Tiny 3.5 cc NITRO ENGINE on a BICYCLE 

NITRO ENGINE:amzn.to/3SE4RIL My 3D Printers Prusa mk3:amzn.to/3SEXr83 Bambu Lab X1 Carbon:bambulab.com/en-eu/x1 Creality K1:amzn.to/4bjM4K3 Prusa SL1S SPEED:amzn.to/4bu7LHA Form 3: formlabs.com/eu/3d-printers/form-3/ CNC MACHINE:bit.ly/3sqTUQm

The cool engine sounds like it's powered by angry mosquitoes. :-)

The fact these little nitro engines can put out 0.6 to over 3.5 hp from up to max of 7cc is insane!

Making your own gears with a 3-D printer - awesome. Joining the parts together using drywall screws - priceless.

As someone who wants to continue to watch awesome Integza videos, please watch a video on tablesaw best practices. Not trying to be a safety nazi, I've just had some close calls and I see some practices in your video that have caused me literal pain until I learned the hard way. I still have all my digits and I'd like you to be able to keep yours too!

How to start: Pull once or twice with air intake closed (finger on) or instead put some drops of fuel directly into the air intake. Makes starting a lot easier.

Worm gears are really inefficient at high speed. Maybe you can make several smaller gears (a gerabox) to achiev the ratio you need. Also make a fixed wing drone with a jet engine.

Tip to start the engine easier, put your finger over the air intake and turn it over by hand a few times. It chokes it and pumps in some fuel. Then start it normally. When you're done, you should empty the fuel tank and run the engine dry, then put some protectant oil in through the intake and turn it over a few times to distribute. 2 stroke oil, engine oil, and engine cleaning and lubrication products are probably all fine to use for storage.

in Uruguay, those modified bikes are pretty common; we call em "Mosquitos", pretty accurate naming if you ask me

Mech. Eng. here. Great video, Integza! Some thoughts: The teflon gear got torn up by the brass worm drive because the teflon gear is resisting the load, so each time the brass worm spins, it digs into the the teflon. Since teflon is softer than brass, it gets chewed up. Ideally gears under load like this should be made from the same material and bathed in very thin oil. That's why transmissions, gearboxes and differentials are designed like this. Another point to note is that you likely are leaving a lot of top-speed on the table using the worm gear with 1:32 gear ratio. Since the nitro engine has 2.5hp and 0.9Nm as compared to the electric with 1.2hp and 50Nm torque, you *only* need ~1:25 gear ratio to achieve the same output. However, because the nitro engine has more hp that means you can trade initial torque out for a higher top speed, and achieve this with an even lower gear ratio. In theory, a gear ratio of 1:13 will get you double the top speed compared to the electric bike. With gear ratios like 1:13, you can easily obtain ordinary gears to use, which will improve overall efficiency compared to the worm gears. The initial acceleration can also be helped by pedaling the bike manually while at very low speeds. Another reason to go this route is that, under ordinary driving conditions, where you are not driving at full speed all the time, you'll be able to feather the throttle to maintain a medium speed, which utilizes your engine more efficiently and dramatically lowers engine wear and tear. 2-stroke engines wear out much faster than 4-stroke engines in general.

If ElectroBoom and Jimmy Neutron had a baby, he would be you.

Worm gears give a lot of reduction but aren't very efficient and wear quickly (because of the screwthread rubbing on the gear). They are more useful when you want to lock something in place or clamp with a lot of force (guitar strings or bench vice). Also they only work one way, and you will need a freewheel or your bicycle will grind to a halt as soon as you let off the throttle.

I still don't know how you manage to make every contraption seem janky and amateur but well made and engineered at the same time. That's a special talent.

That wormgear probably causes a ton of friction and power loss. Maybe you could try and redo the transmission with either belts or gears? All that melted teflon is a big indicator for the friction

I recently got a couple of these nitro engines and wanted to make a similar project. I thought about using worm gears too but decided against it due to their low efficiency, I’m surprised it worked well for you.

For years this idea has been bouncing around in my head! I'm happy to see it manifested in such an enjoyable way.

I absolutely love this!! You achieved what I failed to do as a teenage kid with model plane engines.

