Paul Posted March 22, 2006 Share Posted March 22, 2006 I've got the opportunity to have some new trailing arms made for the back of my 110 for free, but it needs to be done by someone remote me, so he needs details of the length and angle I want them bent to. Soooo...can anyone tell me what angle they should be bent, where along the length the bend should be and what the resulting length should be? This is assuming a 2" lift from standard. I know I could probably work out the angle roughly by eye to get the chassis end bush unstressed, but I was hoping someone might have already done this for a 2" lift and save me from guessing wrong. The arms are going to be made from 44mm dia solid bar (because that's what he's offering for free) if that makes any difference. Paul Link to comment Share on other sites More sharing options...
simonr Posted March 22, 2006 Share Posted March 22, 2006 I've got the opportunity to have some new trailing arms made for the back of my 110 for free, but it needs to be done by someone remote me, so he needs details of the length and angle I want them bent to. Soooo...can anyone tell me what angle they should be bent, where along the length the bend should be and what the resulting length should be? This is assuming a 2" lift from standard.I know I could probably work out the angle roughly by eye to get the chassis end bush unstressed, but I was hoping someone might have already done this for a 2" lift and save me from guessing wrong. The arms are going to be made from 44mm dia solid bar (because that's what he's offering for free) if that makes any difference. Paul Don't know precisely, but lets work it out! Let's assume standard arms are X cm long and that on a normal height vehicle they are horizontal. If you lift it by 2", you have a right angle triangle (roughly) with one side 5cm, one side X cm, so by pythagorus, your new length Y will be: Y = Square root ((5 x 5) + (X x X)) The bend will not be absolutly at the chassis end (probably 10cm away towards the axle or so). Lets call this distance away from the chassis mount Z. The angle of the bend A will be: Tan A = 5/(X - Z) or A = ArcTan(5/(X-Z)) degrees If you measure the length of your existing arms, from the middle of the chassis bush to the middle of the axle bush (the two points around which it rotates), I or someone else will calculate it for you if you like. Si Link to comment Share on other sites More sharing options...
dollythelw Posted March 22, 2006 Share Posted March 22, 2006 send me your email address Paul Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted March 22, 2006 Share Posted March 22, 2006 Y = Square root ((5 x 5) + (X x X)) The bend will not be absolutly at the chassis end (probably 10cm away towards the axle or so). Lets call this distance away from the chassis mount Z. The angle of the bend A will be: Tan A = 5/(X - Z) or A = ArcTan(5/(X-Z)) degrees The other 'low tech' option is : a chalk mark on the floor, a pipe bender, 4 grunts 17 pumps and a f*rt then check the bend Nige Link to comment Share on other sites More sharing options...
landyliam Posted March 22, 2006 Share Posted March 22, 2006 how about a set of these Link to comment Share on other sites More sharing options...
Paul Posted March 23, 2006 Author Share Posted March 23, 2006 Don't know precisely, but lets work it out!Let's assume standard arms are X cm long and that on a normal height vehicle they are horizontal. If you lift it by 2", you have a right angle triangle (roughly) with one side 5cm, one side X cm, so by pythagorus, your new length Y will be: Y = Square root ((5 x 5) + (X x X)) The bend will not be absolutly at the chassis end (probably 10cm away towards the axle or so). Lets call this distance away from the chassis mount Z. The angle of the bend A will be: Tan A = 5/(X - Z) or A = ArcTan(5/(X-Z)) degrees If you measure the length of your existing arms, from the middle of the chassis bush to the middle of the axle bush (the two points around which it rotates), I or someone else will calculate it for you if you like. Si Thanks Si, I think I must have been on the right track then using pythagoras theorem. My existing arms are approx 30", lets say 76cm. So for a 2" lift, the extra lenth required would be naff all then, less than ¼" ? Unfortunately the calculator I have here at work can tell you the value of an annuity in 25 years time, or the internal rate of return but doesn't have any scientific functions, so can you help me out with the angle? Paul Link to comment Share on other sites More sharing options...
rick Posted March 23, 2006 Share Posted March 23, 2006 or, you could just get them made dead straight and instal a Rangie Spares/Les Richmond Automotive taper shim between the chassis outrigger and the bush, or use one of Rangie Spares new 15* offset angled bush. Just to throw more options up and give you more decisions to make Link to comment Share on other sites More sharing options...
Paul Posted March 23, 2006 Author Share Posted March 23, 2006 or, you could just get them made dead straight and instal a Rangie Spares/Les Richmond Automotive taper shim between the chassis outrigger and the bush, or use one of Rangie Spares new 15* offset angled bush. Just to throw more options up and give you more decisions to make The taper shim thingy from Rangie Spares was exactly what I was going to do Rick, but they cost about $100. I can get the new ones made up and set at whatever length I want, and bent to whatever angle I want, all for free, so long as I tell him length and angle etc. I'm thinking why pay $100 if I can get them bent when they're made? Yes I know, I'm starting to sound like an accountant or something. Paul Link to comment Share on other sites More sharing options...
rick Posted March 23, 2006 Share Posted March 23, 2006 <snip>Yes I know, I'm starting to sound like an accountant or something. Paul not at all, sounds like a decision any of us would make. Link to comment Share on other sites More sharing options...
Revor Posted March 23, 2006 Share Posted March 23, 2006 Since the Pinion Angle is Improper from the get go I usually make mine between 10 and 15 mm longer than stock after I bend them about 50 mm behind the leading edge of the tire about 15 degree so that you relieve some stress on the frame bushing and keep the arms out of the rocks.. Of course it depends on the application.. 110's are different.. Keith Link to comment Share on other sites More sharing options...
Turbocharger Posted March 24, 2006 Share Posted March 24, 2006 To improve the pinion angle at the propshaft, wouldn't you have to make the arms shorter, to pull the bottom of the axle forward and point the diff nose more towards the gearbox? Link to comment Share on other sites More sharing options...
Paul Posted April 3, 2006 Author Share Posted April 3, 2006 Well, they're done. In the end I kept them straight and opted to try out some offset bushes. If they don't do the job properly, then I can get the arms bent at a later stage. Here they are before fitting. Being 44mm solid bar they're fairly heavy, but no more than the front hockey sticks. Some of the remains of the skinny original arms show for comparison: The offset bushes compared to standard: The new arms installed: The bush angle looks about right now: Hopefully they should do the job. If I bend these then I'm in real strife. Paul Link to comment Share on other sites More sharing options...
Mark90 Posted April 3, 2006 Share Posted April 3, 2006 Ooo they look nice B) Link to comment Share on other sites More sharing options...
cols110 Posted April 3, 2006 Share Posted April 3, 2006 Hmmmmm, very nice. Link to comment Share on other sites More sharing options...
LR90 Posted April 3, 2006 Share Posted April 3, 2006 Looks neat and those bushes are a nice alternatice to cranked arms (unless of course you're cranking them to get them up out the way of rocks). Link to comment Share on other sites More sharing options...
orange rover Posted April 3, 2006 Share Posted April 3, 2006 like the offset bushes, neat alternative to new arms, who sells them? Link to comment Share on other sites More sharing options...
Paul Posted April 4, 2006 Author Share Posted April 4, 2006 like the offset bushes, neat alternative to new arms, who sells them? They've been made up specially by an Australian mob, Les Richmond Automotive in Melbourne. Sorry, don't know if you can get them anywhere in Blighty. Link to comment Share on other sites More sharing options...
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