Skip to main content

PORT TMING DIAGRAM FOR TWO STROKE CYCLE S.I ENGINE :

Two stroke cycle engines are provided with ports. The timing sequence of events like  opening and   closing of various ports are shown graphically in terms of crank angles from dead center positions. This diagram is known as port timing diagram. 

 The inlet port is opened by the piston 45* to 55* before TDC. The inlet port is closed by piston 45* to 55* after TDC position.

 The Exhaust port is opened by the piston 40* to 55* before BDC. The exhaust port is closed by the piston 40* to 55* after BDC position.

 The transfer port is opened by the piston 30* to 40* before BDC. The transfer port is closed by piston   30*  to 40* after BDC. Ignition occurs 15* to 20* before TDC.




 Port valve timing and Events during  Port timing 

 IPO - IPC   Air fuel Mixture is sucked into the crank case.

 IPC - TPO  Air fuel mixture is partially compressed in the crank case which is known as crank case   compression.

 TPO - TPC  Partially compressed air fuel mixture is transferred into the engine cylinder. 

 TPC - IG    Air fuel mixture is compressed in the cylinder. 

 IG              Air fuel mixture is ignited by the spark plug and burns. 

 IG - EPO   The burning Gases expand for doing work on the piston.

 EPO - EPC  Burnt gases are pushed out of the engine cylinder. 


Labels:

Comments

Post a Comment

Popular posts from this blog

ELECTRICAL COMPARATORS AND ITS WORKING

Electrical Comparators are used as a means of  detecting and amplifying small movements of a work contacting elements. An electrical comparator consists essentially of  a pick-up head or transducer for converting a displacement into a corresponding change in current and a meter or recorder connected in the circuit to indicate the electrical change, calibrated to show in terms of displacement. Generally, an amplifier is needed to provide the requisite sensitivity and to match the characteristics of different parts of  the circuit. Electrical comparators can be classified according to the electrical principle used in the pick-up head. Most of the comparators use either a differential transformer, an inductance bridge, a strain gauge or a capacitor as a means of detecting movement of the gauging element. There are different types of  electrical comparators. One kind called an electrolimit gauge is used to check or measure the outside diameter of a  roll. The objec...
1 comment
Read more

SIMPLE CARBURETOR - CONSTRUCTION AND WORKING

CONSTRUCTION OF SIMPLE CARBURETOR :  The main Components of Simple Carburetor are : Float Chamber, float, nozzle, venturi, throttle valve, inlet valve, and metering jet . In the float chamber, a constant level of petrol is maintained by the float and a needle valve.  The float chamber is ventilated to atmosphere.  This is used to maintain atmospheric pressure inside the chamber. The float which is normally a metallic hollow cylinder rises and closes the inlet valve as the fuel level in the float chamber increases to certain level. The mixing chamber contains venturi, nozzle and throttle valve. The venturi tube is fitted with the inlet  manifold. This tube has a narrow opening called venturi. A nozzle is provided just below the centre of this venturi. The nozzle keeps the same level of petrol as that of the level in the float chamber. The mixing chamber has two butterfly valves.  One is to allow air into the mixing chamber known as choke valve. The other is to al...
Post a Comment
Read more

TOP POLLUTION RECORDED IN WORLD

CHERNOBYL NUCLEAR DISASTER (NUCLEAR POLLUTION) :  In April 26,1986, the melt down of the Chernobyl nuclear reactor , in Russia, has leaked out the radioactive rays and radioactive materials.   Effects : 1. In this Pollution nearly 2000 persons have been killed by the accident. 2. People suffered due to the illness such as, degeneration of the cells, severe bleeding, anemia, skin cancer. 3. Animals, Plants are also affected by nuclear radiation.  MINAMATA EPIDEMIC (1953) : MARINE POLLUTION ( CASE STUDY ) Minamata is a small coastal village in Japan. The Chisso Chemical Company , which produces vinyl polymer plastics used organomercurial compound. The industry released its effluent into Minamata sea. The effluent containing mercury ions is converted into methyl mercury, which is highly toxic.  The marine organisms like phytoplankton and zoo-planktons easily absorb the toxic methyl mercury compound. These organisms are consumed by small fishes and these are in ...
Post a Comment
Read more