Fixing the 3D Printed Gas Engine (so it runs, like, properly) 

I think you’ve officially gone from “building a 3D printed engine” to “building an engine”!

Love how this project evolves from 80% 3d printed plastic parts to like 20% 😂

You need to rejet the carb. if you take the bowl off you will find two jets. One right under the throttle, called the main jet, and one in front called an idle jet. Turning that screw does basically nothing, and is only really meant to fine tune it at idle. The main jet limits fuel at high throttle, the idle jet limits fuel throughout the range. You need to go up a size or two in idle jet, and a few sizes in main jet. The needle can also be moved up or down to give it more or less fuel, and sometimes you need to change the needle out for one with a different shape in order to fine tune it so it runs good at all throttle openings, loads and rpms. Properly tuning a carb is an art, but getting it good enough to run ok is easy

I love the switch from freedom units at buying to metric for precision machining

Once it's complete, I think it would be cool to recreate the same thing but all metal.

just fyi, you can make the case 200% the current strength in the axis it's shearing just by rotating the print on its side

Insta-liked faster than I ever have. Used to have a friend named Camden, he’s no longer with us. I miss him, he was a good man.

Crazy how the engine went from running on hopes, dreams, and starter fluid to actually being able to idle on just gas. The project truly has come a long way from the blocky plastic days

9:44 after comparing to "3 Hours of Volkswagen 1.9TDI idling ASMR, relaxing sound", I can confirm that genuinely sounds almost exactly like a 1.9 TDI idling.

“But I figure if there’s both fuel in the engine and in the fuel then I’ll be okay.” I haven’t ever laughed so hard at an engineering video I love it

I studied machining in college, and it looks like you need some oil to lube up the cutter. The feed rate, which is turning speed and turning speed combined. Your turning speed depends on grade of medal.

8:08 My boy, you should go back in time. Engines were pretty much simple affairs back in the day. Sandwiching the bore between two plates with 4 bolts would've been sufficient. No need to weld as long as the fitment is good. 13:11 when you don't have the spreader tool, you just take a pair of scissors you don't like and cut hooks (facing outwards) into the ends. Those hooks hook into the ends of the ring and spread it. With one hand you spread the scissors and with the other you keep the ring aligned and guide it unto the cylinder.

Definitely look into adding a crank case ventilation valve or line, just so that you don't end up with the lower end being any more of a pressure bomb than it already is with the crank trying to force it apart

I don’t know if you still check these comments. See how it ran better on propane/when you put your fingers over the intake, that means it’s running WAY too lean. Richen up the idle screw. And also it smoked when you gave it throttle which is usually too rich. So lean out the high rev screw.

I’m a motorbike mechanic and specialise in classic and vintage 2 strokes and this is the first time I’ve seen someone put a 2 stroke piston in a 4 stroke set up ☺️ good on you tho for never giving up on the build 👍

This series should be called "3D Printed engine becomes more and more metal"

You should consider getting an end mill. Then you can bore out a cylinder into a solid chunk of metal. You can also cut keyways. You could also make a connecting rod out of a solid chunk of metal using the mill

Genuinely underrated channel

1 hour TBO engine

its too emotional to see her running 🥲

i cant wait to see this engine actually doing work, running something, but i don't know what at this scale, maybe a motorized bike?

Why don't you add an Aditional watter cooling system? The pump can be runed on from the engine or yust separatery.

To fix that bogging, take out the slide from the top or the carb, and there’s a needle that you need to move up. That needle blocks the main jet so at any other throttle position than wide open, it’ll have about the same AFR.

0:43 Missed opportunity.

make an engine that gets 100 running hours, I would love to see you try to do some reliability engineering

Schrodinger's "3D printed" engine

This is the RU-vid I love most. No fancy 6-axis CNC machine, no fancy machinist certifications, just a dude with a $300 lathe, a cool idea, and a LOT of patience.

Silicone based oil is good for plastics. Regular oil will eat through plastic. So maybe you could try using something like WD-40 silicone.

Putting those bolts all the way through and down into the base was the ultimate final addition to your creation. It essentially clamped itself together. Rather Than explode itself apart from little plastic screw points. You knocked this out of the park. That lathe really came in handy

That flywheel is an accident waiting to happen.

