Riding A Two Stroke Diesel Moped With Variable Compression!

[@Failure_Is_An_Option]

If the crank case (including the crank seals) are not air tight you are going to have a heck of a time obtaining any sort of operational RPM band. Depending on the size of the leak it will light off and only be happy at a specific RPM and a dog anywhere under or over it. You mentioned having the fuel screw all the way out... My bet is you are compensating for a lean burn condition due to un-metered air entering the crank case. Which on a compression ignition engine is going to be very lean.

[@julpul02]

Yes i also think that it has an air leak somewhere.

[@eyeswideshut7732]

fuel all the way out, i thought about this one, he said the tank was not the original, look at the cap, i do not think the cap has a hole in it, and the fuel does not come down the pipe because of vacuum pressure holding it back,, just a thought....

[@roxannrousealvarado4645]

I agree completely

[@anwarabrahams2413]

​@@eyeswideshut7732exactly wt I was thinking 👍

[@eyeswideshut7732]

@@anwarabrahams2413 i would dial the mix screw back in and i would run it without the cap... that is the next job lol👍

[@markifi]

i think it's only meant to just help you over the hill. 0.75 horsepower is about adult sprinting power so if it has that you almost don't need to shift down as long as you keep pedaling like a regular bike and it's perhaps under a 6% gradient climb. omitting shifting mechanisms gives you ~15% extra efficiency compared to, say, a 3 speed hub. the whole contraption is fascinating. i think a lot of us watchers have been thinking of very small engines on bicycles for a very long time. the 50cc kits are more motorcycles than assisted bicycles. if this were available, economical and a little less finicky than this, it would be literally perfect. it doesn't even need to be always on as it's small enough not to need a kickstarter. it's a brilliant little engine

[@mfbfreak]

0,75hp is well over what an average cyclist can deliver. My place of work has a cargo bike with 250w motor and it can easily do much more than you see here if it would've had a hand throttle- even though it only has about half the power.

[@markifi]

@@mfbfreak i think these ebikes are rather under-labelled. i don't mean sustained power, just sprints. mine is about ~1100 watts (measured by a power meter), but of course only for a couple seconds, and i'm barely above average

[@thefunniestfarm4731]

My 53cc 3 speed bicycle isn't a motorcycle, it can only go 47 mph max with my current gear ratios. I am able to gear for 55 mph, but I don't like how it exits turns.

[@markifi]

the problem is it's no longer a bicycle because comfortable pedaling could no longer be done@@thefunniestfarm4731 you could possibly put a very wide bottom bracket but you're still pedaling like you're straddeling a horse. i'm thinking regular sporty bicycle, only a bit of assist. but for that we need the normal q factor of under ~180mm. your engine is way too wide for that

[@benei6469]

@@thefunniestfarm4731 your point being? the early super cubs went that fast.

[@route6295]

This type of motorised bicycles called Hühnerschreck That thing made chicken afraid 😊😅😂

[@charlychimpo820]

Great to see it run! Would love to see more videos featuring this little engine, perhaps getting it to run as well as possible and measuring top speed on a straight with different fuels. Either way, keep up the good work 👍

[@SeasideGarage]

Thanks! could be fun!

[@anthonyrstrawbridge]

Ja, und Kompression messen, Kraftstoffventil reinigen und Dieseltank unter Druck setzen

[@sebb_s]

One interesting detail is the fuel tank who seems to come from a Motobécane AV3 who is a little post war French moped

[@egustafson]

The wonder of engines is figuring out how one that's unfamiliar works. Cool process 👏

[@marcos1555]

that's the thing we get the pleasure of seeing something like that but running as well. Minty goodness !!

[@EssenceRare]

Self growth, harvest and oil production sounds like something fun to watch!

[@SeasideGarage]

I could live stream from the field! :P

[@trevortrevortsr2]

An Indonesian guy had one when I was a kid I think he used heating oil and I saw him preheat the barrel one day when I was a teenager he changed it for an early OHV Honda 50 cub and was far happier!

