Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> different sized tires on the rear?, had to abandon the 914 at my inlaws tthis evening. :(
VaccaRabite
post Aug 7 2010, 08:45 PM
Post #1


En Garde!
**********

Group: Admin
Posts: 13,444
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
As I continue to fine tune the car getting ready for the 3 hour drive out tot he ECC, I drove it out to my inlaws Thursday night. Spent Friday crabbing, and then was able to spend all day today tuning. Took several test drives that went perfect.

After washing the car, I noticed that one of the tires (drivers rear) had a 4 inch crack in the sidewall. Less then 2000 miles on these tires too. Dammit!

Anyway I changed the tire with my spare. The spare is a larger tire then the rest of the tires, and I was worried that this might cause me a problem. I think that it did.

When I went to go drive out, I started slowly. Rolling in first I heard the car go: "clunka - clunka - clunka" and I stopped. Backed it right back into my parking spot in my father in law's driveway. My wife was there and I got a ride home with her.

So, my question. What made the sound? Was it:
  1. the rear tires were mismatched, I was hearing the differential eating itself?
  2. The spare tire was not centered on the hub properly?
  3. Some other issue I have not yet thought of?
My guess is number 1, which is why I left the car after rolling it forward about 10 or 20 feet and hearing it not sound happy.

I guess, if I had been smart, I would have taken off one of the front tires and put that on the rear so that both drive wheels were the same and the fronts were miss-matched. We did think of trying that before I left it, but I was exhausted and so was my son, so we just left it until I can get back there with a new tire sometime next week.

The tires are mismatched because the full size spare is in the stock size, but my street tires are smaller diameter.

I don't think I did any lasting harm. As I said, it only went a car's length before I stopped it and backed it back into the parking spot.

Thanks
Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 16)
scotty b
post Aug 7 2010, 08:48 PM
Post #2


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None
How fast were you going ? Did the sound increase with the speed ? Spare could have a flat spot (IMG:style_emoticons/default/confused24.gif) Try putting the flat spot at the top and see if it goes away (IMG:style_emoticons/default/rolleyes.gif)

You know what, actually just scrap the damn thing and buy a Miata. They go for forever
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Aug 7 2010, 08:54 PM
Post #3


En Garde!
**********

Group: Admin
Posts: 13,444
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
I was going, maybe, 5mph. Probably less. Went forward 10-20 feet, heard a few "clunks". Backed it up 10-20 feet and heard a few more cluncks and parked it. No way on the Miata. If I wanted a little car that would just drive and not ever need my tinkering I would have bought... well... a Miata.

Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty b
post Aug 7 2010, 08:58 PM
Post #4


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None
I highly doubt what you heard was the diff or anything detrimental. Take a closer look at it tomorrow and mae certain it is centerd, lugs are all tight, check the caliper and make certtain it hasn't loosend up. Check the rim to make certain it isn;t bent, tire is full etc. Gotta be something basic.


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jsayre914
post Aug 7 2010, 09:04 PM
Post #5


Speed Up !!!
****

Group: Members
Posts: 3,188
Joined: 10-February 08
From: Timonium MD 21093
Member No.: 8,696
Region Association: MidAtlantic Region
well, if i remember correctly... your inlaws are in baltimore (IMG:style_emoticons/default/smile.gif) That means you could fix it and pass by the shop. My car will be parked right in front


PHOTO OP (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer3.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
John
post Aug 7 2010, 09:06 PM
Post #6


member? what's a member?
****

Group: Members
Posts: 3,393
Joined: 30-January 04
From: Evansville, IN (SIRPCA)
Member No.: 1,615
Region Association: None
What wheels do you normally run?

What wheel was a spare?

Are these still lug bolts or studs? If they are lug bolts, do you use alloy bolts (the long ones)?

If your spare uses shorter lug bolts (IE STEEL WHEEL), your alloy lug bolts are too long and can cause interference.

My guess is that is what happened.

Otherwise, I would guess that the spare wheel is somehow interfering with something. I doubt it would be a differential.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Aug 7 2010, 09:11 PM
Post #7


En Garde!
**********

Group: Admin
Posts: 13,444
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
My wheels are 4 bolt fuchs.
My spare is on a steel wheel.
I was using the stock lug bolts, and they seemed to tighten up nicely.

Sorry joe, the car is at Erin's folk's place out neat Westminster, Md. And I have to go visit my mom in the hospital tomorrow, so It will have to stay there probably until next weekend. (IMG:style_emoticons/default/sad.gif)

Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty b
post Aug 7 2010, 09:13 PM
Post #8


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None
QUOTE(Vacca Rabite @ Aug 7 2010, 07:11 PM) *

My wheels are 4 bolt fuchs.
My spare is on a steel wheel.
I was using the stock lug bolts, and they seemed to tighten up nicely.

