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 TVS SCOOTY PEP
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Source Click here for Overdrive Subsription July 2003
 Engine & Transmission

Doing its bit to please both users and the greens.

Going four-stroke was the primary reason TVS decided to completely redo the Scooty and transform it into the Scooty Pep. The two-stroke has made way to the four throws of a completely new engine that displaces 74.6cc. The oversquare bore-stroke layout at 47x43mm endows the Scooty Pep with tremendous flexibility across the rev range. Making max power of 4.1bhp@6500rpm and max torque 5Nm@4000rpm, this horizontally laid out engine is truly a spirited performer. Power from her single pot is very linear thus ensuring acceleration is crisp and on tap at all times. Compression ratio at 10.1 is very high and could have resulted in pinging, what with the quality of fuel we use. The digital ignition however completely eradicates any such intrusions by optimising the ignition curve. The engine breathes through a Ucal Mikuni VM14 carburettor.

The engine also runs the same throttle actuated ignition switch first seen on the Victor, for maximum Fuel Efficiency. The ignition curve activating switch depends on throttle travel, a dual curve enabling the rider to switch from economy to power mode with just a flick. Green (for economy) and orange (for power) blinkers in the instrument indicate the mode.

Tipping the scales at 89 kilos the power-to-weight ratio at 46.06bhp/ton ensures she can take on rider and pillion (as long as they are not of the Hulk Hogan kind).
Torque to the driven wheel is transmitted via continuously variable transmission, which thanks to its virtue of letting the engine always operate in its optimum rpm range whatever the speed, helps gain the most efficiency from the plant.

On the flip side, TVS has resorted to a very lean combustion mixture to eke out the best Fuel Efficiency. Cold starts then can be a long-drawn affair in spite of the electric choke. Getting her up to her optimum operating range is also a tedious process. In the long run the constant jamming down of the ignition switch could affect the starter motor or you could put extra wear and tear on your shoe soles by constant kick-starting her to life.

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