Little correction : The Citroën 2CV does not stand for 2 horse power. It stands for 2 TAX horsepower

Crosscutting a 2x4 on the table saw using the fence like that is a great way to lose a couple fingers my friend. Use the cross cut sled for that.

This reminds me of something we have in France ; just after WW2, a bicycle company names VéloSoleX put a 50cc engine producing 0,8 hp on the front of a bike, and they produced it in many versions until the 80's. It's super fun to drive, kinda similar to this masterpiece of homemade engineering and 3d printing you made !

So mosquitoes are powered with this engine..

Whenever I try to learn something from the progress, I only remember "Tomatoes are disgusting."

15:16 The whole difficulty to find asphalt thing is surreal to hear about coming from the US, where even where we had cobblestone roads, we usually paved over them. 😂

My friend, your honesty is beautiful. Your grandfather is proud. 👌🏼

I drempt of doing that to my bike as a kid, great to see you actually do it.

"as my grandfather used to say: you can never lubrificate too much. That's why he ended up with 11 kids" -Integza

These engines are actually fueled by methanol, but the fuel is often doped with nitromethane as a performance additive.

Is it a plane? Is it a bird? NO! It’s a bike with a RC PLANE ENGINE!!! 😂🤣

For those who do not know. What he called a one way bearing is actually called a Sprague clutch ...to help with your collection of parts.

I used to drive a lot of RC monster trucks about 20 years ago or so. Lots of fun... But man, I do not miss all the trouble getting those suckers to run right... These days there are brushless motors in those same trucks and they are SO ridiculously fast in comparison to the old nitro motors. Same fun with 90% less frustration. The nitro motor sounds is like nostalgic PTSD.

They were doing this 40 years ago, remember seeing a guy going up and down the runway at a model show. The Engine runs on Methanol by the way usually with a small percentage of Nitro-Methane maybe 10-15% depending on the engine, also has oil in the mix, we generally just used to run Straight Methanol/Oil mix or 5% Nitro in a model aircraft.

The entertainment value of this video outweighs its educational value, but you know what? I'm into that

I feel like I just went back in time over 100 years ago, and witnessed the creator of the first motorized bicycle, experimenting and trying to figure it all out. Pretty cool. I think this video has made me an amateur scientist/enthusiast.

It is so good that you finally have a proper CNC machine. I wish you many successful projects.

The 2CV was for 2 "tax horsepowers" ("chevaux fiscaux" in French) which is a way to rate the car for various taxes according to several parameters including the dynamometric horsepowers (noted as "ch" for "chevaux", horses in French). That's why you find specs of modern cars claiming, for example, 150ch and 7CV in French car catalogs.

Man the table saw bit had me wincing! Clearly a very clever guy with a good understanding of physics. And then doesn't apply it to a machine that can chop bits off you

Worm gears at 30.000 Rip-ems.. I'mma need me some popcorn for this :D

2CV meant 2 "Fiscal" horsepower, related to how it would be taxed. Indeed, the first one had 9HP, but the one you're showing actually has 29HP. Love that car, I actually have the exact same! Um grande abraço, e obrigado por o vídeo!

Your grandfather left you a brand-new Decathlon/BTwin ELOPS bicycle that retails for €200? He’s a generous man! But seriously, that’s some good work there. As an old-school engineer/mechanic I struggle to understand 3D modelling and printing, but I find it fascinating how you can create complex patterns so easily. That would have taken me many hours on a lathe and mill to make those parts in aluminium. Thank you for an entertaining video!

Pretty cool you got as fast as the average e-bike but with more noise and pollution. Good job!

You just gave me a hint that actually solved a problem that persisted for over 6 month now! I completely forgot about one-way bearrings, this is the one mechnaical detail i needed for my whole design, thank you so so much! I am at revision 5 of this specific mechine and i am so fed up with it, you can't imagine. I will execute a tomato in honor for you!

This guy is genuinely a cool guy.

Geweldig gedaan :) Ik vond het leuk om te zien hoe je dat gedaan hebt.

Great build! The rough road makes it sound like a bleating goat awesome dude!

You always have great informative videos on engines, for a new one maybe compare your engines and suggest projects that can easily be done by many with different engines

Amazing video man, keep it up!

