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SHANKER | 07:52 Sun 18th May 2003 | How it Works
3 Answers
Why?
1) Some vehicles are front wheel driven while the others are back wheel driven?
2)Petrol is ignited by electric spark while diesel is ignited by compression and not the otherway ,for both
3)Wankel Engine is not popular despite its better efficiency
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Front and rear wheel drive offer different advantages. Front wheel goes better in the snow, while rear wheel giver better manoeuverability esp round tight corners
Petrol burns at far less temperatures than diesel so requires less compression and a simple spark to ignite it and because of the lower compression can reach far higher revs than diesel, while diesel engines are more powerful at lower revs because of the excessively high compression required to ignite the diesel fuel (if you compress air it cerate's high temperatures) so you have two different engines for different types of vehicles (although diesel's have improved immensely in the last 15 years)***** Wankel Rotary Engines are not as reliable as conventional engines they don't last nearly as long so there efficiency is negligible comparison.
front wheel drive is cheeper to produce and and saves space becouse all the drive components are in one place.

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