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19 Jan 2007, 12:11 (Ref:1819282)
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#1 | |
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Rookie
Join Date: Dec 2005
Posts: 47
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Roll Bar/Sway Bar - what size tubing to use?
Im busy building a roll bar for a FWD racecar.
The rollbar is for the rear and will use adjustable blades My question is what diameter tubing should I use?? thickness etc? Likewise what would I use for the front? Does anyone have any experience in this with FWD Racing cars. Thanks!! |
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19 Jan 2007, 12:47 (Ref:1819322)
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#2 | |
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Veteran
Join Date: Jul 2005
Posts: 1,981
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That is a bit like asking, how long is a piece of string!
It all depends on how long it is, how long the lever arms are and what motion ratio there is between the bar and wheel movement and how much roll stiffness you want. |
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19 Jan 2007, 17:48 (Ref:1819576)
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#3 | ||
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Rookie
Join Date: Jan 2006
Posts: 17
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And what you have already?
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19 Jan 2007, 18:43 (Ref:1819630)
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#4 | ||
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Veteran
Join Date: Sep 2004
Posts: 579
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my [limited] experience with em is use a thin one for road tyres and a thick one for slicks. both available for next to nowt from a breakers yard.Thats for a 216gti anyhow. My problem is that if I made my own Im sure I wouldnt know how to get the best from it unless someone gave me some lessons.And watch out if your scratch built one breaks mid corner!!!
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19 Jan 2007, 21:11 (Ref:1819749)
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#5 | ||
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Veteran
Join Date: Nov 2006
Posts: 9,411
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I would agree with colin and modify old road ones, and dont make them out of tube it may end in tears !!!
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19 Jan 2007, 22:31 (Ref:1819855)
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#6 | ||
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Veteran
Join Date: Nov 2006
Posts: 9,411
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Sorry I left this out
Why I said make them out of an old one, is that they are made out of the correct steel. The only ones I have seen break are fabricated ones . My mate had a front one break at Brands as he went into paddock bend, it immedietely oversteered and spun . He was lucky and got stopped by the kitty litter, |
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21 Jan 2007, 13:47 (Ref:1820930)
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#7 | |
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Veteran
Join Date: Jul 2005
Posts: 1,981
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Anti roll bars can be highly stressed components and should be heat treated - if they are not they can break or become distorted. This means the steel you use has to be heat treatable. Normal mild carbon steel is not heat-treatable. I'm in the UK and I use EN24 on reccomendation of the heat treating company I use but there are other grades available. EN24 is not available in tubing so I use solid. In the US I believe the lowest grade steel that can be heat treated sufficiently for anti roll bars is SAE 4340.
A solid bar will not be heavier than a tube bar of the same rate, so a solid bar gives no weight penalty and is easier to bend without distortion than tube. Hope that helps! |
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27 Jan 2007, 15:01 (Ref:1827169)
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#8 | |
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Rookie
Join Date: Jan 2007
Posts: 1
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What year, make and model of FWD are you asking about?
Donnie |
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