Sorry joe, the car is at Erin's folk's place out neat Westminster, Md. And I have to go visit my mom in the hospital tomorrow, so It will have to stay there probably until next weekend. (IMG:style_emoticons/default/sad.gif)

Zach


Stock lugs for a steel wheel or stock lugs for a Fuch ? Big difference. Fuch lugs would interfere inside the drum as John mentioned.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
John
post Aug 7 2010, 09:18 PM
Post #9


member? what's a member?
****

Group: Members
Posts: 3,393
Joined: 30-January 04
From: Evansville, IN (SIRPCA)
Member No.: 1,615
Region Association: None
QUOTE(scotty b @ Aug 7 2010, 07:13 PM) *

QUOTE(Vacca Rabite @ Aug 7 2010, 07:11 PM) *

My wheels are 4 bolt fuchs.
My spare is on a steel wheel.
I was using the stock lug bolts, and they seemed to tighten up nicely.

Sorry joe, the car is at Erin's folk's place out neat Westminster, Md. And I have to go visit my mom in the hospital tomorrow, so It will have to stay there probably until next weekend. (IMG:style_emoticons/default/sad.gif)

Zach


Stock lugs for a steel wheel or stock lugs for a Fuch ? Big difference. Fuch lugs would interfere inside the drum as John mentioned.



Now that was a funny pic.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rick 918-S
post Aug 8 2010, 07:42 AM
Post #10


Hey nice rack! -Celette
***************

Group: Members
Posts: 20,460
Joined: 30-December 02
From: Now in Superior WI
Member No.: 43
Region Association: Northstar Region
I was going to say CV joint until I read that you are using long fuchs bolts on a steel wheel. Put your stock tire back on and try it again. Bettcha no noise.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Aug 8 2010, 08:00 AM
Post #11


Jerry
*****

Group: Members
Posts: 6,978
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
QUOTE(Vacca Rabite @ Aug 7 2010, 10:45 PM) *
  1. the rear tires were mismatched, I was hearing the differential eating itself?


Do you normally hear the clunking when rounding corners? This would be the same as having 2 different wheel sizes.

Long lugs on a steel wheel could cause the noise. I have the same setup so I'll check for that when I get my car running. (IMG:style_emoticons/default/chair.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Aug 8 2010, 08:37 AM
Post #12


En Garde!
**********

Group: Admin
Posts: 13,444
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
Okay, good thing to know!
I need to get some different lug bolts for the spare tire.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jim_hoyland
post Aug 8 2010, 08:46 AM
Post #13


Get that VIN ?
*****

Group: Members
Posts: 9,301
Joined: 1-May 03
From: Sunset Beach, CA
Member No.: 643
Region Association: Southern California
QUOTE(Vacca Rabite @ Aug 8 2010, 07:37 AM) *

Okay, good thing to know!
I need to get some different lug bolts for the spare tire.


I carried a 1/4 wheel spacer when i had 4 lug Fuchs and a steel spare. Easy to carry and fits onto the spare anyway....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty b
post Aug 8 2010, 06:33 PM
Post #14


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None
QUOTE(Vacca Rabite @ Aug 8 2010, 06:37 AM) *

Okay, good thing to know!
I need to get some different lug bolts for the spare tire.



DEERRRRRRRRRRR


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tradisrad
post Aug 8 2010, 07:13 PM
Post #15


Senior Member
***

Group: Members
Posts: 985
Joined: 11-September 06
From: San Mateo, CA
Member No.: 6,815
Region Association: Northern California
My first thought was lugs not being tight, but then found that you used the longs bolts on the steel rim and I agree with the others about this being your problem. The bolts probably bottomed out.
I carry a set of short lugs in the event I need to put my spare tire on.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
maf914
post Aug 9 2010, 11:27 AM
Post #16


Not a Guru!
****

Group: Members
Posts: 3,049
Joined: 30-April 03
From: Central Florida
Member No.: 632
Region Association: None
If the lug bolts are too long they will go through the disc and hub and possibly interfere with the backing plate (splash plate). That might be where the clicking is occurring. (IMG:style_emoticons/default/idea.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aircooledtechguy
post Aug 9 2010, 02:14 PM
Post #17


The Aircooledtech Guy
***

Group: Members
Posts: 1,966
Joined: 8-November 08
From: Anacortes, WA
Member No.: 9,730
Region Association: Pacific Northwest
Too long of bolts for a steel wheel; definitely. Take it from me, ( who grenaded a differential in my '66 bus by running mis-matched tired on the rear) it takes a lot of miles at freeway speeds to do the damage that way. I drove that tranny for 3 months daily before the diff went south. It went south pretty quick though once it began. (IMG:style_emoticons/default/headbang.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 17th May 2024 - 06:19 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...