Mk1 Front Hubs. Need Your Help! - Page 2 - MR2 Owners Club Message Board
 1Likes
Reply
 
LinkBack Thread Tools
post #21 of 166 (permalink) Old August 11th, 2011, 10:41
Gold Level
 
Join Date: Mar 2004
Location: Medford, NJ
Age: 60
Posts: 3,509
OldTrader Rating: (10)
Tommy, this is where AJ is saying there isn't enough material to turn down the OD

http://carpron.com/multisite/v/Uploa...+axle.jpg.html

Maybe if you welded a plug into the Xtra large holes, then turned them down, you'd solve both problems (availability and the weakening by the holes)

Last edited by PDoane; August 11th, 2011 at 10:43.
PDoane is offline  
Sponsored Links
Advertisement
 
post #22 of 166 (permalink) Old August 11th, 2011, 10:49
Registered User
 
tommyg's Avatar
 
Join Date: Mar 2004
Location: Baie D'Urfe, Quebec, Canada
Posts: 1,147
OldTrader Rating: (9)
I see, thanks Peter!
I still wonder if the MK1b had larger hubs (like FX16) than the Mk1a

Having said that, in my case, since I'm using a 2 pc disc with aluminum center hats, I may already have enough clearance for a slightly larger hub, or, can make up larger center hats.
I just need the diameter of those FX16 hubs
tommyg is offline  
post #23 of 166 (permalink) Old August 11th, 2011, 15:07 Thread Starter
Registered User
 
Join Date: Nov 2008
Location: Silver Spring, MD
Age: 68
Posts: 532
OldTrader Rating: (0)
Thanks, Peter. TommyG, the Corolla hubs were a half inch wider than the MR2 fronts, but I couldn't get an accurate measurement since it was returned. My mechanic said that there was not much meat for machining, certainly not 1/4" all the way around. Still researching.
AJ
ajmr2 is offline  
Sponsored Links
Advertisement
 
post #24 of 166 (permalink) Old August 11th, 2011, 15:34
Registered User
 
tommyg's Avatar
 
Join Date: Mar 2004
Location: Baie D'Urfe, Quebec, Canada
Posts: 1,147
OldTrader Rating: (9)
Thanks AJ, but I don't know the size of a Mk1a hub, and whether its smaller than a Mk1b, so basically its back to square 1
tommyg is offline  
post #25 of 166 (permalink) Old August 12th, 2011, 05:27
Gold Level
 
Join Date: Mar 2004
Location: Medford, NJ
Age: 60
Posts: 3,509
OldTrader Rating: (10)
The '85 hub (last one that broke on me) here in my office is 4-7/8" in diameter
PDoane is offline  
post #26 of 166 (permalink) Old August 12th, 2011, 07:47 Thread Starter
Registered User
 
Join Date: Nov 2008
Location: Silver Spring, MD
Age: 68
Posts: 532
OldTrader Rating: (0)
My broken hub, which fit my '89 is the same, 4 -7/8" OD. The wheel centering hub is 2 -1/16" OD. I'm not sure where/what the difference in MK1a & MK1b is. For now I'm leaving the used backup hub on the car and hoping to make it through the Labor Day MARRS races at Summit Point, then I'll get back on hunting down replacements. Anyone with a supplier please come forward with the info. Advanced Auto Parts, Pep Boys, your local Mom & Pop, whatever. There's got to be someone somewhere with a bunch of these things.
Thanks.
AJ

Toyota MR2 front hub assembly.
Toyota part number is 43502-17010
ajmr2 is offline  
post #27 of 166 (permalink) Old August 12th, 2011, 11:20
Registered User
 
tommyg's Avatar
 
Join Date: Mar 2004
Location: Baie D'Urfe, Quebec, Canada
Posts: 1,147
OldTrader Rating: (9)
it seems they're both the same...I wasn't sure if the brake differences between mk1 a and b extended to the hubs. Thanks for the info.
Oh well...just hate running out of spares
tommyg is offline  
post #28 of 166 (permalink) Old August 17th, 2011, 19:45
Registered User
 
Join Date: Aug 2006
Location: orlando
Age: 37
Posts: 1,277
OldTrader Rating: (3)
How often are you guys breaking hubs? so far no hub failures, except when a bearing failure ground into the hub.
quadzjr is offline  
post #29 of 166 (permalink) Old September 9th, 2011, 16:12
Registered User
 
Join Date: Sep 2009
Age: 60
Posts: 20
OldTrader Rating: (0)
Mk1 Front Hubs, Need Your Help!

I've broken two hubs when we used to run our MR2 in ITA. I believe that the hub that is affected depends on the direction of the track. In both cases we broke the passenger side hub on CCW tracks.

