What front hubs to buy
#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
20pcs 13/32" 10.318mm Ceramic Diff Bearing ***** Si3N4 GRADE 5 G5 | eBay
#43
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theres some talk in spec miata forum about ceramic bearings but nothing concrete
Spec Miata Community: New Wheel hubs
Spec Miata Community: New Wheel hubs
#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...?
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...?
#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.
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 01:39 AM.
#52
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.
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.
#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.
also Silicon nitride - Wikipedia, the free encyclopedia
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.
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.
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.
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]
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]
#57
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.