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Spacers?arthurbrown
@GUEST
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Apr 14, 2007 17:48:55 GMT
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Any experts care to give me some gen on spacers? Today I has put some phat new r1mZ on my BMW ( see readers rides ) but this spacer thing is bustin' my balls. First up, the front wheels wouldn't 'spin' as the wheel was fouling the brake caliper. A r s e ! So I boshed on some 3mm spacers, which seemed to give enough clearance to let the wheel turn when the car was raised. Hurrah, I thought, and went for a test run. However, it was clear this wasn't right as there was a 'wummm wummm wummm' noise coming from the front end, obv related to speed. Worried, I went straight back home for a re-think. I then tried some 5mm spacers, but this seemed to have little effect. I'm a bit concerned with the design of the spacers you see... they are a 'universal' type like this~:  Problems I can see are: a. they are a ball-ache to get on properly as you canna see what you are doing. b. the centre bore on them is huge, and therefore not hub-centric - how are you meant to get them on straight? c. the multi-fit design allows too much 'play' when in 4x100 guise... Of course I may be barking up the wrong tree, but I'm sure if I had something that fitted the centre bore and was a single stud pattern it would sit central and remove this scuffing noise that I am getting. Your thoughts? |
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Apr 14, 2007 18:15:16 GMT
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Hmmm I'd be tempted to somehow fix them centrally to the back of the wheel, just with masking tape or something, so when you bolt them up you know they're not going to unbalance the wheel. Failing that, can you get proper 4x100 spacers, with holes not slots? I did have a look at some for the mongdeo when it started to shred tyres on the strut, and they consisted of a similar spacer to the one you pictured, and then four extension nuts. Screw those into the hub and tighten up, then the spacer slots over the top and should be fixed centrally. Your wheel nuts then screw into the extension nuts. They looked a bit like the jack posts either side of a PC printer port, monitor port, serial port. edit: like these  (except these are for a mini |
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Last Edit: Apr 14, 2007 18:17:26 GMT by Pillock
Never trust a man
Who names himself Trevor.
Or one day you might find
He's not a real drug dealer.
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markbognor
South East
 
Posts: 9,970
Club RR Member Number: 56
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Spacers?markbognor
@markbognor
Club Retro Rides Member 56
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Apr 14, 2007 18:17:51 GMT
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I've been told in the past that non-hubcentric spacers are a bad idea, all the forces invoved are directed into the studs/bolts rather than the hub, thats why factory wheels center bore is the same as the projection on the hub. Although if this sticks out further than the width of the spacer that should be ok.
How about sticking the spacers to the hub with a small ammont of something like carpet double-sided tape to hold them in place while you bolt on the wheels. Or perhaps copper grease might hold them in place long enough?
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Apr 14, 2007 18:36:33 GMT
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Wouldn't these be better?  Still got a big centre bore, but because they're four-stud ones instead of generic multi-stud in theory they should always centre themselves, they can't go out of alignment once four studs are through them. |
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Last Edit: Apr 14, 2007 18:37:06 GMT by Pillock
Never trust a man
Who names himself Trevor.
Or one day you might find
He's not a real drug dealer.
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markbognor
South East
Posts: 9,970
Club RR Member Number: 56
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Spacers?markbognor
@markbognor
Club Retro Rides Member 56
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Apr 14, 2007 20:00:07 GMT
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They can drop if the slots have a greater diameter than the studs. If the slots are 14mm and the studs are 10mm they can obviously drop the difference. Would, I think, be less though if they were lined up with the studs at 45 degrees rather than 90/180.
How important is this in practice, obviously any eccentricness would lead to vibration but when does it become noticeable?
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Apr 14, 2007 20:30:24 GMT
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I put some 5mm spacers like Pogs on the back of the polo. I managed to get them pretty central by semi tightening the bolts and then twiddling them around with my finger. The wummming noise may be a wheel out of balance. I had it coming from the front nearside on the Polo and it disappeared when I changed it for the spare. Obviously this is unlikely if it's coming from both sides, but listen carefully!
HTH Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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Spacers?arthurbrown
@GUEST
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Apr 14, 2007 20:38:40 GMT
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Hmm. I suppose it -could- be unbalanced. I've never experienced one make a noise like that before, but I'll not discount it. Maybe I'll get them on a machine tomorrow. If that is the case I recon I will go back to he 3mm spacers, as less = better really as there's more 'meat' of the studs in the hubs. I'm going to get my mate round at some point for a strokey chin meeting - he runs a machine shop so I reckon something a bit more 'specific' can be run up with a little lateral thinking.  |
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Aaron
Part of things
Posts: 225
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Apr 14, 2007 20:43:48 GMT
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How about machining the friction surface off a pair of old car-specific discs to just leave the flat piece that sits against the hub? These would be exactly the right PCD and centre bore.
Aaron.
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1975 Toyota 1000 with 4A-GE (tweaked a bit)
1992 Nissan GTi-R (now sold after 17 years)
2001 Subaru Impreza WRX (remapped)
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Apr 14, 2007 21:43:49 GMT
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How about machining the friction surface off a pair of old car-specific discs to just leave the flat piece that sits against the hub? These would be exactly the right PCD and centre bore. Aaron. That is an unbelievably good idea! |
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1997 TVR Chimaera
2009 Westfield Megabusa
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