DTSi Engine Technology – Understanding its need and working

Bajaj Pulsar 150 red

Remember those Bajaj Pulsar advertisements that boasted of the company’s new twin-spark technology named DTS-i? Well, this particular DTSi technology has taken the world by storm, as various manufacturers have now started coming with all-new bikes featuring multiple spark plugs in their engines. But what is this craze all about? Well, we at MotorCruze give you an insight about what this new ‘revolutionary’ technology is, and whether or not you should have it in your motorcycle.

Bajaj DTSi engine

And in order to understand what we are talking about, let us phrase down the entire article into a set of questions:

1) What are Spark Plugs used for?

Every gasoline-run automobile on this planet needs a source of ignition that burns the fuel when it enters the combustion chamber. In modern-day Internal Combustion Engines, this role of supply of ignition is handled by electronically actuated spark plugs. In simple terms, Spark Plugs are engineered to develop a spark when triggered by an electronic signal, thus igniting the available fuel in the cylinder.

2) What is the problem in using a single spark plug?

To optimize power delivery and fuel economy, it is essential that every drop of fuel that enters a cylinder is burnt completely before the next combustion cycle is executed. But perfect combustion is a myth, as no engine in the world can achieve it due to the presence of a wide range of losses present in the combustion chamber and the overall geometry of the internal combustion engine. With an engine that has a single spark plug per cylinder, the incomplete combustion of fuel gets even more pronounced, thus limiting power delivery as well as negatively affecting the fuel economy.

3) How can multiple spark plugs overcome this limitation?

Bajaj was the first motorcycle manufacturer in India which introduced a bike with multiple (two) spark plugs. This new innovation was termed as the DTSi technology, which was an abbreviation for Digital Twin Spark ignition. Bajaj engineers managed to locate an additional spark plug in the cylinder, which minimized the area where a drop of fuel can be left un-burnt. Through this DTSi engine, they engineered a technology that allowed more fuel to burn in a relatively smaller combustion cycle. This not only helped the bikes be more efficient, it also optimized power output and emissions.

Bajaj Pulsar RS200

4) Does presence of DTSi technology mean more power?

Not really! Yes you read that right. We know we have been appreciating DTSi engines ever since the article started, but it is essential to burst a myth bubble that has been imbibed into customers’ minds through aggressive advertising by manufacturers. It is not essentially the case that a DTSi engine (or a multiple spark engine) will produce more power than one with a single spark plug. As a matter of fact, the KTM Duke 200 produces more power than the Bajaj Pulsar 200NS, despite the fact that the former has a single spark plug while the latter gets three. Power output is an amalgamation of various factors, including fuel injection, compression ratios, and engine displacement. But it doesn’t really depend on the number of spark plugs used.

Also read: Bajaj Pulsar RS 200 vs KTM RC 200 vs Honda CBR 250R – Comprehensive Specs Comparison

And now the conclusion comes down to the basic question; should your bike have multiple spark plugs or not? This question has a very, very simple answer to it. If your bike has a large capacity mill, of more than 400 cc, it is best to have multiple spark plugs as a single unit won’t be able to ignite fuel in a relatively larger cylinder. On the other hand, for 100 cc commuter bikes, multiple spark plugs don’t really make a difference as the smaller cylinder can easily be covered by a single plug. Moreover, one more hole in a small engine head to house the spark plug would enhance stress on the engine’s wall. Hence, it can be a disadvantage rather than an advantage to have DTSi technology in small capacity commuter bikes.

Hope we have helped you understand everything about DTSi engine and multiple spark plug technology. Feel free to shoot any questions in the comments section if you have any doubts, and we will be more than happy to serve you.