LEGO Working Fake Engine with smallest valves on YouTube reving to 4000+ rpm

[@JarekJedzie]

Wow, it works and sounds wonderful! At these speeds, something like an oil pan with constant lubrication would be useful.

[@ShaunSchafGames43]

Yes either that, or changing the cross section from a… well… cross, to a circle would also help. And reduce the friction coefficient of the materials. Let’s just say I don’t have this problem in my upcoming engine :)

[@FrostByteUK]

Lubing suggestion: Silicone oil (experiment with various thicknesses) basically forced in with the compressed air in tiny amounts.. it'd also act partly as piston pressure seal too..

[@ShaunSchafGames43]

I am already using silicone spray for lubrication :) Usually i inject it via the inlet aswell. However i have not done this with this engine yet, because its possible to remove the pistons and inject the oil inside the valve body during "maintainance work" :)

[@CWorm]

so a Wankel engine

[@ShaunSchafGames43]

@@CWorm Not at all. Not even one bit xD A wankel works via a entirely different principle. This engine uses a reciprocating piston, while a wankel uses a rotating piston.

[@royan.jdm2]

​@@ShaunSchafGames43brand of silicone oil for pneumatic cylinder you use , pls ?

[@jamesgroccia644]

Offset each pair of cylinders by 90°, that’ll put them out of phase and the engine will run much smoother. It’s a principle that steam engines have followed since 1820: cylinders operating out of phase don’t shake the engine as roughly as in-phase cylinders. Offsetting the cylinders also eliminates the problem of jamming at Front Dead Center or Back Dead Center, where the piston reaches the extreme of its stroke.

[@ShaunSchafGames43]

Thanks for your comment! You seem to know a litte about engines. :) I actually know about that. Sadly its not possible to offset the cylinders by 90°, as they wont allow it geometrically... The standard lego engine holder pieces have an offset of 106°. However with such small engines, imbalance is not really a problem. In this type of engine most of the "roughness" comes from the valve actuation. The valve of this engine requires more force to open with increasing pressure, what eventually limits max rpm and creates rough running on low rpm, which also makes the flywheel necessary.

[@metra90railfan]

Wow, it works like an engine, plus, it even sounds like an engine! Very great build 👍

[@ShaunSchafGames43]

Thank you very much! ^^

[@ichosolemanuel6048]

it works the exact same as real engines except pressure is witch compressed air instead of explosion

[@manishasharma8217]

That is really innovative! How did you modify the valves? It’s alright if you don’t make a vid on it but can you just describe it. This engine sounds amazing btw!!

[@ShaunSchafGames43]

Its not that easy to describe. But I basically took two seperate tire valve cores and made one out of both of them... For that i took them apart and took the body of one, and the inside of the other, if that makes any sense... I'll probably try to make a video on that in the future, but I can't guarantee it 100%...

[@manishasharma8217]

Thanks, that made a bit of sense ofc, lol. I also wanted to ask how do you seal your pistons very well without sacrificing rpms? Thanks again

[@ShaunSchafGames43]

@@manishasharma8217 i use rubber O-rings. They are Ø4x1 mm in size :) And lots of lube :D

[@manishasharma8217]

Thanks again, I am working on a high power i2 engine at the moment, this really helped!

[@batorback6303]

​@@ShaunSchafGames43 yes a video about it please!

[@cheese958]

Post more, I love your eingens

[@ShaunSchafGames43]

I'll post videos if i have something interesting to share ^^

[@ludicrousbrickstudio]

that is amazing!!! will you make a video on how to modify the valves? thx keep it up:)

[@ShaunSchafGames43]

I don’t know yet… at some point probably… But I first need to order the base valves again, which is not that easy as they are kind of annoying to get… Once I have new ones I’ll try to get the valve a little smaller (which should be possible space wise, but I reckon that the valve itself will perform worse…)

[@ludicrousbrickstudio]

@@ShaunSchafGames43 ok, thanks:)

[@metalboo8491]

I wonder if Lego games would use these for their car sounds.

[@ShaunSchafGames43]

good question ^^ Probably not tho

[@Krooker85]

Awesome video mate and the engine is brilliant! Can you make a video on how to make this??