I will do 1 push up for every like

HOLY SHEET I JUST WOKE UP I HAVENT WATCHED THE VIDEO OH GOD

I love the bringus studios style editing, gets me every time

The engine looks really cool, good work but could you mabey make it a 2t

Haven't watched the video, can already tell it's a banger.

that hammer project..... Fucking *_SAME_* I at least had the head and body made, just didnt have the threads done in time. wait that is around the same time as mine........why do I feel old!?

Cool... now make a w24

If you end up designing a new head, you should do rotory engine style vavles🤔, but someday i want to see you add more cylanders.😅

was waiting these last few days for it to drop lolz

Hey there man. I love what you're doing but for the love of God please never use 5w30 oil to mix in gas. You should use 2 stroke mixing oil. My rationale behind this is that the oil you've mixed isn't designed to burn. 2 stroke oil is designed to burn. The oil you've mixed is designed to lubricate bearings. That's why you put it in the bottom end of your motor.

More cylinders bruh))) mabe more cylinders will help with staying running, and also, a mechanical fuel pump may be a good upgrade. Now I want to make my own straight six

Maybe instead of mixing just straight up motor oil into the gas, you could try mixing in some Rotary Engine premix? That's designed to lubricate engine components while being burned, so maybe it'd work

19:35 your mixture is too rich, work the other way around, go from no gas to the smallest amount it will start on dry. After that let it rip and adjust the screw until it is smooth, so basically for you until it breaks.

The King of Random channel has a couple different videos on how to build pretty good foundries for a decent budget.

Please please please!!. Make a nitro rc engine but a home made one i ve been waiting for someting like a home made version almost forever

3:50 you SPEED was too high. Your rpm. Fed has nothing to do with the chatter.

I think he should make a gear box for it and see how well it goes good job for making it work

You've got one hell of a hitchhiker's thumb!

That is so awesome, I've been wishing for years for someone on youtube to build their own engine, great job getting it to run.

You need to adjust the tickover it’s the top brass screw next to the mixture screw

Can we engine swap this into my Fiero

Lathe open up a shit ton of options! I got really lucky and grew up in a machine shop, my father was an engineer and owned a giant inco lathe and a Bridgeport Mill from the 1940s. Let's just say I got into doing performance stuff on cars real fast! I would read more small motors on go-karts and dirt bikes. I finally was able to get the tiny hobby lobby for my shed from harbor freight but I still am looking for a tabletop now! I miss those days of machining, it was literally like art with metal

I actually like how this transitioned from a 3D printed engine to an actual engine. I see it as a great way to prototype certain parts. You could take this even further and slowly fabricate each part in metal with plastic prototypes!

the fuel to air ratio is too lean i would recommend making a choke for it

I wrote this a while back on your VVT video: "I would also like to see one scaled up and used in a small vehicle, like a dirtbike, four wheeler, or gokart." are you still thinking about doing this? It had ~200 likes and got a heart from you, so I believe you saw it.

far from 3d printed now, but still a blast to follow and learn about! I'm surprised the bottom end is fine! You must have a serious passion for this now xD

WOW im so glad to see this return!!!!

Using needlenose pliers to tighten nuts. Takes me back to my crazy 90s kid projects!

I’ve never seen a black iron pipe look so nice. Even the new ones usually have a little bit of rust. Fun fact, Dawn dish soap will aggressively rust black iron to a nice bright orange in like 24 hours. (Leak tested a new outdoor gas line and forgot to wipe off the soap)

Babe wake up, Camden Bowen just posted 🔥.

i've been waiting this video since months, thank you Bowen

The engine has a nice idle sound tbh

Impressed you got the rings on first tries, those sneaky bastards love to break.

Congratulations for this build ! I see a lot of things I would have done in another way, but I have only modified and tuned a lot of engine not built my own... So do your things your way and keep on building cool stuff !!!

Now you need to turbo it!

if you ever want to make the engine larger, use some DOM steel pipe, there's no ridge in it, and is already smoth. might just need a honing and your good!

To mesure precisely a piston you gotta take the mesurements on it's skirt since it"s a little bit wider due to the expansion of the alloy on it's crown, the top heats up lot more than the skirt

you sound like the how its made narrator

please make a 2 stroke next i wanna hear it!