[@dotonthehorizon9620]

Glad to see YT is recommending this type of stuff to people. You deserve the views and its very interesting to learn about old tech

[@garethmilne6887]

I looked up about this engine and found the following about the fuel...The engine usually runs on a mixture of gasoline, petroleum and lubricating oil. Petrol station petroleum is doing fine and a mixing ratio of 1:40 (petroleum: two-stroke oil) is no problem with the current 2-stroke oil. Absolutely love this. Please try that mix and see how it runs ❤

[@billdoodson4232]

I shared the last video on my FaceBook page to my Motorcycling and Engineering friends, quite a bit of comment about it. I shared this one before 3ven watching it.

[@damianbutterworth2434]

I got attacked on line commenting on German engineering. I was saying they go over the top. Well I still agree but love it. We built a 4 wheeled pushbike which folded when we went round a corner just to get to a pub 6 miles away. We had to sleep in the car park.

[@edreiner6483]

I like the poster

[@bigpig187]

That's the first time i see someone make a oil mix with diesel ! very cool it reminds me of small cox engines

[@kermitdk4509]

Really love to hear and ser it running 😊

[@nathansealey6270]

Technically I think its called a semi-diesel engine similar to the vintage model aero diesel engines which used paraffin and ether as well as a contra-piston. Either way its a compression ignition engine so technically yes its a diesel engine 😁

[@atvheads]

In my opinion, a semi diesel is a glow plug engine, where the glow plug has to be connected to a dc electric power source to start the engine. And then the glow plug is continuously glowing, thanks to the combustion. This is a real diesel, because it self combust, or tho a 2 stroke.

[@justso1823]

The model aero engines don't need a glow plug it's the either content that keeps the ignition temperature. The smaller the model engine the higher either content is needed

[@justso1823]

Don't forget the castor oil

[@atvheads]

Any oil will do, if it mix with rhe rest. I guess that you are thinking about methanol, that doesn't mix with certain oils.@@justso1823

[@Burnsidef250]

​@@atvheads Glow plugs on diesels don't run after the engine is started. There were some engines, notably the Lanz Bulldog, which used hot bulb engines, which were not compression ignition.

[@pmprasinos]

This thing is super cool to me. Love the controls and the way it looks.

[@DarkIzo]

oh wow, just saw the first video on the 18cc diesel great timing

[@SeasideGarage]

Perfect!

[@williamrgrant]

Same haha!

[@henktulp4400]

How nice!!!! This bike has an engine but will stil keep you fit at the same time!!! But to be honest.... you have an absolutely UNIQUE bike!!!! And I love your approach:be careful but practical.... try it,test it,use it ENJOY it....... but don’t break anything. I’ll be following your channel FOR SURE!!! Greetings,Henk-Holland

[@rocket99dan]

I've had a lot of luck with vintage 2-stoke engines that are hard to start by adding castor oil or castor seed oil. It seems to help compression and apparently protects the engine like no other oil from what I've read.

[@discontinuuity]

Castor oil turns into sort of a gummy resin when burned, which helps to seal the piston and build compression.

[@ChrisEbbrsen]

The castor oil idea sounds like a good idea. I think it would help bring up compression loss. Just remember old Norton motorcycle engines have to be put together just so or they blow up! I'd hate to see your cute little engine meet an un timely demise. You need to talk with an expert antique engine authority! Im just an opinionated enthusiast! Good luck! Hope she purrs like a kitten!

[@ЮраЮра-т8х]

Авиадвигатель гном работал на смеси с касторовым маслом, оно не растворяется бензином.

[@zaxarrrr3659]

We asked and you delivered man, thanks

[@densamme1752]

Saw a similar one in northern Sweden it had a bike tire valve on the cap and you where supposed to pump it up with air if you used thicker fuels. Otherwise you opened an other valve on the cap to prevent airlocking the tank.

[@Psychx_]

That rural part of Denmark looks like lower Austria - I feel right at home. Greetings!

[@BarefootBill]

I am amazed that it can still attain sufficient compression! Thank you for the videos! RC fuel!

[@black98rt]

Fellow nerd that’s fascinated by unusual things here. I was hoping there’d be another video on this engine. Thanks for posting.

[@tda2806]

This is fun, please keep making more videos about this little engine!

[@David-oi7im]

... yeah dude, this is practical combustion engine history and it got my attention,, so thank you for sharing your hard work and I also enjoy your pace.. In other words this gear head was entertained... Good job!!!