I've been wanting someone to do this for years, glad to see it come to life, I wonder how economical it is ? might need to do something about the noise pollution though !

Great video! More tiny engine builds

If you can reduce the transmission losses with the gear system, I think you'll have no problems with this project. I look forward to the next installment!

Some years ago my son and I got into RC trucks using these "little" engines. I was very satisfying to see you having trouble starting your engine using the pull-cord!!! I have no idea how many knuckes we smacked when we first got our trucks. Even after we started using a drill, it was hard to get the engines to start until we had them broken in! We flipped a truck on a jump once and cracked the engine block (which sucked since we had JUST gotten that engine broken in and running smooth). But it was fun to have an 'extra' engine that we could pull apart and look at and not worry about breaking anything or having to put it back together and have it work. I also have to say, the neighors were not big fan of the trucks!

@3:15 that bearing is probably a one-way bearing that prevents turning over the engine in the wrong direction. They make a cap and bearing for drill-start that you can probably ebay for pretty cheap. Also, your mix seems lean (there should generally be a small amount of smoke exiting the exhaust when correct). If it is lean - keep a close eye on your cylinder head temps with an IR thermometer if you want this engine to last any amount of time. You generally want it on the rich side, especially when the engine is new. Nice job! Very creative!

Them flybys were brutal daaaaamn!

Next up would be making a gearbox that allows multiple gears. You could likely use the gears already on the rear tire and a chain to allow gear switching.

I love this! You definitely did your grandfather proud! I am not engineer, but you definitely, with out a doubt, should have gone with 100:1 ratio. Think of it; if your engine can rev to 30,000 rpm, then the gear is spinning at 300 rpm. I dont know the math but I would guess you could go around 50 km/h. Your engine is riding against the clutch and has not even begun to rev after the clutch engages! It's like holding the head of a weed trimmer stationary while at full throttle. If you do max out the engine then try a 75:1 etc.

Cool video mate, very well presented 👍

If you twist the black ring just behind the chuck of your drill (where the markings are), you can torque limit your drill so that it doesn’t skip on screws (it’ll just stop trying to turn them). You won’t chew out screws as easily, damage the bit or risk stripping whatever you’re drilling into, super useful feature.

Didnt know that Nicolas Cage made motorcycles

So much fun! Great presentation!

Beautiful countryside. Didn't expect this in Portugal.

Now I want to see you building a Turbo for that engine :D Excaclty for that spot where the air flows in.

A good rule of thumb is to only have the teeth of the table saw stick up past the material. You also want to keep your hands on the work peices as the saw stops. Stay safe man!

@5:53: One of the most dangerous moves you can make with a table saw - cutting small pieces off on the right up against the fence. If that piece gets slightly out of alignment it can become pinched and that whole pieces can become airborne... not to mention the insane height of the blade above the work piece. A good way to lose a hand!

Great video! Cool sound! Cool project, though I think it would be sturdier and work better with all metal gears to increase longevity. Though the teflon idea was super cool 😎

2cv came from the "chevaux fiscaux" (varies depending on the size of the car, power of the engine and other factors) and it is what defines the taxes you need to pay on the car. 2cv means it was affordable for the people when it first came out.

We love you integza

That's pretty cool good job

Thank you for showing that the engine is still best in Toy RC cars

Better get a few clutches on hand for spares. If you hear fuel sizzling in the crank case after shut down, she's too lean. If it ever starts to really run great, it's about two minutes before melting down. Nitro wisdom for you. An infrared therm. Is a good tuning tool.

About the actual power of the Citroën 2CV: "2CV" refers to "fiscal power". It is the result of a typically French bureaucratic formula that determines the price of the tax you have to pay when you register your car. The power of the first 2CV was 9hp but the engine has undergone many developments and the latest models such as the one you were driving had a power of 29hp.

😂. I genuinely enjoyed the video my friend. Very informational & and the level of entertaining that you have achieved has the capability to be categorized with the Super Bowl commercials of 2024… I think… I didn’t actually see the commercials this year as of yet but in assumption that the quality is still as good as it has been in the past then I would say I just gave you a wonderful compliment that should have the ability to bring you such joy that you will want to skip from place to place as a way of transportation for a day at least…🎉

Típica aldeia de Portugal! Getting my hand to one of those Bambu soon!

