graearea Posted February 27, 2023 Share Posted February 27, 2023 my cage should be here the next week. anyone near london got one of these? from what I understand I have to drill out a few hundred rivets on the inside skin and then re-rivet them. can I get away with not doing this? Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 28, 2023 Share Posted February 28, 2023 I've fitted a cage, I've actually had three different ones on my imperial chassis car. I now have a tall Safety Devices cage.It would take me an age to type out 'how to' but happy to talk you through how I did it. If you PM me your contact details and a time when its convenient I'll give you a call.RegardsIanPS - I think its best to ease off the interior side panels by drilling out a few rivets, so you can find the threaded bosses in the chassis. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 28, 2023 Share Posted February 28, 2023 When you say trackday are you meaning the Roadsport or one of the SLR versions, early (with Z plates), later or easy in,The early SLR had mounts on the cage which are best changed as the were tubes and slight misalignment lead to cross threading, Arch changed the m to the later version for a small feeYou are best partially removing the inner panel to accurately drill out the mount holes Link to comment Share on other sites More sharing options...
graearea Posted February 28, 2023 Author Share Posted February 28, 2023 neither, https://caterhamparts.co.uk/rollcages/7080-rollcage-trackday-for-s3-windscreen.htmlI'm hoping to get a rough approximation of the holes so that I can try a pilot hole and don't have to do the partial removing of the inner skin. I don't really want a load of rivets bouncing around inside the tubes but maybe I'm overthinking it... Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 28, 2023 Share Posted February 28, 2023 https://caterhamparts.co.uk/rollcages/7080-rollcage-trackday-for-s3-windscreen.html Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 28, 2023 Share Posted February 28, 2023 A squirt of waxoil usually sticks the loose rivets down! Link to comment Share on other sites More sharing options...
Ed White Posted February 28, 2023 Share Posted February 28, 2023 Not sure how, but I fitted a tall version of one of those without removing any rivets?Got it on by myself in a morning. Sounds like I was lucky. Two bolts up into it where the shocks mount, the two to the rear tub, and two through bosses in the chassis just below the screen. Link to comment Share on other sites More sharing options...
Ivaan Posted February 28, 2023 Share Posted February 28, 2023 If you use a small round magnet, like one of those retrieving tools, you can find the location of the holes in the chassis. The magnet sort of self centres at the hole location. Certainly good enough to locate a pilot hole. Worth a try before drilling out rivets. Link to comment Share on other sites More sharing options...
graearea Posted February 28, 2023 Author Share Posted February 28, 2023 shouldn't I be able to put the cage to where it should sit and then just stick a hole in where it _should_ mount?I can give the magnet trick a try. I appreciate that it'll take a bit of persuasion to fit perfectly. Link to comment Share on other sites More sharing options...
graearea Posted March 3, 2023 Author Share Posted March 3, 2023 OK, so progress so far.I de-riveted maybe 6 rivets around where the bolt goes through. you can pry it back and see the threaded boss, drill some pilot holes and then use a step drill to get it right. all good.not sure about the size of bolt that's needed yet, I think it's old-school but it has a 8mm holding the front legs in place now.unfortunately there's clearly a problem. the inserts that go into the (extremely rusty and now swimming in dinitrol) chassis mounts are 1.5" long. the inserts on the old FIA bar are 1".(pre-cleaning and rustproofing)this means that the new bar sits' on the bottom of the insert instead of where it _should_ sit which is on the chassis.I'm a little unsure what to do. any ideas? apart from ringing caterham and asking them. it also has Metric threaded bosses in it (which I can live with), but I'm glad I didn't apply the uggaduggas (not that I would). wondering if I can get my mirror under the bar.I already love how it looks. Link to comment Share on other sites More sharing options...
simon_h Posted March 3, 2023 Share Posted March 3, 2023 One of the quirks is that metric bars will fit imperial frames with a spacer as they have a shorter stub but yours seems not that way? Definitely not a spacer jammed in the hole? Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 3, 2023 Share Posted March 3, 2023 Forward fixings are 7/16th UNF (seatbelt size)What age is your car? Imperial Chassis have a deep recess. Link to comment Share on other sites More sharing options...
graearea Posted March 3, 2023 Author Share Posted March 3, 2023 it's a 2006 factory built. I was under the impression as it has a chassis number stamped on the seatbelt boss behind the driver it is an imperial.... seems I may be wrong. anyone know a good solution beyond selling the cage at a loss and paying the newly inflated price for a metric?definitely no spacers in there. just rust.... Link to comment Share on other sites More sharing options...
