WITH EFFECT FROM THE ACADEMIC YEAR 2010 - 2011

AE 253

AUTOMOTIVE PETROL ENGINES

Instruction       4 Periods per week

Duration of University Examination  3 Hours

University Examination          75 Marks

Sessional         25 Marks

UNIT -I          ENGINE CONSTRUCTION AND OPERATION                                 

Constructional details of four stroke petrol engine, working principle, air standard Otto cycle, actual indicator diagram, two stroke engine construction and operation, comparison of four stroke and two stroke engine operation, firing order and its significance. Port Timing, Valve Timing of petrol engines.

UNIT -II         SI ENGINE FUEL SYSTEM                                                                     

Carburettor working principle, requirements of an automotive carburettor, starting, idling, acceleration and normal circuits of carburettors. Compensation, maximum power devices, constant choke and constant vacuum carburettors, fuel feed systems; mechanical and electrical fuel feed pumps.  Petrol injection, MPFI.

UNIT -III       IGNITION SYSTEM                                                                                  

Types and working of battery coil and magneto ignition systems, relative merits and demerits, centrifugal and vacuum advance mechanisms. Types and construction of spark plugs, electronic ignition systems.

UNIT -IV       COMBUSTION AND COMBUSTION CHAMBERS                            

Combustion in SI engine: stages of combustion, flame propagation, rate of pressure rise, abnormal combustion, detonation, effect of engine variables on knock, knock rating. Combustion chambers: different types, factors controlling combustion chamber design.

UNIT -V         COOLING AND LUBRICATION SYSTEM                                          

Need for cooling system, Types of cooling system: air cooling system, liquid cooling system, forced circulation system, pressure cooling system. Lubrication system; mist, wet sump lubrication system. Properties of lubricants.

Suggested Reading

1. 1.Ganesan.V., “Internal Combustion Engines”, Tata McGraw-Hill Publishing Co., New Delhi, 2003.
2. 2.M.L.Mathur and R.P.Sharma, “A course in Internal combustion engines”, Dhanpat Rai & Sons Publications, New Delhi, 2001.
3. 3.K.K.Ramalingam, “Internal Combustion Engines”, Scitech Publications, Chennai, 2000.
4. 4.Heldt P.M., “High Speed Combustion Engines”, Oxford IBH Publishing Co., Calcutta, 1975.
5. 5.Pulkrabek “Engineering Fundamentals of the Internal Combustion Engines”, Practice Hall of India,