[@MrBIG4D]

That is really cool! It has been my experience with the RC "diesel" engines that you have to fiddle quite a bit with the compression adjustment to get it started, but as the engine gets a little heat in it the engine is not as finicky with the compression setting. I do know that once they are warm and the compression is adjusted, you don't have to touch it again that day if you use the same fuel. The engine speed is then adjusted with the needle valve. The servos work that valve in and out and there is no slide to adjust the air (like a real diesel). Some of those guys are able to really get them to idle slow. The "diesel" engines swing a larger prop that the glow engines so there is more flywheel effect. Once you get it running and get it warmed up, you might try finding the compression sweet spot and then just adjust the engine speed with the fuel only and leave the compression alone. One of the "Old Guys" told me the only reason the compression is adjustable is to compensate for two things, piston to cylinder wall leakage and barometric pressure. I would love to see this thing running good and see if it will idle. Very cool project. P.S. - Stick you a little piece of copper (or other metal) on the exhaust outlet to route the exhaust away from you....

[@thefirstbushman]

the algorithm brought me here and the videos made me stay dude

[@michaelgillett5477]

Thanks for that really enjoyed it. We have one of these in our museum in England and I’ve also also heard about these engines. Never seen one run a Dutch gentleman we had in the museum one day said he had one when he was first going out with his girlfriend, and when her father wanted to get rid of it at night, he would say the blowtorch is going. Are you going home are you peddling and he would warm the engine up for him, but only if he hurried, it was an excuse to get rid of him, but much appreciated and enjoyed your video. Michael from England

[@joemod2000]

Absolutely brilliant. Love this. Well done.

[@georgesendall3733]

Around 1951, the son of a local bike-shop owner ran around with such a bike and I always wondered what it was. I think I've finally found out.

[@damienfaust2108]

Thank you for the update...

[@richardschaefer3889]

Yeah, had to find the next episode of this little engine. Really, really, neat.

[@------country-boy-------]

Really interesting!!! My dad was from Denmark and worked at Lego while they still made wood toys. They were just getting into plastic bricks when he left. The danish government sent him train tickets to go to jail for 2 years because he did not want to join the army. So he went to Sweden to work and saved up for a boat ride to Canada. Long story short - my parents retired in Belize 16 years ago. He sadly passed away in 2021. R.I.P. dad. Anyways great videos !!! Watching from Table Rock resort Belize 🌴🌴🌴🌄

[@jankatsman6319]

Around 1960 a classmate drove one belonging to his father. It was very difficult to drive it, since the compression had to be changed load depended. The maximum speed, no wind flat trajectory, was about 60 km/hour. Fuel consumption was ca 100 km/ l. During wintertime, temperatures bolow 0 depressie C, it dit not run at all. Trying to run it on petrol resulted in an exploded cylinder, fortuanetly noboddy was hirt. That was the end of the Lohmann. Hope you Will have a lot of fun with your Lohmann

[@jjohnson6252]

What an odd, interesting machine. Great video!

[@regal_type]

I jokingly refer to my Mobylette 50v as a "bicycle with a weed whacker engine strapped to it" but this machine feels a lot more accurate to that analogy. Greetings from the US!

[@tissuepaper9962]

and the funny part is that most weed whackers have significantly more displacement than this (like, 30-50% more), despite requiring much less torque to operate. Diesel power, baby!

[@Knapweed]

It's very satisfying to see the old girl get a second chance to strut her stuff. Good job!

[@PotatoesAssistant]

Trying Propane injection could a be really neat experiment with this little engine, it would probably combust the kerosene mixture much more efficiently and less Smokey on top of maybe making a little more power

[@jimmytclem]

The algorithm sure did win with this one.

[@ShaunMurray63]

That little bike is epic.

[@twocvbloke]

Certainly a finicky engine to keep it going, but a fun little thing to have nonetheless, would be interesting to see how it ran with different fuels, considering Rudolf Diesel's oil of choice was peanut oil, rather than the industrial waste product that ended up being referred to as "diesel fuel"... :P

[@CawKee]

Probably an engine you'd get to know with experience

[@billyporter2195]

Fascinating project admire your enthusiasm. I’ve just got home from 10 mile ride on 1955 NSU Quickly, which I know you are familiar with. I averaged 20mph but that was pedal assisted against headwinds, still good fun though 👋🏻

[@damiancaesar1686]

Fascinating, thank you for sharing.

