Adrian Saunders Posted May 28, 2019 Report Share Posted May 28, 2019 I was about to fit a 7/8” arb to my rotoflex mk3 as I assumed that all of the small chassis arb’s are interchangeable, in terms of fitting. I know that this combination is frowned upon but I wanted to try it anyway. As of about three hours ago I discovered that the u-bolts are bigger and don’t fit so now, with the extra work considered, am I wasting my time? If so, I have a 7/8” setup to sell/swap for an 11/16” setup. Link to comment Share on other sites More sharing options...
Clive Posted May 29, 2019 Report Share Posted May 29, 2019 Yes, the u clamps are bigger, but the holes inthe mounts can be redrilled easily enough, or even filed. However, a bigger front ARB will induce more understeer. You probably have enough of that already.... How does it drive without a front ARB? I found with stiffer springs on my Herald steering was fantastic without an ARB. If you are thinking of thicker, you really should try without too.... (curveball here. Not sure if the smaller ARB bushes could be drilled out so the std clamps could be used? If you have the old ones it may be worth a look) Link to comment Share on other sites More sharing options...
Ian Foster Posted May 29, 2019 Report Share Posted May 29, 2019 I have reverted to an 11/16" bar after using a 7/8" bar for many years on my Rotoflex GT6 Mk2. Without going into chapter and verse about why and when and who (me obviously) I confirm that the smaller bar it is much, much better! Ian 2 Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2019 Report Share Posted May 29, 2019 as an AR bar does little till there is any body roll its hard for me to grasp the extra 3/16" makes such a vast effect on handling, the supposed stiffer bar ( is it actually stiffer or just thicker to be more stable and resist setting) will give less toe in on turns than a and make it feel understeer, , the whole geometry settings have more detriment to handling than an AR bar i had a courier spring and thick bar and she ( Vit6) was very flat but on rails compared to the std set up . from what i see ?? the 217033 7/8" was introduced across many of the range , later not just swinger springs 1 Link to comment Share on other sites More sharing options...
Adrian Saunders Posted May 29, 2019 Author Report Share Posted May 29, 2019 9 hours ago, clive said: Yes, the u clamps are bigger, but the holes inthe mounts can be redrilled easily enough, or even filed. However, a bigger front ARB will induce more understeer. You probably have enough of that already.... How does it drive without a front ARB? I found with stiffer springs on my Herald steering was fantastic without an ARB. If you are thinking of thicker, you really should try without too.... (curveball here. Not sure if the smaller ARB bushes could be drilled out so the std clamps could be used? If you have the old ones it may be worth a look) 9 hours ago, clive said: Yes, the u clamps are bigger, but the holes inthe mounts can be redrilled easily enough, or even filed. However, a bigger front ARB will induce more understeer. You probably have enough of that already.... How does it drive without a front ARB? I found with stiffer springs on my Herald steering was fantastic without an ARB. If you are thinking of thicker, you really should try without too.... (curveball here. Not sure if the smaller ARB bushes could be drilled out so the std clamps could be used? If you have the old ones it may be worth a look) Hi Clive, I’ve not driven it yet. I got this arb a while ago as it was cheap, I couldn’t find a small one and, I wanted to get the car built. I knew about the understeer issue but not that the parts wouldn’t fit. Link to comment Share on other sites More sharing options...
Adrian Saunders Posted May 29, 2019 Author Report Share Posted May 29, 2019 6 hours ago, Ian Foster said: I have reverted to an 11/16" bar after using a 7/8" bar for many years on my Rotoflex GT6 Mk2. Without going into chapter and verse about why and when and who (me obviously) I confirm that the smaller bar it is much, much better! Ian Thank you Ian. I shall get an 11/16” bar. According to CC website, the 11/16” bar is fitted to all of these, as per the image. Is this correct? Link to comment Share on other sites More sharing options...
Qu1ckn1ck Posted May 29, 2019 Report Share Posted May 29, 2019 I think that you will find that only the 7/8" ARB is now available new from the usual suspects. Link to comment Share on other sites More sharing options...
NonMember Posted May 29, 2019 Report Share Posted May 29, 2019 32 minutes ago, Adrian Saunders said: According to CC website, the 11/16” bar is fitted to all of these, as per the image. Is this correct? AFAIK, the 11/16" was correct for all swing axle and Rotoflex, the 7/8" was only on the swing spring cars. Pete may be right about "later" cars also having a 7/8" one but those are either a lot heavier (2000 saloon) or have a live rear axle (Dolomite). Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2019 Report Share Posted May 29, 2019 I would agree the 207093 11/16" bar is not available all superceeded by the 217033 7/8" Canley may have updated the part number link but on 13/60 it only lists 217033 there no ref to the small one You may find a second hand one Heres some clues on roll stiffness to chew over http://auskellian.com/paul/links_files/springs.htm There was a previous post a while back about the small bar being designed with a set in in it as they all show up as twisted, the 7/8 is always supplied as flat as you would expect Pete Link to comment Share on other sites More sharing options...
Qu1ckn1ck Posted May 30, 2019 Report Share Posted May 30, 2019 Any tips on how to make fitting Polybushes to the ARB an easy job ? Link to comment Share on other sites More sharing options...
Adrian Saunders Posted May 30, 2019 Author Report Share Posted May 30, 2019 7 minutes ago, Qu1ckn1ck said: Any tips on how to make fitting Polybushes to the ARB an easy job ? Got to be a KY jelly job. 1 Link to comment Share on other sites More sharing options...
