Gotta get this paired up with my See Through Rotary Engine.

I think you're close - just need a planetary gearbox instead of a regular one - more gears per stage, less likely to strip teeth. Maybe a nema 11 size one? You can get them in 27:1 ratio.

Try making a supercharger using and axial compressor setup, that would be cool !

Don’t give up my guy, you’re literally right there

Hey Johnny, before you totally scrap this venture, maybe try some of the suggestions in this section. I didn't go through all of the comments, so sorry if I'm repeating the suggestions of others' but I would recommend; 1. Looking at impellor design to include stub fins inbetween the main ones to make double the number of fins, as seen on real turbo/S.C. impellors. 2. Stronger gears, either by using substantially scaled up gears with chunkier teeth or full planetary. 3. Changing pulley sizes to get more mechanical advantage (in this case, speed). You did so well making these components, it would be a crying shame not to continue tinkering with it some more. I can understand the frustration, & look forward to seeing the positive displacement type being built, but would love to see a revisit to this project. Keep up the fascinating work, love those skills! 😉👍

Poor little brass gear,but hey what a way to go,better to burn out than fade away ☠️☠️

WOW ,, i'm surprised it ran at all ,,you'd need titanium hardened gears to run that kind of RPMs for any length of time ,,, brass just wasn't meant to run 156K RPM

You need to put a stator after the impeller, or some sort of analogue to that. The air must be slowed down to increase in pressure (and thus give boost). Otherwise you just have a fancy centrifugal blower. If you look Up centrifugal compressor I am sure you will find the info you need. Agentjayz has videos on his channel about stators, and why they are needed.

As someone who does quite a bit of CNC and CAD in school and in my spare time it would be interesting and appreciated if you would post a video of your 5-axis CAM workflow and what software you use. Otherwise great video, waiting impatiently for the next one.

aWhen Turbochargers and centrifugal superchargers are made, they have those smaller fins behind the main fins. The idea is to break the turbulence and stop the eddy current air that can keep you from Gaining boost. Before you completely scrap the idea, you might want to look at impeller design. I would certainly love to watch you build a positive displacement supercharger though... there are several different designs to choose from, watching build a Roots blower would be fun. A screw-type might be louder though.

Don‘t Grind on your impeller with a Dremel to give it an „airfoil shape“ this will just add even more imbalance and will lead to it ripping appart

13:34 this is exactly what i love so much about your work. Ablosute precision home made! Greeting from Switzerland

Because a centrifugal supercharger wasn't hard enough. Let's build a positive displacement one instead!

Hands down the coolest youtube chan! keep it up brother!

You still blow my mind every time you upload a video, your engineering skills are amazing. Totally riveting to watch. Keep up the awesome work 👍🏁

Your work is brilliant. I love watching it. Your fits and tolerances are incredible, as is your ability to imagine. Please keep making videos!

Nice I like micro scale of everything, can't wait to see the miniature supercharger!

I am sad that there is no suitable gearbox. But i am also super hyped for the roots compressor. can't wait to see how it looks and sounds and works. I wish you luck.

Amazing skills as always. 2 gears in housing 60 primary 10 secondary on impeller shaft , big gears off a 1/8 rc car driveshaft / motor. Also inlet diameter plays a small roll also on vacuum pressure you go to big for impeller you loose pressure, Hope you finish it .. 3D print some different size inlet restrictors 0.5, 0.75, 1mm smaller than you have to plug and test. Can't wait to see it go and the blower build but this will work with your craftsmanship. GOOD LUCK

The work you do is so amazing. I sit for hours watching video after video, keep it up!

