Improving the Anti-Roll Bar

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Monty-4
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Improving the Anti-Roll Bar

Postby Monty-4 » Wed Aug 15, 2018 1:10 pm

When poking around at the front of my car to find an irritating suspension knock I noticed a lovely hole in the chassis leg (since welded) and badly worn "bushes", or rather plastic hydraulic clamps, that hold the current off-the-shelf front anti-roll bar kit to the car. This got me wondering, would there be a quick and easy way to improve upon this?

A quick search later and I find that the 19mm ID hydraulic clamps are not only dead cheap but can be had in aluminium, which I think may be tougher but still not harder than the bar itself, and a "sound deadening" variety that has a rubber bush insert of sorts. Both potential easy swaps, but still not really designed for the task at hand. A second search led me to SuperFlex's univeral anti-roll bar bushes and mounts (Super Pro also do an identical looking set), which look encouragingly like they could be adapted to work with the existing chassis leg plate with no effort at all other than sourcing a shorter screw.

Furthermore, could the mount to the suspension arms and tie bar be improved with an off the shelf rose jointed rod end bearing?

Has anybody else successfully modified the existing anti-roll bar? I'm not looking to be taunted by those fortunate enough to have the earlier kit!
68' 4-door Saloon, another 'Monty'.

Sleeper
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Re: Improving the Anti-Roll Bar

Postby Sleeper » Wed Aug 15, 2018 3:13 pm

When I fitted mine I found the plastic "hollow" mountings woefully inadequate so filled them with epoxy putty..

just an idea....

John :wink:

Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Wed Aug 15, 2018 6:14 pm

I suppose that would harden them up, although I was looking to ditch the plastic thingies entirely!
68' 4-door Saloon, another 'Monty'.

philthehill
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Re: Improving the Anti-Roll Bar

Postby philthehill » Wed Aug 15, 2018 8:52 pm

Marina anti roll bar link.jpg
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Marina thick lower suspension arm.jpg
Marina thick lower suspension arm.jpg (233.39 KiB) Viewed 532 times
The current anti-roll bar mounts and links can be greatly improved.
Use this type of mount on the end of the roll bar in conjunction with a rose joint(s) connected to either the thick/thin suspension arm as per the Morris Marina/Ital or the tie bar rear bolt.
Photos attached of the Marina thick arm which is the same as the Minor plus the roll bar mount hole and the link between suspension arms and roll bar.

https://www.merlinmotorsport.co.uk/p/an ... r-arb-sc-8

Rubber roll bar mounts held in 'P' clamps are best.


Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Sat Aug 25, 2018 11:18 am

Thanks phil.

I'm going to give fitting the following mount type a try, perhaps somebody knows the size of the allen-headed screw that holds the existing pipe clamps to the bracket?
s-l1600.jpg
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68' 4-door Saloon, another 'Monty'.

Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Wed Aug 29, 2018 5:44 pm

The brackets with the SuperPro bushes are reassuringly heavy duty, those are M10 bolts that I'll likely swap for 3/8".
20180829_173709.jpg
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Now I'm wondering about doing this properly with an internal strengthening tube like the eyebolts...
68' 4-door Saloon, another 'Monty'.

philthehill
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Re: Improving the Anti-Roll Bar

Postby philthehill » Wed Aug 29, 2018 6:56 pm

The front of the chassis rail has no inherent compression strength so the strengthening tube will only be effective if the tube is welded to the chassis rail at either end and which is as you say similar to the eye bolt tube.
If a tube is not fitted and welded to the chassis rail you will be constantly tightening the through bolts.


Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Wed Aug 29, 2018 7:08 pm

My thoughts exactly, the "original" off the shelf kit will crush the chassis leg if overtightened given the lack of strengthening tube. Not a massive job and steel tube is cheap at least.
68' 4-door Saloon, another 'Monty'.

Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Tue Sep 04, 2018 8:46 am

Poly bushed front mounts on. 3/8" bolts with 12mm steel tube strengeners welded in (9.6mm ID fit perfectly around the bolts) and some steel taper washers to make up the angle of the chassis leg on the inside of the engine bay. Conveniently the bolts come through just in front and behind the engine mounts.

What a difference! The setup allows a little more roll but it is predictably limited and the front no longer becomes light and skittish over rough surfaces. I imagine this is due to the mounts allowing some lateral movement and the small amount of flex in the bushes.

I'll look at rose-joints and slide-clamps when the end-bushes get tired. :)
68' 4-door Saloon, another 'Monty'.

IslipMinor
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Re: Improving the Anti-Roll Bar

Postby IslipMinor » Wed Sep 05, 2018 12:11 pm

I have what looks like the same antiroll bar, which was fitted in 1998 as part of the complete restoration project. I did not like the idea of clamping the mounting bracket over the new chassis leg, so got some 5/16" (8mm) plate and made solid mounting plates that I drilled/tapped and then welded them to the front inclined face of the chassis legs.

When originally fitted the bush that slides over the end of the roll bar was only available in rubber, but was replaced with polyurethane a few years ago, and at the same time I replaced the plastic blocks, as a precaution.

The original fitment was 60,000+ miles ago, and they have done the job very well indeed (I do initially fill the grooves with copperslip grease), but otherwise no maintenance at all.
IMG_3016.JPG
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IMG_3017.JPG
IMG_3017.JPG (1.46 MiB) Viewed 237 times
Richard



Monty-4
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Re: Improving the Anti-Roll Bar

Postby Monty-4 » Wed Sep 05, 2018 4:36 pm

I like the idea of the tapped plate, adding strength and certainly less fiddly than tightening a nut inside the engine bay whilst holding the screw still under the car!

My concern with the plastic blocks is that they wear and the ARB can cause an audible knock - hence my preference for a polyurethane bush up front instead.
68' 4-door Saloon, another 'Monty'.


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