Badwolf Posted May 30, 2019 Report Share Posted May 30, 2019 We have touched on lube for bushes with various thread drifts (!!). When I spoke to one of the Polybush team at the NEC restoration show in March, she said only use a smear of washing up liquid to prevent the formation of a grinding paste. Other here have used numerous other rubber greases, so its try it out and hope for the best. What ever 'slips' your boat so to speak. I mentioned to her that R*****s had tried to sell me some sort of grease when I ordered my Polybushes and she went over to their stand to sort them out. I made a hasty exit!!! 1 1 Link to comment Share on other sites More sharing options...
Adrian Saunders Posted May 30, 2019 Author Report Share Posted May 30, 2019 5 hours ago, Badwolf said: We have touched on lube for bushes with various thread drifts (!!). When I spoke to one of the Polybush team at the NEC restoration show in March, she said only use a smear of washing up liquid to prevent the formation of a grinding paste. Other here have used numerous other rubber greases, so its try it out and hope for the best. What ever 'slips' your boat so to speak. I mentioned to her that R*****s had tried to sell me some sort of grease when I ordered my Polybushes and she went over to their stand to sort them out. I made a hasty exit!!! I’ve not considered that before. Has anyone seen significant wear in the bush region on standard or Polybush installations? Link to comment Share on other sites More sharing options...
GT6M Posted June 1, 2019 Report Share Posted June 1, 2019 laal tyres, no very grippy, esp wid 2 degs positive camber pottering aboot speeds / driving, then small bar fine v stickty tyres, or bigger better tyres will result in moer roll, What happens is yer tyres then bite, this then causes grip induced roll, pain in the butt wid 60 TW tyres but will also give too much roll on ordinary road tyres if gon t, 205s an 2 deg neg camber Alott is dependant on yer tyres, can be alott of roll like 30 sih degs roll on a hard 70-90 deg corner Im running 1200LB springs up front wid a 7/8th bar to compesate, and a an adjustable front TR6 bar ont rear, t even it up a wee bit tried the wee bar on fronts ,but roll was still alott. horses for courses summary pottering / normal drive, oe wee roll bar quite adequate honk,n on, bigger tyres, stickee tyres , neg camber, then a biggggg no no M Link to comment Share on other sites More sharing options...
Adrian Saunders Posted June 1, 2019 Author Report Share Posted June 1, 2019 Anyone got an 11/16” bar for sale? Link to comment Share on other sites More sharing options...
Dick Twitchen Posted June 2, 2019 Report Share Posted June 2, 2019 Adrian, Just checked, I have one you are welcome. PM sent. Dick Link to comment Share on other sites More sharing options...
Adrian Saunders Posted September 3, 2019 Author Report Share Posted September 3, 2019 Good morning Dick, I collected the ARB yesterday, thank you very much. I forgot to get the correct mounts and Canley’s are closed this week. Waiting for delivery from James Paddock now! Whilst talking to Lesley and her husband Roger yesterday, we realised that my two boys sat in Lesley’s Stag at Solihull “Fun in the Park” a couple of years ago. Picture attached. We plan to visit the event this year. It’s only small but there are some great cars there. Hopefully my GT6 one day! Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 3, 2019 Report Share Posted September 3, 2019 Sorry...was delayed by reading the long pause at the bottom of Marcus' post. I wonder why Polybushes always supply a tube of grease with their bushes, if one of the team states they don't need any? (J Y Kelly... wasn't he the inventor of Irish vaseline?) 1 Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 3, 2019 Report Share Posted September 3, 2019 You can read Marcus's posts?!! respec. db Link to comment Share on other sites More sharing options...
Adrian Saunders Posted September 5, 2019 Author Report Share Posted September 5, 2019 I’m seeing about 3/4” twist in the bar. Does that sound about right? Link to comment Share on other sites More sharing options...
JohnD Posted September 6, 2019 Report Share Posted September 6, 2019 This is an interesting point. Some say ..... As La Clarkson used to , that Triumph fitted biased ARBs intentionally, as their sports cars would usually have a solo driver (sad idea). Others say this is nonsense, cornets go both ways, we're not driving on American ovals. Gaydon may hold the answer, but I have yet to get there and do the research in their records. John Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 6, 2019 Report Share Posted September 6, 2019 until we get sight of a orig drawing of the small bar the too and fro will continue debate one asks why would you induce a twist, ...........to compensate road camber ? or what , makes no sense the LHD has the same AR bar so that doesn't add up {Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 9, 2019 Report Share Posted September 9, 2019 On 06/09/2019 at 15:22, Pete Lewis said: one asks why would you induce a twist, ...........to compensate road camber ? or what , makes no sense the LHD has the same AR bar so that doesn't add up None of the workshop manuals or other reference books mention any direction of fitting, which would be important if any kind of bend was meant to be there, otherwise fitting it incorrectly is bound to have an adverse effect on handling. Anyone selling new items - Jigsaw Racing for one - show a completely flat bar. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 9, 2019 Report Share Posted September 9, 2019 in all my years the only time there's a designed quirk is for a race circuit , road going camber and antiroll are all neutral if cars had odd spring heights to compensate for road camber then the AR would need to copy , but our small chassis are not in that league. flat .... just has to be flat pete Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now