What Is DTS-Si Technology And How Does It Work In Motorbikes?

by Kannan on July 28, 2010

As common biker or as laymen we keep hearing that so and so bike features what is called DTS-Si technology, but we hardly understand what it means except being familiar with the term maybe through the commercials/advertisements.

Well, the DTS-Si or the Digital Twin Spark-Swirl Induction is a technology where dual spark plugs are used and that it is known to give great mileage to the bikes and this is main purpose why the major bike manufacturers use the technology in their bikes. The DTS-Si technology will likely give unbelievable fuel efficiency provided the bike runs in standard test conditions.

Generally, the 100cc motorbikes do not offer such a mileage but the DTS-Si technology powered bikes give a greater mileage, which is the biggest advantage for the bikes. As the technology uses 2 spark plugs to initiate the combustion of air-fuel mixture, it leaves little unburnt fuel within the engine.

Why is the DTS-Si technology better than the conventional single spark plug equipped engine?

Apart from giving an amazing mileage to the bike, the engine enabled with DTS-Si technology does not compromise on technology. In a traditional single spark plug oriented the combustion process is very slow. This is because the spark plug is located at one end of the combustion chamber, which sparks the air-fuel mixture and the flame inflates like a balloon that takes some time to reach the remote corner of the combustion chamber that delays the combustion process. Whereas, in the DTS-Si technology equipped engine the cylinder head is fitted with two spark plugs at two of corners of the combustion chamber, which ensures that the sparks emit from two ends of the chamber and the air fuel mixture ignites to produce two flame fronts thus, the process of combustion is faster and also the pressure rises at a good pace. This technology in the engine promotes greater torque, fuel-efficiency and low emission.

What do the motorcycle makers have to say on the DTS-Si?

Hero Honda and Bajaj have had two different opinions regarding the performance of 100cc bikes performance in the market. Bajaj was of the belief that the demand for 100cc bikes was fast declining and with time the segment will not have many buyers. And Bajaj quickly testified their belief with the R&D team came up with the DTS-Si technology that ensured fast rate combustion and pressure rise. But TVS Motors claimed that the same could be achieved in a single spark too by inserting differential sparking cycles. There are other engine makers besides TVS who do argue that a good combustion chamber design will not have poor combustion issues, and that should a DTSSi technology improve fuel efficiency, then the combustion chamber design must be bad.

This could be individual opinions but we are seeing the Bajaj bikes; the 150cc and the 220cc ones featuring the DTS-Si technology for good. They have patents for these bikes in various countries. And it cannot be debated that Bajaj bikes with the technology sell like hell; a great marketing tactic and definitely an add on the consumers benefited.

Image Source: XCD135.Blogspot.com

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{ 8 comments… read them below or add one }

Guru August 6, 2010 at 2:13 pm

The unmatched mileage is good on paper and not on roads. Hero Honda still leads in fuel efficiency….DTSI engines are tuned for very lean burn to extract mileage(only selling point in india) but this leads to many issues…


harhsa September 30, 2011 at 2:37 pm

What is the neccessity of having offset inlet and outlet ports ,how excatly does it help for swirl induction .Anticipating a quick reply


ishor maharjan October 24, 2011 at 7:43 pm

as far as i know the offset configuration helps to give the fuel injection a swril movement because if you are injecting in a straight manner it will not spread and no swrill movement….but if you inject in offset to the wall of cylinder it will give swrill movement………


munna April 21, 2012 at 12:39 am

well dts-i or dts-si are making lots of difference from other bikes to bikes which are using this technologies.DTS-I is Digital Twin spark induction technology nothing but keeping twin spark plugs instead of only 1 and with offset ports.My doubt is how to produce Swirl in an engine like 100cc or 125ccor so on..??


mahendra singh chouhan August 10, 2012 at 2:31 pm

DTS_SI tech very good because iam using dts_si byke. First time see dual plug system


Mayank October 7, 2012 at 8:05 pm

there are few mistakes like instead of ports there are valves in diagram


jayant February 19, 2013 at 5:54 pm

Your explanation is very good


sumith July 25, 2013 at 10:11 pm

Yaa i believe dts -si engines i use discover which gives around 85 in local road conditions and more pick up than other 100cc bikes


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