of this project is the “selection of lubricating oils for varied engines
performance”. The aim is to specify the adequate lubricating oils for different
engines. Using some equipment like hydrometer, flash point tester, and
visometer, the proportion of lubricating oils like specific gravity, flash
point and viscosity were found. These analysis were carried out on four
different kinds of lubricating oils and the variation in their properties were
found that different engines uses different lubricating oils. The selection of
these lubricating for the chosen engines are based on the following factors:
1. the design of the engine
2. its operating conditions
3. the fuel it uses and
4. the period of invention of the engine.
Moreover, the manufacturer of the engine specify the lubricating
oil the particular engine will use since they have profound knowledge of the
DEFINITION OF LUBRICATING OILS
oils are those heavy fractions of fractional distillation of crude oil which is
blended with additions and which are used to reduce friction between moving
surfaces. They are distinguished from other fractions of crude oil by their high
boiling point [which is greater than 4000c]
and their high viscosity.
1.2 TYPES OF LUBRICATING OILS
Lubricating oils are of two types, namely
1. automotive lubricating oils
2. industrial lubricating oils
Automotive lubricants are the fluid films applied mostly to the
automotive parts it comprises of the following:
1. engine oils [petrol and diesel]
2. hydrolic oils
3. compressor oils
4. gear oils
INDUSTRIAL LUBRICATING OILS
lubricants are those lubricants that are used in heavy industrial equipment. It
1. heat transfer oils
2. transmission oils
1.3 THE NEED FOR LUBRICATING OILS IN ENGINES
When one solid surface is made to slide over another, the motion
is resisted by friction between the surfaces. [friction is the force which
tends to oppose the motion of two objects in contact with extent depending on
the speed and the load. Example of this is the overheating and eventual seizure
of a dry metal bearing and the primitive method of producing fire by melting
two pieces of wood together.
can be reduced, motion facilitated, and overheating prevented by interposing a
fluid film between the two surfaces. The application of the fluid film on the
moving surface is known as BUBRICATION.
an engine consists of metal surfaces moving in relation to one another. No
matter how a metal surface is machined and how smooth it appears to be , it
presents an irregular pattern of aspenties and intervening troughs. When two
such surfaces come together the contact is not over the whole area but is only
where the aspen ties met and it is their interlocking that accounts for the frictional
resistance to motion. If sliding is enforced, friction is high owing to the
interlocking. Heat will also be generated enough to weld asperities together.
Hence, by applying a fluid film between the surface that are apart
providing the thickness of the film is greater than the height of the
asperities and the load is insufficient to disrupt the film. Resistance to
motion is than due solely to that offered by the fluid [that is lubricating
oil]. This resistance to the flow of fluid is known as VISCOSITY of the fluid.
Friction and wear are negligible.
During the combustion of fuel in the engine, some reactions occur if not
prevented. These reactions are oxidation of the oil which lead to formation of
oil insoluble matter, generation of elements present in the fuel which are
released during fuel combustion. Also high pressure produced by heavy loads can
have an effect in the engine. These reactions above also have some effects on
the engines, the acidic substance produce react with the metal surface thereby
causing wear and corrosion on these surfaces. The high pressure produced by
heavy loads also result in difficulty of the moving parts to move. This also
lead to friction.
Consequently, lubricating oils are needed in engines to:
1. minimize friction and wear.
2. to keep the engine parts licings, piston ring
groves oils ways and crank shapes] clean by preventing engines of contaminants.
3. to protect metal surfaces against corrosion
4. to cool the working parts of the engine by
transferring heat to water jackets and crankcase and
5. it acts as a sealing medium between cylinder
walls and piston rings.
1.4 TYPES OF LUBRICATION
Lubrication is the process of controlling friction and wear by the
introduction of a friction-reducing film between two moving surfaces in contact
with each other. It is of different types, namely
1. Hydrostatic lubrication
2. Hydrodynamic lubrication
3. Elastohydrodynamic lubrication
4. Boundary lubrication
This is the application of lubricating
oils on systems with high load under sufficient m pressure.
This is type
of lubrication which deals with the application of fluid film in between the
moving surfaces with the help of the design of the system to form a
wedge-shaped film in which sufficient pressure is generated to support the load.
This is the
application of high viscous fluid film [lubricating oil] on machines which
carry high loads.
The viscosity of the fluid helps in load bearing capcity.
This is the
type of lubrication characterized by the shearing action of the adsorbed layer
which is provided by the polar molecules which the lubricating oils contain.
The need for this type of lubrication arises when the system is operating at
high loads and the thickness of the oil may be so reduced that it is easily
ruptured. Hence contact between asperities occur.
1.5 DEFINITION OF AN ENGINE
An engine is a complex piece of machinery in which power is
applied to do work.
1.6 THE PURPOSE OF THIS WORK
The aim of this project is to select lubricating of the oils like
viscosity, flash point and specific gravity will guide us into the confirmation
of the specification which the engine manufacturers give concerning the
concerned engines. This project will be of much benefit to engine users
especially cdr engine owners. It will help them to find out the engine
manufacturers’ specification of their engines and then need to make use of it.
1.7 THE SCOPE OF THE PROJECT
The topic of this project is ‘selection of lubricating oils for
the performance of various engines. This project covers the selection of four
different engines of vehicles and their respective lubricating oils. The reason
for the selection are specified.
TERMS AND CONDITIONS APPLY
For more informations on project materials and more