Board logo

Anti Roll Bars
lsdweb - 29/1/09 at 08:27 AM

Hi All

Anybody on here selling anti rollbars for a 7esque car?

Ta

Wyn

Mr Whippy - 29/1/09 at 08:42 AM

you can just take one off a production car and use link arms to connect it to the bottom wishbones, small fiat should be close. See how they have mounted and connected this bar in the pic, very easy to do and can use any bar that will fit in between the wishbones. To stop it sliding side ways simply fit some clamps either side of the bar chassis mountings, something like these ones.

Rescued attachment 00000001.JPG
Rescued attachment 00000001.JPG

smart51 - 29/1/09 at 08:58 AM

catherham sell a nice range of ARB sutiable for a seven. They do diffent stiffnesses and widths and their prices are quite reasonable.

procomp - 29/1/09 at 09:51 AM

Hi

Mr Whippy you realy do talk rubbish sometimes.

Cheers Matt

Mr Whippy - 29/1/09 at 10:26 AM

quote:
Originally posted by procomp
Hi

Mr Whippy you realy do talk rubbish sometimes.

Cheers Matt


explain?

procomp - 29/1/09 at 10:34 AM

Hi

Anti roll bars are used as a device for fine tuning the cars weight transfers. And you have just suggested that any bar of a tin top that will fit in between the wishbones will do.

You do not seem to understand just how much effort goes into selecting roll bar dimensions to get them to work on such a light car or what effect very small changes to those dimensions has.

Cheers Matt

Cheers Matt

Mr Whippy - 29/1/09 at 10:49 AM

quote:
Originally posted by procomp

Hi

Mr Whippy you realy do talk rubbish sometimes.

Cheers Matt




quote:
Originally posted by procomp
Hi

Anti roll bars are used as a device for fine tuning the cars weight transfers. And you have just suggested that any bar of a tin top that will fit in between the wishbones will do.

You do not seem to understand just how much effort goes into selecting roll bar dimensions to get them to work on such a light car or what effect very small changes to those dimensions has.

Cheers Matt

Cheers Matt


Perhaps but he never said he wanted to race only if there were bars available. I simply suggested a method of obtaining a bar and how it could be fitted. I also provided a picture of how a similar bar had been fitted to a Lotus, plus if you look at the picture you’ll see that the link is adjustable so that the spring rate can be adjusted, so getting the rating ‘just right’ when you don’t actually know what that might be exactly for your car isn’t as important.

This is a Locost forum and home built is what this site is all about, not go to a shop and buy one off the shelf, otherwise this would be the something like the Westfield Forum. It’s easy to criticize others suggestions, far harder to some it seems to actually contribute. We have never had a policy of censoring of discouraged members to offer suggestions (though I have seen some who have tried this in the past) and that’s how many of us have learned something new.

Certainly openly criticizing members on here is normally considered plain rude. Though I have a thick skin being an ex-bus driver





[Edited on 29/1/09 by Mr Whippy]

Peteff - 29/1/09 at 10:59 AM

If the production ARB is too strong thin it down with the angle grinder, it works on pen knife back springs 'cos I've tried it. Carry on Whippy

carpmart - 29/1/09 at 10:59 AM

Easy boys!

Its a simple case of good intentions to help from Mr Wippy, though maybe a little simplistic with the advise and Matt pointing out that a lot more 'precision' needs to go into the selection of the right arb!

So, lots of love all round then!

johnston - 29/1/09 at 11:21 AM

There is a formula to work out the rating of a roll bar, going on size length bends etc etc..

A mate of mine uses it to make them for different rally cars.

Find out what you need/want go measure a few tin top's and remember you can lengthen or shorten the arms to suit.

Some of the higher spec mk2 fiestas had quite soft ones at the back.

marmot0 - 29/1/09 at 11:40 AM

formula:

Q = 10x10x10x10 xTxTxdxdxdxd
_______________________
RxRxL

Where
T=track
K= fractional lever arm ratio
d= bar diameter
R reflective arm length
L= half length of bar
S= Length of leaver arm
Q = stiffness in LB