Go Back   Team-BHP > Under the Hood > Technical Stuff

Thread Tools Search this Thread
Old 1st August 2005, 16:24   #1
Join Date: Apr 2005
Location: Delhi
Posts: 63
Thanked: Once
Question Swift (Running-in) Query

Following is mentioned in owners manual and service booklet of my new swift.

"Avoid prolonged vehicle operation at a constant speed.Moving parts will break in better if u vary ur speed"

What is the meaning of the above statement?

abhi1881 is offline   Reply With Quote
Old 1st August 2005, 16:43   #2
Xsailor's Avatar
Join Date: Jun 2005
Location: Noida
Posts: 128
Thanked: 0 Times

Do not drive for too (I know, rather ambigous once again) long at the same speed/revs. I recall this fact nicely detailed elsewhere on the forum - you gotta keep changing the revs and speeds at practical intervals so that your engine gets a dose of running-in at all variable revs (well short of the red line for the first few K kms if you ask me!).

Seek (the forums a bit more), and you shall find.

On a similar note, I recall our Supermod GTO mentioning about his babies, all of them well over 120,000 kms each and no engine work on any of them! This running-in really helps and is applicable to ALL mechanical parts, be it in a car or elsewhere.

Xsailor is offline   Reply With Quote
Old 1st August 2005, 16:46   #3
Join Date: Jun 2005
Location: Bangalore
Posts: 690
Thanked: Once

It means what is says. Dont run the engine at a constant speed for long. Keep changing speeds.
Vivekphadnis is offline   Reply With Quote
Old 1st August 2005, 16:54   #4
Xsailor's Avatar
Join Date: Jun 2005
Location: Noida
Posts: 128
Thanked: 0 Times
Default View this..

Hey abhi,

View this thread for all the Gyann on your query
http://www.team-bhp.com/forum/showth...eferrerid=2519 (Tips reqd in handling new Swift)

Xsailor is offline   Reply With Quote
Old 1st August 2005, 17:37   #5
Join Date: Apr 2005
Location: Delhi
Posts: 63
Thanked: Once

Thanks all for the information...........
abhi1881 is offline   Reply With Quote
Old 1st August 2005, 17:41   #6
Join Date: Jul 2005
Location: Bangalore
Posts: 6
Thanked: 0 Times

Hi All, I came across this post on Engine breaking-in(running-in) in an old forum - am pasting it verbatim as it gives a reason for it's actions.
Am biting my fingernails after reading it as I just took my Jul 26 delivery Swift for a long drive this weekend - anyway here goes -

Ben's guide to 4-stroke engine break-in:

The Practice. For the first 100 miles, only take short trips of <15
minutes. Do not rev above about 3500 rpm. Use full throttle in short
(2-3 second) bursts at low rpms (say 2500) - 5th gear on the freeway
is ideal for this. Do not do more than one full-throttle burst in the
same 2-minute period. Avoid driving for more than 2-3 minutes at the
same rpm - if you are on the freeway, vary your speed and alternate
between 5th and 4th gears.

>From 100-500 miles, increase the peak RPM you reach by 200 rpm each
time you drive the car (but don't go higher than redline). Do not rev
to your new peak under heavy throttle; instead, let the engine drift
up to the rpm under light load. For instance, pulling away from a
stoplight, leave the engine in first and accelerate lightly until you
reach the desired RPM, then shift. Continue the full-throttle-burst
procedure. Do not rev the engine high under full throttle, and do not
do either the peak-revving or the full-throttle procedure more often
than once a minute. Avoid driving for more than 5 minutes at any one
rpm - again, alternating between two adjacent gears and varying your
speed will work.

You will notice that each time you reach a new peak rpm, the engine
will be quite loud at that rpm, but after a few runs up it will quiet
down. This is a sign that the break-in is proceeding well. You will
want to have revved the engine to 6500(5500) rpm a few times by the
time you reach 500 miles. At that point I recommend you change the
oil, as most of the metal wear and contaminants from break-in are
released in the first 500 miles.

>From 500-3000 miles (the extended break-in) you can operate your
engine fairly normally. Most of the work is done. You should still
run the engine at higher RPMs on a regular basis (assuming you don't
in the normal course of driving ;-) ) and you should avoid prolonged
high-speed/high-stress operation, like racing or cruising at 110 mph.
I personally change the oil after 1500 miles since it will be dirtier
at that point that it would be after 3000 miles of post-break-in
operation, but it isn't critical. Be sure to change it at 3000 miles,
however. Although there is some difference of opinion on what KIND of
oil to use during break-in, the general consensus is to use normal
(non-synthetic) oil of the recommended weight (5- or 10-30).

>From 3000 miles onward, your engine is considered broken in. It will
probably continue to "loosen up" a bit over the next 3000-6000 miles,
so look for a small increase in gas mileage. Other than that, your
engine is now be ready for a long and productive life. Enjoy!


The Theory. The primary goals of engine break-in are: 1) achieving a
good seal between the piston rings and cylinder walls, and 2) allowing
the engine to operate correctly throughout its RPM range. The major
enemy during the break-in period is localized heat buildup, mainly in
bearing surfaces (most notably the crankshaft bearings).

Initial state: When the engine is machined at the factory, many
wearing surfaces (places where parts rub against each other - cylinder
walls, bearings, etc) are purposely machined more roughly than they
could be. The reason for this is that it allows the engine to
complete the machining/polishing as it operates, thus allowing for the
individual variations inherent in any manufacturing process. This
wearing process, when complete, produces parts which will fit together
with very tight tolerances. However, the process also involves a
great deal of friction, which in turn means a great deal of heat. As
metal parts heat, they expand slightly. If the expansion goes beyond
a certain point, the parts will tend to bind with and/or score each
other. This must be avoided.

[To put this in plain english, the parts which rub against each other
are left a bit rough, and as the engine runs the parts will scrape
against each other until they wear down a bit and have a proper fit.
While they're still in the process of scraping, they can get very hot;
if they get too hot, they will damage each other in a permanent way.]

Since this sort of heat buildup is very localized, it will not show up
on the engine temperature gauge. Therefore, it is important to
operate the engine in such a way that the heat buildup will not reach
a dangerous level. More on this later.

Stress and Variation: Although the engine parts are metal and, as a
rule, quite rigid, they are still subject to slight deformation when
stress is applied. The largest stress in a piston engine is that
produced by reciprocating parts. The forces involved increase with
the square of the RPM. Any deformation will necessarily involve a
change in some tolerances inside the engine. Thus, in order for the
engine to operate properly over a range of RPMs, it is important that
it be exercised over this range during the break-in process so that
the wearing parts will experience the range of tolerances they will be
subjected to during normal (post-break-in) operation. Further, for
the wearing surfaces of reciprocating parts (most notably the piston
ring/ cylinder wall interface) operation at a single RPM for an
extended period of time will cause the machining process to progress
significantly further within the confines of the part's range of
travel without progressing at the point just outside that range, thus
building up a small ridge of metal just above the point of maximum

[In order for your engine to run well from 1000 to redline, you need
to operate it at all those rpms while it is breaking in. If you
don't, the parts won't be used to working at the rpms you neglected,
and they won't work as well at those speeds]

Piston Ring Sealing: The seal between the piston ring and the cylinder
wall is crucial to getting good economy and performance from the
engine. A bad seal will allow more blow-by, reducing the amount of
power the engine can produce with each power stroke and thus reducing
both its horsepower and fuel economy, as well as allowing combustion
gasses to get into the crankcase and contaminate the oil AND allowing
oil to get into the combustion chamber and be burned, producing the
characteristic blue-smoke-from-the-tailpipe syndrome (note that oil
can also get into the combustion chamber via the valve stem guides,
but that's not something we can do much about during break-in). The
key to getting a good piston ring seal is high combustion chamber
pressures. Embarrassingly, I don't know why (can someone fill me
in?). High combustion chamber pressure is produced under hard
acceleration; also, the lower the RPM the longer that pressure is
maintained during each power stroke. SO - to get a good piston ring
seal, hard acceleration at low RPMs will give the best results.
Since hard acceleration also produces more heat and more stress
(leading to friction and still MORE heat), it should only be used in
brief bursts, followed by a couple of minutes of "normal" low-stress
operation to allow the heated parts to cool down.

Localized Heat Buildup:
As previously mentioned, wearing parts will produce inordinate
amounts of heat as they polish each other. This produces local points
of intense heat inside the engine, with temperatures far higher than
the engine as a whole (which shows up on the temperature gauge) or
even of the surrounding parts. The most susceptable points in an
engine for this kind of heat buildup are the crankshaft bearings,
which must withstand enormous stress and pressure. If the bearings
are allowed to get too hot, they will expand to the point of scoring
each other or (*gulp*) binding, producing a spun bearing. During the
initial stages of engine break-in, there is no satisfactory way of
keeping these bearings cool during even mild engine operation except
to turn the engine off after every 10-15 minutes of operation and
allow the bearings to cool down.

