4 stroke engine
Post on 12-Sep-2014
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From Tapan Joshi with love...TRANSCRIPT
4 STROKE PETROL ENGINE
Enrollment no. Name 116120319018 Tapan T. Joshi 116120319019 Parth V. Limbachiya
116120319020 Kamlesh V. Barapatre
CYLINDER BLOCKThe cylinder
block is the foundation to which all other components are attached.
PISTON and RODCast PistonForged PistonBarrel SkirtSlipper Skirt
Two compression rings
One oil ring
CRANKSHAFTChanges
Recipro-cating motion to Rotating motion
PISTON CONFIGURATIONS
Inline 6Inline 4Opposed 4V-6V-8
OTHER ENGINE ID’SValve Train Type
FlatheadOverhead Valve (OHV)Overhead Cam (OHC) or (SOHC)Dual Overhead Cam (DOHC)
Engine DisplacementKnow conversion Factors From CI to CC CC to CI
DEFINITIONSTDC
Top Dead CenterPiston at top of
stroke.BDC
Bottom Dead Center
Piston at Bottom of stroke.
STROKETDC to BDCBDC to TDC180 degrees of
crankshaft rotationFOUR CYCLE
(Stroke)4 x 180 = 720
degrees to make one complete cycle.
FOUR STROKE CYCLEIntakeCompressionPowerExhaust
IGNITION Spark Ignition (SI)
Gasoline Engines use a precisely timed electric spark to start the combustion process.
Compression Ignition (CI) Diesel Engines use the heat produced from
compression to raise cylinder temperature above the flash point of diesel, and inject fuel directly into the cylinder.
CAMSHAFTSCamshafts turn at one
half crankshaft speed.Camshafts can be
driven with a gear, chain and sprocket, or toothed belt.
Camshafts have one lobe for each valve.
INTAKE STROKEIntake valve openExhaust valve closedpiston traveling down
from TDC to BDCAir is being force into
the cylinder by the difference between atmospheric and cylinder pressure
COMPRESSIONSTROKEBoth valves closedPiston traveling up
BDC to TDCCompressing the air-
fuel mixture
POWERSTROKEBoth valves closedSpark plug ignites
the air fuel mixturePiston is being
pushed down by the expanding gases from TDC to BDC
EXHAUSTSTROKE
Exhaust valve openIntake valve closedPiston traveling up
from BDC to TDC forcing the burnt exhaust gases from the cylinder
At TDC the engine has returned to its starting point.
This type of engine gives practically more efficiency than 2 stroke engine.
More volumetric efficiency.Used in bike,car,engines,idustries,etc..
It is internal combustion engine.Mostly gives 40 to 60% efficiency in a vehicles.
References:- A book by Atul Prakashan by :- C.M.Desai
A book S.Chand Prakashan by :- R.S.Khurmi www.engineerstudent.co.uk www.wikipedia.org www.virtuallab.com www.engineering.myindialist.com www.google.com