Toyspeed.org.nz Message Board

by **Infinite** » Mon Jun 18, 2007 7:43 pm

Are u allowed to drill a 10mm hole in the chassi rail of car? gona put a crush tube were the hole is drilled and then bolt my bracket for hinges on forgot to ask cert guy

by **fangsport** » Mon Jun 18, 2007 9:10 pm

if you fit a crushtube and it's getting certed, should be no dramas.

by **Infinite** » Mon Jun 18, 2007 9:34 pm

yea thats what i was thinking but just incase ill ring my cert guy back tomorrow

by **z|gen** » Tue Jun 19, 2007 8:25 pm

on a similar note, what tube is best to use as a crush tube? need to fit 4 of them for my power steering lol, but not sure what grade tubing to use and what wall thickness etc..

cheers Dave

by **Infinite** » Tue Jun 19, 2007 8:42 pm

called my cert guy today im just going to use some round steel tube 2mm thick.

OMG so shiny! · by **Dell'Orto** » Tue Jun 19, 2007 8:58 pm

So its ok to do so? The swaybar mount holes on my sedan don't go all the way through the chassis, so will need to be drilled out.

by **z|gen** » Tue Jun 19, 2007 9:38 pm

seems by the sounds of it, its sweet as too do, so long as putting crush tubes in, il also be welding a 5mm plate onto the chassis on by sides for a bit more strength as well, seems what most guys do

by **Infinite** » Tue Jun 19, 2007 11:31 pm

its fine todo but will require cert if its noticed... but depending on were it is and what u are doing the rules for it change...

by **RunningRich** » Wed Jun 20, 2007 9:08 am

Infinite wrote:its fine todo but will require cert if its noticed...

I take it by that comment that you are an experienced structural engineer?

Drilling a hole in a chassis rail may have no effect in some areas, but cause the car to rip apart in a crash in high-risk areas. No to be done lightly without some though and knowledge.

by **darkwolf** » Wed Jun 20, 2007 11:21 am

N00b Question....

What's a crush tube? Is it designed that in a crash it'll provide air gap hence it'll crush absorbing impact?

'Pologisse in advance and am praying to car gods for forgiveness.

by **big_boy** » Wed Jun 20, 2007 1:11 pm

darkwolf wrote:N00b Question....

What's a crush tube? Is it designed that in a crash it'll provide air gap hence it'll crush absorbing impact?

'Pologisse in advance and am praying to car gods for forgiveness.

its a peace of tube

ok when you drill thro a chassie you drill thro what looks like a box in 1 side & out the other now when you put a bolt thro that & do it up tight because you have weakened it the box clapases & folds in you have now lost over 50% of you structal interigaie dew to when you hit the box from the ends with the hole in the middle it will crush there as the sides are all ready pulled in makeing it the weakest point

a crush tube means you get a peace of tube drill the hole in the chassie to the same as the out side of the tube then cut the tube 4 thour (0.1mm) shorted than the size of box it slides in to then put your bolt thro the tube meaning you can only crush the box 2 thour (0.05mm) a side before you hit the tube so you loose no strength in your box

by **darkwolf** » Wed Jun 20, 2007 1:30 pm

^

Legend answer, thanks man. Yeah didn't really think that putting a whole in a chassis rail would be a good idea.

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