Internal Combustion Engine and Twin Spark

Topics: Internal combustion engine, Ignition system, Spark plug Pages: 13 (2292 words) Published: April 8, 2013
Revolution of Twin
Spark in I.C. Engine
Soumen Das


3rd Year, Sixth Semester
WBUT Roll No. 09101007038

Under the Guidance of

Dr. N. Mukhopadhyay
[B.E(NIT) , M.B.A(JU), Ph.D. (Engg)]

1. Abstract
2. Introduction
3. Digital Twin Spark ignition engine
4. Main characteristics
5. Engine construction
6. Constructional Detail
7. Valve drive
8. Fuel feed
9. Working
11. Ignition with a Digital C.D.I.
12. Ignition
13. Mathematical Model
14. Advantages of using Twin Spark
15. Disadvantages of using Twin Spark
16. Conclusion
17. References


A New Revolution of Twin Spark in I.C. Engine

It is very interesting to know about complete combustion in automobile engineering, because in actual practice, perfect combustion is not at all possible due to various losses in the combustion chamber as well as design of the internal combustion engine. Moreover the process of burning of the fuel is also not instantaneous. However an alternate solution to it is by making the combustion of fuel as fast as possible. This can be done by using two spark plugs which spark alternatively at a certain time interval so as increase the diameter of the flame & burn the fuel instantaneously. This system is called DTSI (Digital Spark Ignition system). In this system, due to twin sparks,

combustion will be complete.
This paper represents the working of digital twin spark ignition system, how twin sparks are produced at 20,000 Volts, their timings, efficiency, advantages & disadvantages, diameter of the flame, how complete combustion is possible & how to decrease smoke & exhausts from the exhaust pipe of the bike using Twin Spark System.


A conventional 4 Stroke engine has a Single Spark Plug located at one end of the combustion chamber and hence the combustion is inefficient leading to sub optimal mileage and sub optimal performance & can even have problems with oil flow. Hence forth there was a requirement to change engines' design, fuelling, ignition, production and quality to achieve the following objectives. Uniform power delivery in all operating conditions: A high degree of drivability

 First rate standards of reliability
 Long service life.

With a view to overcome the above limitations a new patent was introduced that is known as DTS-I technology & its use is increasing day by days.
ignition engine has two Spark
plugs located at opposite ends of
the combustion chamber and
hence fast and efficient
combustion is obtained. The
benefits of this efficient
combustion process can be felt in
terms of better fuel efficiency and
lower emissions. The ignition
system on the Twin spark is a digital system with static spark advance and no moving parts subject to wear. It is mapped by the integrated 3

digital electronic control box which also handles fuel injection and valve timing. It features two plugs per cylinder.
This innovative solution, also entailing a special configuration of the hemispherical combustion chambers and piston heads, ensures a fast, wide flame front when the air-fuel mixture is ignited, and therefore less ignition advance, enabling, moreover, relatively lean mixtures to be used. This technology provides a combination of the light weight and twice the power offered by two-stroke engines with a significant power boost, i.e. a considerable "power-to-weight ratio" compared to quite a few four-stroke engines. The

actual picture of Bajaj Pulsar
Bike is Moreover, such a system can
adjust idling speed & even
cuts off fuel feed when the
accelerator pedal is released,
and meters the enrichment of
the air-fuel mixture for cold
starting and accelerating
purposes; if necessary, it also
prevents the upper rev limit from being exceeded. At low revs, the over boost is mostly used when overtaking, and this is why it...
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