Badger_McLetcher
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| posted on 9/6/09 at 03:55 PM |
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Choice of tubing for chassis
Right, hopefully my last post on my chassis design before its completed!
I was hoping to build this chassis out of 30mm sq 1.6mm thickness tube, I can only find one place that'll sell that, it's bright drawn
(which means warpage) and would cost a LOT to buy in...
So I have three options:
1) 30x30x2.5mm tube at £15.30 per 7.5m (+vat)
2) 25x25x2 tube at £10 per 7.6m (+vat)
3) 1.5"x1.5"x16 or 14swg tube at £16.90 per 6.1 m (+vat)
Now I want to build this car to handle 1000bhp (not saying I'm going to get to that figure at all, but it's nice to have a rigid test
bed!) but even so option 1 seems a bit overkill to me...
What're peoples opinions on this? I would post up a pick of the rough chassis design, but my CAD program is playing silly buggers...
If disfunction is a function, then I must be some kind of genius.
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omega0684
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| posted on 9/6/09 at 04:15 PM |
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what engine are you planning to put in it? it will have to be some monster to get you up near 1000bhp!
option 2 is my guess
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blakep82
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| posted on 9/6/09 at 04:19 PM |
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i say 2 as well, although 3 looks tempting.
my chassis is 2" round tube, i don't know, 25mm always looks a bit too weedy to me. and the 2.5 mm wall on number 1 is far too thick.
given the options there, 2.
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chris_smith
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| posted on 9/6/09 at 05:20 PM |
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where abouts are you?
have you tried hilmar tubes? or hub le bas? or hall & pickles?
they all do square tube
chris
The secret of success is to know something nobody else knows."
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Badger_McLetcher
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| posted on 9/6/09 at 07:44 PM |
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omega0684, the lump is a 1uz-fe 4l V8. I know I can get 500 out of it with minimal work, but want to leave myself some room for future development!
I'm located in South Bristol, so all those companies are quite a way from me, but thanks for the advice, will ring and see about delivery.
If disfunction is a function, then I must be some kind of genius.
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mark chandler
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| posted on 9/6/09 at 08:49 PM |
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Why not just make the lower frame out of the heavy stuff, and 1" 16swg tube for the top.
It’s the triangles that make it rigid, not the size of the tube, no reason not to mix it up a bit if you are concerned, the mechanicals are
effectively on tougher stuff.
If you cut open commercial chassis then you find additional internal plates where suspension and engines mount.
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Theshed
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| posted on 11/6/09 at 07:43 PM |
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If you are serious about 1000bhp then forget erw square tube you are into dragster power and should build a chassis to match! I cannot understand why
you would worry about say an extra £100 or so if you are intending spending £1000s on a an extra 500bhp.
Have you googled "chassisshop" you can buy serious tube and well made brackets in chrome-moly it would probably double the price of your
chassis but in the long run.......
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Badger_McLetcher
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| posted on 11/6/09 at 10:16 PM |
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Hmmm interesting website but barring the old square vs round tube debate which we'll not go into, I see little benefit going with the tube sold
there. Assuming that's 4130 low alloy steel, there seems to be little benefit in terms of yield strength or shear modulus. Just the complication
in welding 
Besides I'm not entering this into high level competitions or anything, I just want a sturdy platform for any mad engine building ideas I come
up with 
If disfunction is a function, then I must be some kind of genius.
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Theshed
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| posted on 12/6/09 at 06:39 PM |
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My thinking that you might want to up the quality of the tubing is influenced by the thought that with 1000bhp you will have huge forces getting that
power to the wheels. You could use lots of tubes or bigger tubes or better tubes but any which way you will need to tie that engine down!
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Badger_McLetcher
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| posted on 12/6/09 at 07:40 PM |
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quote:
Originally posted by Theshed
My thinking that you might want to up the quality of the tubing is influenced by the thought that with 1000bhp you will have huge forces getting that
power to the wheels. You could use lots of tubes or bigger tubes or better tubes but any which way you will need to tie that engine down!
Hehe very true, projectile engines are not part of my plan!
If disfunction is a function, then I must be some kind of genius.
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