Anti rollbar upgrade

[MagicWagon]

I have to replace the anti rollbar D bushes on my 1983 2.0l air-cooled Devon. I'm wondering if it's worth me upgrading to a 23mm one while I'm at it. I was looking at the brickworks eibach one. It's quite expensive, but the van is a keeper, so if it's worth it I might go for it. Will I notice improved handling, or is it marginal ? Should I replace anything else at the same time eg radius rod bushes, drop links, droplink bushes, lower control arm bushes ? Or will that significantly complicate the job if they are not close to needing replacement ? Thankyou.

[slippy8v]

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[slowcoach]

Replacing those d bushes is very easy, you won't even need to remove the roll bar to do it. So beware, the can of worms

[Aidan]

not sure how much of an upgrade on the 21mm that would be, on a leter van with the 19mm probably worthwhile, but spoiler is best upgrade for headwind lifting the front

[RogerT]

Torsion stiffness is a function of the fourth power of diameter of the bar, so 21mm->23mm is an increase of 1.4 times, so 40%?

19mm->23mm is 2.1 times stiffer

19mm->21mm is 1.5 times stiffer?

[MagicWagon]

Thanks for the replies. I didn't realise I had a 21mm bar, thought it would be 19, so probably not worth the cost of upgrade to 23mm. However, it failed the mot on anti roll bar bushes, with advisories on drop link bushes. Also failed on steering fouling suspension. The drop link on one side touches the radius rod on full lock. Probably not helped by fitting electric power steering, making it much easier to get full lock. Mot technician reckoned that issue may be fixed by changing all the bushes, so I'm changing the ARB and droplink bushes and radius rod bushes for powerflex. Fingers crossed.

[steveo9007]

I upgraded to the 23mm ARB from brickwerks and i really liked the easy idea off the drop link being bolted on the end instead of a ring, so would make for changing really easy i did update all my bushes to power flex and can say it sits lovely and handles very well.