β³οΈ Internal Combustion Engine Terminology & Abreviations β¬οΈβ¬οΈ
π΅πBest Mechanical Engineering informationβ Android App Download fast https://play.google.com/store/apps/details?id=com.mechanical.notes
β¬οΈβ¬οΈβ¬οΈβ¬οΈβ¬οΈβ¬οΈ
ππ Join telegram channelππππ
https://t.me/engineeringupdate
πΈοΈIC β Internal Combustion
πΈοΈSI β Spark Ignition
An engine in which the combustion process in each cycle is started by use of a spark plug.
πΈοΈCI β Compression Ignition
An engine in which the combustion process starts when the air-fuel mixture self ignites due to high temperature in the combustion chamber caused by high compression. CI engines are often called Diesel engines, especially in the non-technical community.
πΈοΈTDC β Top-Dead-Center
Top Dead Center (TDC), When the piston farthest from the crankshaft (for vertical engine). In a horizontal engine, it is called inner dead canter (IDC).
πΈοΈBDC β Bottom Dead Centre
Bottom Dead Center (BDC), When the piston is nearest to the crankshaft. In a horizontal engine, it is equivalent to outer dead center (ODC).
πΈοΈStroke β Movement distance of the piston from one extreme position to the other:
(TDC to BDC) or (BDC to TDC) .
πΈοΈBore β Diameter of the cylinder.
πΈοΈMaximum or total volume of cylinder βV_total
It is the volume of cylinder when the piston is at bottom dead center(BDC). Generally, it is measure in centimeter cube (c.c.).
πΈοΈMinimum or clearance volume of cylinder β(Vclearance)
It is the volume of cylinder when the piston is at top dead center(TDC).
πΈοΈCR β Compression Ratio
The compression ratio (CR) of an engine is a measure of how much the air/air-fuel mixture is
compressed in the cylinder. It's the ratio of maximum volume to minimum volume of cylinder.
It is 8 to 12 for spark ignition engine and 12 to 24 for compression ignition engine.
βΆοΈCompression ratio = Total volume / Clearance volume
πΈοΈCombustion Chamber β
The end of the cylinder between the head and the piston face where combustion occurs.
The size of the combustion chamber continuously changes from a minimum volume when the piston is at TDC to a maximum when the piston is at BDC.
πΈοΈDisplacement volume or Swept volume (Vs)
β It is the volume swept by the piston when moving from one dead centre to the other dead centre. Swept volume usually expressed in cubic centimetre (cc).
β‘οΈ Vs = (Ο/4) * (Bore)^2 * (Stroke)
Or β‘οΈ Vs = Total Volume - Clearance Volume
πΈοΈCC β Cubic Centimeters (cmΒ³)
The term βccβ stands for Cubic Centimeters or simply cmΒ³ which is a metric unit to measure the Engine's Capacity or its volume.
πΈοΈEngine Capacity β
Engine capacity refers to the volume swept by all the pistons of an engine, within their bores, from the top to the bottom of their travel. Measured in litres, cubic centimetres (cc)
βοΈ Engines with greater capacities are usually more powerful and provide greater torque at lower rpms but also consume more fuel.
β‘οΈ Engine capacity = Swept volume Γ Number of cylinder
πΈοΈHP β Horsepower
In essence, HP, BHP, PS, CV and kW all refer to the amount of power that an engine produces. Or, in less technical terms, how much βworkβ it can do. As a rule of thumb, the higher the horsepower, the faster a car can ultimately go. Power is important measure of engine performance.
πΈοΈTorque β
Like power, torque is another important measure of engine performance. Torque is a rotating force produced by an engineβs crankshaft. The more torque an engine produces, the greater its ability to perform work.
πΈοΈMBT β Maximum Brake Torque
Maximum Brake Torque (MBT) is the use of optimal ignition timing to take advantage of an internal combustion engines maximum power and efficiency.
There is always an optimal spark timing for all operating conditions of an engine. MBT is most ideal at wide-open throttle (WOT), but not desirable when the engine is at idle. Although MBT is desired at WOT, it is wise to retard timing slightly to prevent knocking that may occur and to create a small safety margin.
