19-07-2014, 10:45 AM
PERFORMANCE ANALYSIS OF SUPERCHARGING OF TWO
WHEELERS
ANALYSIS OF PULSE BURSTING.docx (Size: 1.29 MB / Downloads: 20)
ABSTRACT
The objective of this work is to increase the torque and power of the two wheeler by
supercharging the vehicle. For this purpose LML freedom 125 cc is analysed for the work
and certain parameters like torque, power, and specific fuel consumption vs rpm are
calculated. The data calculated is used in software Engine Analyser for analysis purpose
together with the data of supercharger. It can be seen that power and torque of the engine
increases from 7 to 11 KW and 9 to 13 NM at 7500 and 9000 RPM respectively.
I. INTRODUCTION
A supercharger is essentially a large pump that compresses air and forces it into
the engine’s air intake. Turbochargers do the same thing, only they are run by exiting
exhaust gasses, while superchargers are powered by the engine’s spinning crankshaft,
normally via the accessory belt. Supercharging an engine often results in huge power
increases in the range of 50% to 100%, making them great for racing, cross country
flying, or just having fun. And because of the way superchargers work, they provide
power only when the engine is under full throttle or under load not under normal cruising
conditions. This means that the supercharger will not affect the engine’s reliability,
longevity, or fuel economy under normal conditions.
Most of the superchargers sold today are centrifugal-style superchargers, which
are internal-compression superchargers, meaning they create the boost (compress the air)
inside the supercharger head unit (blower) before discharging it into the engine’s air
intake. External compression superchargers (roots or screw-type superchargers) have
become less popular as centrifugal superchargers have evolved. Centrifugal
superchargers ( Aero Superchargers,Vortech and Paxton ) are more reliable, especially at
higher boost levels, and are capable of creating much more boost than external
compression superchargers, while creating a much cooler intake charge (which results in
an even denser intake charge). Boost is created at the point when the supercharger’s
internal impeller pushes enough air through the blower to overcome the vacuum force
naturally created by the engine’s air intake, so air is being forced, rather than pulled, into
International Journal of Mechanical Engineering
and Technology (IJMET), ISSN 0976 – 6340(Print)
ISSN 0976 – 6359(Online) Volume 2
Issue 2, May – July (2011), pp. 63-69
© IAEME, http://www.iaemeijmet.html
IJMET
© I A E M E International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN
0976 – 6359(Online) Volume 2, Issue 2, May- July (2011), © IAEME
64
the air intake. Boost is measured in Manifold Pressure, or MAP. More boost equates to a
more dense air charge into the engine’s combustion chamber, which allows the engine to
burn more air and fuel and create more horsepower.
Different researchers work on increasing the performance of the superchargers. But only
very few did research on the supercharging of two wheelers. As we knew that racing
bikes are equipped with superchargers. But commercial two wheelers do not come with
superchargers. So, in this work the author tries to increase the power and torque
characteristics of the 125 cc engine of the LML freedom equipped with centrifugal
compressor
CONCLUSIONS
It can be concluded that it is possible to install a supercharger in case of commercial two
wheelers which increases their power on an average about 152 % more than the original
engine. So, supercharging can be done on those engines where maximum power and
torque is desired on the verge of more fuel consumption. Fig.1 shows the power and
torque characteristics of the given engine and the modified engine. It can be seen the International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN
0976 – 6359(Online) Volume 2, Issue 2, May- July (2011), © IAEME