Torque - In Diesel and Petrol engine

Hey Kabir,

A diesel car has lesser rpm and the flywheel is heavier. Being heavy, the amount of energy stored in the flywheel is greater and hence the rpm doesn't drop that fast. 

Performance freaks reduce the mas of their flywheel. this helps them to attain higher rpm more quickly but at the same time rpm reduction is also very quick and thats why diesel car's rpm doesn't fall that easily as diesel car has more torque as compared to petrol engines.

Cheers

Many thanx Rachit for a quicker reply,

Are you Blackberrying all your mails?! Anyways, great information.

If buying price is not an issue, if running cost is not a concern, if resale value is not important, then, which one is better the VDi or VXi – the D’Zires, in context with sheer driving pleasure, in the city and long distances too?

I drove from Delhi to Ahmedabad, and with respect to it I have few questions, but I guess I’ll start a new thread for it.

TC.

Kabir

Diesel versions of Swift & Dzire are better than their petrol counterparts - better performance & driving pleasure. Speaking in general... Petrol cars have better power to weight ratio that enables better pick-up & quick getaways through city traffic. Diesel cars have higher torque enabling better roll-on accelaration - making overtaking easier on highway/highspeeds.  As such, Diesel engines are stronger, sturdier & have better longevity, and resale value too.

Oh yes, that will be great. Please do that. Thanks.

Thank you Pankaj for your Maruti specific and general comparison for a Diesel v/s Petrol engine.

As I have mentioned earlier I had to switch from Swift VDi to D’Zire VXi. But may be in near future I shall buy a car so kind of getting all the information before zeroing on a particular type.

From Kalkaji (New Delhi) at 1530 hrs to Ambawadi (Ahmedabad) at 0435 hrs (next day), it was a super experience, simply awesome. Just to compare the travel time - The Ashram Express 2916, leaves Cantonment at 1530 hrs and reaches Sabarmati (one stop before Ahmedabad) at 0730 (next day), so the D’Zire took approximately three hours less than the Train. I am collating all the information, like – time at individual toll gates so to give detailed report of which leg of Delhi – (four lane) - Jaipur – (six lane) - Nashirabad – (four lane) - Udaipur – (four lane) Ahmedabad was good/not so good. I have retained the toll fee receipts, so shall check and put the pen to paper during this weekend.

Cheers!

Kabir

Both are good in terms of performance. If your travelling is less go for petrol else for diesel. The only reason why I won't go for diesel because Maruti has made the front suspension stiffer in the Diesel variant, which effects the ride quality to a certain extent. Else its fine.

gr8 discussion by u guyz.. but i still have few questions regarding the concept of torque and rpm.. I read smwhr that one gets torque even at zero rpm.. howz that possible? i mean torque is basically a force which causes a tendency to rotate, so how come it appear appear at zero rpm? has that smthing to do with load?

There should not be any confusion here.

At zero RPM-the engine is OFF-so neither is there torque nor power!!

@Tripti, what you read probably meant torque at stand-still (i.e., when the car is not moving - zero speed). In this case if the engine is running, the car will put out power (torque) onto the road via the wheels once the vehicle is put in gear and the clutch is engaged.