π΅πBest Mechanical Engineering informationβ Android App Download fast https://play.google.com/store/apps/details?id=com.mechanical.notes
β¬οΈβ¬οΈβ¬οΈβ¬οΈβ¬οΈβ¬οΈ
ππ Join telegram channelππππ
https://t.me/engineeringupdate
πΈοΈIC β Internal Combustion
πΈοΈSI β Spark Ignition
An engine in which the combustion process in each cycle is started by use of a spark plug.
πΈοΈCI β Compression Ignition
An engine in which the combustion process starts when the air-fuel mixture self ignites due to high temperature in the combustion chamber caused by high compression. CI engines are often called Diesel engines, especially in the non-technical community.
πΈοΈTDC β Top-Dead-Center
Top Dead Center (TDC), When the piston farthest from the crankshaft (for vertical engine). In a horizontal engine, it is called inner dead canter (IDC).
πΈοΈBDC β Bottom Dead Centre
Bottom Dead Center (BDC), When the piston is nearest to the crankshaft. In a horizontal engine, it is equivalent to outer dead center (ODC).
πΈοΈStroke β Movement distance of the piston from one extreme position to the other:
(TDC to BDC) or (BDC to TDC) .
πΈοΈBore β Diameter of the cylinder.
πΈοΈMaximum or total volume of cylinder βV_total
It is the volume of cylinder when the piston is at bottom dead center(BDC). Generally, it is measure in centimeter cube (c.c.).
πΈοΈMinimum or clearance volume of cylinder β(Vclearance)
It is the volume of cylinder when the piston is at top dead center(TDC).
πΈοΈCR β Compression Ratio
The compression ratio (CR) of an engine is a measure of how much the air/air-fuel mixture is
compressed in the cylinder. It's the ratio of maximum volume to minimum volume of cylinder.
It is 8 to 12 for spark ignition engine and 12 to 24 for compression ignition engine.
βΆοΈCompression ratio = Total volume / Clearance volume
πΈοΈCombustion Chamber β
The end of the cylinder between the head and the piston face where combustion occurs.
The size of the combustion chamber continuously changes from a minimum volume when the piston is at TDC to a maximum when the piston is at BDC.
πΈοΈDisplacement volume or Swept volume (Vs)
β It is the volume swept by the piston when moving from one dead centre to the other dead centre. Swept volume usually expressed in cubic centimetre (cc).
β‘οΈ Vs = (Ο/4) * (Bore)^2 * (Stroke)
Or β‘οΈ Vs = Total Volume - Clearance Volume
πΈοΈCC β Cubic Centimeters (cmΒ³)
The term βccβ stands for Cubic Centimeters or simply cmΒ³ which is a metric unit to measure the Engine's Capacity or its volume.
πΈοΈEngine Capacity β
Engine capacity refers to the volume swept by all the pistons of an engine, within their bores, from the top to the bottom of their travel. Measured in litres, cubic centimetres (cc)
βοΈ Engines with greater capacities are usually more powerful and provide greater torque at lower rpms but also consume more fuel.
β‘οΈ Engine capacity = Swept volume Γ Number of cylinder
πΈοΈHP β Horsepower
In essence, HP, BHP, PS, CV and kW all refer to the amount of power that an engine produces. Or, in less technical terms, how much βworkβ it can do. As a rule of thumb, the higher the horsepower, the faster a car can ultimately go. Power is important measure of engine performance.
πΈοΈTorque β
Like power, torque is another important measure of engine performance. Torque is a rotating force produced by an engineβs crankshaft. The more torque an engine produces, the greater its ability to perform work.
πΈοΈMBT β Maximum Brake Torque
Maximum Brake Torque (MBT) is the use of optimal ignition timing to take advantage of an internal combustion engines maximum power and efficiency.
There is always an optimal spark timing for all operating conditions of an engine. MBT is most ideal at wide-open throttle (WOT), but not desirable when the engine is at idle. Although MBT is desired at WOT, it is wise to retard timing slightly to prevent knocking that may occur and to create a small safety margin.