In my country (Hungary) there was a bike engine called Dongó from 1955-1957. It was almost like a Garelli Mosquito except it had a cast iron piston, a more modern throttle lever and a hungarian made carburetor. Because of this thing they call any bike engine in my country a Dongó.
You can re-weld piston and repair it in a lathe. I have done so many times . I also put a small amount of Kerosene and Gasoline in diesel fuel to help older motors start . Perhaps a lower gear ratio needed on hills may help. A danke Schoen
One thing to consider is that the lamp oil you used may not be the right fuel, if it's the stuff designed specifically for lamps, it's designed to be a clean-burning wicking oil which dosn't burn as well as paraffin (as us brits call it, kerosene elsewhere in the world, even called petroleum in some places to add to the confusion!!!), so that could be the main problem with it stalling, the go-juice just hasn't got enough go in it... :)
Here in the UK I found kerosene which is domestic heating oil which is similar to paraffin except it has a high sulphur content and less refined than paraffin. its way cheaper than the paraffin that you would use for lamps and heaters inside the house that has no sulphur and burns clean. UK kerosene would be a smelly bad idea used inside the house
@@legless1956 It's also a heavier fraction, so if used in lamps it's very smoky and unpleasant to use, and clogs wicks which makes lamps unreliable, Paraffin (Official dsignation BS2869 C1) is a lighter oil than heating oil (BS2869 C2) which is why it makes it better for lamps (and other purposes such as use in spark-engines), it used to be a dirt-cheap fuel, but as with many things, as its' use fell out of favour, it became less common, and prices went up when people did have demand for it...
I had airplane model engine which is basically same design in 1.5cc form. The most basic fuel for testing was equal parts kerosene ricin/castor oil and ether.
It looks like it needs two cables. Enviolo/nuvinci shifters have two cables and retain the position it gets set in. Not sure if that's any different. If it has one cable then a friction shifter with little ratchets might place nice.
Hi. Why do you use kerosene instead of diesel? Self-ignition temp is about the same, but more lubrication due to higher viscosity + cheaper. And I think the engine was designed to run on diesel. Greetings from 🇧🇪 Belgistan!
I think its too rich fuel mixture. I checked several videos of lohmann 18cc and compaed exhaustgasses. Your engine emitt toomuch unberned fuel. Needle adjastment or thicker fuel? Bio fuel, aka cooking oil, may help you. Anyway thank you for the video!
two stroke is begging for a tuned pipe... now that would be something! shame you dont show the cylinder and transfers but the flat top piston suggests schnuerle, so a pipe will work... anyway, this maynt exactly be ... what you want to do, but thinking.... you can get nice little 12v heaters now... diesel glowplugs... maybe (eek!) drill and tap a hole in the head and throw in a glowplug, then run it PWM as a "hot bulb"? could possibly get away with real diesel then. get it to burn properly and youre making power then! same time, me being me would throw a chamber around the exhaust pipe, and preheat the fuel as well... little BLDC mounted on the cank somehow for power...
You need a starter, for testing... Maybe use a treadmill, the exercise thing for running inside & going nowhere. Either with the belt or with the tire on the roller.
Thank you so much for your Lohmann series. It has facinated me for half a century, but all I knew was from books, so great so se it live and living. I have often wondered why nobody have persuated the idea(s) from this since. I find it quite brilliant...
niche market, and they never went well enough so shot themselves in the foot? why 18cc? lot of work to make one, were probably expensive for what they were, and too finnicky for anyone to tolerate... i love the tucked in design, hate the friction drive, love the diesel, hate the weird arse variable compression and throttle, love the concept... throw on a small generator, run something like a glowplug on PWM as a "hot bulb" system instead... can preheat heavy oil electrically, vaporise it, let exhaust heat take over as needed... i had lots of ideas before they got banned here... sigh... though, making a modernised "hot bulb" doesnt sound so stupid anyway... hmmmm....
Ja den store jeg har er 3285.... den er virkelig imponerende. det er muligt at købe på HmwTrading (.dk) med koden seasidegarage (alt med småt) Det giver noget rabat- skil støtter mig direkte.
Very nice, thank you. It would be cool to get the fuel mix so the variable compression had more operating range. I always learn something here, in such a relaxed way.
