Advantages And Disadvantages Of Two Stroke Cycle Engine.
Posted Date: 16-Dec-2008
Many of us uses motor bike or car for travelling purpose.How much you know about the engine and how it works? I bet,most people don't know anything
about this.Those who are in mechanical field,must be familiar about working principle of two stroke or four cycle engine but common person don't.That is
why I am giving here,the advantages and disadvantages of two stroke cycle engine over four stroke cycle engine.
First we will see the advantages.
01)Two stroke cycle engine is more compact,requires less space and lighter in weight than four stroke cycle engine for same output or power.Power
developed per kilogram of engine weight is higher in two stroke cycle engine.That's why it is more suitable for motor bike and scooters.
02)The two stroke cycle engine gives one working stroke for each revolution of crankshaft.Hence theoretically the power developed for the same engine
speed and cylinder volume is twice is that of four stroke cycle engine which gives one working stroke for every two revolution of the crankshaft.
03)We can use lighter flywheel in two stroke cycle engine as their is one working stroke for each revolution of crankshaft.
04)The design and construction is much simpler than four stroke engine that's why it is easy to manufacture and cost effective.
05)As there is no suctionand exhaust valve used in two stroke cycle engine hence no need of cams,camshaft and rockers etc. of the valve gear.Resulting in
higher mechanical efficiency.
06)Due two suction and exhaust ports only,there is work saved avoiding friction.
07)Two stroke cycle engine gives less torsional oscillations.
08)This type of engine requires less spare parts.
09)A two stroke cycle engine can be easily reversed if it is of valveless type.
10)Due to simplicity in construction and fewer parts,two stroke cycle engine is easy for maintenance.Hence reduce the initial and maintenance cost also.
From above description you may prefer two stroke engine,but wait,there are some disadvantages also.They are as below.
01)The fuel consumption is higher in case of two stroke engine working on Otto cycle.This happens due to some of the fuel or unburnt gas likely to be
wasted by escaping through the exhaust port.
02)Since the ports remains open during up word stroke,the actual compression starts only after both inlet and exhaust ports have been closed.So actual
compression ratio and the thermal efficiency of the two stroke cycle engine is less than that of four stroke engine of thesame dimension.
03)The dilution of charges takes place due to incomplete scavenging.
04)Two stroke engine consumes more lubricating oil.
05)There is greater wear and tear of moving parts hence it gives loud noise.
So,choice is yours,you know the advantages and disadvantages of two stroke cycle engine.
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N K Ravishankara
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