What front hubs to buy - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-12-2012, 02:14 AM   #41
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also for about $100 you can get super-mega-duper high grade ceramic *****. G5 grade is super baller, too.

20pcs 13/32" 10.318mm Ceramic Diff Bearing ***** Si3N4 GRADE 5 G5 | eBay
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Old 09-12-2012, 02:26 AM   #42
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Perhaps no one has tried ceramic bearings?

Racing Ceramic Bearings - Performance Bearing
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Old 09-12-2012, 02:30 AM   #43
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theres some talk in spec miata forum about ceramic bearings but nothing concrete
Spec Miata Community: New Wheel hubs
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Old 09-12-2012, 08:41 AM   #44
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I may go ceramic when i re-do mine this winter. Got to get every advantage I can. Going ceramic would be a great way to drop a couple ounces of UN-sprung and rotating mass. What are you going to do for replacing the races?
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Old 09-12-2012, 06:47 PM   #45
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Well not so much of weight as much as heat. That would help a lot.
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Old 09-12-2012, 06:51 PM   #46
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Quote:
Originally Posted by Leafy View Post
What are you going to do for replacing the races?
Why would I need to replace the races?

As far as I understand, the way the hubs work is that the races are pressed against the ***** by the axle nut - if that makes sense.
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Old 09-12-2012, 07:44 PM   #47
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The races wear as well as the *****. But they dont wear as fast. I guess you can get multiple uses out of them and just replace the whole hub when you feel the races are done for.
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Old 09-12-2012, 07:47 PM   #48
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I'm starting with brand new hubs, these to be exact
90-05 Mazda Miata Front Wheel Hub & Bearing Assembly Pair Set | eBay
They have discoloring on the casing, similar to how stainless steel exhaust parts do, so I'm guessing they have been heat treated.
The most expensive part in a hub, btw, is the rear seal. They are expensive new and not trivial to take out without damaging. So you **** up that seal, and you're out of a hub. Ask me how I know.

My only question about ceramic ***** - can they handle the load...?
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Old 09-12-2012, 07:59 PM   #49
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Seeing that nascar, formula 1, indy, and i think top fuel dragsters use ceramic bearings, i'd say they will be fine.
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Old 09-12-2012, 08:44 PM   #50
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They should have a load rating listed.
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Old 09-13-2012, 02:22 AM   #51
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Yeah there are bearings, and there are bearings. I'd want to see the load rating.

Edit: I have no doubt the F1 bearings are shweet. But I'd like to see known examples of specific ceramic bearings surviving a race season is what I meant. For miatas.

Last edited by Mobius; 09-13-2012 at 02:39 AM.
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Old 09-13-2012, 09:30 AM   #52
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Ceramic Ball Bearing vs Steel Ball Bearings




http://ecomodder.com/forum/showthrea...hese-5018.html

Btw guys i'm not trying to convince anyone, i'm just posting **** as i find it.
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Old 09-13-2012, 12:25 PM   #53
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LOL It's from ecomodder. Come to think of it I remember on one of my forums hearing about a guy who had an STS miata. He replaced every bearing he could come up with with ceramic and gained several HP on the dyno. I'm talking transmission, wheel, and rear diff.
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Old 09-13-2012, 04:19 PM   #54
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Well its about longevity rather than the possible 4-5 whp you'll gain.
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Old 09-13-2012, 05:17 PM   #55
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Found this interesting paper comparing steel bearing ***** vs Si3N4 *****
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA412842
TL;DR - for same size *****, ceramic ***** have longer median time before failure - at least 6 times more.

Quote:
For the SNHB test data. Table 2 summarizes the K-factor and median lifetimes at 50% 90% and 95% confidence levels. Also shown is the ratio of median lifetimes for the SNHBs to the reference steel bearing median life of 587 hours.

The distributions at the 50%, 90%, and 95% confidence levels are obtained by inserting the respective median lives of 7130, 3954, and 3130 hours into TR in Eq. (16). Also plotted in Figure 1 are the experimental data points for the steel and hybrid bearings. As mentioned above, the values from Table 1 allow the ranking and plotting of the hvbrid
bearing data.
also Silicon nitride - Wikipedia, the free encyclopedia
Quote:
Bearings


Si3N4 bearing parts
Silicon nitride bearings are both full ceramic bearings and ceramic hybrid bearings with ***** in ceramics and races in steel. Silicon nitride ceramics have good shock resistance compared to other ceramics. Therefore, ball bearings made of silicon nitride ceramic are used in performance bearings. A representative example is use of silicon nitride bearings in the main engines of the NASA's Space Shuttle.[21][22]

Silicon nitride ball bearings are harder than metal which reduces contact with the bearing track. This results in 80% less friction, 3 to 10 times longer lifetime, 80% higher speed, 60% less weight, the ability to operate with lubrication starvation, higher corrosion resistance and higher operation temperature, as compared to traditional metal bearings.[20] Silicon nitride ***** weigh 79% less than tungsten carbide *****. Silicon nitride ball bearings can be found in high end automotive bearings, industrial bearings, wind turbines, motorsports, bicycles, rollerblades and skateboards. Silicon nitride bearings are especially useful in applications where corrosion, electric or magnetic fields prohibit the use of metals. For example, in tidal flow meters, where seawater attack is a problem, or in electric field seekers.[13]

Si3N4 was first demonstrated as a superior bearing in 1972 but did not reach production until nearly 1990 because of challenges associated with reducing the cost. Since 1990, the cost has been reduced substantially as production volume has increased. Although Si3N4 bearings are still 2–5 times more expensive than the best steel bearings, their superior performance and life are justifying rapid adoption. Around 15–20 million Si3N4 bearing ***** were produced in the U.S. in 1996 for machine tools and many other applications. Growth is estimated at 40% per year, but could be even higher if ceramic bearings are selected for consumer applications such as in-line skates and computer disk drives.[20]
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Old 09-15-2012, 05:14 PM   #56
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Quote:
Originally Posted by triple88a View Post
Well its about longevity rather than the possible 4-5 whp you'll gain.
Certainly, but it's a side benefit, and was providing anecdotal evidence that it has been done.
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Old 09-15-2012, 11:16 PM   #57
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Quote:
Originally Posted by mtbgael View Post
LOL It's from ecomodder. Come to think of it I remember on one of my forums hearing about a guy who had an STS miata. He replaced every bearing he could come up with with ceramic and gained several HP on the dyno. I'm talking transmission, wheel, and rear diff.
If that was me, I didn't use ceramics. I inquired about it as just a few Spec guys were looking at it, but nobody had figured it out yet for sure. So I rebuilt the trans, diff and rear hubs and had new CV joints built. I didn't dyno the car after it, but the 0-60 was quicker and it accelerated stronger. Then I swapped to a fresh motor, broke it in and after 5k miles swapped on a fresh head. It ended up putting out 118 hp at the wheels with an overclocked stock ecu. The un-broken in engine put out 112 hp.

One of the reasons I did the bearing swap was I was watching trans, diff, rear hub and CV temps and at 90k miles they were all a little too high.

FWIW, there was some talk about ceramics and I didn't dissuade anyone from thinking I did them. Sort of a competitive phych.
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Old 10-25-2012, 01:56 PM   #58
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Just wondering if Soviet or anyone tried going with the G10 replacement steel ***** in the ebay hubs? My right front is starting to make noise on my MSM, and I was wondering if this would be worth or try, or just do the plain repack with Amsoil?
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Old 10-28-2012, 08:36 PM   #59
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Old 10-31-2012, 09:17 AM   #60
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is the size .4375 or .4065?
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