I am very impressed l never knew there was an assistant small diesel engine for a push bike wnd such an interesting motor its not like any covetional design of any two stoke four stroke and diesel engine which makes it ever so interesting
I can’t remember if you covered this already with the dripper. My thoughts are that traditional 4-stroke diesels control the ignition with injection timing. This way, they can almost completely eliminate preignition. How does that work for 2-strokes? So they draw in the air-fuel mixture similar to “normal” 2 strokes? Anyway, very interesting to see more fuel experimenting!
Yea its controled like normal 2 stoke and preignition is controlled by the compression... it gives the rider and owner a pretty important task to control!
@@SeasideGarageI see! Imagine if it had a mechanism alter the compression automatally for each cycle. Like increasing compression at just the right time to cause ignition when wanted! In theory I guess you could do this if had an incresibly fast hand and constantly turned the compression back and forth at just the right time!
@@MrToxicSkittlesounds like an arduino might be able to do that. Sounds funny but sometimes making it more complex makes it simpler. Not sure how you could measure how much compression is necessary but increasing compression with a stepper motor right at top dead center could work. Maybe even have it automatically advance/retard based on rpm.
@@ShinyUmbreon765 yes, exactly! In theory, if it had enough travel, you would be able to increase the displacement during the intake stroke and increase compression on the compression/exhaust stroke, meaning it would work almost like a supercharger/turbocharger. Or an opposed piston engine :)
@@ShinyUmbreon765 that stepper motor has to have enough power to overcome compression and combustion... yet act rapidly enough to do anything useful? kiss... standard glowplug with PWM and run it as a "hot bulb"... or is that too simple?
In my country (Hungary) there was a bike engine called Dongó from 1955-1957. It was almost like a Garelli Mosquito except it had a cast iron piston, a more modern throttle lever and a hungarian made carburetor. Because of this thing they call any bike engine in my country a Dongó.
You can re-weld piston and repair it in a lathe.
I have done so many times .
I also put a small amount of Kerosene and Gasoline in diesel fuel to help older motors start .
Perhaps a lower gear ratio needed on hills may help.
A danke Schoen
One thing to consider is that the lamp oil you used may not be the right fuel, if it's the stuff designed specifically for lamps, it's designed to be a clean-burning wicking oil which dosn't burn as well as paraffin (as us brits call it, kerosene elsewhere in the world, even called petroleum in some places to add to the confusion!!!), so that could be the main problem with it stalling, the go-juice just hasn't got enough go in it... :)
Here in the UK I found kerosene which is domestic heating oil which is similar to paraffin except it has a high sulphur content and less refined than paraffin.
its way cheaper than the paraffin that you would use for lamps and heaters inside the house that has no sulphur and burns clean.
UK kerosene would be a smelly bad idea used inside the house
@@legless1956 It's also a heavier fraction, so if used in lamps it's very smoky and unpleasant to use, and clogs wicks which makes lamps unreliable, Paraffin (Official dsignation BS2869 C1) is a lighter oil than heating oil (BS2869 C2) which is why it makes it better for lamps (and other purposes such as use in spark-engines), it used to be a dirt-cheap fuel, but as with many things, as its' use fell out of favour, it became less common, and prices went up when people did have demand for it...
I will try with kerosine and see.. :)
I had airplane model engine which is basically same design in 1.5cc form. The most basic fuel for testing was equal parts kerosene ricin/castor oil and ether.
More Lohmann video !😊
The largest reason I'm a patron, right here. ....While the rest of me waits for you to discover rally cars.... 😉
almost useless as an means of propulsion, still way more interesting than E-bike :D
Man that thing is over the top on the cool chart. I wonder if it’s possible to convert a weed eater engine to combust on compression
A custom one off piston for 100usd? Thats cheap since theres so much machining involved.
euroes... but I am not complaining! for the amount of work its cheap! but a lot for a 18cc piston! its tiiiiny!
I would love for a retirement project to make an engine from moped parts a reliable 50cc diesel, with glow and maybe even a fuel pump.
Maybee use a gearchanger from a mountainbike, then you will have some fixed points, in the differentiere compression areas. Just an idea 🙂
It looks like it needs two cables. Enviolo/nuvinci shifters have two cables and retain the position it gets set in. Not sure if that's any different.
If it has one cable then a friction shifter with little ratchets might place nice.
What a great little bike - you certainly love your quirky modes of transport!
I suspect that vegetable oil would work quite well for this. Good lubricating properties and a relatively high flash point.
