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Thread: Millie antiroll bar

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  1. #21 Re: Millie antiroll bar 
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    Quote Originally Posted by cabrioman View Post
    Paul
    <snip>
    If you look at the parts catolog at https://ford.7zap.com/en/car/?view=list it shows the ARB options for the different models including diameters. If you select the broad year range and don't put in a specific variant it shows all ARB for all models for the particular year range. Interestingly it does not show differences between 4dr and 3dr.
    <snip>
    John
    Thanks for pointing me at that parts web site. I have used a similar one:
    http://www.fordopedia.org/parts-cata...erra-mk1/B1.10

    This one list one part number for 24 and one 28 mm diameter bars but 4 different 26mm bars. These are two types for GB and two for Germany (D). 7Zap adds another part number. Trying to figure how these relate to cars will only ever lead to madness!
    Paul
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  2. #22 Re: Millie antiroll bar 
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    Kahawi and others,
    Thanks for all the good information.

    This bit of steering geometry is a triangle with the TCA on one side, the ARB and chassis on the other two. The dimension I really want to verify is the chassis side of the triangle. The question is was my mounting plate welded on too far forward. I have marked up your picture...

    Arb-2.jpg

    The easiest measurement on an assembled car is from the back of the TCA mounting face to the centre of the front U mounting bolt.
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  3. #23 Re: Millie antiroll bar 
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    Paul,
    have you thought of reducing the length of your H/D bush to move the TCA back and adjust your caster angle? If you cut down the 'crush' tube and remove the same amount from the inside faces of the bushes the TCA will move back. So long as you don't remove so much that the nut hits the end of the thread it should be OK. Easier than having the shoulder of the ARB removed. Just an idea.....
    Peter
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  4. #24 Re: Millie antiroll bar 
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    Managed to take some measurements for you Paul.

    The ARB measured as you wanted on my 24mm ARB is 319mm on both sides.

    Taking a measurement from the centre of the front ARB u-mount bolt to the face of the TCA mounting lug (lug nearest engine) gives a measurement of 270mm both sides.

    John
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  5. #25 Re: Millie antiroll bar 
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    Quote Originally Posted by Peterx View Post
    Paul,
    have you thought of reducing the length of your H/D bush to move the TCA back and adjust your caster angle? If you cut down the 'crush' tube and remove the same amount from the inside faces of the bushes the TCA will move back. So long as you don't remove so much that the nut hits the end of the thread it should be OK. Easier than having the shoulder of the ARB removed. Just an idea.....
    Peter
    I have. The problem is a reduction of 12mm is quite large and I think I will end up with a pretty solid joint. That might be just as bad as the compression strut.
    Paul
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  6. #26 Re: Millie antiroll bar 
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    Quote Originally Posted by cabrioman View Post
    Managed to take some measurements for you Paul.

    The ARB measured as you wanted on my 24mm ARB is 319mm on both sides.

    Taking a measurement from the centre of the front ARB u-mount bolt to the face of the TCA mounting lug (lug nearest engine) gives a measurement of 270mm both sides.

    John
    Thank you John. I am very grateful to all who have gone to the effort of taking measurements.
    Paul
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  7. #27 Re: Millie antiroll bar 
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    Paul, don't know if this is of any use to you but I have just measured the dimension from the centre of the ARB at the chassis mounting point to the centre of the lower suspension arm at the point where the ARB is attached as 400mm +/- a small number of millimetres. The same both sides. I haven't measured the castor angle but the self cantering on my car is quite strong suggesting that it may be a bit on the high side but not high enough to be a problem, in my opinion.
    Geoff
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  8. #28 Re: Millie antiroll bar 
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    Quote Originally Posted by Peterx View Post
    Paul,
    have you thought of reducing the length of your H/D bush to move the TCA back and adjust your caster angle? If you cut down the 'crush' tube and remove the same amount from the inside faces of the bushes the TCA will move back. So long as you don't remove so much that the nut hits the end of the thread it should be OK. Easier than having the shoulder of the ARB removed. Just an idea.....
    Peter
    Wouldnt suggest doing that. Firstly a say 6 mm cut back would only give 3mm shift of the track control arm. Secondly if the service parts were replaced with standard off the shelf in the future then there would be a few surprises in store! Peter.
    Last edited by greyV8pete; 27-03-2019 at 08:13 PM.
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  9. #29 Re: Millie antiroll bar 
    frequent forum contributor Club Member greyV8pete's Avatar
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    Coincidentally I have just finished machining my anti roll bar shoulders back to get castor from the previously excessive 9deg down to 6deg, which is a figure more suited to road going cars. Will post more info and dimensions tomorrow. Watch this space as they say! Peter.
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  10. #30 Re: Millie antiroll bar 
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    I gotta admit I was surprised to see thicker ARBs commanding quite a price hike on eBay. I pondered how much difference moving from 24 to 28mm would make. I didn’t think it could make much difference. The most excellent Roy Mech website http://www.roymech.co.uk/Useful_Tabl...n/Torsion.html supplied the relevant formula. See that site for full explanation of the formulae. Warning maths is not my strong point. Θ the angle of twist is given by:

    F2.jpg

    Where J' = Polar moment of inertia (m^4 = cubic metres).For circular sections this is derived from the radius.

    F1.jpg

    So the angle of twist is related to the reciprocal of the radius. A bigger the radius (thicker bar) will make the twist smaller, which makes sense.

    Assuming everything else is equal and accepting that the ARB is not a uniform bar I calculate:
    For 24mm diameter r^4 = 20736 mm^4
    For 28mm diameter ARBs 38416 mm^4 is getting on for double thus halving the angle of twist.
    The 18mm ARB 6561 mm^4 is about 1/3 the torsional strength of my 24mm version.

    I have seen it said that there are 16mm ARBs but I suspect they only fitted to Sierra Unicorns.

    I have seriously contemplated cutting out the centre section and welding in a much thinner section or creating some ingenious device to machine down my centre section. But right now I think castor is the main problem.
    Paul
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