When converting the car to Super Production trim on slicks, I had new hubs made up by my local machinist out of 4340. The hub flange is ~ .125" thicker than stock. However this was not dictated by a strength consideration but where I wanted the rotor to be in the custom brake setup. Total shop time was ~ 6 hours for both hubs.





tiger82 is offline  
post #30 of 166 (permalink) Old September 9th, 2011, 16:42 Thread Starter
Registered User
 
Join Date: Nov 2008
Location: Silver Spring, MD
Age: 68
Posts: 532
OldTrader Rating: (0)
Beautiful. A work of art. And look! NO ACCESS HOLES! Too bad they're illegal in IT or I'd be all over it. Steve B & I are buying/sharing a freaking parts car with 25+ year old hubs so we have a few spares. Just doesn't seem right. So, if I may ask, what did you have to pay for the pair? We might have to pursue this option (with stock thickness, of course) if I could get it approved by National. Yeah, right!
AJ
ajmr2 is offline  
post #31 of 166 (permalink) Old September 9th, 2011, 17:02
Registered User
 
tommyg's Avatar
 
Join Date: Mar 2004
Location: Baie D'Urfe, Quebec, Canada
Posts: 1,147
OldTrader Rating: (9)
I'd consider them as well...
tommyg is offline  
post #32 of 166 (permalink) Old September 10th, 2011, 08:45
Gold Level
 
Join Date: Mar 2004
Location: Medford, NJ
Age: 60
Posts: 3,509
OldTrader Rating: (10)
What I'm not sure of is whether a billet item (machined from one piece of steel) will be as strong as the OEM (as weak as it is). The OEM piece may be forged, then machined down.

One of the MKI guys on our email thread about this says the OEM pieces may be welded some how (I assume because of the blueish hue to the inside-inner part of the flange). I feel that is from machining. There are no weld beads on this part that I can see.
PDoane is offline  
post #33 of 166 (permalink) Old September 12th, 2011, 00:26
Registered User
 
Join Date: Sep 2008
Location: Olympia WA
Age: 42
Posts: 1,802
OldTrader Rating: (52)
Quote:
Originally Posted by tommyg
I'd consider them as well...
+1
tom1977 is offline  
post #34 of 166 (permalink) Old September 12th, 2011, 02:17
Registered User
 
Join Date: Jun 2006
Location: Savannah, Ga.
Age: 72
Posts: 221
OldTrader Rating: (1)
Mk1 Front Hubs

I would be very interested in a front pair. I just need a price!!
racermr2 is offline  
post #35 of 166 (permalink) Old September 12th, 2011, 06:48
Registered User
 
Join Date: Mar 2004
Location: Aurora, CO
Age: 59
Posts: 3,204
OldTrader Rating: (6)
me also


Davegt27
davegt27 is offline  
post #36 of 166 (permalink) Old September 12th, 2011, 09:39
Registered User
 
Join Date: Jun 2006
Age: 31
Posts: 347
OldTrader Rating: (1)
Quote:
One of the MKI guys on our email thread about this says the OEM pieces may be welded some how (I assume because of the blueish hue to the inside-inner part of the flange). I feel that is from machining. There are no weld beads on this part that I can see.
That blue hue is ether heat treating or over heating from brakes. if they are brand new and are blueish in color they are heat treated.

now the billet one comes down to if the steel they started with is as strong as the hared factory piece.
dustman_7 is offline  
post #37 of 166 (permalink) Old September 13th, 2011, 06:10
Gold Level
 
Join Date: Mar 2004
Location: Medford, NJ
Age: 60
Posts: 3,509
OldTrader Rating: (10)
Only blueish at one point/circumferential stripe on the inner flange surface, right where the machining starts/stops. I will try to get a picture.
PDoane is offline  
post #38 of 166 (permalink) Old September 13th, 2011, 23:06
Registered User
 
Join Date: Sep 2009
Age: 60
Posts: 20
OldTrader Rating: (0)
I think one of the problems we are also dealing with is fatigue failure. Some of the parts are getting to the age where they have undergone many millions of cycles. This will be an even worse problem in the future if it is true that new pieces are no longer being sold.

I have to agree with PDoane in that a new custom piece of identical dimensions to a factory unit is not necessarily going to be stronger. I was able to make mine stronger largely because of the thicker flange - which is not an option for those with stock brakes.

BTW, the units I had made were for personal use only - I'm not trying to sell them. If you're interested, PM me and I will put you in touch directly with the machine shop that made them.
tiger82 is offline  
post #39 of 166 (permalink) Old September 15th, 2011, 22:01
Registered User
 
Join Date: Jun 2006
Location: Savannah, Ga.
Age: 72
Posts: 221
OldTrader Rating: (1)
AJMR2: If I thought there was enough interest I can have a machinist with CNC capability machine those out of good material(4340) and heat treated to 45 on the "C" scale. Then they won't break. Only draw back is I need 15 sets to get a decent price with a 50% deposit.
PS: Don't even think about approaching SCCA Nat'l for approval. You will not get it. Find them, make them, use them. How many times have you ever seen a tear down to check front hubs. Your safety is worth more than any rule IMHO. Otherwise, your only alternative is park the MR2, and build/race a Honda or VW. I will race my MR2 no matter what!!
racermr2 is offline  
post #40 of 166 (permalink) Old September 16th, 2011, 06:46
Next Race 4/12/14
 
Join Date: Jun 2004
Location: Frederick MD
Age: 56
Posts: 1,563
OldTrader Rating: (5)
I'd be up for a pair or two if someone organized a production run. And I agree with racermr2... let them protest me (it's not like I ever see the podium). I'm in this for fun and wondering if every vibration I feel is the onset of a broken hub is not fun.

Besides, if we fabricate to OEM dimensions I fail to see why the lack of holes would exclude them from being considered after market replacements. Someone would have a hard time proving the lack of holes as a competitive advantage as we are actually ADDING rotational mass.
steve b is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MR2 Owners Club Message Board forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: (0 members)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome