Help identify Rear Anti Roll Bar

[Johnny]

I was looking around under the car again trying to visualize the idea of the flipped installation. With some rough estimates it seems that the blade length could be the same whether mounted front or back.
The bar would be doing the same job based on blade length, and the blades would sit more level because of its lower mounting point.
The links at the wheels seem to be adjustable for length, so that may not be an issue.

The only limitation would be the interference of the exhaust system and the square bar running the width of the car.
This car was fitted with a side exit exhaust from London so this was not a problem.

I have revisited an image from the Revs Digital Library. Car #1. It is of the cars 2nd race, SCCA National Lime Rock July 4 1967, which it won and set a track record, I just like saying that.

Anyway, here is a link to the image, it allows you to zoom in fairly well. I'm not 100% sure, but it does look like the bar is in front of the wheel, hanging quite low.

https://purl.stanford.edu/dr492kd8175

This makes me wonder if any other cars running the side exit exhausts in 1967 were running a similar set up. I know the Cooper Cars, and some Works race cars had the side exhausts, just do not recall ever seeing roll bars hanging down like this.

Johnny

[mk1coopers]

It certainly looks like it's running forwards in that picture, I know the small diameter Janspeed bar I had fitted also mounted this way, it just cleared the original exhaust.

[Ronnie]

Well thank’s for that link (fantastic quality) https://purl.stanford.edu/dr492kd8175 . There is no doubt that it is running with the ARB fulcrum in front of the rear wheels in period In effect that is no different to the fitment of a Speedwell bar, and in effect it is the distance I would think from the wheel centre that would be important, although it might change some of the dynamics of the installation depending on the distance (very successfully no doubt). It would be interesting if any members who are racers/ hillclimbers, or indeed formula 1 racing mechanics/ designers could comment.

Tulka does your drawings have any installation information or are they just engineering drawings of parts

Speedwell

[Jack of all trades]

The remnants on Colgates car however are of a bar designed to be used the other way around. That's why the mounting plate is the exact same size as the rear subframe where it angles up. It should be mounted like this (as i've told earlier);

[Ronnie]

My bar was mounted the same as yours ( which as you say it was intended), but the way the bar works (I don't have any experience of setting one up I removed the bar in 1973 and hung it on the wall till the other day), depending on the fulcrum centers as stated in the previous post, I don’t see a lot of difference between a Coopers or a Speedwell where it is mounted if it suits your driving style. stiffness of the bar may be proportionally altered/different, to the same rear mounted bar but the bar has got the rose jointed links (instead of fixed links) I would think to make it infinitely adjustable, so where is the problem. I would think one driver with the same Coopers ARB as you may run with a slightly different set up to yourself even with the bar located on the rear of the subframe.

It most certainly did not stop Mr Colgate from being highly sucessfull with the bar mounted where it was

[Nevsmini]

This type bar was used by CCC as early as the start of the 65 season with there Hydrolastic cars. See pics below

[Johnny]

Nice Pics.
Good to see they did not fit the ARB backwards.

[Exminiman]

Hats off, facinating thread, still amazed at depth of knowledge of members of this forum.......

[Nevsmini]

Looks like the was at least 3 types of this bar. Maybe different manufacturers or just and evolution of the bar to make it better.

[ivor badger 2]

Nice Pics.
Good to see they did not fit the ARB backwards.

I did fit effectively backwards for my own reasons. To a rubber car. The mounting points on the car must be rigid to the chassis, which is why zbarbera's bar is largely ineffective. The rear bar of the subframe will flex with the load to be taken by the bar twisting disappearing into the subframe rear channel. You are not alone in this mistake, Ferrari did it to an F1 car in 1963.

[Pete]

Pictures of a new old stock Special Tuning ARB that have just appeared on Facebook....

[Nick W]

Nice find !

[Johnny]

That’s amazing. I could use one of those. Can’t be many like that out there.

[steve1071]

I saw that, cracking find.

What did it go for in the end?

[Hipwell]

It looks very, er, agricultural in construction.

[Ronnie]

It's all there complete nothing missing, great find.

The original box will sell for £££'s on ebay.

[Toby]

Does anybody have an idea which type this one is?

[rpb203]

Looks like Speedwell to me?
Certain someone will know for sure.

[Toby]

I just found some pictures of a dry Speedwell one following your comment Gary. Many thanks for that. The brackets do look the same, however the bar has a dip in the middle to clear the exhaust. Could this have been an earlier one then?

[rpb203]

The one on my Mk1 Race Marcos was the same as that with no dip for the exhaust.