What is the working cycle of SI engine?

The cycle includes four distinct processes: intake, compression, combustion and power stroke, and exhaust. Spark ignition gasoline and compression ignition diesel engines differ in how they supply and ignite the fuel.

What are the operating cycles for SI and CI engines?

The rest of the working of Diesel Engine is same as that of Petrol or Gasoline Engine. Here also one complete cycle is comprised of all the processes of Diesel cycle along with suction of fresh air and exhaust of burnt gases.


SI Engine CI Engine
It works on OTTO cycle. It works on Diesel or Dual combustion cycle.

What type of fuel is used for S.I engine?

In recent times, ethanol has been commonly used as a fuel additive or an alternative fuel in spark ignition (SI) engines and compression-ignition (diesel) engines. The use of ethanol, particularly in SI engines, has become attractive due to its relatively high octane number and the fact that it burns clean [4,5].

Which is better Si or CI engine?

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.

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What is the function of spark plug in SI engine?

As ignition temperature of fuel used in S.I engine is high thats why it require spark plug to ignite the fuel to take power stroke. To ignite the (air+ fuel mixture) in petrol engines. Spark plug is used to start the ignition in cylinder through applying small amount of spark for better combustion.

Explanation: Carburetor is not related to compression ignition engine. … Explanation: The purpose of carburetion is to break up and mix the petrol with air.

Which cycle is mostly used in high compression engines?

Dual cycle or limited pressure cycle is thermodynamic cycle for high speed diesel and hot spot ignition engine. Whether heat is added at constant pressure or constant volume in actual applications, depends upon the rate of heat added and the rate at which pressure decreases due to movement of the piston.

Why is the heat engine not 100% efficient?

A heat engine is considered to be 100% efficient if only all the heat is converted into useful work or mechanical energy. Since heat engines cannot convert all the heat energy into mechanical energy, their efficiency can never be 100%.

Which cycle is more efficient?

Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.

Is a Carnot cycle reversible?

The reversible Carnot cycle provides an upper limit for the heat engine. In the Carnot cycle, the greatest possible share of the heat produced by combustion is converted into work. The Carnot process consists of two isothermal and two isentropic steps.

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