What does CI stand for in engines?

Near TDC of the compression stroke, fuel is injected directly into the cylinder using a high-pressure fuel injector.

What is SI engine and CI engine?

Si engine is internal combustion engine that operates on the principle of spark ignition. It uses petrol and utilizes the Otto cycle. The diesel (Ci) engine is also an internal combustion engine, which uses diesel fuel and operates on diesel cycle.

Which is better SI engine or CI engine?

6… Thermal efficiency: Due to lower compression ratio, maximum value of thermal efficiency is lower in an S.I engine compared to that of C.I. 7… Weight : S.I engines are generally lighter in weight due to their lower peak pressures as compare to C.I engines that are generally heavier, due to higher peak pressure.

Why diesel engines are called as CI engines?

Diesel engines are sometimes called compression-ignition engines because initiation of combustion relies on air heated by compression rather than on an electric spark.

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What is meant by SI engine?

A spark-ignition engine (SI engine) is an internal combustion engine, generally a petrol engine, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug.

Which is better Si or CI?

The high temperatures achieved in CI engines cause the fuel to ignite. SI engines are high speed while CI engines are low speed. SI engines have a lower thermal efficiency than CI engines.

How do I know if my engine is CI or SI?

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.

Does CI engine has spark plug?

Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. Technically petrol engines are called as spark ignition engines ( SI ) and diesel engines are called as compression ignition engines (CI ) .

Which engine has more thermal efficiency?

According to Popular Mechanics, the reason diesel engines have a higher thermal efficiency than gasoline engines is that of two factors: compression ratios and lean-burn combustion.

Why do diesel engines not need spark plugs?

The higher the ratio, the more air is compressed, and more of the injected fuel is ignited during combustion. The result is a more powerful explosion and better performance. While compression ignition means that diesels don’t require spark plugs, they can come fitted with components called glow plugs.

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How do you classify IC engines?

There are several possible ways to classify internal combustion engines.

  1. Reciprocating. By number of strokes: …
  2. Rotary. For rotating-crankcase radial-cylindered engines, see Rotary engine. …
  3. Continuous combustion. Gas turbine engine. …
  4. Structure. …
  5. 4-stroke engines. …
  6. 2-stroke engines. …
  7. Ignition. …
  8. Lubrication.

Why are CI engines more efficient?

CI engines bring higher Fuel Conversion Efficiency

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.

Which engine has carburetor?

In petrol engine combustion takes place when a mixture of air and fuel gets spark from spark plug (spark initiates fuel burning). This mixture of air and fuel is carburetor. Hence a petrol engine is also known as spark ignition engine, since a spark is used to burn a mixture of air and petrol (or gasoline).

What is knocking in IC engine?

knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. … Knocking can cause overheating of the spark-plug points, erosion of the combustion chamber surface, and rough, inefficient operation.

What is turbulence in IC engine?

The induction of air or an air/fuel mixture into the engine cylinder leads to a complex fluid motion. There can be an ordered air motion such as swirl, but always present is turbulence.

What are the 3 types of ignition systems?

There are three basic types of automotive ignition systems: distributor-based, distributor-less, and coil-on-plug (COP). Early ignition systems used fully mechanical distributors to deliver the spark at the right time.

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