Guide: How To Drive and Maintain a Diesel Car?

[TSIVipul]

Meagle is better or mhawk ? And why ?

Being true mHawk is a more tech laden and hence a better engine.
I love mEagle for its top end and quite high revving nature.Which is missing in all other diesel engines.
Secondly it has got higher displacement too and hence is easy to work in the lag or N/A zone too.

I think what he have said may be like he was driving in the fifth gear at 2500 rpm and then he was able to accelerate the car and it was able reach 150+.Correct me if I am wrong.

Please elaborate buddy,I am unable to completely understand what you meant.

Manza has the 1.3 MJD VGT which is 90 hp approximately.

I mentioned 75 hp about Xylo D2 not Manza.

I would say mHawk is better because -

1) It is a more advanced engine
2) It has an aluminum head
3) It is lighter
4) It has VGT
5) Inspite of being 2.2 litre, it makes more power than the mEagle
6) It is more refined
7) Power delivery is quick and linear

+100..all points are simply spot on.
One more:Lighter engine aids driveability too and hence improves handling a lot.

Very very nice thread ! Kudos Raj_5004 for this nice diesel tutorial, and all other diesel enthusiasts thanks for sharing your valuable knowledge... Keep goin...

No doubt,+100.

 

[sandy_fluidic]

Thouroughly read the thread and i must say now i have grabbed lot of engine knowledge. Kudos to Raj and others who have given their best in this thread. All my queries and mine little knowledge about diesel engine shared in this thread. Keep it up.

 

[nozzlering]

All
I have a query in Renault pulse the SA told me put the car in 5 gear and at speed of 40 he told me to remove my leg from the throttle and believe me the car kept moving at that speed without any input from me for 4 to 5 kms why so ?

If the road is straight or downward slope (atleast) and minimal load, yes the car will continue to roll on its own. There is a minimum fuel feed too at zero throttle. (Thats how we start off in first gear without using throttle, and same amount of fuel is being fed to engine, irrespective of any gear) .
Try the same car, with same SA on a road with slight upward slope. I assure you, the car will start jerking and you'll have to go down one or two gears.

 

[nozzlering]

I can't believe it.150+ in 2.5k rpm.By this way Manza will do 250+ in 4.5-5k rpm range...
even my Corolla don't do such speeds at such low rpm in even 6th gear.And then Manza does not go over 165-170(I did till 165),so how is it possible.
Get the tachometer of the car checked buddy.BTW,in the top gear,Manza can't even touch 5k rpm.There is enough load on engine to stop it from touching such high revs.

Recently I did 120-130 kmph on highway (tacho reading 2.5-3k), quite easily.

• The road was smooth and more or less even.
• The traffic was minimal, and one way only.
• Load: 2 adults + 1 child
• Airconditioner ON

Believe me, I felt I could go for more. Once the car gains momentum, she likes to be pushed more. But going beyond 5000 rpm is doubtful. If you are doing so, you are screwing up your uncles' car's engine. I feel the pain, because its a Manza too



Mods: Kindly excuse for back to back posts. Merge if needed.

 

[TSIVipul]

@Nozzle:
Buddy I am not saying that Manza can't do 120 at 2.5-3k rpm,what I am saying is that Manza can't do 150 at 2.5k rpm.
My Manza experience is:-
Car:Tata Manza Quadrajet90(Very first batch,just a week after launch)
Top speed:Between 160-165 kph.
100 kph-About 2000-2100 rpm in 5th gear.
About 2700-2800 rpm in 4th gear.
About 3500-3600 rpm in 3rd gear.

Top speed in second gear was about 70 kph with rev needle not red.

And in 5th gear it was unable to go above 4000-4100 rpm at 160 kph unless I downshifted to 4th gear and revved it to 5000(it hadn't reached 5000 in 4th too as needle hadn't became red) at about 165 kph and then upshifting to 5th gear but still no more progress in fifth gear as expected.

I hope mine and your experience will be about 50-60% same.Kindly verify it for me..

 

[nozzlering]

I need to verify it myself. I have never driven considering speed and rev parameters. I cant judge your statement or type-r statements. Since I own a Manza, I can anytime check it myself. Will let you know once I check it. Though I personally feel, doing 150 at 2.5 seems to be difficult (unless I check it I can't rule it out too).

 

[TSIVipul]

Ah I got it,maybe he pressed the clutch leaving the gas pedal at 150 kph and saw the revvs falling till 1k rpm..,see this way Manza can do 150 at just 1k rpm.

BTW,please don't check the car my way,it will be painful for you.It will strike your heart saying "Why to give such beating to my own car"?

Still if you can verify,then its great.

 

[type-r]

Recently I did 120-130 kmph on highway (tacho reading 2.5-3k), quite easily.

