#11
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I'll second Mark B's comment. The lower wishbones on my MK Indy bent and broke when the previous owner had the knock which turned it into a Cat C loss. The great thing is there was no structural damage to the chassis as they worked just like crumple zones hence it's not an expensive process to get it back on the road.
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#12
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This is very interesting to me; I'm at the stage where I'm looking at wishbone materials.
I was under the impression (probably wrongly) that the wishbones had to be seamless? Is there any risk that the ERW would fail during normal driving/ harsh cornering? Also, as I wouldn't mind doing track days in the distant future (when I eventually get it finished). Would the use of ERW cause problems here? |
#13
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For track use I would use 18swg but for road use I would go up to 16swg or even 14swg...all ERW.
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#14
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I would think that CDS / Cold Drawn Seemless tube was specified to stop people using any old length of tube and not knowing what it was for the wishbones. ERW will be fine for the wishbones although I would not go any thinner than 2mm wall top and bottom,don't forget that they are only bolted to 3mm suspension brackets and half of those have 50% material coverage welded to a 1.6mm walled chassis.
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Website http://www.talonmotorfabrication.co.uk/ Direct email phil@talonmotorfabrication.co.uk talonmotorfabrication@gmail.com Mobile office hours 07514098334 |
#15
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Quote:
I would be horrified if my wishbones broke before it ripped the chassis brackets off that piece of 1.6mm wall thickness box section. I would rather believe that the wishbones were not properly made or welded Bob
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When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 |
#16
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Which would you rather after an accident? 1. Replace one maybe two wishbones at £80 ish 2. Strip down the entire car, replace the £700 chassis (or make repairs to the damaged part) and then rebuild the car. TK
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#17
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Quote:
For exmaple: Alloys are used over steel wheels as they break so they don't damage the suspension. And wishbones as TK points out are sacrificial. Better to damage a wheel and a wishbone than wreck a whole chassis. |
#18
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If a car like a 7 is shunted the chassis is scrap and should be replaced as you can't repair it properly as it will have bent it, I have seen it first hand and been asked to repair an early Westfield but even though it only had a slight slap at the front the whole thing was out of shape. I turned the job down and the lad bought a new chassis.
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#19
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Alloy wheels are used because they are lighter and for that reason only ,there is nothing wrong with steel wheels and they are still fitted to many cars. They are not part of some sort of engineered crumple zone. As for the wishbones you may have forgotten they are triangles therefore strong. A bit of 3mm bracket welded to a 1.6mm thick box should give out long before a wishbone period! I would sooner all four wheels were still on my car in a knock over a bent chassis any day as you might be travelling at speed still. Sod the chassis.
I cant think of a single car made that allows its suspension to be ripped of in a knock , most of them just mangle up the subframe and bend things. Scenario. I am diving down a dual carriageway and drive over a brick, I am now driving down the road with three wheels on my wagon at 70mph thinking great my chassis is still good. Bxllxcks Totally unconvinced Bob
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When The Results Disagree With The Theory: Believe The Results And Invent A New Theory If I had two brains I,d still be a halfwit The cave http://s1116.photobucket.com/user/my...deshow/mancave The build http://www.haynes.co.uk/forums/showthread.php?t=12669 Last edited by robo : 15th April 2012 at 12:12 PM. |
#20
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