dangerous doug Posted January 26, 2021 Share Posted January 26, 2021 just for fun Slightly off topic but myself and @landroversforever have been playing games of guess the weight and my newly modded mini subframe came into question its the later single bolt flavour and the book says they come in at 16.2kg heres the kicker, I’ve drilled around 75 speed holes in it and also chopped of certain unneeded corners. All the holes over 13mm have had the dimple die treatment for added flair(see what I did there) and to hopefully stiffen it up a bit more. The whole car is being built with the ethos “remove weight, add structure” but theres more.....I also added gussets, braces and boxed it all in.....this stuff unfortunately wasn’t weighed before it was added but this makes the game a bit more fun. It’s all mild steel, has holes and is 2mm thick. The tower braces are hollow box, 3mm thick around 38x10mm. There is also the welding wire to take into account as a lot of seams were fully welded aswell so How much do you all think my work to offset the additional weight added has payed off anyone care to have a guess? im in at 16.75kg ross - 15.5kg there’s plenty more weight to be lost before the structure is compromised too 3 Quote Link to comment Share on other sites More sharing options...
Badger110 Posted January 26, 2021 Share Posted January 26, 2021 16.2 Quote Link to comment Share on other sites More sharing options...
Wytze Posted January 26, 2021 Share Posted January 26, 2021 When i did my mini, the bare subframe came in at 19 kg. After alteration for the Swift gti engine and gearbox, it was 16.7kg. The whole mini after the swap with a half leather interior and a six point roll cage was 550 kg. 350 in the front, 200 in the back 2 Quote Link to comment Share on other sites More sharing options...
steve b Posted January 26, 2021 Share Posted January 26, 2021 17kg Ross' 90 2720kg with battery and full tank....allowing for temporal drift Steve b Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 27, 2021 Author Share Posted January 27, 2021 5 hours ago, Badger110 said: 16.2 So far the closest 4 hours ago, Wytze said: When i did my mini, the bare subframe came in at 19 kg. After alteration for the Swift gti engine and gearbox, it was 16.7kg. The whole mini after the swap with a half leather interior and a six point roll cage was 550 kg. 350 in the front, 200 in the back That is pretty much what I am aiming for. A Fully dressed mini coming in at 550kg aiming for 130bhp from a 998 turbo and cross flow 3 hours ago, steve b said: 17kg Ross' 90 2720kg with battery and full tank....allowing for temporal drift Steve b We will never know because it will never be done😂 Quote Link to comment Share on other sites More sharing options...
Wytze Posted January 27, 2021 Share Posted January 27, 2021 Nice! From a A series 998? I went for the Suzuki because it was light, 90kg for the complete engine, 26kg for the 5 speed gearbox. And 100 bhp from the start. Later, i went a little mad. bought a carbon roof, lexan window kit. The rear side glass is over 3kg, and the doors are 26kg. I could go on about it, but will stop now🙃 Quote Link to comment Share on other sites More sharing options...
L19MUD Posted January 27, 2021 Share Posted January 27, 2021 12 hours ago, steve b said: 17kg Ross' 90 2720kg with battery and full tank....allowing for temporal drift Steve b if it is much more than that Steve we will certainly never know as the scales only go up to 2800kg 😁 Quote Link to comment Share on other sites More sharing options...
bishbosh Posted January 27, 2021 Share Posted January 27, 2021 3 packets of smarties and a (dark chocolate, obviously) Bounty. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 27, 2021 Share Posted January 27, 2021 6 hours ago, Wytze said: The rear side glass is over 3kg, and the doors are 26kg. I could go on about it, but will stop now🙃 Please continue - it's touches like this that folks don't think about but it's amazing how they all add up, even on a big heavy thing like a Land Rover. I put ~3mm Lexan windows in the back of the 109, mainly because the stock glass had a lot of gaps, but it's amazing how many Kg's of glass came out of it. Back on topic: I guesstimate 15 Laden swallows. Quote Link to comment Share on other sites More sharing options...
Wytze Posted January 27, 2021 Share Posted January 27, 2021 10 minutes ago, FridgeFreezer said: Please continue - it's touches like this that folks don't think about but it's amazing how they all add up, even on a big heavy thing like a Land Rover. I put ~3mm Lexan windows in the back of the 109, mainly because the stock glass had a lot of gaps, but it's amazing how many Kg's of glass came out of it. Back on topic: I guesstimate 15 Laden swallows. Yes😁 All little things ad up. The doors went from 26 to 6.5 kg. Even the hinges got drilled. 0.5 kg less on each door again. 1 Quote Link to comment Share on other sites More sharing options...
Badger110 Posted January 27, 2021 Share Posted January 27, 2021 I swapped out the puma doors for military front and series 2nd row, hell of a weight difference Quote Link to comment Share on other sites More sharing options...
