Is there any kind of standardisation to the dimensions of the suspension bushes typical to kit cars?

I am building a Haynes Roadster. The book specifies 44mm spacing of the brackets / crush tube length, for bushes fitting into a 28.5mm i.d. by 35mm long wishbone tube (therefore = 4.5mm bush flange).

Yet, I can find online suppliers for e.g. 42mm crush tubes fitting into a 28mm i.d. wishbone tubes with a 4mm bush flange.

Those dimensions are too close to be coincidence, yet none are the same! Is this a metric / imperial conversion situation or what?

Also you can find (expensive) 1.5" (= 38mm) crush tubes fitting into 1 1/8th" (= 28.6mm) wishbone tubes with a 3/16th" (=4.76mm) bush flange, so this would require a 1 1/8th" (28.6mm) tube on the wishbone ends instead of 35mm as per the Haynes book. (My head hurts!)

Finally, the seamless tubing 33.7mm o.d. with 2.6mm wall (= 28.5mm i.d.) used on the ends of the wishbones seems hard to find, it's not a standard size so must have been selected specially. Is this yet another case of imperial to metric?

What sort of tolerances should I expect all this stuff to meet anyway?

Regards, Ian

I'm sure Chrisg will be along shortly to answer you question.

Mike

[Edited on 27/9/07 by mike smith1]

Strap in, it could be a bumpy ride

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Originally posted by AndyH
Strap in, it could be a bumpy ride

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