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| 10 thou over thrust bearings?? https://www.ausmini.com/forums/viewtopic.php?f=2&t=54959 |
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| Author: | Mick [ Wed Jul 08, 2009 6:36 pm ] |
| Post subject: | 10 thou over thrust bearings?? |
I'm assembling an 1100S small journal crank into a Cooper S/GT engine block. The thrust bearings I have been provided are a set of 30 thou over and clearly don't fit, but by my calculations, with the gap existing I require 19.5 thou removed from each pair of bearings to get them to fit. It would be simpler if I had a set of 10 thou over thrust bearings to start with rather than have them surface ground down by 20... Are 10 over bearings available, or is this the way they need to be done every time one puts an 1100s crank into an S/GT block? Everything else is aces so far... |
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| Author: | 850man [ Wed Jul 08, 2009 6:51 pm ] |
| Post subject: | |
You will need to have your 030 thrusts surface ground back to the required size as they never made 010 thrusts, only std, 003 & 030. The 030 thrusts become quite hard to get for a while until i had them remade & yes, it is common to do this when you fit a 1100S crank into a Cooper S block. |
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| Author: | Mick [ Wed Jul 08, 2009 6:53 pm ] |
| Post subject: | |
Cheers David. I'll have them done tomorrow... |
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| Author: | drmini in aust [ Wed Jul 08, 2009 7:03 pm ] |
| Post subject: | |
Don't make them too tight. .003" is NOT enough on a 1275 crank if you are going to rev it. I have a set of overheated thrusts and centre main shells to prove it. It damn near spun the centre main... .005"endfloat is OK, .006" safer. For racing, GR uses .008". 
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| Author: | Mick [ Wed Jul 08, 2009 7:07 pm ] |
| Post subject: | |
5 thou sounds good to me. So I'll be subtracting another up to 2.5 from each side to make the five Therefore 18 thou from each. edit: oops, 17 thou... Cheers Doc. |
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