Showing posts with label Petrol Engine. Show all posts
Showing posts with label Petrol Engine. Show all posts

Thursday, 12 March 2015

TWO STROKE PETROLENGINE

By Unknown / Posted on 08:35 / No comments / Categories:
                                                       TWO STROKE PETROLENGINE

 In the two stroke engine,ports(intake,exhaust&transfer ports)of different sizes and shapes are there in the cylinder wall at different levels and positions.The piston as it moves up&down in the cylinder  opens and closes these ports.Piston controlled port two stroke engine is used widely in two wheelers.
                                                                                                                                       In the piston controlled port two stroke engine,as the piston descends from TDC(power stroke)just before BDC,the piston crown opens the exhaust port.Expanding combustion products rush out.The downward movement of the piston compresses the mixture that has been previously sucked into the crankcase.Further downward movement of the piston,causes the piston crown to open the transfer ports.The transfer port and the transfer passages connect the cylinder with the crankcase.As such the mixture compressed to some extent and confined in the crankcase,now rushes through the transfer ports and fills the cylinder.The entering mixture sweeps the combustion products that may remain in the cylinder.After the piston reaching BDC,it begines to rise.Now the piston first closes the transfer ports and then the exhaust port.
                                                                                                               From the instant of the closure of the transfer ports,the upward movement of the piston creates partial vacuum in the crankcase.As the piston moves further upward,at some instant,the bottom of the piston opens the intake port.Now because of the vacuum in the crankcase,airfuel mixture is sucked into the crankcase.Then the airfuel mixture is passed through the transferport and it will compressed in the cylinder by the piston.it will ignites by the sparkplug.Its the simple working of a two stroke petrol engine.


Watch the working of twostroke petrol engine:-ClickHere

Friday, 6 March 2015

FOURSTROKE PETROL ENGINE

By Unknown / Posted on 07:39 / No comments / Categories:
                                                     FOURSTROKE PETROL ENGINE
The fourstroke engine is also called sometime as four cycle engine.The main components of the four stroke engine are piston assembly,connecting rod,cylinder,cylinder head,crank case,crank shaft,inlet and exhaust valves,valve operating mechanism and ignition system.The operation of the four stroke engine is illustrated.The four stroke petrol engine is works as herein.when the piston is moving upward and is close to TDC,the inlet valve is opened.As the piston move downward vacuum is created in the cylinder.Air fuel mixture is sucked in.The piston after reaching BDC begins to rise.At this point,the inlet valve is closed,and exhaust valve is already in the closed position.Now the piston moves upward,and compresses the charge temperature and pressure of the charge increase.
                                                                         At the end of the compression stroke,an electric spark is produced .This ignites the mixture,combustion take place.High pressure thus developed forces the piston to move downward.The piston is connected to the crank shaft by the connecting rod.As such the crankshaft is rotated .After the power stroke,piston rises up.Now the piston pushes the combustion products out of the cylinder.As the piston approaches close to TDC.Intake valve is opened.Fresh charge begins to enter the cylinder.The cycle of operations gets repeated again & again and the engine continues to work.

Monday, 23 February 2015

ENGINES

By Unknown / Posted on 08:30 / No comments / Categories: ,
                  ENGINES

It is the heart portion of a vehicle,in other words driving portion.It’s an assembled form of many other parts like oilsump,cylinder,piston,valves etc.When the engine starts a fly wheel(a wheel of high mass)begin to rotate,it will rotates in high speed crank and it’s connected to the crankshaft which drives the piston,the piston is placed in a cylinder.The other end of crankshaft is joined to timing gear or pulley.This portion controls the valve timing.Then a shaft called camshaft driven by this timing gear,it controls the opening and closing of the inlet and outlet valve.This drive is given by a special part called tappet and push rod.The returning force to the valve is given by a spring.Its the simple working of a  engine,there are many other operations like cooling and lubricating.There is an additional oil sump is used to store the oil and to distribute it.When all these processes works properly then its called an engine.

Parts of an Engine:
1-Fly wheel
2-Crankshaft
3-Timing gear or pulley
4-Cam shaft
5-Tappet & push rod
6-Piston
7-Cylinder
8-Oil sump
9-Cooling system
10-Valve mechanism

Classifications
According to strokes:
                   Fourstroke engine
                   Twostroke engine
According to position of cylinder:
                   Vertical engine
                   Horizontal engine
                   Inclined engine
According to fuel used:
                   Petrol engine
                   Gas engine
                   Diesel engine
According to the combustion take place:
                   Internal combustion engine(IC)
                   External combustion engines(EC)

For video-Watch

Sunday, 27 July 2014

IC ENGINES & EC ENGINES

By Unknown / Posted on 09:21 / No comments / Categories: ,
IC ENGINES & EC ENGINES:
                       IC engines and EC engines are one of the main classifications of engines.This classification is based on the combustion take place.If the combustion take place inside of the engine that's IC engine and the combustion take place outside of the engine it's EC engine.

INTERNAL COMBUSTION ENGINES:
                      They are more compact in size,because the combustion is inside the engine cylinder.These types of engines are commonly used in the automobile industry.Because it is lighter in weight and smaller and size.There is no need of another boiler or something,it  is the main particle of it.The combustion means to produce a gas or steam, this steam will force the piston.In IC engines this steam or gas is produced by the help of spark plug(in petrol engine) or the help of fuel injector(in diesel engine).This technology can provide more compact construction for an engine.So the IC engines are widely used.There is no need of an extra boiler for the combustion,the combustion take place in the engine cylinder.
ADVANTAGES:
              >It is more compact in construction
              >It can provide more efficiency
              >High speed engine
              >Fuel efficiency is high

EXTERNAL COMBUSTION ENGINES:
                     They are comparatively large in size and there is a need of external boiler,so it is named external combustion engine.The gas or steam produced by the boiler will passed through a pipe or tunnels.The old types of trains are the best example for it.So they are large in size.So they are commonly used in factories or machinaries.They need high maintanance and needs more care.They can provide more power to the engine.because the boilers are huge in size.


ADVANTAGES:
             >It can provide more power
           









IC engine working-Watch
EC engine working- watch

Friday, 25 July 2014

PETROL ENGINE

By Unknown / Posted on 23:07 / No comments / Categories:
PETROL ENGINES:
PETROL ENGINE
               Petrolengines are the most commonly using engine in the world,because petrol engines are most efficient and it has noiceless working.Petrol engines also has a cylinder and a piston.A carburator is must for this petrol engines.Carburator is used to mix air with petrol.The air and petrol mixture is used as the fuel in petrol engine.In the top of the cylinder there is a inlet and outlet valve,the air petrol mixture will enter into the cylinder through the inlet valve.Through the compression stroke the mixture will compressed by the piston,and it will burned by sparkplug.The sparkplug is the important particle in the petrol engine,it is used to make electricspark in the engine cylinder.This electric arc is produced by a external battery or something.After the ignition stroke the burned fuel will goes out through the outletvalve in exhaust stroke.The vehicles using petrol engines has higher efficiency and milage.So the petrolengines are widely used.

ADVANTAGES:
          >It is more efficient
          >It has noiceless working
          >More compact in construction
          >Fuel efficiency is high

Petrolengine working watch


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