Drumster Posted March 3, 2023 Share Posted March 3, 2023 I've just measured the length of the threaded stud on an imperial FIA bar that goes into the bucket on my 1992 imperial chassis and it is the same as your photo, 1 1/2". This does suggest that your original FIA bar is imperial and your chassis is metric. I don't know whether you purchased the trackday cage new or 2nd hand, but if 2nd hand I wonder if the cage which is a special order was specified to be imperial by the original purchaser?The chassis changed from imperial to metric around 2006/07 I believe. Link to comment Share on other sites More sharing options...
graearea Posted March 3, 2023 Author Share Posted March 3, 2023 I ordered it imperial as I thought it was an imperial chassis. :( clearly I've ****** up.seems I read the wrong advice on the internet......bugger.anyone want an imperial trackday cage? (*Edited by moderator) Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 3, 2023 Share Posted March 3, 2023 Drill, tap and careful application of an angle grinder??How deep does the threaded hole go? Link to comment Share on other sites More sharing options...
simon_h Posted March 4, 2023 Share Posted March 4, 2023 If your car is factory 2006 then it would have been metric. The engine bay diagonals are possibly the easiest way to have checked. I'd think about removing the excess from the boss and making the hole deeper. The cage will have 7/16 unf threads in I expect unless they have commonised to metric on those newer style cages? At least yours is designed to take a full head bolt so you don't need to get a thin head bolt like on imperial cars Link to comment Share on other sites More sharing options...
Doc007 Posted March 4, 2023 Share Posted March 4, 2023 Now you have cage I'd advise getting a 14" Longacre mirror that tuck up out of the way and gives an amazing panoramic view of both sides and rear. And when you put an aeroscreen on you don't need another mirror. Link to comment Share on other sites More sharing options...
Leadership Team Shortshift Posted March 4, 2023 Leadership Team Share Posted March 4, 2023 Fitting imperial cages and rollover bars to metric chassis cars is commonplace. You will find that the cage 'stub' that fits into the chassis pocket is a solid piece that is threaded throughout its length. Simply arm yourself with a decent hacksaw and cut off the bottom 1/2 inch of the stub, check that the thread is fine (run a tap up it) and Bob's your uncle.James Link to comment Share on other sites More sharing options...
Drumster Posted March 4, 2023 Share Posted March 4, 2023 That's interesting, never knew that. As they say 'everyday's a school day'. Good news for OP Link to comment Share on other sites More sharing options...
graearea Posted March 4, 2023 Author Share Posted March 4, 2023 thanks James (and everyone else), I can stop sobbing now. I'll check the thread depth and break out my hacksaw and some black paint then I guess.Longacre is the plan, and some 3D printed brackets obvs. :DI was pretty disgusted to see the price of the real ones.J Link to comment Share on other sites More sharing options...
graearea Posted March 11, 2023 Author Share Posted March 11, 2023 OK. it's been a week and a pretty long journey but I'm good.firstly I ended up cutting a half inch off the bottom of the stubs. to do this I used a hacksaw rather than my angle grinder cos I was worried about making a real mess. to keep the hacksaw straight I printed off some 1" guides:they worked really well to keep it all straight.there was about 5mm of thread even though there was another 10mm of hole and I was left with the option of getting a 3/8 tap and tapping it, and just having my local motorbike engineer drill it out with a 9mm metric and tap it to 10mm. so that's what I did. it is now a metric rollcage for my metric chassis.then it was just a case of.... re-riveting the holes. widening all the holes for the cage again as the cage is completely different left to right, swearing at it a lot, spraying loads of anti rust into the holes and.... screwing it all back together.I don't have any copperslip so I'll go grab some tomorrow and then I can put the suspension back together.I also added some 3D printed 1mm rubber gaskets in between the chassis and cage to stop water ingress, and a shitload of dinitrol for when it does.I ended up buying and discarding loads of imperial boltsanyone want a trackday rollbar? it'll be in For Sale pretty soon. I'll even chuck in a gopro mount and some rubber gaskets... Link to comment Share on other sites More sharing options...
7 wonders of the world Posted March 11, 2023 Share Posted March 11, 2023 2006 was the change over year, I was given the option of Imperial or Metric..... naturally I went for one Imperial Link to comment Share on other sites More sharing options...
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