29-05-2012, 04:23 PM
A new generation of two stroke engine
A new generation of two stroke engine.pdf (Size: 2.37 MB / Downloads: 213)
INTRODUCTION
Since the creation of the snowmobile in 1960 by JArmand
Bombardier in Quebec, Canada, this product
knew a quick popularity throughout the country and North
America. With an annual average snowmobile sale in
Canada of more than 57000 units on the last twelve
years, this winter sport as an important economic impact.
In Canada only, this sport generates $6 billion annually.
This situation is proportionally the same in the province
of Quebec. Each year, about 800000 persons practice
snowmobiling throughout Quebec and its also an
appreciate activity by tourists by this way the total direct
economic repercussions are estimated at 752 M$ .
TRACK AND SUSPENSION
The upgrade that we’ve done to the suspension is basic, simple and it has a low
cost. The modification is basically to rearrange the
suspension’s geometry to make it work better. With this
improvement, the snowmobile gets a better power
transfer and an increase comfort on the sled. These
pieces are installed on the swinging arm of the
suspension. It stops the movement of the arm to couple
the two parts of the suspension. However, this
modification affects the total stroke of the suspensions
shocks. So that give a better agreement and handling to
the driver. Here is a view of the parts that is installed on
the sled’s
suspension.
EMISSIONS
In a perspective to improve the efficiency of the two
strokes engine and reduce the bad effect of the
combustion, several things on the original conception
needed to be changed. The big default of this type of
engine is the circulation of the air-fuel-oil mix in general.
This mix is created in the base of the engine and it
moves in the top of the cylinder by a difference of
pression generated by the displacement of the piston. To
permit at this mix to move, a duct between top and base
is present. This configuration is the principal cause of the
bad output of this kind of engine. A part of the mix can go
directly in the exhaust port before to be burned. In the
figure below, we can see all the path of the mix.
Noise Reduction
The noise produced by the snowmobiles is one of their
major drawbacks. It can bother the people living near the
trails and can be potentially harmful for the snowmobilers
themselves. That is why the noise reduction is one of the
main goals of the CSC. We can achieve this goal using
many different methods. We have used two separate
systems to ensure that our modified sled would be
quieter than the original version. We fabricated a totally
new exhaust system that as a good reduction of noise
without restricting the exhaust gas and insulated the
motor compartment with a new sound damping material.
Miscellaneous
Energy saving versus beam changing.
To get a better energy consummation at the
electric level, each part of the electrical wiring. The part
that could be change and whom could be able to reduce
the energy consummation was the beam in the front of
the sled. The original beams were removed and other
was found with the same brightness but with less energy
consummation.