 Tires spinning on the rim ..., How much of a problem is this? |
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| SirAndy |
  Apr 27 2009, 10:55 AM
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#1
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Resident German  Group: Admin Posts: 41,954 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California  |
I always mark the race tires right where the valve stem is so i don't have to look for the stem when i'm in a hurry.
We put a new set of tires on the 911 one week ago at Tunderhill and this weekend i noticed that the markings had moved several inches in relationship to the valve stem. So i marked the stem location again with a small dot and sure enough, after the first run session, the tires had moved again by several inches. This only seems to happen in the rear, i'm guessing under hard acceleration when the tires are cold (first session in the morning). Is this something that needs to be addressed or should i not worry about it? (IMG:style_emoticons/default/confused24.gif) Andy |
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| 6freak |
Apr 27 2009, 11:02 AM
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#2
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
Im not a pro but I know that would not sit right with me .....maybe under inflated?Maybe dismount them and rough up the beeds on the wheels? maybe theres rubber built up on that beeds causeing slippage ??...I would say somethings not right ...JMO
Mike |
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| jmill |
Apr 27 2009, 11:03 AM
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#3
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
I've seen it on drag cars. Most screw the tires to the rim. It will mess up your tire balance when it moves. On a race car I'd get it looked at. You don't want to throw a tire at high speeds because it's way out of balance.
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| jt914-6 |
Apr 27 2009, 11:12 AM
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#4
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Driving & working on teeners 41 years Group: Members Posts: 1,786 Joined: 3-May 08 From: Bryant, Arkansas Member No.: 9,003 Region Association: South East States |
That was my first thought too.....it would throw off the balance of the wheel/tire.
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| anderssj |
Apr 27 2009, 11:28 AM
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#5
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Dog is my copilot... Group: Members Posts: 1,715 Joined: 28-January 03 From: VA Member No.: 207 Region Association: MidAtlantic Region 
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QUOTE(SirAndy @ Apr 27 2009, 12:55 PM)  I always mark the race tires right where the valve stem is so i don't have to look for the stem when i'm in a hurry. We put a new set of tires on the 911 one week ago at Tunderhill and this weekend i noticed that the markings had moved several inches in relationship to the valve stem. So i marked the stem location again with a small dot and sure enough, after the first run session, the tires had moved again by several inches. This only seems to happen in the rear, i'm guessing under hard acceleration when the tires are cold (first session in the morning). Is this something that needs to be addressed or should i not worry about it? (IMG:style_emoticons/default/confused24.gif) Andy Andy, It will change/throw off the balance--the bigger the movement, the greater the change . . . . What did they use for a lubricant when they installed the new tires onto the rims? Some of the shops here had been using armor-all or other sil-based stuff that doesn't evaporate, and we'd see the tires rotate around the rim (usually on the front end--i guess due to FWD and braking forces). Best, Steve A- |
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| McMark |
Apr 27 2009, 11:32 AM
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#6
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Wow. You have too much horsepower. (IMG:style_emoticons/default/av-943.gif)
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| Brett W |
Apr 27 2009, 02:54 PM
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#7
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None
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Is this on your street car or just an autox car? If dedicated autox car, I wouldn't even bother balancing them, much less worry about the slipping.
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| r_towle |
Apr 27 2009, 04:15 PM
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#8
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Custom Member Group: Members Posts: 24,679 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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What 911?
News??? Rich |
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| Krieger |
Apr 27 2009, 09:02 PM
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#9
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Advanced Member Group: Members Posts: 4,771 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I see two possible solutions to this problem, you need to unplug a couple of spark plug wires or use less lube.