[@ShaunSchafGames43]

I am planning on doing a tutorial for the valves at some point. But it will have to wait until i find the time to do it.

[@zynth_music]

if it sounds this good as a v4 i wonder how a v8 or v 10 or v12 would sound

[@ShaunSchafGames43]

You can find out how a V8 sounds if you watch my latest video ;)

[@Legotyres]

How have you sealed it plus are they push bike valves. For the air input, is it simply a can of air or are you using a Lego pneumatic to power it? Sorry for all the questions, but I think this really cool 👍

[@ShaunSchafGames43]

Each piston is sealed with a Ø4x1 mm rubber O-ring. Yes the valves use push valves :) But i use two different types of car valves that i cut up and put together to make one smaller valve :) I use a air compressor and the engine usually runs on up to 8 bar of pressure. It hits ~4000 rpm at around 5 bar i think, maybe a little earlier. But there seems to be some blockade that keeps it from reving higher. I have a suspicion as to why but im yet to test my theory... Np, i like to answer questions! And thank you very much! ^^

[@venturilegochannel9991]

Wow amazing job ! Please make a video about your custom valve 🙏 And is it a spring less valve ?

[@ShaunSchafGames43]

Thank you very much! It means a lot to hear this from you, you actually inspired me to to this type of Lego engine :) I finished a V8 just yesterday with your crankcase and my valves. I also made a crankshaft partly out of metal because I only have a FDM printer and the crankshaft would repeatedly twist itself to pieces… But I can’t get it over ~4400rpm for some reason… I think my valves could require a higher force to open at high rpm, but I’ll have to make „standard“ valves and do a comparison to confirm that suspicion I guess…

[@ShaunSchafGames43]

Oh and I almost forgot… it’s not springless, but I use very soft springs to improve low rpm smoothness of the engine… I use two different valve cores, take them apart and combine them inside the brick to create the valve. I could probably even fit it within the height of a single brick without the tile, but reducing the air volume above the cylinder will probably decrease the engine performance :( I’ll probably do a tutorial once I find the time for it and figure out how to shoot that sort of video… haven’t done that before :)

[@xmysef4920]

@@ShaunSchafGames43 Reducing air volume could actually be better, since then not as much compressor air expands in the cylinder head when it gets injected into the cylinder and therefore less pressure loss at TDC on the powerstroke. Less dead volume means a bigger expansion-ratio and that forces more of the air to expand inside the cylinder and not inside the head. That way you can get more torque and possibly even more power from less air input.

[@floork24]

This is extremely interesting! Just one question: does it require a lot of constant compressed air? I read in one of the comments that you have used an electric pump and requires about 90psi to reach 6500rpm. Aside from that, this is a great video and i love you content ❤

[@ShaunSchafGames43]

I used a normal workshop air compressor with an integrated air tank :) You can get one at most normal hardware shops 😅

[@floork24]

@@ShaunSchafGames43 I see thanks for the reply:)

[@imidsikkey]

So cool!... But I don't get it. Is it just rotating with compressed air forcing down the cylinder? I can see there isn't any sort of ignition system and the house seems to be feeding air, not fuel. There isn't any exhaust ports, either. Is the compressed air just blowing-bye the pistons to get out? Or am I missing something? Still a really cool little thing

[@ShaunSchafGames43]

It's not combusting anything, because it's powered by compressed air :) The grey bricks house valves. Every time the piston reaches top dead center the valve is opened and air can get inside the cylinder :) At bottom dead center there are exhaust ports in the cylinder wall. You cannot see them in the video though because they are inside the pin holes :)

[@imidsikkey]

@@ShaunSchafGames43 so cool! Great work 👏

[@musdred]

what tdo you use to power the system? i would imagine it is some sort of very high pressure air tank?

[@ShaunSchafGames43]

yes, i use a electrically powered air compressor :)

[@musdred]

@@ShaunSchafGames43 cool. also are the valves in the pistons custom made or using illegal lego building techniques?