You have to tune the carb mixture screw for full throttle. Every day.

Aaaah the wonderful 2CV. My mother had several of those throughout the 70s and 80s. I miss them.

man - you are a genius!...and beneath that the video was totally entertaining! the sound of the engine is absolutely hilarious...

Had so much fun watching, makes me want to try this myself, aldo i wil use the LRP .32 engien, its a beast!! 💪

My first thought was, you going to use planetary gear box. That would do excellent job of amplifying torq.

More mobility related videos❤️

Oh man I've been wanting to see that for a while 😂

This is good learning but funny as heck!!

You're hilarious, Joel. And informational. And thorough. And creative. And you seem to have cornered the market on sister assistants. Don't worry about not knowing all the right things yet, they will come to you in time. You're remarkably good at implementing field design modifications, prototyping, 3D modeling, CAD, designing around problems, destroying evil tomatoes...things most boys can only dream of. Thanks a ton for all the videos. I realize they represent a significant investment of your time and life. Good job, man. Good job. That Citroen 2CV was pristine! Thanks for showing that.

To take the HP lie a step further, the average horse has about 15HP

Very fun to watch. Thanks

You just unwittingly taught me the difference between Horsepower and Torque.

Hi integza! Please hear me out. Some nitro engines can be purchased for very cheap. I really want to see you buy a few of them and combine them together into a nitro V12 or whatever. You can even combine more to get even more power! Would be really cool to see you go fast!

you should put like 2 or 4 of those in line by attaching the crankshaft or something and make every mechanic happy

I love this project. As someone who has spent more than half their life tuning nitro engines, I am both happy and sad at the sound of hearing one struggling!

I had the same idea :D Nice seeing someone puting it to live.

ill be 70 and still giggle like a little schoolgirl when i hear a nitro engine full tilt just "WAAAAAAAAAAAAANNNNNNNNNNNNNNNNNNNHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH"

I love the fact that while everyone else is thinking electric, you're going the opposite direction. Stay cool man!

You should try changing to a compound gearbox, or chain reduction, worm gears are meant for low speed and have a lot of friction loss, which is taking away from your speed.

A lot of work! But beautifully done, explained, & very entertaining.

First off, love the content. for all the mechanics under us, this is not the kind of use for a worm gear. It's quite dangerous actually, a worm gear is not back driveable, that means if the power of the engine is lost, the back wheel will lock up and make you slide all over the road. With that. A worm gear does not use two kinds of self lubing metals/plastics, most of the time the wheel will be made of brons, and the worm made of steel. Oh, btw, the belt he is using to power de back wheel is a normal V belt made for tight angles, not necessarily a toothed belt used for toothed pulleys. Anyway, don't be mad for this comment, just educating and making sure people who try this are safe, would love to see this tried with a planetary gearbox keep on the amazing content!🤩

For someone who hasn't got a RC car you definitely know how to stop the engine, some people pinch the fuel line which cuts off the fuel but it also cuts off the oil that protects the engine. Nice work with the bike. 😀👍

Plugging the exhaust till the engine first fires is ideal. They create fuel pressure by using exhaust pressure. They even tell you in the manual to prime them that way if you don’t have a primer bulb. I had a handful of nitro cars when I was a kid

When you started yanking, i immediately thought 'prime it'! They can be a pita to start by hand if not primed. Drill starting spins it much more consistently which manages to draw the fuel on its own.

15% nitromehane sounds really low. we used 25% back in my youth days and that was the second weakest available back then. you should check the user manual for what they recommend and maybe play with the carburator settings (factory settings are for a very specific fuel mixture and using something else will change how the engine responds). that should give you more power. if you are afraid the engine runs to hot, there should also be an optimal operating temp somewhere in the manual. oh, and a total redo of your drive train. its a very bad sign if the transmission eats itself. ;) thx for jet another fun vid :)

You should drag race Tom Stantons drone motor powered bicycle!

I kept expecting that little engine to explode or at least fizzle out and stop working. I am glad it survived the whole way!

Opening drive by gave me the I Had Too Much to Dream by The Electric Prunes vibe.

Nitro engines are so powerful