Gearbox would probably survive if it was steel gears but Positive displacement superchargers are cooler anyway

You can look up the rotrex centrifugal superchargers. The use a panetary "gear"train that uses hydraulic friction instead of gearteeth. It may give you some inspiration to build a version of your own. I'd say give it a go

I feel like if the impeller shift was press fit to the bearings in the housing it may not have failed as soon. I understand brass is soft, so if the impeller was to shift and cause friction between the bearings and the shift it may put too much load in the brass. Great jog with the videos. This is so cool to watch. I am a diesel mechanic and to see the mini version of an air charger like this amazes me. Keep up the unbelievable work!!! 👏 👍

The level of skill is amazing. Great work! Very entertaining to watch!

Looking forward to your next video sir, everything you make is a marvel of miniature engineering!

I think you need to improve compressors wheel design, to build boost. For gears, oil or grease, when they heat up, they lose viscosity, so continious oil delivery (circulation) would be good thing to do. Like a mini pump up top, and a small container to colect it on the bottom

I can't wait to see how the mini roots blower turns out, love your work

Awesome try bloke ! years ago i tried the same thing but just couldn't drive it fast enough and it ended up bigger than the engine i was planing on mounting it to . I know roots blowers are old tech but they just work and work in small scale iv made one ,I'm relay looking forward to what you come up with.

you dont need much boost, i think the high airflow of the supercharger was already prety good

Man awesome content!! I was still impressed it blew the balloon up!

The precise machine work was pretty satisfying. Very nice

positive displacement pumps require incredible precision to make. and this channel is a perfect fit.

Man I wish I had your skills... build a functional turbojet engine, if any you tuber is capable it’s you!

Probably the poor thing overheated because of lack of lubrication

i was so wanting a choo choo choo turbo noise lol your works amazing thanks for sharing 👍

I don’t have any experience in engineering but I found this video somehow very interesting and satisfying to watch 🥰

It has to feel pretty good to be able to machine your own pieces and they work. I'd love to try that one day

Love these videos, they’re fantastic. I think you should keep pushing with this, maybe a different style of gearbox? Tbh it looked like you needed way, way more lubricant in the gearbox, but this isn’t my wheelhouse (if you’ll excuse the semi-pun).

Damn it! Oh well it was still badass. Cannot wait to see the roots blower!!!! Thanks for the amazing content PLEASE KEEP IT UP!!!

I've pretty much watched every single one of your videos. Your videos are so interesting and I really appreciate them a lot. thank you for being awesome.

Your problem is sealing. If you want to attach this to a glow engine, you'll run into another problem; the carbs do NOT work worth a damn if they're downstream of a compressor. Do one more test with a centrifugal compressor. Put the carb upstream of the compressor. The castor oil in the fuel should seal the impellor and allow boost to build. You could probably get away with a 1:5 or 1:10 gearbox if you had extra sealing and I think itt'l get plenty if it's pulling A/F in through itself. This is how they're set up on actual hotrods that have carbs, too. The carbs sit on top of the blower.

I love these vids, could watch days of this content, thank you!

Needs some better lubrication and cooling. Try mobil jet oil II. Probably a cnc machine like a Kern would help too.

The balloon certainly put the flow + pressure into perspective. 👍

I wish I could double like this video! I can't wait to see this next supercharger!!!!!! So cool keep it up!

If a 6-71 was good enough for the last of V8 Interceptors, I hope it's good enough here. Very cool project. Easy for me to say especially given the title but after you said "we need 5xs that," and revved it, I though "it's hurt."

Thanks for sharing the learning process!

Looking forward too the roots supercharger! One of my personal favorites

You should release an album of " sensual tapping sounds" I love it man .

Also mate, Try a different oil rather than glow fuel. A low viscosity group 3 synthetic. Oh and yeah, don't give up. We're all watching and hoping the best comes of this project. Keep going. Oh and nice work with using a bit of Moly grease, I love me a bit of Moly!

That’s an awesome vid/build. Good luck with the roots.

Incredible machining precision Congratulations!

Man I badly wanted the procharger to work!!!

Amazing to watch and gives great satisfaction. "Turbo charger" "supercharger" who cares I would like to see the ones who are immensely rude like to do anything remotely interesting unless they are creating space rockets in their shed and spare time. Which I seriously doubt it.

