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.
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....
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
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.
@@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
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.
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
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 😁
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.
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
@@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.
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 👍
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.
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.
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!
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 ❤
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!
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.
@@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).
@@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.
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.
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!
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👌🏻🇩🇰
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
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
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.
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
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
... 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!!!
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.
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!)
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....
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!
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!
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 👍
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.
@@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 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 .
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 🌴🌴🌴🌄
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
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!
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.
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
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 👋🏻
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.
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 . .
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.
That's fantastic.. You could try some Ether. Solvent Ether will work. Anaesthetic Ether is probably too hard to get now. If it is working like a model airplane diesel, try one part each, kerosene, oil, and ether. And if you really want to amp things up, a couple of percent of Amyl nitrate. An old bloke at my local model aero club gave me 100 millilitres in the 80s ( heart medication), for my competition freeflight diesel engines, for the nationals. Great find mate. I'll be following your progress. Stu. Melbourne. Australia
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
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.
I love it. I'm really curious to see if it would run on vegetable oil. Imagine growing a small crop of rapeseed, harvesting it, extracting the oil and then running it on it. Would be so cool. I think it will be a pain to get started and possibly even too thick to run without a injector (I still dont understand how the fuel delivery on this works but I'll assume its some variation of a 'carb'. To make starting easier and give some more power you can use a cetane improver (2ehn) which is a fuel addative. I used it on my mercedes that I ran on vegetable oil. Never had a cold starting issue even in the dead of winter.
Vegetable oil takes more heat to ignite. It doesn't' combust completely, and will eventually either bend the connecting rod or break the piston when the combustion chamber gets packed with carbon sludge. If he is having a difficult time with diesel, then vegetable oil is not even a consideration. In addition it will have even less power than kerosene. Kerosene has faster flame propagation than diesel making cetane a moot point. Unless you have screen door fuel filters vegetable oil will not work in actual winter conditions.
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
It's a 2 stroke compression ignition engine I have worked on much larger engines but still small thay used them in small horticultural machinery in the long distance past but I do envy you I have 10 ish mopeds but nothing as exotic as yours 👍
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.
Go back 100 years ago, the ford model t. You could run that engine on kerosene. You had to wrap a copper pipe around the exhaust manifold to preheat the fuel. Cold kerosene would not combust. The procedure was to start the car on gasoline then after the engine was warmed, switch to kerosene. I suspect diesel fuel might work the same way, needs to be pre-heated.
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.
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.
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" :)
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.
Yes i also think that it has an air leak somewhere.
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....
I agree completely
@@eyeswideshut7732exactly wt I was thinking 👍
@@anwarabrahams2413 i would dial the mix screw back in and i would run it without the cap... that is the next job lol👍
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
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.
@@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
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.
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
@@thefunniestfarm4731 your point being? the early super cubs went that fast.
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 😁
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.
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
Don't forget the castor oil
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
@@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.
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 👍
Thanks! could be fun!
Ja, und Kompression messen, Kraftstoffventil reinigen und Dieseltank unter Druck setzen
This type of motorised bicycles called
Hühnerschreck
That thing made chicken afraid
😊😅😂
One interesting detail is the fuel tank who seems to come from a Motobécane AV3 who is a little post war French moped
I like the poster
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.
that's the thing we get the pleasure of seeing something like that but running as well. Minty goodness !!
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.
Castor oil turns into sort of a gummy resin when burned, which helps to seal the piston and build compression.
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!
Авиадвигатель гном работал на смеси с касторовым маслом, оно не растворяется бензином.
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 ❤
the algorithm brought me here and the videos made me stay dude
oh wow, just saw the first video on the 18cc diesel
great timing
Perfect!
Same haha!
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
Self growth, harvest and oil production sounds like something fun to watch!
I could live stream from the field! :P
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!
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.
Jet A1 is kero
@@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).
@@nerd1000ify You are right. Fuel for glow plug engines does NOT work in a compression ignited engine.
@@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.
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.
We asked and you delivered man, thanks
The wonder of engines is figuring out how one that's unfamiliar works. Cool process 👏
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!
Really love to hear and ser it running 😊
That's the first time i see someone make a oil mix with diesel ! very cool it reminds me of small cox engines
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👌🏻🇩🇰
Small world! I have the same thing happen when I realize someone is in my state haha
Small world huh
Me too and I subscribed in seconds.
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
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
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.
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.
That rural part of Denmark looks like lower Austria - I feel right at home. Greetings!
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
Probably an engine you'd get to know with experience
Thank you for the update...
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
The algorithm sure did win with this one.
... 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!!!
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.
This is fun, please keep making more videos about this little engine!
Fellow nerd that’s fascinated by unusual things here. I was hoping there’d be another video on this engine. Thanks for posting.
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.
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!)
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.