As soon as he said "weld", i cringed, because that beautifully milled pipe was now not gonna happen. Hey, its practice. Tuning small carbs can be a nightmare. Yours turned out great! Edit: Love your stuff, man. Very thorough, realistic videos. Thanks for showing the WHOLE process!

Maybe Dom pipe would be a better start

The worst part about projects is when you change something and it stops working lol

Can you make a twin cylinder?

1.9 PD ❤

Bro so cool! been watching this series from the story and I love how this eloves! I would really like to see atleast another video with this engine when you will upgrade it to its max so cool keep going! :D

make a 2 cyilined v shape now

Guys, I think he likes his lathe

Next video its a v8, right?

Как жаль что я не знаю английский

Probably because it's already powerful enough to actually break the crankshaft that you made. Time to 3d print a metal bottomend, and make a better crankshaft. Use your lathe to make one perhaps. It's bogging down because it's either too lean or too rich. (lean = lack of fuel, rich = excessive fuel). Opposite for air. (more air = leak, less air = rich). That "fuel screw" is the air screw, it's on the filter side, so air screw. If it was on the intake side, then fuel screw. It's for idle to quarter throttle, working with the pilot jet. You just need to change the main/pilot jets lol.

Can you try 3d printed rotary engine?

Alternative way of mounting your cylinder, would be to make a "top-hat" liner a cylinder with a rim around the top, to be seated in the engine block.

make a two cylinder two stroke engine plzz

Now make a 2 cylinder engine

Make a V2 3D printed engine ❤

Studs from the top down.

Congratulations on completing this project. I’ve been watching since the beginning. Your videos helped me get through really tough nights alone when I was going through chemo the past couple years. Thank you

I wonder if part of the lower block cracking was due to not having any crankcase breather on it? (At least from what I could tell.) If it has enough of a seal to get good compression, it'll compress that volume of air regardless of which side of the cylinder it's on.

ROCKET ENGINE NEXT TAP OFF CYCLE ENGINE where the engine feeds its turbpumps therefore feeding the chamber with propellant

To quote my college scene shop supervisor: ‘1-1/2” Schedule 40 pipe has no dimension that's 1-1/2”, unless you cut it to 1-1/2” long.’

when you tune a carburetor, make sure you dont have any air leaks, mainly 3d printed parts have microscopic holes, which will make it have a bad air leak, air leaks can cause it to run away, stall, and not even start

The screw closest to the front of carb is an air Mix screw. The one further back is fuel mixture. Try adjusting while running. Love these videos!

please never stop improving this engine

First Off... AWESOME BUILD! You just got one more subscriber! I know I'm late to the game and somebody probably already said something, but that fuel delivery system to the carburetor appears to be a little problematic. The way you have it set up, you're dependent on a siphon effect to keep the fuel flowing and if the float bowl is vented in any way, this just won't work effectively. With out the aid of a fuel pump, you're going to have to put that fuel line at the bottom of your "fuel tank" therefore allowing gravity to be your fuel pump. Also, you might want to raise that fuel tank a little higher so that the bottom of the tank is several inches above the top of the carburetor. Keep up the awesome builds! ~Rich G.

vw 1.9 tdi killed me 🤣🤣🤣🤣🤣🤣🤣

You should have the valve timing so the exhaust begins to open right before BDC, to reduce load on the engine. Also make an inline 6 with this architecture and run a go cart with it!

It’s absolutely insane to see the amount of work it takes to make something comparable to a big weedwacker you could buy at lowes for abt $150. Good work though, reminds of of iron man, “he made this in a CAVE with a box of SCRAPS”

Brotherman, just set the slowest feed, bore that thang out 0.2mm below the finish size then make the last 4 runs would be 4x0.05mm, which you can also measure

As a goofus who disassembles engine just to check if one o ring is seated correctly, just to worry about how it seated after assembling after just checking this video was so enjoyable, watching you make 6? cylinders and everytime just going a bit further 😂😂 i know it wasnt fun for you after about that making 2nd one, this video ws very fun and enjoyable to me… And the bottom ends exploding! 😂😂 why didnt you make your own piston? Love the video…

0,13mm piston to cylinder clearance? Way too much even for a rev happy two stroke. 0,06mm would be good. You will get piston slap