530i / 530e 6 Series 2017-Present G32 630i 7 Series 2015-2022 G11/G12 730i / 730Li / 740e / 740Le X1 Series 2015-2022 F48 sDrive18i / sDrive20i / xDrive20i / 25i / xDrive25i / 28i2022-Present U11 sDrive18i / xDrive20i / xDrive28i / M35i X2 Series 2018-2023 F39 sDrive18i / sDrive20i / xDrive20i / 25i / xDrive25i / 28i / M35i2023-Present U10 xDrive28i / M35i X3 Series 2017-2024 G01 sDrive20i / xDrive20i / xDrive30i / xDrive30e2025-Present G45 xDrive20e / xDrive30e X4 Series 2018-Present G02 xDrive20i / xDrive30i X5 Series 2018-Present G05 xDrive25i / sDrive25i Z Series 2018-Present G29 Z4 sDrive20i / sDrive30i Toyota B48 Applications: A90 / A91 Supra 2019-Present J29/DB82/DB22 Supra2020-Present GR Supra 2.0 MINI B48 Applications: MINI Hatch [F55/F56/F57] 2014-Present Cooper S2015-Present John Cooper Works (JCW) MINI Clubman [F54] 2015-Present Cooper S2016-Present John Cooper Works (JCW) MINI Convertible [F57] 2016-Present Cooper S2016-Present John Cooper Works (JCW)