[@buddyletendre]

This is so interesting! Even if it’s not the most practical, I would love to see a reproduction, or even a modern take on a setup like this!

[@CawKee]

You'd need it to go fast enough to out run the eco extremists, they'd go nuts if they saw this type of engine getting used through town

[@viceroybolt3518]

Frankly the bicycle itself is a bit of a wonder! I'm curious how much you're fighting with the motor and how much you're fighting with what looks like century old bearings!

[@dinkc64]

Wow! Such a fascinating little engine! Thank you for taking the time to share your experience with us. Hello from Detroit!

[@hiha2108]

I know the Lohmans quite well, and I strongly(!) recommend to use normal Jetfuel (Jet A-1) instead of Dieselfuel or Petroleum/Kerosene, because modern Petroleum for safety-reasons has a lot higher flash point than in the early ages. Dieselfuel also does not want to ignite under such conditions very well. Jet A-1 has a flash point of 38°C. You additionally can add some 5 to 10% of diethylether, which eases Ignition, and for liftig up the CETAN-number, add 1% 2-EHN (2-Ethylhexylnitrat). If you look for fuel-sources for self igniting model-engines ("modeldiesel") you will find similar reciepts. Some Vintage-Modelers and control-wire-combat-modelers sometimes still use Diesels. Good luck!

[@Larpy1933]

Yes, I agree - trying fuel for glow plug model aircraft engines is worth a try. Back in the ‘60s, I used to mix my own fuel for a Cox 0.049 cubic inch “Babe Bee” engine. I used methanol, some ether, and castor oil for lubrication. As the commenter above mentions, model airplane fuels contained some nitromethane in the old days and that may be true today. Changing your two controls over to thumb-operated levers may be a benefit. “Thumbies” are old-school shift levers for 1980s mountain bikes and are still available. With the twist grips, it’s clearly difficult to maintain a setting. And tricky to have any repeatability for settings. Good luck and thanks for posting both videos.

[@EricaMTB]

Jet A1 is kero

[@nerd1000ify]

@@Larpy1933 There's a bit of a difference between a model diesel and a glow motor. model diesels (and this thing is basically an overgrown model diesel) have a movable counterpiston in the top of the cylinder that allows adjusting the compression ratio. They have no glow plug, and ignite using only the compression of the fuel mixture, vs a glow motor where the methanol undergoes a catalytic reaction in the presence of the platinum glow plug wire, causing the wire to glow and act as a 'hot spot' to ignite the majority of the fuel. Model diesel fuel was usually a mix of castor oil, kerosene and diethyl ether. You would start them by winding the compression screw in, which raised the compression ratio, then flipping the engine over. Once ignition happened you had to adjust the compression screw for best running, it basically acts as the ignition timing (more compression = earlier ignition).

[@hiha2108]

@@nerd1000ify You are right. Fuel for glow plug engines does NOT work in a compression ignited engine.

[@hiha2108]

@@EricaMTB "Kerosene" in the USA, as used in outdoor-burners has a higher flash point than Jet A1. In Europe it is called Petroleum, which also has nowadays a higher flashpoint.

[@davidholleley9828]

I have a MV Augusta 750 that for many years was voted the world’s most beautiful motorcycle- they obviously hadn’t seen your machine! 👌😅🤗from Oz

[@regurkilu]

My father told me about the Lohmann engine when I was a child. I have been fascinated by them but never actually seen one until your video. Thank you so much for sharing this.

[@vancemacd6315]

Very different, thx for showing.

[@kevinavillain4616]

I must admit that I really love the idea of this engine. Of course my first thought is can I build one 😺. I have several washing machine engines Briggs & Stratton that have a super simple fuel drip system like you're talking about on that engine. These were Maytag engines for Amish washing machines. Looking forward to finding out more about that unit and some of your upcoming videos as I review the older ones.

[@theLyzhendricks]

Ive heard frome older people when they where kids thst they used to use those washing machine motors and but them on go carts scooter mini bikes sounds really cool wish their was video back then like their is now

[@delukxy]

kzbin.info/www/bejne/iKm6kKx6q9RjasU Mustie 1

[@TheLawnmowerLady]

This is awesome! Thank you for the video!