[@ShaunSchafGames43]

@@musdred Those are custom made valves, yes :) I will probably do a tutorial on those at some point in the future :D

[@drsatan9617]

Hey there, awesome video I'm curious how many psi you were using

[@ShaunSchafGames43]

It’s been a while… but I guess that was about 6 bar of pressure… So roughly 6*14,5 psi, wich is almost 90 psi…

[@anamarti1800]

If anyone could make a car with Lego you could obviously make a literal blender I wonder what happens if you put your foot in it I just imagined it thanks I hate it

[@ShaunSchafGames43]

Please don’t put your foot in a blender 😂

[@anamarti1800]

@@ShaunSchafGames43 no I thought about a Lego blender basically a blender made out of Lego you know the feeling where you step on a Lego it's basically that but 10 times worse

[@twogluon]

Did you use a silicon gasket the way Lego technic embodiment does?

[@ShaunSchafGames43]

Nope, I tried that a long time ago and it didnt really work for me… I use rubber O-rings in all my engines. Rings with the size Ø4x1 mm are perfect for sealing the piston!

[@lucid523]

i know now BeamNG got the engine sounds from legos

[@ShaunSchafGames43]

I just stopped playing the game xD I know exactly what you are talking about ^^

[@100k-c]

bro it sounds better than my car even with factory turbo on it

[@ShaunSchafGames43]

I'm sad to hear that xD

[@DJSI3434]

Nearly 7000rpm on the lightweight flywheel!

[@DiRT3Xbox360]

How do you know? 🤔

[@DJSI3434]

@@DiRT3Xbox360 fundamental frequency of motor is just about 113hz at max speed which is about 6800 rpm.

[@ShaunSchafGames43]

I am not very sure about measuring this engine with an FFT. There is just so much noise and reflection of the engine frequency that I found it hard to identify the actual frequency with the programs i used… But if you have better software for that please let me know! But keep in mind that this essentially is a two stroke engine. So that means that there should be 4 sound pulses per turn with this engine.

[@DJSI3434]

@@ShaunSchafGames43 the software was whatever I was born with, and I took that into account ;).

[@xmysef4920]

@@DJSI3434 Lol I almost forgot other people were measuring with this way aswell! However, are you sure that you did that right? You take the fundamental frequency and divide it by how many times it fires in one cycle, and then *that* times 60. What you seemed to have done is you measured the fund. frequency and then took that directly times 60.

[@LegoTechnicEmbodiment]

Great!!!

[@ShaunSchafGames43]

Thank you very much!!

[@piRatCaptain]

That sweet sound

[@ShaunSchafGames43]

Thank you very much! ^^

[@_Drachenlord_]

Wow 🤩 Could you please make a toutoral on how to build this

[@ShaunSchafGames43]

I do have a tutorial on my channel actually :D

[@банка-ю6р]

so cool!

[@ShaunSchafGames43]

Thank you a lot!

[@justinarseneau4450]

did you use olive oil? best oil for lego they say and it really is (apparently oil based lubricants like wd40 ruins lego)

[@ShaunSchafGames43]

It’s true. Mineral based oils like WD40 are bad for plastic. To be more precise to the softener in plastics. So the plastic itself should probably be fine I guess? But it can damage your rubber seals over time… I did use silicone spray, which does not harm rubber. But I have never thought about olive oil 🤔 maybe I should try that some time

[@justinarseneau4450]

@@ShaunSchafGames43 but also olive oil evaporates in like 1-2 days and maybe try mixing both olive oil+silicon oil

[@xmysef4920]

@@justinarseneau4450Olive oil does *not* evaporate at room temperature, ever. It’s that the oil is both hygroscopic and it oxidizes over time, which might seem like it disappeared by a bit, but in reality it just turned into a sticky, goopy mess that just increases friction instead of lowering it. Silicone lubcricant is the best you can have for lego.

[@justinarseneau4450]

@@xmysef4920 oh thanks would silicon grease work?

[@latwingodejp2363]

where are the valves?

[@ShaunSchafGames43]

The valves are inside the dark blueish grey bricks on top of the cylinders :)

[@mikelmartin57]

Estoy con un proyecto similar y me encantaría ver las tripas del motor😅

[@ShaunSchafGames43]

I plan on doing a tutorial for the valves in the near future :)

[@Aston3003]

This is witch craft, since when can lego engine can look and sound cool. That aside very epic engine only took you 4 years to perfect your craft

[@ShaunSchafGames43]

Thank you very much! I have been building lego engines for more than 10 years at this point ^^ but i still learn new things with every engine i build ^^

[@alejandroacevedo9961]

it sounds like an motorcycle XD

[@riverasumen7486]

Can you try making a plane with this?

