What are the properties of engine oil?
The main requirements for an engine oil are defined temperature-viscosity properties, protection against wear and corrosion, keeping the engine clean, holding particles like soot or abrasives in suspension, yield strength under compression and many more. Temperature impacts the flow properties of engine oil.
What is the most important property of engine oil?
Considered the most important property of a lubricant, viscosity serves to form a lubricating film, cool machine components, and seal and control oil consumption.
What are the important properties of good lubricating oil?
A good lubricant generally possesses the following characteristics:
- A high boiling point and low freezing point (in order to stay liquid within a wide range of temperature)
- A high viscosity index.
- Thermal stability.
- Hydraulic stability.
- Corrosion prevention.
- A high resistance to oxidation.
Which oil is used in IC engine?
Mineral oil is the most commonly employed liquid lubricant and is used in general purpose machineries and engines. It is obtained after refining petroleum oil. In case of sliding surface such as piston/cylinder the lubricating oil is scraped off by the motion of the oil control ring.
What are the 3 important functions of the lubrication oil?
Lubrication – Provide a film between moving parts. Cooling – Heat transfer media. Cleaning – Holding contaminants in suspension.
Which is the most important property of lubricants *?
Viscosity is the most important physical property of a lubricant. How the viscosity of a fluid reacts to changes in temperature, pressure or speed determines how well a fluid can perform the basic functions of a lubricant.
What are the 7 functions of engine oil?
The seven primary functions of motor oil
- Minimize friction and reduce wear. The most common and essential function of motor oil is to minimize friction and wear between components.
- Cool engine parts.
- Form a seal.
- Dampen shock.
- Prevent corrosion.
- Transfer energy.
What are the 5 main functions of lubricating oil?
Oil. Its basic functions within an engine include reducing friction, cooling, sealing, cleaning, and serving as protection for moving parts. But it’s often taken for granted. This article will look at the basics of lubrication and the various types and characteristics of oil.
What are the basic required properties of lubricants and coolants?
Lubricants must have the following main characteristics
- Keep surfaces separate under all loads, temperatures and speeds, thus minimizing friction and wear.
- Act as a cooling fluid removing the heat produced by friction or from external sources.
Why lubricants are used in IC engine?
Lubrication is the action of applying a substance such as oil or grease to an engine or component so as to minimize friction and allow smooth movement. Lubricating system is a mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings.
What are the 6 purposes of engine oil?
What are 3 main purposes of engine oil?
What are the four major functions of oil?
4 functions of oils in gas engines
- Control of oxidation and nitration. The higher temperatures experienced by gas engines promote the formation of nitrous oxides.
- Reduction of the friction and wear.
- Prevention of corrosion and oxidation.
- Cleaning the engine.
What are the types of lubricants and their properties?
Here given are the common lubricants and their uses:
- Greases. Greases are composed by utilizing oil (typically mineral oil) and combining it with thickeners (such as lithium-based soaps).
- Oils. These thin liquids are composed of long polymer chains with some extra additives.
- Penetrating Lubricants.
- Dry Lubricants.
What is the importance of engine oil?
The main role of engine oil is to lubricate the engine parts, which are constantly in friction. It thus reduces friction which tends to increase part wear. The energy lost through combustion and the friction between mechanical parts causes the engine temperature to rise.
Why the determination of viscosity is important for the fuel and lubricating oils used in IC engines?
Viscosity, or the thickness of the oil, is important because it determines the lubricant’s film strength and efficiency in preventing friction between moving parts. Thick oil has a high viscosity, and thin oil has a low viscosity.
What are the lubricants used for engine?
The lubricants used in engines consist of mixtures of base lubricating oils, which are distinguished by their viscosities, and performance additives. The base lubricating oils can be petroleum based (mineral oils), synthetically produced, or natural plant oils.
What are the advantages of lubrication in IC engine?
It reduces wear and tear of the moving parts. It minimizes power loss due to friction. through crankcase. It provides cushion effect:- It serves as a cushion against the shocks of the engine.
What are the characteristics of fuels for internal combustion IC engines?
|Density (1 atm, 20°C (kg/m3))||1.092||720–780|
|Auto ignition temperature (°C)||305||257|
|Stoichiometric ratio (kg/kg)||13.2||14.7|
|Motor octane number||45–50||95–97|
What are the 5 components of motor oil?
The composition of engine oil
- 78% base oil.
- 10% viscosity improvement additive (to improve flow)
- 3% detergent (detergent substances which clean the engine)
- 5% dispersant (for the suspension of dirt particles)
- 1% wear protection.
- 3% other components.