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| championgt1 |
Apr 27 2009, 09:10 PM
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#10
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Don't embarrass me Filmore! Group: Members Posts: 2,680 Joined: 3-January 07 From: Tacoma, Washington Member No.: 7,420 Region Association: Pacific Northwest |
QUOTE(r_towle @ Apr 27 2009, 03:15 PM) What 911? News??? Rich Andy, you still running this car?  |
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| 736conver |
Apr 27 2009, 09:20 PM
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#11
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Advanced Member Group: Members Posts: 2,117 Joined: 25-May 03 From: SE Wisconsin Member No.: 736 Region Association: None |
I'm guessing too much lube putting the tires on or the wrong type of lube.
You did just put the tires on. What was used? How much was used? |
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| SirAndy |
Apr 27 2009, 10:30 PM
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#12
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Resident German Group: Admin Posts: 41,954 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Brett W @ Apr 27 2009, 01:54 PM) Is this on your street car or just an autox car? If dedicated autox car, I wouldn't even bother balancing them, much less worry about the slipping. Toyo Spec 911 race car, GTS class with PRC, SP911 class with PCA. No Street, no AX, just *big* track ... 3.0L with aftermarket FI. About ~270 HP at the rear wheels. 245 x 16 Toyo RA1 tires in the rear. (IMG:style_emoticons/default/shades.gif) Andy PS: I have no idea what lube or how much of it they used when they mounted the tires. I didn't stick around to watch them put them on, just picked 'em up later ... Attached thumbnail(s) 
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| Brett W |
Apr 28 2009, 06:59 AM
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#13
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None
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Traitor.
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| 6freak |
Apr 28 2009, 08:18 AM
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#14
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MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
QUOTE(championgt1 @ Apr 27 2009, 08:10 PM) QUOTE(r_towle @ Apr 27 2009, 03:15 PM) What 911? News??? Rich Andy, you still running this car? Portland is one of my favorite tracks . (IMG:style_emoticons/default/driving.gif) ....I love that track |
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| anderssj |
Apr 28 2009, 09:10 AM
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#15
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Dog is my copilot... Group: Members Posts: 1,715 Joined: 28-January 03 From: VA Member No.: 207 Region Association: MidAtlantic Region
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QUOTE(SirAndy @ Apr 28 2009, 12:30 AM) No Street, no AX, just *big* track ... 3.0L with aftermarket FI. About ~270 HP at the rear wheels. 245 x 16 Toyo RA1 tires in the rear. (IMG:style_emoticons/default/shades.gif) Andy PS: I have no idea what lube or how much of it they used when they mounted the tires. I didn't stick around to watch them put them on, just picked 'em up later ... Andy, I copied this from a Michelin Technical Bulletin: LUBRICANT FOR MICHELIN TRUCK TIRES (Revised 15 MAY 2006): "It is essential that only an approved tire mounting lubricant be used when mounting Michelin® Truck Tires. Vegetable oil soaps or animal oil soaps, in solution, are the preferred materials for use as bead lubricants. Never use antifreeze, gasoline, ether, silicones, or any petroleum based lubricants. Never dilute lubricants beyond that recommended by the manufacturer since this may have a harmful effect on the tire and wheel/rim. The lubricant serves three purposes: • Helps minimize the possibility of damage to the tire beads from the wheel or mounting tools. • Helps ease the introduction of the tire onto the wheel/rim by lubricating all contacting surfaces. • Assists in proper bead seating and helps to prevent eccentric mounting. It is important that the tire lubricant be kept clean and free of dirt, sand, metal shavings or other hard particles. Tubeless Tires: We recommend lubricating both beads on the tire and the entire wheel surface from flange to flange. The tire must be mounted and inflated before the lubricant dries. Avoid using excessive amounts of lubricants. (Puddling of the lubricant inside the tire is considered excessive.)" (IMG:style_emoticons/default/blink.gif) I've had good luck using 3 or 4 oz of "Murphy's Oil Soap" in a quart (32oz) of warm water--and usually allow a day--or two--for everything to dry before putting any high braking/acceleration forces on the tires (as always, YMMV). Hope this helps! |
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| So.Cal.914 |
Apr 28 2009, 09:17 AM
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#16
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
I like the color.
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