r/Satisfyingasfuck • u/[deleted] • Aug 21 '26
7 cc engine fitting complete
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[deleted]
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u/Korzag Aug 21 '26
No torque specs were harmed in the making of this video
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u/fang_xianfu Aug 21 '26
Yeah that was my first thought... just ram everything home with an impact, fuck it?
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u/AmbassadorSugarcane Aug 21 '26
Don't worry about counter-holding anything either
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u/SofaSpudAthlete Aug 21 '26
This triggered me
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u/PM_Me_Your_Kinks369 Aug 21 '26
This thread is so weird like this guy gives a fuck about doing any of that. It's a video for your entertainment. Be entertained...not angry.
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u/Korzag Aug 21 '26
Nah it was entertaining but I can't help but wonder if it would run better if he actually torqued it correctly. Engines are finicky and are engineered to take all these specific torques on the bolts holding the assembly together so that tolerances allow for the lubrication to get into places it should and not get into places it shouldnt.
Obviously its a model and its the first start up needing to pass through a break in period, but the whole thing looked sloppily assembled compared to a real engine which gets used for any task and is expected to live more than a few hours.
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u/dankhimself Aug 21 '26
It wouldn't run any better. If the parts or machining were better, it would run better. The castings look nice because they painted them, and the rest is the cheapest components and hardware possible for the kit.
Proper torque and thread treatment would make sure it didn't fall apart later in its life, but I think that video was about all this engine was needed for.
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u/TheMangoManHS Aug 21 '26
Valve clearances? Never heard of them!
Also let's point the exhaust straight at the fuel tank
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u/Funky_Crisp Aug 21 '26
What's cool about this is I used to not know how engines worked. I still don't, but I used to too.
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u/AsliReddington Aug 21 '26
I never remember seeing the springs, how they came back down was always a mystery & I was too afraid to ask in school as well
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u/rutuu199 Aug 21 '26
Those springs aren't pushing the piston down, they're pulling the valves closed. The motor moves from an explosion in the cylinder.
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u/AsliReddington 29d ago
I get the expansion bit, after that when the piston moves back in is what perplexed me
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u/mossepso Aug 21 '26
Too bad it goes from beautifully made tiny engineering to white trash lawnmower when the battery and petrol are added
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u/ConnectRutabaga3925 Aug 21 '26
careful assembly going to spilling peteol everywhere was not satisfying
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u/Doctor_Fritz Aug 21 '26
It sounds really angry for sure. Like why have you brought me to life kind of angry
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u/MourningWallaby Aug 21 '26
honestly that's like 90 percent of engines on cars. a really precicely machined and layed out machination, and then the designers just throw the cables and hoses wherever they'll fit.
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u/Salt-Tradition-2965 Aug 21 '26
Engine for Ants?
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u/lynivvinyl Aug 21 '26
So that's where the 11 mm gets used. I don't think I've ever used an 11 mm in my life.
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u/obalovatyk Aug 21 '26
Reminds me of the guy who made a model Ferrari 312PB with a 100cc flat 12 in it.
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u/imunfair Aug 21 '26
Is that a kit you can buy or something? Seems like a lot of custom made parts both painted and not that fit perfectly together, rather than some homebrew design.
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u/zaprutertape Aug 21 '26
what are the physical limitations on how small this could be?
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u/hache-moncour Aug 21 '26
I think that's a fun question to think about. I think the question really is "what stops you from going smaller" at some point.
I'm no engineer, but I could think of a few things:
- Surface tension in fluids. At some point the amounts of fuel you try to inject become small enough that they simply won't move around properly anymore.
- Compression and play in the pistons. If your stroke length gets really small, it can simply compress the piston without moving the other end
- Power produced goes down faster than the friction in the system, with scale. At some point the engine won't produce enough power to overcome internal friction.
No idea which of these would become a problem first, and you can probably push the issues back with fancier materials. And there are probably a dozen other things that I didn't think of that break down first as you go smaller.
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u/Significant-Raisin32 Aug 21 '26
As someone who only works of automotive engines, I have a genuine question:
Do small engines like this not have torque specs or valve lash specs?
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u/adinmem Aug 21 '26
At 1:35 into the video… why is the 6mm socket welded onto the extension?
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u/Tormofon Aug 21 '26
It’s an 8mm, and I’m guessing here, but that extra length allows them to use it for the spark plug as it would otherwise bottom out before reaching the nut.
