The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

95 Bulletin Board
1999-2009 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main 95 Bulletin Board | BBFAQ | Prev by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
NEW wheel balancing technique; should cure vibrations
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by magalar [Email] (#1325) [Profile/Gallery] (more from magalar) on Mon, 25 Jul 2005 09:06:06 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

With regards to the vibration problem, I may have a potential solution devised by my actual employer, Renault.

A little history:

The flagship Renault Vel Satis (with tall wheels) is having the same kind of small vibrations we are experiencing with our 9-5s. 120 km/h and up, some cars are "humming" slightly, even with new, professionnaly balanced tires. The "real" problem lies in the design of the car itself, which is more prone to even the smallest "out of balance" from the wheels. Give this to the compliances in the bushings, articulations and the likes, usually designed to absorb theses vibrations.

In fact, the root cause of the vibration is in the wheel to hub mounting area: as in all mechanical assemblies, there is a very small play between the wheel centering hole and the hub centering cylinder. At Renault, the wheel hole is 60.1mm and the hub is 60mm. This very small difference is the culprit for the vibrations. The wheel is never perfectly centered on the hub, therefore is vibrates at higher speeds.

Their solution ? Reproduce (on the balancing machine) the same "play" between the wheel bore and the hub found on the car.


Here is a resumé of their procedure, including some standard balancing procedures:

1- Ride the car for at least 2 km and then jack her up immediately;
2- realease hand brake and put gear lever in neutral;
3- rotate the wheels and position all the valves at 12 o'clock (as a visual reference);
4- remove all the stones (if any) in the tread sculptures;
5- remove the wheels;
6- install the wheels on the balancing machine WITH THE VALVES AT 12 O'CLOCK...
7- ...THEN and only then, tighten the wheels on the balancing machine
8- balance the wheels using the FINE balancing procedure;
9- Wheels must be balanced to within 5 g dynamic and 10 g static, no more;
10- carefully clean the mounting surfaces, both wheel and hub.
11- reinstall the wheels on the vehicle WITH THE VALVES AT 12'O clock;
12- pre-torque the wheel bolts to 25 lbs-ft, begining with the 2 lower bolts, then the 3 upper bolts (note, this is not the standard "star" pattern);
13- rotate the wheels 180 degrees to place the valve at 6 o'clock;
14- lower the vehicle on its wheels;
15- finally, torque to the appropriate value which is 100 lbs-ft for 14 mm fasteners;
16- Road test the vehicle to confirm the results.

With that procedure, the play between the hub and the wheel bore will be accounted on the balancing machine. If the wheel is reinstalled on the car with the play in the same location, balance should be perfect.

So anyone want to try this procedure soon ?

I, for one, will apply it to my next tire changes, just because it can't hurt.

Comments welcome.

magalar


posted by 63.174.2...
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!