What is exactly DTS-i ,DTS-Si and DTS-Fi?
The cycle begins when the piston is furthest away from the crankshaft. On the first stroke (intake/induction)
of the piston, as the piston descends it reduces the pressure in the
cylinder, a mixture of fuel and air is forced, by at least atmospheric
pressure, into the cylinder through the intake port. The intake valve
then closes and the following stroke (compression) compresses the fuel-air mixture.
The
air-fuel mixture is then ignited, by a spark plug, at approximately the
top of the compression stroke. The resulting expansion of burning gases
pushes the piston downward for the third stroke (power) and in the fourth stroke (exhaust) the piston pushes the products of combustion from the cylinder through an exhaust valve or valves.
 DTS-i Engine -  DIGITAL TWIN SPARK 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.DTS-i Engine can be further tuned to deliver exhilarating performance as in DTS-FI or exceptional mileage like in DTS-SI as claimed by Bajaj. The use of twin spark plugs has been around for decades mostly in the engine of Alfa Romeo, Honda and on large capacity Ducati engine etc. Bajaj however have patented the technology for small capacity engines.
DTS-Si Engine -
Like DTS-i the engine has 2 spark plugs, but, instead of conventionally positioned straight ports, the offset positioning of the ports generate high swirl and turbulence of the air fuel mixture in the combustion chamber. This results in highly efficient combustion that further results in exceptional mileage. Like the mother DTS-i technology, the DTS-Si technology is a patented technology developed by Bajaj Auto R&D. This technology is used by Bajaj in its recently launched 125 cc Bajaj XCD. Recently, Bajaj Auto was in the news for accusing TVS Motors, long-standing rivals of patent infringement on the DTSi technology. TVS countered by threatening to sue Bajaj Auto for libel. DTS-Fi- DTS-Fi stands for "Digital Twin Spark Fuel Injection", a ‘Bajaj Patented Technology’. In fuel injection the conventional carburettor has been replaced by injector which injects fuel in to the engine in a spray form based on the instructions of the Engine Control Unit (ECU) which is a part of the Engine Management System EMS. The Electronic Control Unit (ECU) is microprocessor based and is the brain of the fuel injection system. It processes information sent by various sensors and instantly determines optimum fueling and spark timing for various engine operating conditions. The ECU contains detailed information of the engine's characteristics from which it picks the necessary data for commanding both fueling & spark timing. The main advantages of Fuel Injection are: a. Increased power output for same cc. b. Better low end torque. c. Lower fuel delivery & optimisation of spark timing. d. Improved cold start, quick warm-up and excellent response to sudden acceleration. e. Lower emission levels. f. Self detection and communication of fuel system malfunctioning if any. ExhausTEC
ExhausTEC
stands for Exhaust Torque Expansion Chamber, a Bajaj Auto trademark.
The technology involves use of a small chamber connected to the exhaust
pipe of the engine to modify the back-pressure and the swirl
characteristics, with an aim to improve the low-end performance of the
bikes. This was attempted in response to the issue of a reported lack of
low-end response in Bajaj's single-cylinder four-stroke engines. The
ExhausTEC technology is claimed to be highly effective in improving the
overall engine response, especially the low-end torque characteristics.
This enhanced performance is claimed to come at no loss of top-end
performance or engine smoothness.
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Discover ST 125
Bajaj Auto Limited announced the launched of the new 2012 Bajaj Discover and also unveiled the new look of the commuter bike. Looking at the design of the new Bajaj Discover, graphics section has been totally changed. The main thing to be noticed about the bike is that, the change which the bike has undergone is really good unlike the Bajaj Pulsar 200NS.
Full Specifications
Discover ST 125 (Sports Tourer), is a new range of sports commuter motorcycle with new features like brand new headlamp, a new instrumentation console, a new 10 liter fuel tank, new alloy wheels and a monoshock rear suspension. The grab rail, the side panels, new mudguard, a new exhaust muffler and an exposed O-ring based drive chain are also few of the changes made to the bike.