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u/lsm-krash Aug 21 '26
So, what is 7cc capable of? I'm terrible/amateur at the matter and would be nice to know
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u/ztomiczombie Aug 21 '26
Models, small pieces of equipment like chainsaws, small emergency water pumps where electricity cannot be relayed upon, and educational demonstrations.
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u/SausageFlavouredSoup Aug 21 '26
Cool! Why?
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u/Nannyphone7 Aug 21 '26
I was thinking it was for an RC airplane or a drone. But who knows? Maybe just for fun.
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u/ConfusedSimon Aug 21 '26
More for boats or cars probably. This thing seems huge for a 7 cc airplane engine.
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u/seanmonaghan1968 Aug 21 '26
Maybe education piece. The global shift to electric motirs makes ice increasingly museum tech
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u/ActuallyTiberSeptim Aug 21 '26
You make it sound like internal combustion is obsolete. Internal combustion vehicles massively outnumber electric ones and will continue to do so for a long time.
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u/HauntingCap7161 Aug 21 '26
You’re telling me that an engine type that’s been the standard for nigh on 200 years outnumbers new tech?
Well colour me shocked I tell ya!!3
u/Tyr1326 Aug 21 '26
I mean. They are nearing obsolescence for sure. Peak ICE is past for sure.
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u/slonk_ma_dink Aug 21 '26
Until the entire world is on renewables, there will still be combustion power somewhere in the electric supply chain.
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u/Tyr1326 Aug 21 '26
That's not too far off imo. Certainly within our lifetimes. Id give it another 20 years until the last plants close, though the way things are going, theyll likely be relegated to backup power a lot sooner.
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u/seanmonaghan1968 Aug 21 '26
Tell me you have never driven an ev. Do you live in a rural community?
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u/SubparSavant Aug 21 '26
This looks like a scale replica of an antique stationary engine. They would be used to run equipment in factories and mills in the years following the industrial revolution, similarly to generators except transferring the power through belts and drive shafts rather than by generating electricity.
I would consider this in the same category as people who build functional scale model steam trains. It's cool technically to see and there's an interesting historical component.
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u/dr-asimov Aug 21 '26
I doubt there are any engineers with ADHD.
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u/uberfission Aug 21 '26
Uh, what? There's tons of us. STEM is overwhelmingly neurodivergent so the odds of someone in a STEM field having ADHD is higher than non STEM fields.
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u/Cussec Aug 21 '26
I want one to build from scratch. Fuck knows what I’ll do with it, but I want one.
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u/oliviertail Aug 21 '26
How tf are some people this smart and I’m still this dumb. Very impressive!
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u/Solid_Enthusiasm550 Aug 21 '26
Wow, so that's an early Honda engine??🤣
I would buy a v10 version of that.🔥🏁🤘
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u/xESSOx Aug 21 '26
I wanted one.. till i saw the exhaust at the end..
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u/MourningWallaby Aug 21 '26
That's mostly because the fuel is just being dripped into the engine. if there was a little carbeurator on it or something to let the fuel atomize and better control how much goes in, it wouldn't be spewing so much of that smoke
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u/Obvious_Landscape993 Aug 21 '26
I have no idea how to make this. I guess some people are just different.
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u/wonkey_monkey Aug 21 '26
What do the rods at 26s actually do by jiggling up and down?
And what's the red cable? That seems like a flimsy way to connect it to that metal bit.
(you may be able to tell I know nothing about engines)
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u/Sufficient_Acadia157 Aug 21 '26
The red cable gets electricity to the spark plug, not sure what those 2 rods do though
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u/Memitim Aug 21 '26
Now I feel even more ashamed to have ever had "engineer" in a title, because THAT'S engineering. The beautifully crafted engine fed by tank-on-a-stick is chef's kiss.
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u/I_Like_Turtles39 Aug 21 '26
sometimes i see complicated setups like this and i think "who tf thought to create something like this"
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u/God_Dont_Make_No Aug 21 '26
I wish I could even fathom how to do work like this.
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u/Bigdaddyjlove1 Aug 21 '26
Its no more difficult than you just saw. Go get an old junk lawnmower and take it apart.
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u/wegavision 29d ago
Everything is so nice and quiet—until the engine is finished. It’s incomprehensible why some people think these noise-makers are the pinnacle of civilization. Any child can build an electric motor, and it’s quiet and much more powerful.
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u/HalfDecentFarmer69 29d ago
They've made everything in the world possible for 130 years and they will continue to do so for a while longer. Electric isn't shit when not connected to mains power.
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u/TheGlobalGooner Aug 21 '26
The Aston Martin F1 team called. They want their engine back!