Anti-roll bars

[tryphon]

A question to those running the Group 4 style sliding adjuster anti roll bars on replicas or originals:
What diameters front and rear are you using?

The original Stradale with has 3-point adjustable bars f/r which are both 19mm. It seems Group 4 cars used a smaller diameter bar at the front. Any thoughts?

[Sando]

Hi Tryphon
The Hawk ones I have are 14mm front and 16mm rear.

I ran without the front bar at Abingdon but with 500Lbs springs. - very enjoyable handling but could go stiffer for serious tarmac use. Next step is to try the same set up but with the front ARB.

Rear springs are 350Lbs with ARB set about 50mm from end, again could go stiffer. I would guess my Volumex engine is slightly lighter than the dino though?

Cheers
Rob

[tryphon]

It seems Group 4 cars used: 14, 15, 16 front and 15, 16, 18 rear fro rallying.
Track antiroll bars were: 22mm front and 19, 20 rear.

I would have thought the front one should be bigger than the rear one but it seems not.

Are the Hawk antiroll bars similar to the original Group 4? Do they use the same sliding adjusters (see pic)?

[mogul_x]

Tryphon,

The Hawk anti-roll bars are very similar to the Gp.4 anti-roll bar in the picture. Not identical, but nearly.

[Randle Roberts]

I just measured the one I got from Maglioli years ago and it is 16mm. The front ends are so light on the race cars I would think you wouldn't need all that stiff a front anti-roll bar. I found a firm in Florida that can duplicate the roll bars but haven't sent them one yet.

[Sando]

Hi. just snapped this.
Yes the Hawk fittings are very similar, this one uses male rose joints on the drop links (over 10 years old so may not be the current spec) Why not drop Gerry H. a line?
Rob

[Sando]

And the rear one is much the same.
R :cool:

[tryphon]

I just measured the one I got from Maglioli years ago and it is 16mm. The front ends are so light on the race cars I would think you wouldn't need all that stiff a front anti-roll bar. I found a firm in Florida that can duplicate the roll bars but haven't sent them one yet.

Randle is your car tarmac spec? If yes what's the diameter of the rear antiroll bar? Roberto is having some remade, probably available in a month.

[tryphon]

Hi. just snapped this.
Yes the Hawk fittings are very similar, this one uses male rose joints on the drop links (over 10 years old so may not be the current spec) Why not drop Gerry H. a line?
Rob

Thanks for the pics. Yes it looks very similar. What diameters are they? I know Gerry doesn't hang around here a lot, does anyone know whether they are identical to the originals before I bother Gerry?

[Sando]

..........What diameters are they?................

:confused:
see above :) ............The Hawk ones I have are 14mm front and 16mm rear........

Rob :cool:

[roger001]

Gerry is soon to make some uprated Front ARBs having seen my car at brands last weekend, these will prob be the same thickness as the rears (16mm), I will try them out and let you know how we get on, at present using the standart Front ARB I have had to increase the front springs to 1100 lb/in to eliminate "lurch" on turn in.

[Randle Roberts]

Tryphon,

The rear bar is 18 mm. I am not sure if this is a tarmac bar or not.