morrag
Hero Member
Karma: 49
Posts: 2875
Carpe diem!
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« Reply #75 on: August 21, 2017, 07:26:15 PM » |
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It will depend on what caster/camber and front loading you are intending Mr.C but there are some useful dims to be found on the Locost builders site, as they tend to use the same uprights. I usually to stick with what is generally acceptable for a Mk.4/5 Spitfire in such instances, but provided you are not too near the ball joint edge................. Morrag
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Beware the Ides of March, But!
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minimutly
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« Reply #76 on: August 21, 2017, 08:55:09 PM » |
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The balljoint edge is key - set it up as you have it at std ride height, remove the shock and swing it through max droop to full rebound, plus a bit. Then do it at full lock. Taking off the gaiters can help to see. If you need to you can tweek the balljoint angles at the arms before welding.
Thanks for the info on the hubs.
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stinkey
Hero Member
Karma: 93
Posts: 2757
I can't stop building stuff ?,but I'm slowing down
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« Reply #77 on: August 21, 2017, 09:48:58 PM » |
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I'd definitely modify /lower the ball joint mounting point..
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Backyard hotrodder,learnt by mistake,still learning ?
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the coppersmith
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« Reply #78 on: August 22, 2017, 11:40:01 AM » |
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Pulled it to bits and set it up at eye level, this is the lower ball joint, I fixed it to some decking mounted in the vice and got it level
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the coppersmith
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« Reply #79 on: August 22, 2017, 11:42:17 AM » |
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Then. I set it up as it will be in the car and mounted the hub and brake. For this I set the camber as zero. The middle of the ball joint is then at a 70 degree angle.
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the coppersmith
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« Reply #80 on: August 22, 2017, 11:47:11 AM » |
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then I moved the joint out as far as it go. Then in as far as it would go. Took all the angles and set it up mid point which is 85 degrees. This results in needing a spacer under the arm of the ball joint of 15mm. Or if I want to start with some negative I could shave it down a mill. or so. Glad I took this on and shared with you guys. Now it is nowhere near the "edge" I can get 15 degree positive and negative, so should be fine now  |
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« Last Edit: August 22, 2017, 11:50:47 AM by the coppersmith »
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the coppersmith
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« Reply #81 on: August 22, 2017, 11:49:13 AM » |
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then this :
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minimutly
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« Reply #82 on: August 22, 2017, 04:57:52 PM » |
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Are those points the pivot points (middle of the balljoint), or on a line allong the end of the arms? The correct one is the balljoint middle. I deally i would like to see some slope downward in the bottom arm or what would effectively bee the bottom arm in your drawing. More and more car makers have moved the balljoint down into the arm (remember the mini/1100 where the balljoint was in the hub?) i would think you have too much camber, 2 degrees would be max.
You are in the really complicated field of roll centres, scrub, wheel offset, and even bump steer once you get to rack width and height. Books have been written on it, but I would try to replicate the mazda as close as possible, since thats your hub
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the coppersmith
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« Reply #83 on: August 23, 2017, 03:34:27 PM » |
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yes they are centre of pivot. I was always told to keep the lower wishbone horizontal and the top slightly up when sat at rest. The 4 degree camber is a cock up. Unfortunately I cannot get a copy to allow the movement to be shown. It drops and rises and does not change the camber at all. This is all fiddling at present and nothing is hard and true. My next problem is trying to fix the dampers to allow for the weight of the engine etc. to get 50/50 split. I'm enjoying the challenge. Then on to the rack and bump steer.
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the coppersmith
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« Reply #84 on: August 24, 2017, 07:30:46 PM » |
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Big day at the coal face with a borrowed welder |
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the coppersmith
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« Reply #85 on: August 24, 2017, 07:31:33 PM » |
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Rolling, rolling,
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Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
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« Reply #86 on: August 24, 2017, 11:16:36 PM » |
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Wow! You'd never believe that's the rusty old heap we helped you pick up just a few weeks ago! Nice work Sir.
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On the last freedom moped out of Nowhere City.
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stinkey
Hero Member
Karma: 93
Posts: 2757
I can't stop building stuff ?,but I'm slowing down
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« Reply #87 on: August 24, 2017, 11:57:53 PM » |
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Looking cool
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Backyard hotrodder,learnt by mistake,still learning ?
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the coppersmith
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« Reply #88 on: August 25, 2017, 07:45:35 AM » |
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I have a mate who knew someone who was grit blasting an old building, dropped the chassis off to him. One hour later, all done for beer tokens, quick coat of Silverene to protect it and onwards. 4 corners now finished except the suspension, trying to work out how to preload it to guesstimate the position. Having a quiet day today rebuilding master cylinder and pedal box, stood at the bench in the sun
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Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
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« Reply #89 on: August 25, 2017, 08:42:33 AM » |
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 I can imagine you "accidentally" parking it in front of the building while he blasted!
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On the last freedom moped out of Nowhere City.
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