Custom Anti Roll Bar- Cheap opportunity!

corazon

corazon

Well-Known Member
I'm in correspondence with Coilsprings about doing an uprated anti roll bar and I thought I'd pick your collective brains!
I measured what I thought a standard bar on a stripped car yesterday, and it was 22mm. Which has confused me somewhat after speaking to Brenten about his custom made one, which is also 22mm..
I know the Classeparts one is 25mm, so this must have offset hex ends correct?
Could anyone with a classeparts one let me know the relevant dimensions?
Thanks
Jim
 
Re: Custom Anti Roll Bar

So from what I've read, the one I measured was either non standard or I made an error measuring :?
I've gathered from previous posts that a larger round bar upto 25mm needs 19mm hex ends offset to allow correct fitment and function.
But can anybody tell me the length each hex end section should be?
Thanks
Jim
 
Re: Custom Anti Roll Bar

Hi Jim

I have just measured mine and it's 25.4mm in diameter (that's an inch to you young'uns)

The hex has been machined onto the last 14cms, or thereabouts; difficult to get in there to measure exactly.

The hex is dead centre, with no offset.

Hope this helps

Richard
 
Re: Custom Anti Roll Bar

Thanks for taking the time to measure yours Richard :oops: :LOL:
That's interesting about no offset, just to clarify you have the classeparts one don't you? And it's been on for a number of years/miles too hasn't it?
The guy who fabricated Brenten's one in Australia made a big deal about it being offset and not exceeding 24mm if I remember correctly...
Thanks again
Jim
 
Re: Custom Anti Roll Bar

corazon said:
Thanks for taking the time to measure yours Richard :oops: :LOL:
Click to expand...

I took a picture of it too :oops:



Yes it is a Classepart's one and I fitted in back in Feb 2009, so been on there a while. It completely cured the lurching effect when entering a sharp corner or roundabout, so very pleased with it.

It did go rusty very fast, so when I rebuilt the car, I painted it with some silver engine enamel.

Richard
 
Re: Custom Anti Roll Bar

That photo is very helpful thanks Richard.
Coilsprings use Chrome Vandium, Silicon Chrome or Titanium Alloy. I'll get quotes for each material, although I'm sure titanium will be pricey :shock:
Jim
 
Re: Custom Anti Roll Bar

Hi Jim.
My bar hexends measure about 70mm.
Basically just enough hex section to fit into the mounting points with 5mm or so each side for margin.
Dennis Trigg was primarily concerned that the bar did not foul the firewall or the suspension hardware mounts nearby. (If that what you call them).
22mm is the widest diameter you can go before you need to machine off centre.( Apparently)
 
Re: Custom Anti Roll Bar

Again thanks to you Brenten for measuring yours.
In no way disregarding Dennis' cautious approach, I think overall it will be easier and perhaps cheaper to fabricate one like Quattro's which has had years of proven service.
Can we agree it might just be that the classeparts one has 14cm (double the length) of hex which clears the potential fouling points? Therefore negating the need to offset the hex section..?
Jim
 
Re: Custom Anti Roll Bar

corazon said:
the classeparts one has 14cm (double the length) of hex which clears the potential fouling points? Therefore negating the need to offset the hex section..?
Jim
Click to expand...
I think that is precisely the case.
 
Re: Custom Anti Roll Bar

Somebody that knows these things, please help clarify for me...
Working on the assumption that a chain is only as strong as it's
weakest link, surely that long hex bit machined on that roll bar
has effectively given it the same characteristics of a 19mm hex
bar?
 
Re: Custom Anti Roll Bar

I do not claim to know these things.
Guessing, I would imagine that what you say applies to a point...that being the end points at anchor and any additional section of 19mm hex...however as loads are necessarily transferred from end to end, the extra mm of diameter throughout the bar length thus provides the additional twist (torque?) resistance to said loads...thereby doing its stated and desired role of providing roll resistance.
 
That's some in depth info there Ron, good bedtime reading.
I've had a reply from Coilsprings after giving the specifications talked about. 25mm diameter round bar, 14cm length hex ends (19mm diameter).

Ok, for us to obtain the material, have the ends formed, heat treat, shot peen and deliver, prices as below

1 off £150.+vat

5 off £110+vat/ bar

10 off £95+vat/bar. 4/5 working weeks.

So if there were some other parties interested each bar could be had for as little as £114 delivered inc VAT.
Any takers??
They have not confirmed what material it would be made from for these prices, but i'm awaiting an answer. Most likely Chrome Vandadium?
Jim
 
I think I may be interested in one for Bruiser so please pencil me in & keep us informed. I'll rely on your research as the supplied information is likely beyond my ken.

Update: I've had a quick look & can unequivocally confirm my last statement. :LOL:
 
Re: Custom Anti Roll Bar

corazon said:
Can we agree it might just be that the classeparts one has 14cm (double the length) of hex which clears the potential fouling points? Therefore negating the need to offset the hex section..?
Jim
Click to expand...

The only possible fouling point would be the inner fixing for the top link, as the 14cm doesn't clear anything else. I found an old picture of mine, pre-rebuild but photobucket isn't working properly so I cannot put it on there. I am trying to upload it onto here :)



It doesn't clear the inner wing so I can only assume that it's there to allow a small amount of twist to take the pressure off the ends.

Richard
 

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Hi,

The rear anti-roll bar out of the Peugeot/Citroen 306/ZX range of cars is a cheap source of the correct grade of material to make a bar out of, the higher spec. cars have a 25mm dia bar in them, lower cars may have thinner one although I've never looked. The bar is pretty much the correct length and is easy removed from the donnor car as well.

Manufacture of our second bar is covered here:

http://p6v8.wordpress.com/2011/04/06/a- ... -roll-bar/

As those that follow our antics in our car will know this Anti Roll bar is well tested and both durable and effective.

You should be able to acquire the bar in a breakers for next to nothing and the machining is straight forward, luckily Gavin is a dab hand at these things and has the equipment in his garage. If you have a local tame machinist this should all be do-able for well less than £50.

Tim
 
Richard I was measuring the 14cm against a standard one today and wondering if you'd meant it should clear the inner wing or not.. So that answers that :D
Tim, that sounds like the cheapest option. Not plug and play in terms of time/modification, but very tempting to go that route for the price..
So Dave with you in that makes 4 of us..
Coilsprings replied again re material:
"Material will be 735A51 Chrome vanadium bars."

Jim
 
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