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Location:
Christchurch, New Zealand
Registered:
March 2004
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wheel bearing sleeves
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Mon, 04 October 2004 06:08
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I bit of a search turned up a few blanks.
a bit of a brake upgrade question...
http://www4.tpg.com.au/users/loats/technical/ma61/ fronthub.html
On this site it mentions one option of being able to run the later model crown hubs is to used pressed steel sleeves over the stub axle to increase the diameter to that of the crown inner wheel bearing diameter.
Now in an attempt to get big brakes and 5-stud onto my rt40 corona i am considering this.
Wondering what peoples opinions are.
Points i can think off are
1> very precision machining required, with interference fit on stubaxle.
2>hardness of sleeve must match that of the stub axle..
3> bearing area must be similar...
3>will the buggers come off...
4> is it dodgy
5> anyone done this before?
My ideal goals are, but i dont think this will effect the offset is...
>increase track such that i can run fwd offset rims to match a wider rear end (hilux)
>big brakes
so what opnions to you guys have?
Thanks
Logan
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: wheel bearing sleeves
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Mon, 04 October 2004 06:58
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| SRacin wrote on Mon, 04 October 2004 16:08 |
Wondering what peoples opinions are.
Points i can think off are
1> very precision machining required, with interference fit on stubaxle.
2>hardness of sleeve must match that of the stub axle..
3> bearing area must be similar...
3>will the buggers come off...
4> is it dodgy
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1, yes. final diameter must match that required for the original stub axle on the crown. also remember that it is a sliding fit, not a press fit between stub and bearing. heat and shrink could be a way to fit it.
2, stub axle need not be that hard, since the inner bearing race is what takes the wear, not the stub.
3a, need to at least have the same bearing area, and the more material you have (for the same interference fit) will make it harder to get them off.
3b, well, you don't want them to come off. bearing heat could be an issue.. just from a thermal expansion point of view, causing the sleeves to come loose (with the pounding they will get from potholes etc). maybe this is not a prob as heat will not be that great..
not necessarily if done with a bit of thought. how thick will this ring be?
Cya, Stewart
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: wheel bearing sleeves
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Mon, 04 October 2004 07:09
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Well I havent been to measure anything up yet, just planning before i go measuring, but ithink going by that website
inner will be = (21.986-19.050)/2 = 1.468mm
outter = 34.988-31.750 /2 = 3.238mm
But I think the RT40 has an even thinner stub axle, not sure..
This is actually pretty thin, could be difficult to machine, would want a very good surface finish on it also..
I suppose i could do some calcs on it, find out the thermal expansion etc...
I think before i go measuring things, i'll talk to the local certifier, see what his opinions are. (but might ruin my chances of getting away with it, hed neva know lol, no biggie, i want it to be safe..)
Thanks
Logan
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Location:
Gold Coast
Registered:
May 2002
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: wheel bearing sleeves
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Mon, 04 October 2004 23:09
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Alright excellent.
This is the sort of info i want to here.
I guess s4 hubs would be a good choice being 5x114.3
Then it would be a matter of making caliper mounting brackets, but i reckon that would be fairly simply..
Do you by anychance have the dimensions of the hubs, Im hoping that it pushes the mounting surface out quite far such that i can run same offset front and back. Looking at a +35 to +40 offset to get back to a factorish track.
Cheers for the info
Logan
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Location:
brisbane
Registered:
May 2003
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Re: wheel bearing sleeves
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Mon, 04 October 2004 23:29
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I have done the exact same thing on my BMW... It served two purposes... converted to 5-stud and also created the offset I needed for my wheels and new disc rotors... If it's a direct slip over sleeve, I would make it a slight interference fit...
Mine was a snug fit, in that I had to gently tap it into position and seat it... I had mine made from Chromemoly though as I have a slight overhang due to the new bearings being slightly winder then the std ones, better to be safe then sorry... 
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Location:
Lost in the K hole
Registered:
May 2002
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Re: wheel bearing sleeves
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Tue, 05 October 2004 03:53
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good website that one, huh?
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Location:
Christchurch, New Zealand
Registered:
March 2004
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Re: wheel bearing sleeves
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Tue, 05 October 2004 06:38
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nah not really its pretty average 
lol..j/k..Some interesting info on your site there.
Hopefully I can sort out the bearing issue.
I might try some local bearing manufacturers, and retailers on the offchance they would have a suitable bearing.
I know i can get crown (ms112 or ms65 (non 72)) hubs and brakes filthy cheap, but i like the idea of alloy rx7 hubs, might have to try find some. First stop i think will be a bearing catalogue, saves measuring at the wreckers..
Thanks for the help so far all..
Logan
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