[@ttausdanmark]

Got the first video on this moped recommend by the algorithm, all hail the algorithm. It took a moment to figure out the accent was Danish, like myself. As a former postman, I couldn’t help myself from looking at the roads you were driving on, trying to figure out if I recognized anything. And by some freak coincidence, you were driving on my old mail route. Anyway, love the videos, keep it up👌🏻🇩🇰

[@kasuraga]

Small world! I have the same thing happen when I realize someone is in my state haha

[@proelitjump1355]

Small world huh

[@metricstormtrooper]

Me too and I subscribed in seconds.

[@limyrob1383]

I had a BSA "Winged Wheel". These were a tiny engine in the rear wheel. It could power the bike along on a level road and give the rider a rest but it was useless on hills. On a hill it was just extra weight.

[@route6295]

Well done... 🎉 Best regards from Germany

[@taylorsutherland6973]

This thing is absolutely awesome!!!! Great nerdy bike!

[@theLyzhendricks]

I found ur channel because i was looking up motorized bicycles i built a motkrized bike 2 days ago 80cc 2stroke but this thing u got is super cool

[@brianyoung9014]

It's a pretty unique toy.

[@BillyBob-uc9zp]

Very interesting. Thank you 😎

[@williamarmstrong7199]

I had a compression ignition 2 stroke RC motor back in the 1970's or late 60's. It ran on a nitrated ether mix with casteroil. It was very hard to start it without it back fireing and wacking my fingers with the prop! Try adding a little ether (in cans of "sure start" used to start reluctant diesel engines) or a lot of it. :) that might help a lot.

[@liamwatts8597]

Whaaaaat?! This is so cool! Thank you for reviving and sharing such an interesting moped!❤

[@Orbacron]

With a rear wheel stand, you could start with drill, and move forward off of stand with feet. You need drill rachet extension like mustie1 channel has to prevent any stress on your engine starter shaft threads.. And you are mobile with a really amazing retro bicycle

[@MegaTubescreamer]

you did vry well gtting it to run and contribute to pedalling effort, 😊👍 keep it up,

[@Theunknownman52]

Thanks for the video. I would like more videos about the bike 😊

[@jeffter2471]

it's starving for fuel. when I was watching it come straight from the tank it looked like a slow slow flow. probably why when it was run on diesel it would rev and die rev and die. very fun to watch I wonder if they still make something like these or if a 2 stroke could be modified. in any case very cool content and fun to watch thank you . .

[@andyarmstrong1493]

Wow! What a weird bike, I love it. Reminds me of a Royal Enfield we had years ago. When I watched the opening shots, I thought the stepladders were some sort of backrest.

[@joneserupinsmoke9161]

Yea man I love two stroke engines

[@louispaxeco6931]

Great to see this amazing machine, thanks;

[@guerrillaradio9953]

Yes, "technically", it's not a traditional diesel engine, but more similar to an RC diesel engine, auto-igniton type, semi-diesel, but I would argue that it's still closer than one of those due to the fact it doesn't need diethyl ether in the fuel (and in something like a 30 percent quantity). It's not a hot bulb engine either! (although, those are really cool too!)

[@hummelspatz]

I would certainly try to add ether in order to make the fuel easier to autoignite. For oil, we used to mix pure castoroil in.

[@hummelspatz]

There must be some information on fuel recepies for those Webra 1,5 and 2,5cc diesel engines

[@Driver-UK]

Thanks for this video very informative and interesting .Andy Manchester England 👍👍

[@metricstormtrooper]

Appreciate it, I live for weird stuff like this😁

[@sunfishensunfishen2271]

I would gladly own and maintain one of these, too bad they don’t have them in the states

[@lettuceman3848]

Try using some full or semi-synthetic oil and mix a 1-25 or 1-30 oil mix, also try soaking all the fuel related parts in paint-thinner

[@ronalddaub9740]

That's the coolest thing I've ever seen

[@andersson.l.e]

Interesting engine. Nice video.

[@timdryden3778]

Great stuff!!

[@moritzhahn4130]

According to the factory, this thing should run about 25 km/h on a flat road. A warm and well-adjusted motor should make up to 35 km/h.

[@tissuepaper9962]

Seems like the RPM would be uncomfortably high at 35 kph, maybe the roller has worn down and reduced the drive ratio between the engine and the wheel, or maybe this thing is supposed to sound like a vacuum cleaner at full tilt. Future videos may tell.