elbekko Posted January 27, 2021 Share Posted January 27, 2021 16.1kg 30kg once it fills up with crud. Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 27, 2021 Author Share Posted January 27, 2021 10 hours ago, Wytze said: Nice! From a A series 998? I went for the Suzuki because it was light, 90kg for the complete engine, 26kg for the 5 speed gearbox. And 100 bhp from the start. Later, i went a little mad. bought a carbon roof, lexan window kit. The rear side glass is over 3kg, and the doors are 26kg. I could go on about it, but will stop now🙃 Yes, going aluminium cross flow head, efi and a small turbo(gt15 ish) there was a guy with a 998 running 180bhp in his hillclimb car but I think it’s safe to say most of that figure is RPM. I want to keep it mini....ish. I could just fit a bike engine and it would be lighter and faster but I need to keep some of its soul😉 it’ll be all steel aswel. The lexan windows are a must really if you want to save weight so I’m with you on that. 3 hours ago, FridgeFreezer said: Please continue - it's touches like this that folks don't think about but it's amazing how they all add up, even on a big heavy thing like a Land Rover. I put ~3mm Lexan windows in the back of the 109, mainly because the stock glass had a lot of gaps, but it's amazing how many Kg's of glass came out of it. Back on topic: I guesstimate 15 Laden swallows. African or European?! Be more specific man! this was exactly the point of this thread. I see so many people bolting so much useless junk to the outside of their cars. Boots normally full of nonsense too and I struggle to see how people dont understand all that extra weight has an effect. They can still carry all of their “treasures” but offset the weight elsewhere. Your windows are a perfect example, Fitting series doors asking your self if you really need that hd 6mm crossmember when the factory one lasted 20 years.... 2 hours ago, elbekko said: 16.1kg 30kg once it fills up with crud. Excuse me sir! I have owned a landy long enough to know when I need a drain hole, the skills are transferable😂 2 Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 27, 2021 Author Share Posted January 27, 2021 Anyways the results are in, I’ve known since yesterday so I’ll give it a bit longer if anyone else wants a guess Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 27, 2021 Share Posted January 27, 2021 15.8 Quote Link to comment Share on other sites More sharing options...
Carloz Posted January 27, 2021 Share Posted January 27, 2021 I think the little holes are not worth the job and weaken the most important areas (the edges). And the big holes where already there. Together with the added braces the weight will be near the weight you started with. Maybe even a little heavier.. 🤔 Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 27, 2021 Share Posted January 27, 2021 4 hours ago, dangerous doug said: African or European?! Be more specific man! I just checked, it's probably more about the weight of the coconut given that: Quote The South African swallow has an average body mass of 21 grams. This is very slightly higher than the European or barn swallow (Hirundo rustica), which has an average body mass of 20 grams. 1 Quote Link to comment Share on other sites More sharing options...
steve b Posted January 27, 2021 Share Posted January 27, 2021 ..did someone say dark chocolate bounty? Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 28, 2021 Author Share Posted January 28, 2021 we are actually under! There is still more meat to lose so I may crack the drill out over the weekend 10 hours ago, Carloz said: I think the little holes are not worth the job and weaken the most important areas (the edges). And the big holes where already there. Together with the added braces the weight will be near the weight you started with. Maybe even a little heavier.. 🤔 we’ll have to agree to disagree on that. Some people cut a strip off of them reducing their length by around 5-6mm. Probably would have saved more doing this but It would be tricky to make it look good. the twist that those flanges would have taken out of the frame has been superseded by the gussets from the cone towers to the front of the frame (they are welded to the flange and to the top face of the frame where the bottom gusset meets the underside) and the boxing of the front crossmember Quote Link to comment Share on other sites More sharing options...
paime Posted January 28, 2021 Share Posted January 28, 2021 How do you know where to drill and where to leave alone? Is it solely down to experience or are there some maths and engineering going on? I'm fairly sure if i tried something similar i would have a collapsed sub-frame in the first mile of driving! Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 28, 2021 Author Share Posted January 28, 2021 8 hours ago, paime said: How do you know where to drill and where to leave alone? Is it solely down to experience or are there some maths and engineering going on? I'm fairly sure if i tried something similar i would have a collapsed sub-frame in the first mile of driving! In short, I don’t. There’s a lot of stuff out there telling you where you can and can’t drill/cut and as per the internet, one thing contradicts the other. I worked on the principal of not removing too much behind where the engine mounts bolt as if I did have a frontal impact with something the frame would crush upto the engine anyway. the other thing I wanted to try but diddnt have the balls to do incase it ruined the look and did nothing practice was to alternate the direction of the flairs of the dimple dies. Couldn’t quite work out if that would do anything or not... anyway, some examples of working subframes which give me confidence that mine will be ok. Some of these are basically spider webs.... Quote Link to comment Share on other sites More sharing options...
Wytze Posted January 28, 2021 Share Posted January 28, 2021 Solid mounted to the body, and it will be strong. Are you going the removable front way? Then maybe some bracing From the bulkhead to the front where the tierods are. Quote Link to comment Share on other sites More sharing options...
Escape Posted January 29, 2021 Share Posted January 29, 2021 Most solid parts can be replaced with a truss structure without losing (much) strength but adding considerable lightness. So drill holes where it won't interfere with triangulation, leaving a truss structure (as in the pics above). If you have a basic understanding of the forces acting on it, it should be pretty obvious. And of course always better to err on the safe side! 1 Quote Link to comment Share on other sites More sharing options...
Badger110 Posted January 29, 2021 Share Posted January 29, 2021 Do you need my address to send the prize of a packet of salt n vinegar smiths crisps, 2 wham bars and a tube of smarties, for getting the nearest guess? 1 Quote Link to comment Share on other sites More sharing options...
dangerous doug Posted January 29, 2021 Author Share Posted January 29, 2021 1 hour ago, Badger110 said: Do you need my address to send the prize of a packet of salt n vinegar smiths crisps, 2 wham bars and a tube of smarties, for getting the nearest guess? 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.