• The road was smooth and more or less even.
• The traffic was minimal, and one way only.
• Load: 2 adults + 1 child
• Airconditioner ON

Believe me, I felt I could go for more. Once the car gains momentum, she likes to be pushed more. But going beyond 5000 rpm is doubtful. If you are doing so, you are screwing up your uncles' car's engine. I feel the pain, because its a Manza too



Mods: Kindly excuse for back to back posts. Merge if needed.

buddy thanks for your concern. it was just a one time thing to check the ability of Manza's engine. not happening again. see you also got that feeling righit? i just had my foot planted and the speedo kept climbing. i tried to do the same thing even in his old Indigo LX. that was slow to 80 but in the right gear at the right time, that thing can also get some speed quite quick. i maxxed that 135 then didnt have courage to push it more since it was wobbling too much.

 

[type-r]

Ah I got it,maybe he pressed the clutch leaving the gas pedal at 150 kph and saw the revvs falling till 1k rpm..,see this way Manza can do 150 at just 1k rpm.

BTW,please don't check the car my way,it will be painful for you.It will strike your heart saying "Why to give such beating to my own car"?

Still if you can verify,then its great.

i just checked with my driver in India and he said that i did not do 2.5K RPM at 150. it was like around 4-4.5K RPM. sorry for confusion guys!

 

[TSIVipul]

i just checked with my driver in India and he said that i did not do 2.5K RPM at 150. it was like around 4-4.5K RPM. sorry for confusion guys!

Ah,that means your foot was on the accelerator(no offence)...


@Nozzlering:
An uncle of mine from merchant navy told me that ships does not use diesel as a fuel instead they take some oil called 'heavy oil' and purify it on-board to get the usable diesel.
What is this heavy oil?
Is the diesel obtained pure?
Why ships don't use engines like CRDI's or turbocharged engines,instead they use 2-stroke engine?

 

[type-r]

i didnt get that but anyways...

i know that Xylo is too underpowered but it returns excellent FE!! and i think that is a good exchange. that is another benefit of diesel cars.

 

[nozzlering]

Ah,that means your foot was on the accelerator(no offence)...


@Nozzlering:
An uncle of mine from merchant navy told me that ships does not use diesel as a fuel instead they take some oil called 'heavy oil' and purify it on-board to get the usable diesel.
What is this heavy oil?
Is the diesel obtained pure?
Why ships don't use engines like CRDI's or turbocharged engines,instead they use 2-stroke engine?

Thanks for clarification type-r.

Well Vipul, you have too many questions...And I will try to answer all of them.
Why this heavy oil? When crude oil is passed through fractional distillation, heavy oil is one of the residual left over after gases, petrol and diesel are extracted. Its dark in colour, looks like tar. But it has high calorific value, though highly viscous. Also it has left overs of chemical used while fractional distillation. The main reason for using this oil is COST. When you use 30t tons to 125 tons of fuel per day (depending on engine size), cost of fuel matters a lot.
Is the diesel obtained pure? The heavy fuel remains in same form. But after purifcation, water and heavier impurities are separated from the oil. The heavy oil viscosity is around 380 cst at 15 deg C (High speed diesel which we use in our cars have viscosity of 6-7 cst. @ 15 deg C). So the fuel oil is heated to about 130 deg C to bring viscosity to 12 cst to achieve atomisation. It also helps to fulfil anti pollution criteria.
Why ships don't use engines like CRDI's or turbocharged engines,instead they use 2-stroke engine?
Ship's engines have been turbocharged ever since I know. I have seen upto 3 turbochargers on an engine. Unlike the pulse turbos on our cars, they have constant pressure turbos (most suited for variable rpm range). Will talk in detail later.
They have already come up with CRDI engines. And to add to it, camless engines!! Highly efficient.
The ship's engine should follow these criteria

• Should be powerful
• Highly efficient
• Comply with antipollution norms
• Should take minimal space (On a ship, space means money. More space means more cargo----more money).

2-stroke engines are more powerful than 4 strokes because of higher number of power strokes per cycle.
If 4 stroke engine was used, the weight of flywheel would have been enormous.
Ships' engines cc is increased by increasing stroke length (super long stroke engines). This way power output can be increased without increasing the engines length, so that we have extra space to carry cargo.
2 stroke engines can easily run at dead slow speeds (about 30 rpm).
I forgot to tell, ships' engines are slow speed engines (our car ones being high speed) max 110 rpm.
Though ship's engine uses heavy fuel, they are highly environment friendly.
I hope I have been useful here.

 

[Prads]

@ nozzlering

A friend of mine who is also in merchant Navy told me they use regular diesel when the engine is being started ,once it has reached running temp then they introduce this crude fuel in,he told me this crude fuel is tough to get off your skin if you happen to get it on you.

 

[nozzlering]

@ nozzlering

A friend of mine who is also in merchant Navy told me they use regular diesel when the engine is being started ,once it has reached running temp then they introduce this crude fuel in,he told me this crude fuel is tough to get off your skin if you happen to get it on you.

In earlier days, YES. Now engines are designed to start, run and stop on heavy fuel oil. No need of diesel oil. (Except some European countries and some ports of US, where you must use diesel oil only, and too of low sulphur grade).
Not difficult to get off your skin. But yes if it gets on your clothes, its hard to get it off.

 

[jihu123]

so, guys, I have a query on AC. Is it recommended to switch off the engine before switching off the AC? Coz it happened a few times!