[@bor3549]

I believe it may be similar in principle to a hot bulb engine, in that a red hot element keeps a flame front going inside the head. And that's the difference too-ignition propagation takes place IN the head here, whereas as, in a hot bulb the heat for ignition passes through its iconic EXTERNAL bulb.

[@flooded42]

when I was running auto ignition two strokes engine (for RC planes) I was using 1/3 gazole, 1/3 ether, 1/3 castor oil

[@ebbeweber1310]

I have a old bike with a Victoria auxilery two stroke 0.8hp petrol engine. Compared to the Lohman it really gives you good speed, aprox 45km/h. It has two gears and drives the rear wheel by chain.

[@craigpierce7996]

Sounds like the drip fuel line isn't getting the proper venting. Try removing the gas cap when running and use it for storage only. This needs a free, gravity drop for the fuel.

[@BrawlerTheSmokyDutchMan]

Awesome dude, was hoping on this video 👍

[@williambunting803]

It would be good to have some one CAD Model the engine. I’m happy to do that if no one else is. I’m in NL.

[@pmfilmsUK]

Fantastic

[@be.ndover]

thats an awesome bike it would be a dream to reproduce it all you need is a put put to get around

[@marknice2793]

Looking forward to seeing you progress with this wonderful historic machine.😊

[@alfieweston945]

Dude first of all you're 100% correct in finding out that there is a niche audience who appreciate content like this, but can I also compliment you on your level of spoken English. The depth of your terminology for someone that doesn't speak English as their mother tongue is incredible! Hats off to you; I've subscribed and most certainly will stay subscribed

[@anidiotinaracingcar4874]

2:45 I agree. (Old) People say the internet is breaking the social bonds but I believe the opposite: I'm having intense and incredibly interesting conversations with people from all aver the world on an extremely wide range on subjects thanks to the internet. Conversations I could not have in real life and I would probably have to talk weather with the old people complaining

[@gabrielb.6297]

The internet itself doesn't but social media is.

[@MitzvosGolem1]

Compression ignition engine Some kerosene in diesel may help it start easy . We use in winter on old engines on dozers Smaller diameter rear wheel would lower ratio to allow it to climb hills at max rpm . Would be a good experiment to try smaller friction wheel drive also. Awesome 👍

[@stevemorris3710]

It drives the outside of the tyre via a roller. So the wheel diameter has no effect on the ratio. They were designed to run on a Kerosene mixed 25:1 with oil so for sure your suggestion on mixin Kero in would help.

[@MitzvosGolem1]

@@stevemorris3710 Actually it would . Rim pull is from CL of axel to pavement contact area irrespective of where motor applies torque . I am a mechanical engineer and familiar with that . Peace out 👍

[@mickangio16]

The wheel diameter sounds like an interesting experiment. I'm not an engineer, but I don't think the ratio would change.

[@MitzvosGolem1]

@@mickangio16 rim pull.... Ft -lbs on edge( rim pull is measure of pulling force developed) increase by decrease in diameter. Ratio between drive gear and rear wheel changes also actually decrease somewhat. Similar to gears in transmission low gear is smaller therefore higher mechanical advantage . Trains Tractors use rim pull to measure tractive effort. On certain farm tractors the pull force is increased by reducing diameter of wheels. In competition pulling one must use stock rim tire size not to cheat .

[@stevemorris3710]

@@mickangio16 And you'd be correct.

[@BETTERTOMARROW]

What a interesting project.

[@millimetreperfect]

Thank you for this vid

[@volvo-express]

That was interesting....no fuel out until you removed the cap, is the tank breather blocked? Just an idea....cheers Brian.

[@SeasideGarage]

It was not the cap but the fuel valve... :)

[@juhajuaranen9576]

ive been waiting this

[@GenerationAI2024]

Thanks for sharing, it's a great little machine. Maybe you can also use tændvæske? It should be the same as petrolium.

[@jimmybritt9537]

Hope you get it running 👍👍🇺🇸

[@georgeenache9004]

that is also the recipe for 1.9 ALH :)) i've asked my father if he ever saw one of these and said he did, it was used especially on climbing hills, so you should try and find that "adjustment" :)

[@drewmurray7102]

Brilliant