I don’t have any technical advice but wanted to say how much I love your builds!!

Love your videos You should use the 4 jaw chuck more often to maintain concentricity when machining parts to be used at extremely high rpms. Will help with balance as well 👍

12:20 Just your average steam locomotive going past

"This used to be a brass gear" "Not any more" Cracked me up so hard xD

It is a perfect and great " failure" of the compressor. So amazing and interesting. Keep going forward and stay safe while working on the stuff.

I just love watching you make tiny CNC/machining 😁👍👍👍👍👍

What if you made a freewheel clutch to stop the impeller from stripping the gearbox

17:20 when it actually inflated a balloon thats really impressive

For years I've been watching you progress and each time I return I'm never disappointed. If you're not producing and selling these or a real supercharger in the future I'll probably feel sad.

this is the best channel i hav found yet ty Johnny its awesome

Give a planetary gearbox from a drill a try for your next gearbox.

Hey, It has been so interesting to watch videos of this project. Please, don't give up on this supercharger yet! As many youtubers do, ask for some online help. I am sure someone is able to run a CFD simulation on your impeller design and tweak it to be more efficient. Another person would be able to help out with the gearbox. This project seems to be so popular that it should not be only your project. It is ours too! :)

I think the biggest reason the gearboxes keep failing is torque multiplication... The impeller requires x amount of torque to overcome the friction of it and the air it's moving (and compress it). In your case given the scale, might seem negligible, but for every time you're doubling the speed it also has to double the torque to achieve that. There's also a limit to how much air can be moved/compressed in the given space of your impeller, after that there is a huge increase in resistance. Fluid dynamics aside, think about it like a servo gearbox in reverse, the motor is easy to turn with your finger when it's not connected to the gears, but try turning it from the output shaft and it's a lot more difficult. If the impeller was the input shaft, you would get loads of torque on the other end (your current input) and the gears on that end would need to be able to handle that torque. Unfortunately that very same torque is what your issue is, except it's on the input side, and you're driving that input with a motor that far exceeds the torque handling of the input gears in your design. This is an issue you are going to have in every iteration and supercharger type: getting the necessary RPM to compress (which adds a significant load), vs the space you have, vs the friction and consequent input torque to drive the gearbox, vs the amount of loss. If I had no other choice but to do what you are trying to, I would work backwards, first see if the impeller/s can actually compress the air to your PSI (PSI being pounds per square inch) that will tell you how many pounds your impeller needs to support. Then you need to work out the area that force is distributed over and the angle that that force is being applied in. That will define the design and size of your compressor (impeller). From that design, you should be able to calculate the final torque required to achieve that compression. Then you work backwards through the gear ratios, each time the output speed is reduced (it has to in this direction if you want to multiply the speed from the input shaft), you need to calculate the new torque being placed on the gears in that step and use the appropriate material, based on that materials shearing torque characteristics, all the way to the final input, which will need the most durable material to shearing forces. That will determine the final size and efficiency of the compressor and drivetrain. It will need to be highly efficient, low friction and made of stuff that isn't brass or aluminium (or at least the gears won't), but there's so much more going into a design like this (axial loads of the gear bearing surfaces, appropriate lubrication, viscosities, losses in compression and heat etc) that probably require more than one mind, and those minds would need to be somewhat experts of all the relevant fields. Sadly I don't know enough about any of them to be further help, but I do know enough to know what the issue is, and I know that even changing the style of compressor is not going to fix this issue (unless it's to a source of already compressed air). I might be wrong and very much am open to correction and or additional input, and if I am wrong I hope you succeed. Also, you don't necessarily need the high RPMs, you need compression and flow (higher than the engine can consume for the given RPM), so tighter tolerances and more efficient design entered around those goals will yield the best results. You might even end up needing a reduction in RPM.

Your an awesome machinist/fabricator johnny!

When all else fails, return to your Roots.

