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-   -   SM Weekend of Failure (wheel hubs) (https://www.miataturbo.net/race-prep-75/sm-weekend-failure-wheel-hubs-90331/)

hi_im_sean 11-22-2016 03:37 PM

Lol, they're perfectly acceptable ball bearings im sure. Being that they are highly polished steel spheres, I don't think it would be a stretch (its fuking obvious) that those are reflections.

MetalMuffins 11-22-2016 03:38 PM


Originally Posted by phocup (Post 1376543)
I wasn't until I saw SADfab BALL SACK. Where's my safety pin ..



So its probably reflection / ect but I'm seeing what looks to be a bunch of little weld spots on each ball ..
As for buying these off ebay .. they're cheap enough to try but what's the chances that' they're as good as / better than OEM ? Maybe there's obvious answers in the listing, but I'm a noob without $150 of tools to QC.

Yea, that's just a reflection. These things tend to happen when you have so many shiny balls crammed together... :naughty:

phocup 11-22-2016 03:39 PM

Hah, it does say "Deep Groove" so I thought perhaps they're not normal perfectly spherical bearings. As I said, noob to this stuff.

z31maniac 11-22-2016 04:45 PM


Originally Posted by phocup (Post 1376543)
Have you been able to go back out with the replacement hub ? Curious as to how that held up.

No that was a few years ago, and the engine was down on power and pissing oil everywhere so that car got parted after it ate the 3rd engine.

phocup 11-26-2016 01:12 AM

New balls came today. Bought from the seller that Shuiend linked. The exact ones I bought are these, unfortunately either stock are not 13/32 or the ones I was sent were not.

I knew it right when I popped the first new bearing into the plastic retainer. It fell out whereas the old bearing remained in place. Will head to Harbor Freight tomorrow to get some calipers so I can determine the size I was sent. Hopefully can return.

Here's a pic to show the difference. 10 OEM balls on top. 10 eBay 13/32 balls on the bottom.

https://cimg6.ibsrv.net/gimg/www.mia...ca1ab7ab0f.jpg


Night wasn't a complete bust though, the repacked hub with CV2 was pretty smooth. Can't wait to test it out in the car tomorrow.

shuiend 11-26-2016 01:35 PM


Originally Posted by phocup (Post 1377211)
New balls came today. Bought from the seller that Shuiend linked. The exact ones I bought are these, unfortunately either stock are not 13/32 or the ones I was sent were not.

I knew it right when I popped the first new bearing into the plastic retainer. It fell out whereas the old bearing remained in place. Will head to Harbor Freight tomorrow to get some calipers so I can determine the size I was sent. Hopefully can return.

Here's a pic to show the difference. 10 OEM balls on top. 10 eBay 13/32 balls on the bottom.

https://cimg6.ibsrv.net/gimg/www.mia...ca1ab7ab0f.jpg


Night wasn't a complete bust though, the repacked hub with CV2 was pretty smooth. Can't wait to test it out in the car tomorrow.


I will say I bought the balls completely based on some measurements I saw on here. It is very possible that I bought the wrong size originally. I have yet to repack bearings so I have yet to actually measure them myself.

hi_im_sean 11-26-2016 02:19 PM

Im gonna go measure a ball for yall

hi_im_sean 11-26-2016 04:10 PM

This mic reads about 3-4 tenths big. So pretty much dead on 13/32".

https://cimg7.ibsrv.net/gimg/www.mia...438af9aa33.jpg


Taken from the inside race of a timken hub.
http://i222.photobucket.com/albums/d...psc1fotcpl.jpg

EO2K 11-26-2016 04:26 PM

The assumption here is of course that all hubs by all manufacturers all use the same bearings ;)

phocup 11-26-2016 05:07 PM


Originally Posted by shuiend (Post 1377275)
I will say I bought the balls completely based on some measurements I saw on here. It is very possible that I bought the wrong size.

It happens, I did the same thing without due diligence and double checking .. :rofl:

Thanks for measuring that off Sean. I guess your Timken is 13/32. Now that I think about it, there's no guarantee that even different year OEM have same bearing size. Definitely measure your own before buying if going this route. Unfortunately this will add to downtime in many cases as most won't have spare hubs.

hi_im_sean 11-26-2016 05:55 PM


Originally Posted by EO2K (Post 1377321)
The assumption here is of course that all hubs by all manufacturers all use the same bearings ;)


That is correct, Gordon.

Midtenn 11-29-2016 01:16 PM

Some hubs don't even use the same number of balls. Some of the earlier cars used 11 or 12 balls per race. They are apparently gold to SM players.

hornetball 11-29-2016 02:39 PM


Originally Posted by hornetball (Post 1361041)
So far so good on my Mazdaspeed HDs. 1 track day at MSR-C (1.7CCW) and 2 at Hallett (1 CW and 1 CCW).

Lost a Mazdaspeed HD. It lasted a total of 11 track days (about 20 hours). So, no advantage there that I can discern. I slapped on a repacked China hub with OK machining.

Lincoln Logs 11-29-2016 02:41 PM


Originally Posted by hornetball (Post 1377868)
Lost a Mazdaspeed HD. It lasted a total of 11 track days (about 20 hours). So, no advantage there that I can discern. I slapped on a repacked China hub with OK machining.

Given how long these hubs last I've given up on the idea of repacking. I just going to for the best quality I can within reason and running them until they go (I always keep two spares with me).

hornetball 11-29-2016 02:48 PM


Originally Posted by Lincoln Logs (Post 1377869)
Given how long these hubs last I've given up on the idea of repacking. I just going to for the best quality I can within reason and running them until they go (I always keep two spares with me).

If I don't see a significant durability increase out of the one I just slapped on (I don't have high hopes), I will do exactly the same. I'm really fast at swapping hubs these days.

Lincoln Logs 11-29-2016 02:50 PM


Originally Posted by hornetball (Post 1377872)
If I don't see a significant durability increase out of the one I just slapped on (I don't have high hopes), I will do exactly the same. I'm really fast at swapping hubs these days.

Yup, I can swap a hub in much less time than the time it would take me to repack...also less messy too.

HHammerly 01-16-2017 06:37 PM

I made a tool to re-pack my front hubs , it rakes about 3 minutes to pump some fresh grease between track days, is anyone interested in one? My cost is $75 a picece when having 10 made.
i will make a batch if there are takers.
https://cimg2.ibsrv.net/gimg/www.mia...6751799df1.jpg
https://cimg4.ibsrv.net/gimg/www.mia...f0a58ec3d0.jpg

aidandj 01-16-2017 06:40 PM

How does it work? Definitely interested.

HHammerly 01-16-2017 06:54 PM

You isert the tool from the wheel side and it provides a seal between the front of the hub and the back bearing inner bore forcing the grease through the balls and races, all the old grease comes out the upright side, i was not about to disassemble the bearings every time i re pack them. Let me see if this link works

sixshooter 01-16-2017 09:26 PM

1 Attachment(s)
Kinda like this?


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