The theory I have outlined about should now be sufficient to explain
the "practice" section of the break-in instructions. For the first
100 miles, keep the rpms low and the trips short to minimize the
stresses and heat buildup in the bearings, and use short full-throttle
bursts to seal the piston rings. From 100-500 miles, gradually
increase the RPMs to allow the wearing surfaces to correctly mate, and
continue using full-throttle bursts to ensure ring sealing. Use
cooling periods (the 1-minute rule) to minimize the heat buildup
produced by the high RPM operation and the full throttle bursts. At
500 miles, change the oil to flush out all the metal particles
produced by the wearing process.

Hope this helps all of you new car owners!

- Vinay
vsatyan is offline   Reply With Quote
Old 1st August 2005, 17:42   #7
Join Date: Apr 2005
Location: Delhi
Posts: 63
Thanked: Once

One more thing at what maximum speed i can drive on highway?Actually i am going to chandigarh this weekend.
My car has done 370Kms and also has not been serviced yet.
abhi1881 is offline   Reply With Quote
Old 1st August 2005, 18:03   #8
Senior - BHPian
Surprise's Avatar
Join Date: Feb 2005
Location: Chennai
Posts: 2,252
Thanked: 86 Times

Originally Posted by abhi1881
One more thing at what maximum speed i can drive on highway?Actually i am going to chandigarh this weekend.
My car has done 370Kms and also has not been serviced yet.
Earlier I had read some posts on the same. Some say that new engines are all capable of taking the test straight away i.e no need to maintain below certain speed till certain kms clocked on the odometer. Some are against this saying we should not revv high for the initial 1000 kms.

To be in the safer side I never drove my Swift about 100 for the first 1000 kms ( even now I have never did it )
Surprise is offline   Reply With Quote
Old 1st August 2005, 23:13   #9
Join Date: Jun 2005
Location: Bangalore
Posts: 690
Thanked: Once

I have an Alto which I hardly use (2000km) in 7 months. And strangely I get some screeching noise when I start the car for the first time in the day. The noise disappears as soon as the engine has run for a minute or so. The noise is clearly coming from the right side of the engine where the gearbox is located. Is this because the engine has not been broken in properly or is there a problem?
Vivekphadnis is offline   Reply With Quote
Old 1st August 2005, 23:36   #10
Senior - BHPian
Revvmaster's Avatar
Join Date: Feb 2004
Location: Bombay
Posts: 1,181
Thanked: 17 Times

Hi Vivek

My guess is the screeching noise is from the fan-belt. It is common. As you start the engine, when it is cold, the fan-belt screeches for a few moments till the engine reaches a certain temperature and then the noise disappears. I can't technically tell you the reasons, but yes it happens to nearly all cars. Even my 46k Zen VXi has the same issue, but the fan belt doesn't have any signs of wear and tear. Here too the noise disappears after a minute or so.

Revvmaster is offline   Reply With Quote
Old 2nd August 2005, 02:09   #11
Join Date: Jul 2005
Location: bombay
Posts: 5
Thanked: 0 Times

that screeching sound used to come from my indica whenever i used to drive on a wet road...and once i dont know what happened...that sound used to appear whenever the car was in motion...when i stop the sound stops..when i ove the sound starts...people used to know me with that noise...that car so was sad...not even v2...i swear 2 days in a week i used to be on the read standing next to this car which is shut trying to get a mechanic...sold it few months back..it had all kinds of problems..trust me not even a single thing was perfect in that car
lancster is offline   Reply With Quote
Old 2nd August 2005, 09:45   #12
Join Date: Jun 2005
Location: Bangalore
Posts: 690
Thanked: Once

Hi, I got the belts checked twice for tension. The Maruti people say it happens in some cars and that it comes from the gears. I believe it takes time for the oil to reach all parts after the car has been stopped for a long time. But when I start the car and leave it idling, there is no such noise. Only when I press the throttle immediately after starting this happens. If I press the clutch, the noise goes away. Does that mean anything?
Vivekphadnis is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Swift VDi ownership: A Running report GeekSrik Long-Term Ownership Reviews 1157 24th June 2010 18:54
Swift Vxi & Swift Vdi - Ownership/Service/Running costs dcetech Hatchbacks 4 26th October 2009 22:28
AC running query nitin.dangayach Technical Stuff 50 12th July 2009 16:04
Swift : Running -in and engine noise manjubp Technical Stuff 9 10th December 2006 06:11

All times are GMT +5.5. The time now is 01:04.

Copyright 2000 - 2016, Team-BHP.com
Proudly powered by E2E Networks