Flywheel Weight Reduction / Lightened Flywheels

v1p3r · 6th April 2007, 03:13

Quote:

Originally Posted by ananthkamath

I thought it just needs a lathe, a calculator and a weighing scale. LOL just kidding.

Lathe? Calculator? Weighing scale? Just use a hacksaw and hack off whatever you don't like!

viper · 6th April 2007, 08:34

Quote:

Originally Posted by v1p3r

Lathe? Calculator? Weighing scale? Just use a hacksaw and hack off whatever you don't like!

Lol,

And end up with a busted flywheel and clutch plate.

@ Manveet - Bro simple genuine advice. Avoid it you will be happier.

Viper

Harrie · 6th April 2007, 08:59

Quote:

Originally Posted by ananthkamath

I thought it just needs a lathe, a calculator and a weighing scale. LOL just kidding.

The flywheel has to be dynamically balanced. At 7000 rpm a 2 grams out of balance will be equal to 5 Kgs (Well not exactly but you get the picture... )

manveet · 6th April 2007, 09:31

Quote:

Originally Posted by v1p3r

Lathe? Calculator? Weighing scale? Just use a hacksaw and hack off whatever you don't like!

Or perhaps one could drill a few holes here and there .. damn, where did i keep that drill machine of mine

jokes apart - the above info has helped, i may have a few more queries with which i'll probably get back later .. need to rush out now ..

p.s.
@viper - not planning to get it done - just trying to understand the funda.

Bass&Trouble · 6th April 2007, 10:57

Quote:

Originally Posted by rishibravo

Our car engine makes the least torque at idle and low RPM, especially when cold (when there are more misfires.).... So when you release your clutch a little too fast, the engine torque is too small to overcome the inertia of the car, and it stalls. Thats where the flywheel comes to action ...

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I think getting a lighter flywheel is not advisable for city driving. But if you want to burn the track then you can go for it .Still you have to be careful when you are shedding some weight of the flywheel ,it should be just right

Very well explained. Are you a mechanical engineer or something?

manson · 6th April 2007, 11:20

Quote:

Originally Posted by v1p3r

Lathe? Calculator? Weighing scale? Just use a hacksaw and hack off whatever you don't like!

whatever you use, lathe, hacksaw, shaping, shearing, etc just buy one from me

!!

manson.

k36 · 6th April 2007, 13:41

So it seems a heavy flywheel helps drivability in city traffic.
Would this help a car with weak low end torque? (e.g. Swift Petrol)
How about having a heavy city-specific flywheel and the OE flywheel for highway use? How difficult is it to attach and detach a flywheel?

rishibravo · 6th April 2007, 13:51

Quote:

Originally Posted by Bass&Trouble

Very well explained. Are you a mechanical engineer or something?

He He He....No not a mechanical Engineer but did a few Applied mechanics courses during my B-Tech days...And there goes my 100th post

.

rishibravo · 6th April 2007, 13:56

Quote:

Originally Posted by k36

So it seems a heavy flywheel helps drivability in city traffic.
Would this help a car with weak low end torque? (e.g. Swift Petrol)
How about having a heavy city-specific flywheel and the OE flywheel for highway use? How difficult is it to attach and detach a flywheel?

If you have your own garage then you can go for it . I would still say dont do it as it will be too much of a hastle.

nitroxx · 9th April 2007, 02:54

a lightened flywheel on an N.A. car would drop low end torque..but improve mid range so unless you've had a few mods done i wouldnt suggest a lightened one.

manveet · 30th May 2007, 14:16

So suppose one wants to lighten the bottom-end of the car .. say from crank to wheel - what all could be worked upon, apart from the flywheel?

I've also heard of Tuners replacing the OE Pulley with lighter Alloy ones - is this correct? How many such Pulleys are there?

Can someone explain using a few pics or provide a linky perhaps?

elf · 30th May 2007, 17:35

Yes, what would the advantage of lightened pulleys be over a shaved flywheel?

manveet · 30th May 2007, 18:14

Quote:

Originally Posted by elf

Yes, what would the advantage of lightened pulleys be over a shaved flywheel?

I could be wrong Elf, but I don't think that people get the pulleys replaced without lightening the flywheel as well. IMO, as per common sense the complete bottom-end should be done together as a system i.e. flywheel, pulleys etc.

p.s.
long time buddy .. missed you

elf · 30th May 2007, 18:25

Quote:

Originally Posted by manveet

... I could be wrong Elf ...

You are. You always are. That's the basic tenet of life.

Quote:

Originally Posted by manveet

... but I don't think that people get the pulleys replaced without lightening the flywheel as well. IMO, as per common sense the complete bottom-end should be done together as a system i.e. flywheel, pulleys etc. ...

I've heard of people replacing only the pulleys directly without shaving the flywheel. Personally, I'd like to do so myself - less headache.
Besides, I like hairy, macho flywheels. They're so smooth.

Quote:

Originally Posted by manveet

... long time buddy .. missed you

Sniff. Sniff. Hug. Hug. Kiss. Kiss. Sob. I missed you too. What to do... I was (**ahem**) 'away' & 'unavailable' for a week.

sbasak · 30th May 2007, 18:44

The auto engine manufactures are doing these calculations every time they design an engine. There are several parameters involved. The flywheel mass and weight comes from an optimum use point of view. How big and small one can go requires detail calculation engine operations. However, following links should be useful understanding what can happen in general.
Lightweight Flywheel - Pros and Cons | Kapital Moto
Why (or Why Not) to Lighten Your Flywheel
Lightened Flywheels

6th April 2007, 13:41	#22
k36 BHPian Join Date: Dec 2005 Location: Pune Posts: 133 Thanked: 21 Times	So it seems a heavy flywheel helps drivability in city traffic. Would this help a car with weak low end torque? (e.g. Swift Petrol) How about having a heavy city-specific flywheel and the OE flywheel for highway use? How difficult is it to attach and detach a flywheel?
	() Thanks

9th April 2007, 02:54	#25
nitroxx Awaiting Email Confirmation Join Date: Nov 2004 Location: DXB Posts: 816 Thanked: 31 Times View My Garage	a lightened flywheel on an N.A. car would drop low end torque..but improve mid range so unless you've had a few mods done i wouldnt suggest a lightened one.
	() Thanks

30th May 2007, 14:16	#26
manveet Senior - BHPian Join Date: Jul 2006 Location: New Delhi Posts: 1,094 Thanked: 732 Times View My Garage	So suppose one wants to lighten the bottom-end of the car .. say from crank to wheel - what all could be worked upon, apart from the flywheel? I've also heard of Tuners replacing the OE Pulley with lighter Alloy ones - is this correct? How many such Pulleys are there? Can someone explain using a few pics or provide a linky perhaps?
	() Thanks

30th May 2007, 17:35	#27
elf BANNED Join Date: Jan 2005 Location: Bombay Posts: 1,039 Thanked: 13 Times View My Garage	Yes, what would the advantage of lightened pulleys be over a shaved flywheel?
	() Thanks

30th May 2007, 18:44	#30
sbasak BHPian Join Date: Nov 2005 Location: CCU-LTN Posts: 608 Thanked: 14 Times	The auto engine manufactures are doing these calculations every time they design an engine. There are several parameters involved. The flywheel mass and weight comes from an optimum use point of view. How big and small one can go requires detail calculation engine operations. However, following links should be useful understanding what can happen in general. Lightweight Flywheel - Pros and Cons \| Kapital Moto Why (or Why Not) to Lighten Your Flywheel Lightened Flywheels
	() Thanks