Browse Publications Technical Papers 2000-01-0917

Redesign of an Exhaust Manifold Outlet Fastener Using Robust Design Techniques 2000-01-0917

An L16 orthogonal array parameter Design of Experiment (DOE) evaluated six design parameters of the mating thread interface between the exhaust manifold outlet flange and jointing stainless steel fastener. The objective of this study was to identify optimal parameters for the redesign the thread interface by ensuring 100% seating of the fastener into the manifold flange (here after referred to as stud seating). Since the current fastener and manifold outlet flange interface threads do not always achieve the design objectives, due in part to a form of abrasive wear, consideration was given to develop a testing strategy that would quantify the amount of remaining thread engagement for a given stud length. This testing strategy ensured that the control parameters considered in this experiment would reveal main effects and interactions between the stud and tapped hole threads thus providing the necessary parameters for the redesign on the joint threads. It will be shown that significant interaction between stud out-of-round and fastener coating lead to improved stud performance when used with certain manifold materials while other thread features and fastener coating lead to other results. The previously mentioned findings provided the necessary information to the redesign of the manifold outlet flange and joining fastener threads.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Desirability of a Large-Bore Engine


View Details


Recent Developments in Poppet Valves


View Details


Thermo-Mechanical Analysis of a Cast Iron Exhaust Manifold: a Comparison Between the Traditional and a New Methodology


View Details