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2 stroke petrol engine
1. SUB: INTERNAL COMBUSTION ENGINE
TOPIC: 2 stroke petrol engine
Shri S’ad Vidya Mandal Institute of
Technology
Prepared by: KADVA ZAKVAN
2. INTRODUCTION
In 1878, Dugald-clerk, a british engineer introduced a cyle which
could be completed in two stroke of piston rather than four
strokes as is the case with the four stroke cycle engines. the
engines using this cycle were called two stroke cycle engines.
In this engine suction and exhaust strokes are eliminated.
Here, instead of valves, ports are used. The exhaust gases are
driven out from cylinder by the fresh charge of fuel entering the
cylinder nearly at the end of the working stroke.
3. 2 Stoke Engines
Everything a 4 stroke engine
does in 2 revolutions a 2
stroke engine does in 1
revolution of the crankshaft.
How to identify 2 stroke
engine from outside:
• Exhaust port in center of
cylinder
• Small crankcase
4. 2 Stoke Engines part names
Combustion
chamber
Cylinder
Exhaust port
Intake port
Piston
Connecting
Rod
Crankshaft
Crankcase
Reed valve
Transfer port
Still uses a flywheel
(not shown)
5. WORKING OF 2 STROKE PETROL ENGINE:
FUEL INTAKE:
Piston moves BDC to TDC
Reed Valve Is sucked open
Air/Fuel/Oil mixture sucked
into crankcase
6. COMPRESSION STROKE
Piston moves TDC To BDC
Reed Valve sealing
Air/Fuel/Oil mixture is now
pressurized in crankcase
Air/Fuel/Oil mixture squirts into
cylinder because of crankcase
compression
7. COMBUSTION & EXHAUST STROKE
Air/Fuel/Oil mixture is
ignited in cylinder
Reed valve close
Every time the piston
reaches TDC, there is
another power stroke.
9. Advantages of 2 stroke petlrol engine:
Smaller/lighter
Cheaper
Less friction
No oil to change
Quicker acceleration
Operate at different angles
10. Disadvantages of 2 stroke petlrol engine:
The lack of a dedicated lubrication system means that the parts of a two-
stroke engine wear a lot faster.
Two-stroke engines do not use fuel efficiently, so you would get fewer
miles per gallon.
Two-stroke engines produce a lot of pollution -- so much, in fact, that it is
likely that you won't see them around too much longer.