The phenomenal change brought to the sports commuter motorcycle is the on engine. Air cooled engine, 4 valve head, twin spark DTSi are the changes made to the Discover ST 125 (Sports Tourer). The Discover ST 125 (Sports Tourer) is the first one to feature 4 valve head on a 125cc bike in India. The other thing worth mentioning is that, the Discover ST 125 is the second one to feature a monoshock after the Bajaj Pulsar 200NS.
Discover ST 125 engine produces a peak power of 13 PS at 9,00 rpm, while peak torque is 11 Nm at 7,000 rpm.
Availability: By the end of June 2012.
Speaking about the launch of the Discover ST 125 (Sports Tourer), Rajiv Bajaj, Managing Director said that, to increase the growth of the brand, they will be bringing in changes to their bikes every year.
Note : New Bajaj Discover 4G is different from the Discover ST 125 (Sports Tourer)
Specifications :
| Engine | 4 Valve Twin Spark Air Cooled |
| Engine Displacement | 124.6cc |
| Max.Net Power | 13 Ps @ 9000 rpm |
| Max.net Torque | 1.1 kgm @ 7000 rpm |
| Ignition System | Digital CDI |
| Carburetor | CV type |
| Starting | Self + kick start |
| Front Suspension | Telescopic Fork with Anti-friction DU Bush |
| Rear Suspension | Nitrox Monoshock with gas canister |
| Front Brake | Petal Disc 200 mm |
| Rear Brake | Drum 130 mm |
| Transmission | 5 Speed Constant mesh |
| Frame | Semi Double cradle |
| Front wheel / tyre | New design alloy / 2.75 X 17” 41P Tubed |
| Rear wheel / tyre | New design alloy / 3.00 X 17” 50P Tubed |
| Fuel Tank | 10 L |
| Wheelbase | 1305 mm |
| Seat Height | 800 mm |
| Turning Circle Radius | 2100 mm |
| Ground Clearance | 170 mm |
| Kerb Weight | 124.5 kg |
| Max Speed | 105 kmph |
| System | DC Ignition |
| Battery | 12V 5AH |
Suzuki Hayate and Honda Dream Yuga
 |
| Dream yuga Vs Hayate |
Design:
Suzuki Hayate’s tank design has been ripped from Suzuki GS150r but when comparing the tank design with that of Honda’s low cost bike Dream Yuga, the later one’s look pretty decent, though it too has been ripped from Honda Shine.
Colors:
Suzuki Hayate – Monsoon Grey Metallic, Aplha Red Metallic, Maple Brown Metallic, Force Silver Metallic and Black.
Honda Dream Yuga – Pearl Mirage White, Metallic Lush Green, Pearl Mica Red, GL Sparkle Black and Metallic Flint Grey.
Comparison :
| Suzuki Hayate | Honda Dream Yuga | |
| Engine | ||
| Type | Air Cooled, 4 Stroke, 1 cylinder, SOHC, 2 valves | Air Cooled, 4 Stroke, SI Engine |
| Bore X Stroke | 51.0mm X 55.2mm | 500MM X 55.6MM |
| Displacement | 112.5cc | 109CC |
| Compression Ratio | 9.5:1 | 9.0:1 |
| Fuel System | Carburetor | Carburetor |
| Starting | CDL/Electric & Kick | Self/Kick |
| Lubrication System | Wet sump | Forced & Wet Pump |
| Transmission | ||
| Clutch | Wet multi plate type | Multiplate clutch type |
| Transmission | 4 speed constant mesh | 4 Speed constant mesh |
| Brake | ||
| Front | Drum | Drum 130MM Dia |
| Rear | Drum | Drum 130MM Dia |
| Tyre Size | ||
| Front | 2.75-17 41P | Tubeless 80/100-18 47P |
| Rear | 3.00-17 50P | Tubeless 80/100-18 54P |
| Dimensions | ||
| Length | 2030mm | 2022 MM |
| Width | 720mm | 733MM |
| Height | 1070mm | 1095MM |
| Wheel Base | 1260mm | 1285MM |
| Ground Clearance | 175mm | 161 MM |
| Kerb Weight | 112kg | 108 KG |
| Electrical | ||
| Ignition Type | CDI | Fully Transisterized |
| Fuel Tank | ||
| Capacity | 8.0L | 8 litres |
| Price | Rs. 40,162 | Rs.46,000 |
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