The saying “the devil is in the details” aptly describes the complexities surrounding fastener design, particularly in automotive applications. Automotive Racing Products (ARP), under Rick Feaster, specializes in creating high-grade fasteners tailored for racers, offering them in various alloys with tensile strengths ranging from 190,000 to 280,000 psi. Fasteners must be correctly stretched to achieve the desired clamping force and their efficacy is influenced by multiple factors, including type, diameter, and length.

ARP develops critical engine fasteners such as head studs, main studs, and connecting rod bolts, considering over ten design specifications, including counterbore depth and thread size. For high-performance engines, ARP recommends materials like ARP2000® and Custom Age 625+, depending on pressure levels.

An essential aspect of fastener effectiveness is the quality of threads. ARP emphasizes rolled threads, which enhance compressive strength and fatigue resilience, achieving tolerances based on SAE standards. They employ digital technology for precise quality control.

Moreover, regular maintenance of fasteners is crucial, particularly in high-stakes environments like drag races, where components can wear due to repeated tensions. Feaster advises measuring the length of rods prior to assembly and replacing any that stretch beyond specified limits. Lastly, ensuring the accuracy of torque wrenches is critical for optimal preload; ARP provides calibration services to prevent discrepancies that could lead to engine failures. For deeper insights, ARP’s extensive catalog is available online.



Source: www.dragzine.com