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Lubricating Aspects of Automotive Fuels pdf Notes download
Pankaj Yadav

Lubricating Aspects of Automotive Fuels pdf Notes download

Pankaj Yadav | 28-Feb-2016 |
Lubricating Aspects of Automotive Fuels ,

Hi friends, here Pankaj Yadav uploaded notes for AUTOMOTIVE FUELS AND LUBRICANTS with title Lubricating Aspects of Automotive Fuels pdf Notes download. You can download this lecture notes, ebook by clicking on the below file name or icon.

1. Introduction
Back in the 1960s, the term “lubricity” was defined by Appeldorn and Dukek as: “If two
liquids have the same viscosity, and one gives lower friction, wear or scuffing, it is said to
have better lubricity”. It should be noted, however, that this definition was not strictly
applied and many researchers carried out lubricity experiments on fuels based on their own
understanding of the concept. The lubricating ability of fuels, because of their very low
viscosity, depends mostly on their boundary film-forming properties. Some moving parts of
diesel fuel pumps and injectors are protected from wear by the fuel. To avoid excessive
wear, the fuel must have some minimum level of lubricity. Lubricity is the ability to reduce
friction between solid surfaces in relative motion. The lubrication mechanism is a
combination of hydrodynamic lubrication and boundary lubrication. In hydrodynamic
lubrication, a layer of liquid prevents contact between the opposing metal surfaces. For
diesel fuel pumps and injectors, the liquid is the fuel itself and viscosity is not the key fuel
property as one could profoundly expect. The history of fuel lubricity is associated with
problems in engine performance as liquid-hydrocarbon based fuels must possess a
minimum of lubricating ability to be able to protect high-pressure injection pumps and
related fuel supply equipment from wear. The topic of gasoline lubricity has recently
become more urgent with the introduction of direct-injection gasoline engines, which will
necessitate high-pressure gasoline injection pumps, a development that is most likely to
place considerably more emphasis on the lubricating ability of gasoline, accelerating wear
especially in rotary distributor fuel pumps. According to pump manufacturers this loss of
lubricity may be the difference between fuels from a controlled laboratory environment and
a cost-conscious production environment

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