E46Fanatics

E46Fanatics (http://forum.e46fanatics.com/index.php)
-   General E46 Forum (http://forum.e46fanatics.com/forumdisplay.php?f=4)
-   -   Quick questions bout LTW flywheel..thanks! (http://forum.e46fanatics.com/showthread.php?t=3182)

trybaljedi 04-29-2002 12:18 AM

Quick questions bout LTW flywheel..thanks!
 
1) can a ltw flywheel introduce premature clutch-wear? or am I offbase.

2) does it affect how you engage/disengage the clutch? like speed etc.

Sorry if Im a bit ambiguous.

Matt M. 04-29-2002 12:27 AM

Hi Roshan,

1. No.

2. Not if done correctly.... by that I mean that stock clutch take-up position can be retained as long as the throwout bearing dimensions are correct for the new flywheel. With regard to vehicle speed, an excessively light flywheel could induce stalling if you didn't slip the clutch to higher RPM. Excessively light for an M52TU or M54 is probably just below 10lbs. By staying above that weight, the only changes in RPM characteristics relative to performance and driveability will be desireable, not annoying :D

- -Matt

trybaljedi 04-29-2002 12:59 AM

hmm..

1) slippng the clutch at a higher RPM

- Im a bit confused lightening the flywheel increases rotational speed correct?

- I imagine that dramatically reducing the weight of the flywheel would make you go through RPMs quick, correct?

- Does lightening the flywheel reduce drivetrain loss in say dynoing or normal driving.

- errr does this translate to a more torquey feel?

ayyee!
Roshan
---sorry if I sound fuct up, I am.

Keeferno 04-29-2002 02:11 AM

To my knowledge, a lightened flywheel would not affect the rotational speed, just how fast it gets there. Pretty much what is does is make it rev up faster because there is less weight for it to move. It's like how long it would take you to get a bike rolling (by pushing) versus a car in neutral. You can't push the bike any faster than the car but you'll get it to the top speed a lot faster. Okay, this may sound like totally giberish, I was just in the comp lab for the past 12 hours for a project.

emi323i 04-29-2002 09:18 AM

reduces rotational mass... which
 
translates in less energy stored in the flywheel. when you accelerate the mass, you need to perform work, which is basically the energy required to bring the flywheel to a certain rotational speed. this energy is a waste, because it can't be used in any way... it gives it a high rotational momentum, which is basically, why the engine seems so lazy.

Another diasadvantage is that the energy you stored in the flywheel, let's say you're engaging the clutch ... and hm... for some unknown reason you didn't rev match... that energy will transform into ... either heat or a jolt forward... depending how smooth the clutch engagement is... the first is bad. uh... so is the second one.

so get rid of the heavy flywheel.

trkmedic69 04-29-2002 11:05 AM

Quote:

Originally posted by Matt M.
Hi Roshan,

1. No.

2. Not if done correctly.... by that I mean that stock clutch take-up position can be retained as long as the throwout bearing dimensions are correct for the new flywheel. With regard to vehicle speed, an excessively light flywheel could induce stalling if you didn't slip the clutch to higher RPM. Excessively light for an M52TU or M54 is probably just below 10lbs. By staying above that weight, the only changes in RPM characteristics relative to performance and driveability will be desireable, not annoying :D

- -Matt

don't lighweight fly wheels tend to be noiser ("chatter"?) than stock? I heard one story of a person who hated the excessive noise so much they gave up the great gains and returned to stock.... Not sure what brand he had though.


All times are GMT -5. The time now is 11:14 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use