All CI engines use fuel injection, usually direct injection but some engines instead use indirect injection. SI engines can use a carburetor or fuel injection as port injection or direct injection. Most SI engines have a single spark plug per cylinder but some have 2.
Which one of the following is used in CI engine?
Platinum and palladium are two main catalyst materials used for converters on CI engines. Explanation: Platinum and palladium are only the two main catalyst materials that are used for converters on CI engines.
Which is not used in CI engine?
Explanation: Alcohols have high self-ignition temperature and low latent heat of vaporization. That is why they cannot be used in CI engines. … Explanation: Methanol is not used in CI engines because of its high octane number and low cetane number.
Why Diesel is used in CI engine?
Load is controlled in a CI engine by the amount of fuel injected limited by the amount of charge gas oxygen. CI diesel engines combust fuel in a locally stoichiometric rich zone, but globally lean (excess air), which provides efficiency improvements. Compression ignition engines are typically fueled with diesel fuel.
What are the main components of IC engine?
Basic Components of IC Engine and Their Function
- Cylinder block. BMW 6-cylinder block. …
- Cylinder. Cylinder is a space or cylindrical vessel supported by the cylinder block, in which the piston makes reciprocating motion. …
- Piston. Piston is a tubular component that fitted into engine cylinder. …
- Piston rings. …
- Combustion chamber. …
- Connecting rods. …
- Crankshaft. …
- Spark plug.
How does a CI engine work?
Diesel engines work by compressing only the air. This increases the air temperature inside the cylinder to such a high degree that atomised diesel fuel injected into the combustion chamber ignites spontaneously. … They were originally used as a more efficient replacement for stationary steam engines.
What is the difference between SI & CI engine?
The Spark Ignition (SI) engine, as its name indicates uses spark to ignite the fuel. … And in Compression Ignition (CI) engine, the air is compressed within the cylinder and the heat of this compression air is used to ignite the fuel.
Is fuel pump used in CI engine?
CI Engine Fuel Supply System
The high-pressure pump is the main and the most complicated component of the fuel system. … Both coarse filters and fine filters are used for filtration of the fuel oil. The fuel feed pump transfers fuel from the tank to the high-pressure pump (injection pump).
What is 4 stroke CI engine?
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. … Combustion: Also known as power or ignition.
Why are CI engines more efficient?
CI engines operate with a relatively low proportion of fuel to air ratio (what we call “lean”). The ratio of specific heats is higher, thereby resulting in a higher fuel conversion efficiency. Ultimately, we observe lower fuel consumption and lower emissions of carbon dioxide.
What is the disadvantage of diesel engine?
Cons of Diesel Engines
Diesel vehicles are more expensive. Some buyers may feel the fuel-efficiency and durability are not worth the extra cost. Engines are more technologically advanced, so service may cost more if you neglect proper maintenance. Diesel fuel is more expensive and can sometimes be harder to find.
What if petrol is used in diesel engine?
Putting petrol in a diesel car can cause serious damage to the fuel injection system and the engine. … Serious engine damage may also occur due to detonation caused by uncontrolled petrol ignition under the much higher compression ratio in diesel engines.
Why is 2 stroke diesel engine rarely used?
Why is two stroke diesel engine rarely used? … 2 stroke engines are rarely used because in this engine the problem of scavenging occurs. Scavenging is termed as incomplete combustion of fuel and air mixture i.e. some of the fuel doesn’t gets burnt out, it goes into the exhaust without getting in combustion.
What are the 3 main engine systems?
- Mechanical fuel injection systems.
- Operating systems.
- Piston rings.
- Primary system.
- Spark ignition systems.
- Spring retainers.
What is IC engine and types?
There are two kinds of internal combustion engines currently in production: the spark ignition gasoline engine and the compression ignition diesel engine. Most of these are four-stroke cycle engines, meaning four piston strokes are needed to complete a cycle.
What is the best engine block materials?
The material selected for the engine block is either gray cast iron or aluminum alloy. Both of these metals have good thermal conductivity and fluidity in the molten state.