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Camnecting rods What I want to know is how does it work if the engine stops perfectly at TDC or BDC
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Jun 24, 2023 20:41
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If I understood your concern correctly, given the age of the design I assume its kick start, and some over complicated mechanical solutions was incorporated by the German engineers. Or you need to kick twice to get it to start as it won’t be at t/Bdc on the second kick.
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Jun 24, 2023 20:48
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WAIT Wait Cramshaft Nailed it.
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Jun 24, 2023 22:57
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Beve Stuscemi posted:Camnecting rods There's functionally no difference to a chain drive cause you can see it's got the gears at the bottom, it can't spin backwards or anything Beve Stuscemi posted:Cramshaft Excellent
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Jun 25, 2023 03:03
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Here is an Unicorn. A German engineers fever dream.   Why do I say fever dream? quote:Some technical compromises had to be made to accommodate the G450X’s unusual clutch arrangement. One consequence is that the engine's crankshaft rotates backwards instead of forwards, as is typical. quote:With the design brief specifying both low weight and the improved handling brought by a longer swingarm, the required space was liberated by moving the multi-plate clutch to the right-hand side of the crankshaft. As a consequence, the clutch basket drives the gearbox, instead of the other way around. quote:On enduro bikes made by established competition, the front drive sprocket is located forward of the swingarm pivot, meaning that drive chain tension changes dynamically according to rear suspension movement. In turn, this means the drive chain must always incorporate a certain amount of slack. BMW solved this problem using its Coaxial Traction system, with the front drive sprocket located on the same rotational axis as the swingarm pivot. This is facilitated by the swingarm’s locating shaft running through a hollow gearbox output shaft. This arrangement allows the drive chain to be run with minimal slack (around 5mm, as opposed to the typical 25 to 35mm). This reduces chain lash without danger of overstressing the gearbox output shaft bearings, and reduces overall stress on the gearbox assembly. All quotes from https://en.wikipedia.org/wiki/BMW_G450X
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Jul 22, 2023 21:55
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Lol BMW 'solved' this 'problem' I'm not gonna link it here but suffice it to say their engineers are the dwarves from oglaf and will engineer the gently caress out of anything whether you want them to or not Slavvy fucked around with this message at 23:07 on Jul 22, 2023 |
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Jul 22, 2023 23:01
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Lol that’s the most bmw thing possible outside of telelever
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Jul 23, 2023 04:02
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Having helped replace the front sprocket on a G450, it is much more simple than you'd think.
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Jul 27, 2023 21:44
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Nidhg00670000 posted:Having helped replace the front sprocket on a G450, it is much more simple than you'd think. That's either bait or stockholm syndrome.
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Jul 28, 2023 06:19
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I mean, it's not like doing it on a "normal" bike, but it took us about 45 minutes, having never done it before and following a guide off of the interwebs. It's not like replacing the clutch on an older BMW K-bike or something.
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Jul 28, 2023 16:02
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*45 minutes later* so simple!
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Jul 28, 2023 20:39
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Yup.
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Jul 28, 2023 21:02
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Nidhg00670000 posted:I mean, it's not like doing it on a "normal" bike, but it took us about 45 minutes, having never done it before and following a guide off of the interwebs. It's not like replacing the clutch on an older BMW K-bike or something. Pro tip: on most bikes it's four bolts for the cover, two for the sprocket, slide the wheel forwards to loosen the chain and you're done. Sometimes you don't even have to take the shift lever off (2 more bolts)
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Jul 28, 2023 21:55
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Have you considered that by making something 3x as complicated and time consuming, they've realized a massive 1% performance improvement under favourable circumstances?
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Jul 28, 2023 22:02
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https://revivalcycles.com/blogs/the-handbuilt-show-blog/2023-builders-bikes
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Aug 26, 2023 23:06
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One of those bikes is a goon bike.
