Why CI engines are heavier?

Now, in an internal combustion engine the compression ratio is directly related to the amount of power created; therefore in similar sized engines, the diesel is creating much more power than the gas engine. Consequently, the diesel engine is heavier than a similarly sized gasoline engine.

Which engine is heavier CI or SI?

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.

What is the difference between SI engine and CI engine?

Difference Between 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.

Why CI engine is more efficient than SI engine?

CI engines have higher Thermodynamic Efficiency With a higher compression ratio in CI engines as compared to SI engines, CI engines have a higher thermodynamic efficiency since more work is done with each expansion stroke.

Which engine gives you more power?

Effective RPM: Petrol engines provide power on more of the RPM band while diesel engines provide most of their power on the lower range of the RPM band. Fuel Efficiency: Due to the higher RPM band, petrol engines are less fuel efficient than their diesel engine counterparts.

Is fuel pump used in CI engine?

Early CI engines used air pressure to deliver the fuel into the cylinder, but nowadays liquid fuel, supplied by a reciprocating plunger pump, is delivered through small bore steel pipelines to the injector, which breaks up the fuel to the required degree and deliver it to combustion region in the chamber.

What is the difference between a CI engine and an SI engine?

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. Since spark and compressed air is used to ignite the fuel in these engines, so they are called as spark ignition (SI) engine and compression ignition (CI) engine.

Which is heavier a diesel engine or a Si engine?

The diesel engine is also heavier, and is most commonly installed in high power vehicles – trucks, buses, locomotives etc. The Si engine is an internal combustion engine of fuel and air that is ignited with spark plugs, designed to work on gasoline and similar petroleum products.

What is the compression ratio of a CI engine?

In CI engines, the compression ratio for air is 16 to 20. The high compression ratio of air creates high temperatures, which ensures the diesel fuel can self-ignite. 5) Weight of the engines: In CI engines the compression ratio is higher, which produces high pressures inside the engine.

Which is better for thermal efficiency CI or Si?

Thermal efficiency of the engine: In the case of CI engines the value of compression ratio is higher; hence these engines have the potential to achieve higher thermal efficiency. In the case of SI engines the lower compression ratio reduces their potential to achieve higher thermal efficiency.