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