Answer / mukesh vaishnav

the engine of cars were according to the BS-III norms, but after that all the new cars manufactured are as per BS-IV norms which is stricter engine emission norms . These norms make the engine give good mileage with little carbon fumes and are silent too, so the new engine is more eco friendly than the older ones. And i guess every city has different norms requirement when you buy a new car.

Answer / venkat

In BS-lll engine compared to BS-lll engine only difference is emissions control I.e NO,CO and HC are less in BS- lll engines and BS-lll has turbocharger with intercooler.

Stiff spring is used in the selector mechanism a) To prevent engagement of two gears simultaneously b) To prevent engagement of reverse gear c) To facilitate the gear selection d) To avoid the necessity of having neutral gear

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