The Triumph Dolomite Club - Discussion Forum

I have been given hope to Believe that the rear anti roll bar has different types and not all standard! Is it possible that my 1974, 1850 has a different roll bar to later cars?
Rich

My 1973 sprint has a thicker anti roll bar than my 1500's so there might be others that are different.

The parts catalogues show the same part number (217661) except for the 1500fwd (216588).

Also differences in the bulge what clears the prop.

Jeroen

soe8m wrote:Also differences in the bulge what clears the prop.

Jeroen

Jeroen, is this likely then that mine being a 74 that the roll bar is shallower where it's dished for the prop?
Cheers Rich

I'm not sure what does belong to what. I did discover when they were on a pile to sort out and not traceable under what car they were.

Jeroen

I believe the early Sprints had the thicker ones. When it was reduced I have no idea.
Early and late 1850's have the same, and the later Sprint is the same too.

Jonners

I think the thicker early Sprint bar was a mistake proven by track experience. The race cars had "a bit of wire that looked like a roll bar" to meet homologation regs cos that worked better than the stock one. Later production benefitted from this and a thinner bar was used.

The Carledo as originally built by Triumph had no roll bars at all, I quickly fitted a front one after build which helped enormously and later when a rear one became available I fitted that (a thin one from a very late Sprint) TBH I don't think it made a lot of difference, a marginal improvement which may be as much to do with adding weight to my too light rear end as anything else!

Steve

Carledo wrote:I think the thicker early Sprint bar was a mistake proven by track experience. The race cars had "a bit of wire that looked like a roll bar" to meet homologation regs cos that worked better than the stock one. Later production benefitted from this and a thinner bar was used.

The Carledo as originally built by Triumph had no roll bars at all, I quickly fitted a front one after build which helped enormously and later when a rear one became available I fitted that (a thin one from a very late Sprint) TBH I don't think it made a lot of difference, a marginal improvement which may be as much to do with adding weight to my too light rear end as anything else!

Steve

Owing to the availability during the early-1980s of second-hand anti-roll bars, I first fitted a Dolomite Sprint rear anti-roll bar to my 1974 Toledo 1300, followed several months later by a Dolomite Sprint front anti-roll bar, for which I needed to make a steel bush, because one was missing. The rear one on its own made a noticeable improvement.

I can't figure out what the rear ARB actually does. It doesn't attach to the body so how does it reduce body-roll?

Because it ties the radius arms together albeit a bit weak, when one wheel goes up the other will too and hence reduce roll. I was under the impression that the racers found it handled better if they removed the rear altogether when not forced to by rules.

trackerjack wrote:Because it ties the radius arms together albeit a bit weak, when one wheel goes up the other will too and hence reduce roll. I was under the impression that the racers found it handled better if they removed the rear altogether when not forced to by rules.

I thought they were called trailing arms!?!

Anyway, I reckon I've had more than my money's worth out of 2 x £5·00 front & rear anti-roll bars; the best £10 I ever spent on the car!

naskeet wrote:

trackerjack wrote:Because it ties the radius arms together albeit a bit weak, when one wheel goes up the other will too and hence reduce roll. I was under the impression that the racers found it handled better if they removed the rear altogether when not forced to by rules.

I thought they were called trailing arms!?!

Anyway, I reckon I've had more than my money's worth out of 2 x £5·00 front & rear anti-roll bars; the best £10 I ever spent on the car!

On lots of Dollies they are called cracked arms

trackerjack wrote: On lots of Dollies they are called cracked arms

What do they call heavily strengthened/fabricated arms: Bingo wings?

Karlos wrote:

trackerjack wrote: On lots of Dollies they are called cracked arms

What do they call heavily strengthened/fabricated arms: Bingo wings?

The trick is to only polybush one end of the trailing/radius arm. heavy reinforcement is not a very good option either since it just moves the sresses into the body and/or the axle case and promotes cracks there instead. Fabricating your own might be an idea, but it would be fraught with theoretical design and material problems and if too strong would give the same results as reinforcing standard ones. In my case it would also be a mod too far as only my stock pattern suspension and original design steering stands between my car and a BIVA!

MY Toledo is still on its original 1973 trailing arms and despite being subjected to more than twice their design horsepower, my exuberant driving style and innumerable "burnouts" via a brake line lock, are still coping admirably - but I took the advice of the old hands and only polybushed the axle ends!

Steve