There's no way someone with the knowledge to build this actually thought that tiny thing would move the needle on the boost gauge

May I come with a suggestion... Ok I don’t know what you are aiming for with this project but I think you should consider working on the impeller design. If you are after good pressure gain you should have an impeller with more curved blades. It might be quite tricky to manufacture such an impeller but I’m sure it would do great on the pressure readings. Rule of thumb: The straighter the blades on the impeller are, the more the the impeller will act as a fan (more flow but less pressure). Unfortunately with these tiny dimensions the resistance for the airflow will be so high that not much flow will be accomplished anyway. With this setup you will need a good defusor right after the impeller to convert some of the airflow to pressure. With more curved blades the impeller will instead compress the air (for the cost of some flow). With higher pressure allready when leaving the impeller, the airflow will be less affected by the tiny dimensions of this supercharger. Looking forward to see this project continue

Man you are one heck of a machinist..I'm working on getting a lathe and a small mill and hopefully one day I'll be as good at it as you are..until then all I can do is practice practice practice..that's the only way to get good at anything..

I think a screw compressor would do the job better

remember when you restored your nitro rc car well take the nitro engine out and out the 4 storke rc engine in it

I could sit and watch this guy all day long!

Johnny you didn't have to say the thing catastrophically failed. But you did. It made me laugh, and I loved your honesty. This video is amazing

Titanium gears, or some other stronger metal than brass

19:50 is it CNC

Your engineering is on point

That is so awesome. I have been watching from the first video. So much work been put into it. don't give up. But I think at 140000 rpm that poor gearbox needed some lubrication. Great job keep it up

Why dont you take some gear box from some old russian (CCCP) military device? They did more durable things.

"Gearboxes we're harmed in the making of this video"

Brass gears at those speeds and with the repeated ramping of the motor I'm surprised it lasted as long as it did. Great clips 👍

Your work is Amazing, I am very impressed!

Naturally aspirated is the way to go it seems😁 Great effort though. Keep trying👍

So sad .... All that work gone for nothing! 😢🤦‍♂️

thank you for finally deciding to do a roots style supercharger

I love watching the trial and error on this. Your so close and I think a planetary gear set would be your best bet for gearing .

Dude. You have to stop screwing around with brass gears. Brass is not a strong enough metal for your application. Consider how much force the impeller must exert on the air to compress it, and then consider that the gear connected to the electric motor has to withstand _17.2 times as much force._ You require steel gears -- preferably in a planetary arrangement to distribute the load across more gear teeth. Those cheap no-name servo gearboxes are a complete waste of time. Alternately, skip the supercharger concept entirely and build a turbocharger instead. Your rotary engine is a 4-stroke engine, so it can still work if the exhaust has backpressure from driving a turbocharger. Then you won't need any gears at all.

17:22 - I'm in the kitchen at 3 a.m.

I think your impeller design needs revision but now that I just seen you say you're likely to build a positive displacement roots style blower, I'm all for the roots buddy!!!! You make such fine great parts bro! Keep up the good work buddy and thanx for the awesome machining etc content!!!! Have a great week!

Getting enthralled in your videos. Fascinating. As far as this supercharger goes, I imagine the centrifugal force on the impeller will want to throw the vanes outward. If they are very thin they may warp slightly and if your tolerances are very tight I guess the vanes could rub/bind on the housing? Fair play to you though for giving it a good go.

Try to built a 4 stroke engine by yourself.

Anyone else literally cringe when he first started hand turning the shaft 😬

these are the videos i am excited about to watch at work.

I can't wait to see the making of the mini roots blower!

18:25 "explosion?"

Use this as a F button

You sir are a very skilled fabricator! I really hope you have success one day!

if you want to build up pressure you NEED a stator in your housing, centrifugal rotor impeller is use to speed up the air, then the stator convert this air speed into pressure. look at the "Ideal gas law" { PV=nRT } in your case "nRT" is a constant, so if a divergent channels lower the speed the pressur rise