Wednesday, April 28, 2010

Fastest Car - Diesel vs Petrol

Winning a race does not depend on the car alone but on the driving skills too. I never said petrol would win against diesel in city. In fact I wrote that in the city most of the time, the diesel would win. But city driving does depends a lot on individuals driving skills. Forget beating diesel with petrol, I may not be able to win if you were on the petrol and I on the diesel. It depends on the driving skills. But yes within the operating range in the city, diesel does pack in more power than the petrol. On the point of being a fastest car, I just say petrol would reach 100 km/hr faster from rest. On braking, well I am still not very sure but I would probably go by what is mentioned in the previous blog post. Braking distance does depend on the momentum of the moving body and diesel being a heavier car would have more momentum at a particular speed than the petrol.

I am not good at very fast driving but what I am trying to say is when you drive both, you feel the huge difference. I tried to be unbiased when I wrote about the difference but not sure I was really unbiased or not. Not sure if you have test driven Swift Diesel. If not, just try it once and let me know the experience. Petrol or Diesel, Swift Rocks.

Racing Swift VXI or VDI

I am not 100% sure about technically which one is capable to reach high speed sooner but when you drive you feel the difference. I have driven both and I am not ready to believe that petrol will beat the diesel in the city as mentioned in the previous posts in this blog. I will accept it if you beat me in city.

About the braking distance:

My understanding is torque is there even when you are not pressing the accelerator (idealing torque) which is higher than petrol. On a practical note, try the braking in both and you will certainly say that petrol's brake is quick and instant compared to diesel. If not torque, there may be some other reason but check that out. The diesel Swift weighs more than the petrol and the brakes in both cars I am sure are the same. So if you think braking distance of D is more than P, it could be due to that alone.

Swift Petrol or Diesel - Who Wins the Race

If there is a race between Swift Petrol and Swift Diesel, then a petrol car will only win in the race track or a drift because it has higher RPM ranges but it takes time to reach there. In city roads Swift Diesel is a clear winner. If you need power, go with Swift VDI.




A petrol car like Swift does not take more time to reach speeds. That’s only case if you consider same gear acceleration. Otherwise, it reaches 100 km/Hr a good 2 sec before diesel car. and on the quarter mile, the difference gets higher, so Swift VDI would not  be able to beat Swift VXI if both start from rest. Power would not be the right term I guess because theoretically it is the Swift VXI Petrol that has more HPs and HPs are the units for power. Yeah, if we substitute that with pulling power, well yes Swift VDi Diesel has more pulling power (i.e. torque) which is not exactly the same as power because you can vary the useful torque of an engine with gearing but the thing that remains constant is HP and that is what called as real power of a car.

One more point someone said, “VDI has higher torque and even though both use the same brake, braking distance will be a little more in VDI."



No, I don’t think torque has to do anything with braking because when you apply brakes, you are not accelerating. and the engine is not producing torque or rather transferring that torque on to the wheels because you either let go on the pedal or press the clutch. In either case, no torque is being transferred to the wheels.

Bolero GLX - 2000 Model Coolant Problem

Question:  I own a Bolero GLX - 2000 model, has run 70k kms till date. I having no problem at all, free sailing, and the only thing is it drinks too much of coolant. What can I do about this?


Answer:  Now you are in a state where the engine needs to be a cared a bit more then what you have been doing before. You absolutely HAVE TO change the oil and other fluids working directly on the engine once in 5k kms, especially be very careful of the engine oil grade stick to 20W40 come what may. Recommended brands- The Mahindra Maxilube or the Castrol GTX Diesel, both are 20W40 and rated CF-4, don't use or rather try to avoid Castrol GTD it is CD-4 and not highly recommended.

Get the coolant checked once in a week and always top up the bottle with distilled water and the radiator with coolant, but don't be too generous with the coolant. Every 10K kilometers drain the coolant and fill it up with fresh one. The Bolero now needs a bit of TLC, but if you don't miss out on the routine maintenance, the vehicle will easily go another 50K without a major rebuild. Hope this helps.

Diesel Car Maintenance Tips

Question:  Would like to know after how many kilometers, it is advisable to replace the following items, engine oil, oil filter, diesel filter, coolant, steering oil, and brake oil? Also there may be few things that I may have missed out, which I would like to know.


Answer: Best place to look for this information is the owner's manual, as it has periodic maintenance listed in a table with approximate kilometers required for a change in consumables. Regarding engine oil, I change engine oil at every 5K kms and diesel filter at 20K kms.

Question: Do you need to change coolant, steering oil, and brake oil periodically unless there is a problem or do you need to bleed the old one, fill in new? Actually I need to change my coolant frequently within a span of 3 months. Is it okay?

Answer: There is something wrong with your car. get your radiator, fan and hose checked. The coolant level dips very sharply and hence top it with plain water, but ultimately within a span of 3 months only water remains, hence, you need to fill the coolant again and no top up after 3 months.