[@ShaunSchafGames43]

Not really 😅 Powering the engine requires that the air hose is attached to the engine. So i cannot power it remotely unless I use a very long hose, which will then weigh quite a lot. I could use an air tank on the plane itself, but then it will not fly for very long :(

[@gavinmountain1445]

you should make a lego car with that as it power to push it 😀😀

[@dropkickedmurphy6463]

What do you mean by "fake engine"?

[@stevevernon1978]

i would guess he means no combustion

[@dropkickedmurphy6463]

@@stevevernon1978 That was my first thought, too.

[@ShaunSchafGames43]

@DropKickedMurphy @SteveVernon Fake engine because the lego engine parts are usually used for display engines inside lego models. And as display engines they are also usually called fake engines, as they are fake engines :) As i took those exact parts and made them work i called it a "working fake engine" :D Hope that explains it :)

[@amplat9126]

How make the cube ?

[@ShaunSchafGames43]

I have a tutorial coming up very soon! ^^

[@yeetboy88YT]

how the f*** did you do that

[@ShaunSchafGames43]

xD Best comment so far! xD

[@ShaunSchafGames43]

I put some tire valve cores inside the brick. However if you use standard schrader valves they won’t fit into this package, which is why every other valve on YT is bigger. I actually used two different valve cores, cut them up and mushed them together to create „my own“ valve.

[@yeetboy88YT]

@@ShaunSchafGames43 some of that i don’t even know about let alone have the tools to do that

[@ShaunSchafGames43]

@@yeetboy88YT you don’t need that many tools. A drill, knife, file, pliers. That’s basically it. :) But I get that not everyone can replicate this :)

[@yeetboy88YT]

@@ShaunSchafGames43 maybe you can do a tutorial

[@NewEngland462]

What’s lubricant?

[@ShaunSchafGames43]

It is lubricated with silicone spray :) Mineral oils are not good for rubber parts, which is why i used a synthetic oil like silicone spray :)

[@royan.jdm2]

​@@ShaunSchafGames43any brands recommended? Especially for Lego yellow cylinder pneumatic.? Pls

[@josito1793]

Tiene válvula?

[@ShaunSchafGames43]

Inside each grey brick is a valve :) The valve opens when the corresponding piston reaches top dead center :)

[@יונתןרפאל-ק1צ]

How DCs walking?

[@ShaunSchafGames43]

Are you alright man? You left a random comment on another video of mine aswell… 😅

[@יונתןרפאל-ק1צ]

אתה יכול לעשות סירטון הסבר על המנוע תודה

[@axoneer7806]

Imagen this engine in a real Lego set

[@ShaunSchafGames43]

That would be really awesome! However youll need an air compressor to use it, and the engine is a lot of work to build. But most of the work is modifying the parts, so i guess it would not be as much work if it was an actual set :D

[@josefgame8435]

Do tutorial

[@ShaunSchafGames43]

I'll do a tutorial on the valves at some point :)

[@Abhyanazkah]

how to build 😅

[@ShaunSchafGames43]

A tutorial will be up in about 17 hours 😜🤫

[@chillieuwu]

Put this thing on a car

[@ShaunSchafGames43]

I don’t have a good car to put this in sadly 🥲

[@chillieuwu]

@@ShaunSchafGames43 build one

[@ShaunSchafGames43]

@@chillieuwu it’s not that easy sadly 😅 and A LOT of work. Just watch nicjasno on KZbin. He is building a Countach right now 😅

[@player9277smg]

plz tutorial

[@ShaunSchafGames43]

There will be a tutorial for the valves at some point, but at the moment i dont know when that will be.

[@roplayer9933]

Do a v twin

[@ShaunSchafGames43]

Im about to do the opposite, a V8 :)

[@charlesoliviersdufaux6943]

Put that in an RC car make out of Lego

[@ShaunSchafGames43]

Maybe some day :)

[@miloszkuschek8736]

Pls tutorial