I was just looking at the "Mojo" thread and followed a link to the Sylva web site. After a bit of poking around, I found this interesting little excerpt:

"A bolt is a clamping device. It is not a pivot. A suspension mounting bolt’s primary function is to clamp the chassis mounting bracket against the bush pivot (crush) tube. The suspension does not pivot about its mounting bolt. 0.5" (12.7mm) holes are drilled in the suspension mounting brackets and 12mm bolts are supplied in the bolt pack. This results in a 0.7mm clearance. This is by design. Just to reiterate, the bolt is just a clamping device, not a pivot. If the 12mm bolts are correctly torqued, there will be no slop or play in the suspension.

Tightening Torque
All 12mm suspension bolts, 65 - 75 foot pounds."

I believe Sylva have been building cars for some time, so I presume they know what they're talking about.

on every thread regarding bushes that i have read, this has been universally agreed upon. the point of contention is whether the crush tube is longer or shorter than the bush, ie whether the bush is slightly free or slightly compressed.

I seem to remember someone was adamant that a bolt was OK to use as a pivot.
I think it's fairly universally accepted the length of the crush tube has to be the same as the internal width of the bracket and then, if using PU bushes, they should be around 0.5mm longer overall (when assembled as a pair) than the crush tube.
Obviously solid plastics such as acetal and Nylon would need to be the same length as the crush tube.....but bush length was not what this thread was about.

As the bowl of petunias said:

"Oh no, not again"

James

Is there a rule of thumb for what bolt diameter to use with what crush tube ID?
We are using Nissan Bluebird trailing arms with the std bushes and the ID of the crush tube is bigger than the rest of our suspension (GTS poly bush kit). I'm not sure exactly how big but i'd estimate maybe 14mm.
Also, is the idea to get the crush tube to fit as precisely as possible in the bracket so when tightened it doesn't bend inwards at all? I'd guess it is so would you just use washers to space it out suitably.

Nice little nugget about what torque to do em up to, that's a lot higher than I'd have thought!

quote:

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Originally posted by mackie
Is there a rule of thumb for what bolt diameter to use with what crush tube ID?
We are using Nissan Bluebird trailing arms with the std bushes and the ID of the crush tube is bigger than the rest of our suspension (GTS poly bush kit). I'm not sure exactly how big but i'd estimate maybe 14mm.
Also, is the idea to get the crush tube to fit as precisely as possible in the bracket so when tightened it doesn't bend inwards at all? I'd guess it is so would you just use washers to space it out suitably.

Nice little nugget about what torque to do em up to, that's a lot higher than I'd have thought!

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all I can add is that whenever ive worked on car suspensions using rubber bushes, the suspension arms didnt flop down when diss-assembled, so the rubber stops that happenning. IE, the rubber 'twists' not the inner tube....

atb

steve

[Edited on 18/10/04 by stephen_gusterson]

quote:

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Originally posted by Hugh Jarce
I seem to remember someone was adamant that a bolt was OK to use as a pivot.

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James,

You must stop taking those drugs!!

Ned.

quote:

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Originally posted by James
As the bowl of petunias said:

"Oh no, not again"

James

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OH God - please no........


Not the great bush/crush tube deabte again??? life really is too short

I hear the Americans are doing away with bushes altogether in the upcoming election...

Here we go again...
Syd,
What's the problem with this?
Is it still a bone of contention what Hugh said about the bushes being a fraction wider than the crush tube? It all seems perfectly sensible to me, you've even said on here that there's nothing wrong with the PU bush/crushtube arrangement where the bush pivots on the rigid crush tube.
A bit of clamping force on each side of the bush will stop if from slopping side to side will it not?

I don't really want to open a can of worms but reading your previous comments on this subject, I can't see what the problem is.

LOL andkilde


[Edited on 18/10/04 by indykid]

[Edited on 18/10/04 by indykid]

Rescued attachment can_o_worms.jpg

quote:

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Originally posted by Northy

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you had to edit that twice!!!!

quote:

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Originally posted by indykid
LOL andkilde


[Edited on 18/10/04 by indykid]

[Edited on 18/10/04 by indykid]

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about the bush thing....

someone said on the radio today that in Iraq


'shock and awe'

has not turned into

'aaaawwwww shucks!'

atb

steve

quote:

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Originally posted by stephen_gusterson
you had to edit that twice!!!!

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for your info, the second time you edit a post you can delete the first bit that says 'edited by' etc so you only ever need show one 'edited by' line.

Ned.

ah touche

cheers
tom