A lubricant with too low of a viscosity cannot keep the metal surfaces separated, and metal-to-metal contact occurs.
A large majority of light-duty vehicles in the United States are powered with spark-ignition (SI) engines fueled with gasoline.
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There are four lubrication regimes - boundary, mixed, elastohydrodynamic and hydrodynamic. Boundary lubrication is associated with metal-to-metal contact between two sliding surfaces of the machine.
We generally want to avoid boundary lubrication where possible.
It is agreed among lubrication specialists that friction may be at its highest level during the boundary lubrication regime.
Several technologies have been developed to improve the efficiency of SI engines.
Boundary lubrication regimes occur during any condition where the asperities of two lubricated surfaces in relative motion may come into physical contact and the potential for abrasion and/or adhesion occurs.The present study examines these SI engine technologies in the context of their incremental improvements in reducing fuel consumption, as well as the associated costs of their implementation.It also discusses the mechanisms by which fuel consumption benefits are realized along with the interactions that these technologies have with the base-engine architecture. National Highway Traffic Safety Administration (NHTSA), U. Environmental Protection Agency (EPA), and other organizations. It is a domain with an extension and is hosted by Soft Layer Technologies Inc.. It has an estimated worth of $ 8.95 and has an average daily income of approximately $ 0.15.