Honest Auto Tech

Hello This is Bhushan. I will try to give you AutoGyan (Automotive information)/Honest Automobile Reviews.


Sunday, February 17, 2019

What is Automobile Engine Cylinder Cubic Capactiy (CC)

Hello Everyone,

Welcome to the new article on Automobile Engine Cylinder Cubic Capacity.
Everyone gets confused what is CC of vehicle if engine is multi cylinder is every cylinder is of same capacity or what is the capacity of each cylinder.

What is clearance Volume and compression ratio ? 

The volume contained in cylinder above the piston from its top dead center (TDC) position is called clearance Volume, Vc and the volume swept by the piston corresponding to its stroke length is called stroke volume or swept volume, Vs. 
Bore and Stroke of Piston

Total Cylinder Volume =  Clearnance Volume + Swept Volume 

The ratio of cylinder volume to clearance volume is called Compression Ratio 
Therefore, compression ratio is, 

       r = (Stroke Volme + Clearnance Volume )
                             Clearance Volume 

What is Automobile Engine Capacity ?

The term “cc” stands for Cubic Centimeters or cm³ which is a unit to measure the Engine's Capacity or its volume. The unit of measuring the volume of a hollow cube having size 1cm X 1cm X 1cm. Engine Capacity is also known as ‘Engine Displacement’. It is the displacement of the piston in the cylinder from Top Dead Centre (TDC) to the Bottom Dead Centre (BDC) in engine cylinder to complete its one cycle. The Engine Capacity is also measured in Liters.
The Engine Capacity is the combined capacity for all cylinders of the engine added together. For example, if a three-cylinder engine has a capacity of 1200cc or 1.2L, that means all the three cylinders can together accommodate a maximum of 1200 cubic centimeters or 1.2L of the volume of air (or the air-fuel mixture) in them. If the engine has only one cylinder, then that lone cylinder will accommodate all of the 400cc or 0.4L of air inside it.

For eg.
  • If Engine has an capacity of 1200cc it means capacity of engine is 1.2 ltr. 
  • If Engine has an capacity of 400cc it means capacity of engine is 0.4 ltr.
The Engine cc plays important role in Performance it affects on the factors such as Power and Torque. Smaller the CC then lesser the Engine Capacity and greater the Efficiency.

 An engine with higher capacity intakes more air into the cylinder. As the volume of the air grows, the fuel system also proportionally increases the quantity of fuel to the engine. As the amount of the fuel for burning increases, it also increases the power output. Hence, in simple words, the power output of an engine is directly proportional to the engine capacity in the engine design.

Supplying more fuel to the engine increases its power and also its fuel consumption. As the volume of the cylinders increases, the power output also increases. But eventually, this reduces the mileage. Hence in that context, the mileage of the car is inversely proportional to the engine capacity in a conventional design. The manufacturers keep upgrading the petrol engines and strike a balance between power and mileage to achieve both performance and efficiency.

How Engine Volume (CC) is Calculated ?

To calculate the volume of an engine you can use the formula-

V = π/4 x (D)² x H x N

V = Volume 
D = Bore Diameter
H = Stroke Length
N = No. of Cylinders

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