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Aug 27, 2023 19:39
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Thanks for sharing that thread I can't believe how many times he tore that engine down. Valt you're a monster
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Sep 7, 2023 06:22
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I don't know if this fits here but it's a 1940s, post-WWII, German "moped" with an 18cc 2-stroke diesel engine to power it and you control the cylinder compression with the handlebars. https://www.youtube.com/watch?v=SzouISFTHvM edit: it isn't shown actually attempting to run until the very end of the video, just so you know. Catastrophe fucked around with this message at 03:15 on Sep 23, 2023 |
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Sep 22, 2023 16:01
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It's beautiful
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Sep 22, 2023 20:02
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yeah i love that. post the video whenever he gets it on the road. i bet you could run it on old motor oil or canola oil or literally anything. it'd be a fun (noisy, smelly) way to commute to work
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Sep 23, 2023 18:49
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Yeah, it was one of those post WW2 poverty spec things that would sorta kinda run on any type of hydrocarbon you could get your hands on, in carpet bombed Germany. There's a Miele (yeah, from the vacuum cleaners and washing machines) for sale in the Netherlands for €1800 or so. I am very tempted, but considering it is literally a bicycle, likely without frame number, with a tacked on engine, i doubt i could get it road legal. And if i can't smoke out the streets with it, i'm not gonna spend *that* much money on it. I also found 2 engines together for around €450.
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Sep 23, 2023 19:00
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https://youtu.be/3U02jPPAme0?si=I_CyzB5hwBQHVMPy The video of it running/him riding it.
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Sep 25, 2023 02:26
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This is neat - Suzuki SW1. Only 200 were made https://jalopnik.com/this-suzuki-is-a-rare-motorcycle-with-the-benefits-of-a-1848669291 Belt drive, rear storage, tank storage.  I wish there were more elegant utility-oriented bikes on the market.
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Jan 12, 2024 23:00
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If only it didn't look like 1970's hospital equipment
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Jan 12, 2024 23:24
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Slavvy posted:If only it didn't look like 1970's hospital equipment I think it's gorgeous.  I bet you don't even like the Moto 6.5 or the R1150R.
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Jan 12, 2024 23:27
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Sagebrush posted:R1150R. Revolting
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Jan 12, 2024 23:31
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Slavvy posted:If only it didn't look like 1970's hospital equipment That’s why I like it
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Jan 13, 2024 00:20
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NoneMoreNegative posted:One of you Figgie Fuckers must have a spare $27k USD lying about, right..?
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Jan 21, 2024 07:33
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super disappointed it doesn't have the capsule sticker
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Jan 21, 2024 08:23
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Tetsuo posted:ceramic double rotor 2 wheel drive, man it even has computer-controlled anti-lock brakes, 12,000 RPM!
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Jan 31, 2024 17:12
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All hail the king of the thumpers https://www.youtube.com/watch?v=twXWgs-KYKM 2000cc single
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Feb 6, 2024 06:21
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This is the only Bison video I need. https://www.youtube.com/watch?v=Ygyk_eCMGzU
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Feb 10, 2024 02:10
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Magnificent
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Feb 10, 2024 02:32
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lmao hell yeah
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Feb 10, 2024 02:38
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Schnell Explosion
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Feb 10, 2024 02:39
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Been following this account for a while and whenever this bike pops up I get confused. It sits right on the line between hate and love for me. Like it's so close to being a bike from some anime that I watched as a kid... https://x.com/henken_bike/status/1756700425451962632?s=20 *edit: and then I find out it was used as the base for a couple of bikes in the mostly beautifully aesthetic but otherwise wank Ghost in the Shell live action.  https://www.asphaltandrubber.com/lifestyle/honda-nm4-vultus-ghost-in-the-shell/    Olympic Mathlete fucked around with this message at 11:38 on Feb 12, 2024 |
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Feb 12, 2024 11:34
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Olympic Mathlete posted:Been following this account for a while and whenever this bike pops up I get confused. It sits right on the line between hate and love for me. Like it's so close to being a bike from some anime that I watched as a kid... A slip most freudian.
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Feb 12, 2024 18:39
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not a slip, the live action Ghost in the Shell movie was shite
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Feb 12, 2024 18:58
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In the grim darkness of the British Isles, wank is sometimes used as an adjective It's weird I know
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Feb 12, 2024 19:33
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Jazzzzz posted:not a slip, the live action Ghost in the Shell movie was shite 
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Feb 12, 2024 23:22
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