Rear suspensions - what and why?

Quote
alkun
fo what its worth, I lube up the bronze bearings in my JVAB 50mm's ever two or three rallies and they work great.

That's the thing. Bearings are about low friction at high speeds. You can make them "heavy load" service but in the car world everything is considered "light duty" by bearing people. "heavy duty" is things like rock crushers, metal shredders---where you shove in whole cars including the blocks---those monster dump trucks and power shovels in open pit mines where they scoop 40 tons at one go...

A 1200kg car is not heavy duty and suspension isn't "High speed".

A bushing has a larger AREA (each one is about 1.5" tall and there are two) do make for low unit load.

They're not just "pretty damn good" they very good for the job.

Choose good material and they last:
C93200 High Leaded Tin Bronze / Bearing Bronze

......Al.... Sb... Cu... Fe... Pb.... Ni ... P... Si... S... Sn.. Zn

Min/Max 0.005... 0.35.... 81.0 - 85.0... 0.2... 6.0 - 8.0 ... 1... 0.15 0.005... 0.08.. 6.3 - 7.5... 1.0 - 4.0
Nominals - - 83.0000 - 7.0000 - - - - 6.9000 2.5000

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
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Regarding what happens to bearings once grit gets in there... again remember the Focus WRC guy (name escapes me) commenting on how the Reiger shocks had the insert coating change when they went to roller bearings. TiN to something darkish. Wonder if that was a bandaid for that issue. Having looked up the patent on those gizmos, most of what it was about was the profile of the roller dealies. Ones on the outside tube looking like )||( and the ones on the inside like (||) with a needle bearing in the middle; curvey bits to follow the contour of the tube mobetta. Those don't seem all that hard to machine though... needle bearings would have to be on the smallish diameter (the bigger the rollers the more distance between the spring and insert) but that's just finding the right catalog, eh?

I know all this shite sidetracked juuuuuust a bit; it's all been interesting food for thought though, in the sense of "ooh, I wonder why the hugely expensive crap is better" not "ohgod I need to buy this". Or at least I thought so.