spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Mar 30, 2018 21:16:54 GMT
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I did try that kind of setup last year, but I couldn't get it to evenly brake: using hydraulics this year, so perhaps that'll be easier to get two calipers working. it'll be pretty much the same system as on my MG
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ChrisT
Club Retro Rides Member
Posts: 1,637
Club RR Member Number: 225
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Mar 30, 2018 21:53:02 GMT
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If you could source a ride on lawnmower diff you could fit that and replace the chain wheel with the brake disc. Or I'm sure I read somewhere there's a way of making a diff out of a couple of bike freewheel sprockets......
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While I get that you like the disk option (I would too on a go kart), as this is a gravity powered machine used very briefly, I would build it using a dead rear axle, with drum brakes, as you are unlikely going to see brake fade in a 30 sec run. Then you can either bolt the wheels to the drum, or weld the wheels to the outer drum.
Also, because you don't need an accelerator pedal, you could make a left and right brake pedal, so each wheel can be independently braked to help with yaw/steering. just make the pedals small enough so you don't have to use them to brace yourself while going around corners.
Or am I overcomplicating it?
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Mar 31, 2018 16:54:43 GMT
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I hadn't thought of doing it that way, though a rear axle would be quite a bot of weight though thinking about it, my little trailer tent has braked wheels and each side is standalone, so that could be an option.
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Mar 31, 2018 21:24:27 GMT
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aren't brakes for pussies? what's wrong with a lump of 4x2 on a pivot to heave up against the tread on one of the rear tyres? worked for us as kids...most of us survived!!
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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aren't brakes for pussies? what's wrong with a lump of 4x2 on a pivot to heave up against the tread on one of the rear tyres? worked for us as kids...most of us survived!! thats what I used last year and it was awful I need to be able to stop at the end of the run, last year I had to drive into haybales to stop, was a bit alarming!
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I hadn't thought of doing it that way, though a rear axle would be quite a bot of weight though thinking about it, my little trailer tent has braked wheels and each side is standalone, so that could be an option. Actually, if you used a stub axle set up, it wouldn't be much weight at all. pretty much the same as what you are running already on the front. It's not like it's got to hold the weight of a monocoque or anything substantial. If you went to a breaker, you could probably pull the hubs off the rear of a a cheap small FWD car for next to nothing. I'm considering challenging a few mates to a scrapyard challenge/buildoff so I should probably keep these ideas in the back of my head.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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I've decided to use what I have to hand for now, hopefully enough time to test it and change it if it's no good
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
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Club RR Member Number: 167
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So, todays fiddling: Outriggers added to support the bodywork, which will be thin ply probably Rear wheels on pillow bearings, fitted underneath, as I realised that if I fitted thgem on the top, the kart would have reverse rake and look a bit odd better view different view second pillow bearing added, to support both ends, and the disk carrier in place too. Ive decided that as these axles are now so short, I can deal with 'wasting' them by welding the wheels on. Caliper in rough postion, no brackets yet Dug out my brake spares, I'll be needing a flare kit and spare pipes I may have enough parts to run a brake light too
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Got quite a lot done this weekend Staring with brake stuff: Brake kit turned up on Friday along with the second Chinese moped caliper Made a shelf for the three way union Then fitted it on the other side Routing the pipes through the 'chassis' because a: they are less likely to be in the way of the floor and B: because why not Flaring tool seems to work OK, though it has that 'it might snap at any moment' feel to it Other side also routed, will be trimmed to fit when the caliper is fitted Another vierw Feed to the brake lever. Note the tightly kinked right angle bend is some old tube i'm using as a guide
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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And got the first lightbar fitted up, which turned out a lot better that I imagined it would! As seen earlier in the thread, I have a load of flashy led lights, these are for two light bars, one at the front, and one at the back, each 'bar' having two tubes and four lights. Mock up with a short length of tube. Annoyingly, the diamerts of the lights was almost exacly that of the tube, which was the closest I could find while trawling DIY shops today with a test light and a ruler, so they are attached with a plywood spacer. In action! these flash. Spraying pipe and pretty much done The wiring will go to a switch panel and a sealed battery, all 12v stuff. Mocked up, there will be side panels and a roof when it's done Dog is desperatly hoping i'll throw his tennis ball. If you squint a bit, it should look something like this:
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Last Edit: Apr 8, 2018 19:45:12 GMT by spiny
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getting there....
watched a bit of last years red bull soap box on the tv the other day. there was a "mystery machine" van on there , it looked superb!
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Apr 14, 2018 20:39:52 GMT
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More progress today, weather is finally warming up Started on the second set of 'lights' Red rattle canned Attaching the LEDs flashers with a bit of plywood Spraying the center to look more likethe real thing Then added some more metal Dog still optimistically hoping I'll throw the ball Front bars are kinked to have the bonnet then windscreen profile back is sloped slightly it's now too big to easily go in my garage through the narrow side door, so I'm painting it all as it'll live outside from now on. Post paint I ran out of square tube at this point, which is why its not got the other side Lights in their rough positions If it stays nice I'll be doing more brake stuff tomorrow hopefully.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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Apr 15, 2018 21:29:01 GMT
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no work on the brakes today, but I did finish off the second axle setup Made another washer on the lathe, hard work! spotted on fully welded ground down, I'm almost tempted to re-do the other side as it's untidy by comparison now welded to wheel and welded to the axle, not the neatest, but shouldn't turn! spinning away. it's not 100% straight, but shouldn't matter. the brake disk runs just about true enough not to bind, mext job is to make mounts for both calipers.
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MiataMark
Club Retro Rides Member
Posts: 2,962
Club RR Member Number: 29
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Who will you be dressing up as Farrah, Burt, the doctor or Captain Chaos... gratuitous picture of Farrah Fawcett, ahh the 80's...
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1990 Mazda MX-52012 BMW 118i (170bhp) - white appliance 2011 Land Rover Freelander 2 TD4 2003 Land Rover Discovery II TD52007 Alfa Romeo 159 Sportwagon JTDm
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I think the weak link in your build will be the wheels themselves , they tend to be made from cheese and also aren't designed for much in the way of side loadings. (thanks for Farrah though!!)
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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I'm going to be Burt, the rest of the crew are arguing amongst themselves over who they are going to be
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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I think the weak link in your build will be the wheels themselves , they tend to be made from cheese and also aren't designed for much in the way of side loadings. (thanks for Farrah though!!) the wheels are steel, so have much much more side loading resistance than the BMX wheels I used last year, which folded in half when I span, so confident they'll be ok
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Hehehe, interesting thread.
When I was a tiny kid my grandad had made a go cart out of big pram wheels on a shaped board. Very basic. Steering via a central pivot with rope or feet on the axle. Nothing to it. All the bigger kids had built themselves go-carts too and we had daily races in the summer holidays on a steep hill in the local park. Thing is, this cart my grandad had made went like absolute stink. Nobody could come near it. Total speed machine.
Recently I've been telling my youngest daughter about that and we decided we're going to build one this summer. So I came here with great interest but now realise the world has moved on significantly and you are actually putting more engineering into a soap box racer than I could ever hope to apply to my car hahaha.
So I don't think we'll be entering any soapbox derbies with our little go-plank. It's clearly a very different game these days!
(Bookmarked)
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