There must be some information on fuel recepies for those Webra 1,5 and 2,5cc diesel engines
This thing is super cool to me. Love the controls and the way it looks.
I am amazed that it can still attain sufficient compression!
Thank you for the videos!
RC fuel!
Absolutely brilliant. Love this. Well done.
What an odd, interesting machine. Great video!
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....
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!
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!
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 👍
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.
@@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 👍
The wheel diameter sounds like an interesting experiment. I'm not an engineer, but I don't think the ratio would change.
@@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 .
@@mickangio16 And you'd be correct.
Yeah, had to find the next episode of this little engine.
Really, really, neat.
Fascinating, thank you for sharing.
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 🌴🌴🌴🌄
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
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!
It's very satisfying to see the old girl get a second chance to strut her stuff. Good job!
Very different, thx for showing.
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.
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
ua-cam.com/video/RxW_yDvo04c/v-deo.html Mustie 1
Awesome dude, was hoping on this video 👍
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 👋🏻
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!
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
Wow! Such a fascinating little engine! Thank you for taking the time to share your experience with us. Hello from Detroit!
Very interesting.
Thank you 😎
That little bike is epic.
Interesting engine. Nice video.
Great stuff!!
It's a pretty unique toy.
Thank you for this vid
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
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.
This is awesome! Thank you for the video!
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
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 .
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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.
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.
That was interesting....no fuel out until you removed the cap, is the tank breather blocked? Just an idea....cheers Brian.
It was not the cap but the fuel valve... :)
Thanks for this video very informative and interesting .Andy Manchester England 👍👍
I would gladly own and maintain one of these, too bad they don’t have them in the states
That's fantastic.. You could try some Ether. Solvent Ether will work. Anaesthetic Ether is probably too hard to get now.
If it is working like a model airplane diesel, try one part each, kerosene, oil, and ether.
And if you really want to amp things up, a couple of percent of Amyl nitrate. An old bloke at my local model aero club gave me 100 millilitres in the 80s ( heart medication), for my competition freeflight diesel engines, for the nationals.
Great find mate.
I'll be following your progress.
Stu. Melbourne. Australia
I forgot to mention, try using castor oil with the one kero, one ether, and one oil mix.. . And the exhaust smells great..
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
It seems more like the rider is powering the engine rather than the engine powering the rider
You have a 'hill' in Denmark? I bet you can see the whole country from up there. There's always a hill, if there's a bicycle.
On good days I can see OUT of the country.... :P
We did the west side of Denmark on a bicycle. It is kinde exausting I can tel you. Greetings from the Netherlands, a real flat country.
Denmark?
Norway...?!
Denmark. @@route6295
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.
Fantastic
Whaaaaat?! This is so cool! Thank you for reviving and sharing such an interesting moped!❤
Well done...
🎉
Best regards from Germany
This thing is absolutely awesome!!!! Great nerdy bike!
thats an awesome bike it would be a dream to reproduce it all you need is a put put to get around
Appreciate it, I live for weird stuff like this😁
I love it. I'm really curious to see if it would run on vegetable oil. Imagine growing a small crop of rapeseed, harvesting it, extracting the oil and then running it on it. Would be so cool. I think it will be a pain to get started and possibly even too thick to run without a injector (I still dont understand how the fuel delivery on this works but I'll assume its some variation of a 'carb'.
To make starting easier and give some more power you can use a cetane improver (2ehn) which is a fuel addative. I used it on my mercedes that I ran on vegetable oil. Never had a cold starting issue even in the dead of winter.
Vegetable oil takes more heat to ignite. It doesn't' combust completely, and will eventually either bend the connecting rod or break the piston when the combustion chamber gets packed with carbon sludge. If he is having a difficult time with diesel, then vegetable oil is not even a consideration. In addition it will have even less power than kerosene. Kerosene has faster flame propagation than diesel making cetane a moot point. Unless you have screen door fuel filters vegetable oil will not work in actual winter conditions.
Brilliant
Great to see this amazing machine, thanks;
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
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
The internet itself doesn't but social media is.
ive been waiting this
Yea man I love two stroke engines
It's a 2 stroke compression ignition engine I have worked on much larger engines but still small thay used them in small horticultural machinery in the long distance past but I do envy you I have 10 ish mopeds but nothing as exotic as yours 👍
Thanks for the video. I would like more videos about the bike 😊
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.
Go back 100 years ago, the ford model t. You could run that engine on kerosene. You had to wrap a copper pipe around the exhaust manifold to preheat the fuel. Cold kerosene would not combust. The procedure was to start the car on gasoline then after the engine was warmed, switch to kerosene. I suspect diesel fuel might work the same way, needs to be pre-heated.
That's the coolest thing I've ever seen
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.
It was funny to see you riding on this „thing“. 😀
It WAS fun! :D and smelly
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.
What a great idea ! Thanks for a cool vid.🌞
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" :)