Where find Oversize Rotor Bearings
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Senior Member
Joined: Nov 2003
Posts: 533
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From: Sweden
Where find Oversize Rotor Bearings
I want to get hold of some oversize rotor bearings.
Mazda Competition has a 20B rotor bearing that has o.d. 1mm extra.
But I can't find it to buy anywhere??
The Mazda OEM-number is ZRY1-11-B21
Is there any other way to go? I want to re-use rotors that had spun.
Mazda Competition has a 20B rotor bearing that has o.d. 1mm extra.
But I can't find it to buy anywhere??
The Mazda OEM-number is ZRY1-11-B21
Is there any other way to go? I want to re-use rotors that had spun.
rat ta tat tat
Joined: Aug 2012
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From: pinwheel galaxy
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Thread Starter
Senior Member
Joined: Nov 2003
Posts: 533
Likes: 3
From: Sweden
If I know you right, I guess they are not for sale 
I have found another source, but right now it seems I do not need them at all, but it's good to know where it is.
Anyway, there should be someone who can produce similar bearing on demand. It's not nuclear physics, and it is guaranteed not to Mazda themselves who stood and made them without a sub contractor.
Extreme Rotaries uses ceramic coating in their race bearings. Can you get someone to put on the coating, it's easy to turn a sleeve of these dimensions.
The advantage that I see with custom, or oversize is the deeper oil groove.
Seals and Bearings
I have found another source, but right now it seems I do not need them at all, but it's good to know where it is.
Anyway, there should be someone who can produce similar bearing on demand. It's not nuclear physics, and it is guaranteed not to Mazda themselves who stood and made them without a sub contractor.
Extreme Rotaries uses ceramic coating in their race bearings. Can you get someone to put on the coating, it's easy to turn a sleeve of these dimensions.
The advantage that I see with custom, or oversize is the deeper oil groove.
Seals and Bearings
Joined: Mar 2001
Posts: 31,835
Likes: 3,233
From: https://www2.mazda.com/en/100th/
i think you could probably order the bearings from mazda they just don't have any in the USA, but they don't have oil filters either.
B i think if you can make a 4 rotor, you could also make a bearing... the trick are the overlays
B i think if you can make a 4 rotor, you could also make a bearing... the trick are the overlays
talking head
Joined: Apr 2008
Posts: 2,775
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From: Perth, WA, OZ
he wants a replacement for SPUN bearings.. not oversize / undersize for the crank clearance
i do recall seeing a trader doing these .. cant quite recall who
.. but i know goopy do a custom 10a bearing and i suspect its them doing the oversize 12a/13b bearing .. give them a msg
when you find out.. post it up.. i have a collection of 13bt rotors that could do with this
i do recall seeing a trader doing these .. cant quite recall who
.. but i know goopy do a custom 10a bearing and i suspect its them doing the oversize 12a/13b bearing .. give them a msg
when you find out.. post it up.. i have a collection of 13bt rotors that could do with this
Goopy performance also sells oversize bearings for spun rotors. for some reason it's not listed on my price sheet though for the oversize bearings.
Last edited by RotaryEvolution; Aug 29, 2012 at 05:25 PM.
Rotary tuner
Joined: Feb 2004
Posts: 124
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From: In Sweden
This is a competiton bearing for using 13G rotor on 13B/20B shafts and it's hard to find 13G rotors so im not sure that Mazda make them any more....
Yes it's true that Goopy can do this if you got a spun bearing.
I have done this on bad rotors and the fact is that I told Jonathan a few years ago how to do it on bad rotors
Yes it's true that Goopy can do this if you got a spun bearing.
I have done this on bad rotors and the fact is that I told Jonathan a few years ago how to do it on bad rotors
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