ARP Automotive Racing Products
ARP Main Stud Kit, BMW M20
ARP Main Stud Kit, BMW M20
The ARP Main Stud Kit has been expertly designed to work seamlessly and replace BMW Part #11111735525 for the BMW M20 B20, B23, B25, B27 engines, which were utilized in various BMW models such as the E12, E21, E28, E30, E34 3 Series, 5 Series, and 6 Series.
Upgrading from factory main bolts to ARP Main Studs is a simple, yet greatly beneficial upgrade. ARP Main Studs offer the following benefits:
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.
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To ensure accurate torque readings and proper thread engagement, thoroughly clean all threads in the engine block. If necessary, use an ARP chaser to chase the threads.
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Before installing any hardware, carefully inspect and clean it for defects, shipping damage, and proper fit, length, and dimension.
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Gently screw the main studs into the engine block by hand until they are snug.
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Install the main caps, checking for any binding or misalignment.
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Apply ARP Ultra-torque fastener assembly lubricant to the threads of the studs, nuts, and washers. Install the washers and nuts onto the studs and tighten them by hand. It is highly recommended to use the ARP Ultra-torque fastener assembly lubricant provided with the kit, as it provides consistent clamping force and reduces friction on the studs. Do not use motor oil or other low-quality lubricants.
BMW M20B20 Applications:
BMW 3 Series
1977-1982 E21 320 / 326
1982-1994 E30 320i
BMW 5 Series
1977-1981 E12 520 / 526
1981-1987 E28 520i
BMW 7 Series
1981-1987 E23 720i
BMW M20B23 Applications:
BMW 3 Series
1977-1982 E21 323i
1982-1994 E30 323i
BMW M20B25 Applications:
BMW 3 Series
1985-1993 E30 325i / 325is / 325ix
BMW 5 Series
1987-1990 E34 525i
BMW M20B27 Applications:
BMW 3 Series
1982-1987 E30 325e / 325es [North America]
BMW 5 Series
1982-1987 E28 525e / 528e