It’s strange how my memory as young teenager makes me believe that mopeds were always reliable, clearly ‘false memory syndrome ‘ good luck
Yea... not a lohmann... :P
Hi. Why do you use kerosene instead of diesel? Self-ignition temp is about the same, but more lubrication due to higher viscosity + cheaper. And I think the engine was designed to run on diesel. Greetings from 🇧🇪 Belgistan!
Many diesels seem to start and run better on kerosene.
We use in winter on old machines here in America.
Im told the diesel will wreck the internal parts of the engine.. (when left standing)... but will try diesel also, and flush it afterwards... :)
I think its too rich fuel mixture. I checked several videos of lohmann 18cc and compaed exhaustgasses. Your engine emitt toomuch unberned fuel. Needle adjastment or thicker fuel? Bio fuel, aka cooking oil, may help you.
Anyway thank you for the video!
two stroke is begging for a tuned pipe... now that would be something!
shame you dont show the cylinder and transfers but the flat top piston suggests schnuerle, so a pipe will work...
anyway, this maynt exactly be ... what you want to do, but thinking....
you can get nice little 12v heaters now... diesel glowplugs...
maybe (eek!) drill and tap a hole in the head and throw in a glowplug, then run it PWM as a "hot bulb"? could possibly get away with real diesel then. get it to burn properly and youre making power then!
same time, me being me would throw a chamber around the exhaust pipe, and preheat the fuel as well...
little BLDC mounted on the cank somehow for power...
HI I find that little engine so simple in its own way yet so complicated in its own way hope you do sum more work on it. ps nice vice grips???.
It might be the camera angle but it looks like your handlebars aren't straight (relative to the front wheel )
You need a starter, for testing...
Maybe use a treadmill, the exercise thing for running inside & going nowhere. Either with the belt or with the tire on the roller.
Is the transmissionen of power to the wheel kind of like a Velo Solex?
yes
Velosolex had abrasive grit while this has little spline that dig into the tire. Same idea though!
How much power does it actually produce when properly tuned and how much fuel does it consume? How effective is it?
0.8hp... should give 100km/l
Such odd little engine
Thank you so much for your Lohmann series. It has facinated me for half a century, but all I knew was from books, so great so se it live and living. I have often wondered why nobody have persuated the idea(s) from this since. I find it quite brilliant...
niche market, and they never went well enough so shot themselves in the foot? why 18cc? lot of work to make one, were probably expensive for what they were, and too finnicky for anyone to tolerate...
i love the tucked in design, hate the friction drive, love the diesel, hate the weird arse variable compression and throttle, love the concept...
throw on a small generator, run something like a glowplug on PWM as a "hot bulb" system instead... can preheat heavy oil electrically, vaporise it, let exhaust heat take over as needed...
i had lots of ideas before they got banned here... sigh...
though, making a modernised "hot bulb" doesnt sound so stupid anyway... hmmmm....
Hvilken Skil slagnøgle bruge du? 3285? Har du nogle link/koder hvor vi støtter dig når man køber Skil?
Ja den store jeg har er 3285.... den er virkelig imponerende.
det er muligt at købe på HmwTrading (.dk) med koden seasidegarage (alt med småt) Det giver noget rabat- skil støtter mig direkte.
Its ALIVE !!!!
Ælsker det du laver mand : D Jeg har også en veteranknallert, en Skylon 56 bygget i Randers og Aarhus i 50erne. Hvad for nogle har du af knallerter?
Tak! :) jeg har mange! 13 tror jeg for tiden... ;)
I would rather have this one than an electrical bike :P I can imagine you would be popular if you took a ride in Copenhagen :P
Add some ether directly to the fuel will improve starting and combustion. It's just like a diesel model airplane engine!
Very nice, thank you. It would be cool to get the fuel mix so the variable compression had more operating range. I always learn something here, in such a relaxed way.
Äntligen Lohmann igen. Intressant liten motor
Se där. En bekant i kommentarerna. Hoppas det är bra Per.
@@kristianmandell5194 vad kul att du också följer.
What a fabulous machine. Many thanks for the series, would be interested in any of the other mopeds you have.
I am very impressed l never knew there was an assistant small diesel engine for a push bike wnd such an interesting motor its not like any covetional design of any two stoke four stroke and diesel engine which makes it ever so interesting
You have some very interesting toys Seppo 😁, is cool 😎👌🏻
What an incredible machine! Fascinating!
Love this stuff, thank you 😊
✌️💚 🇬🇧
Mayby you could make a smaller run a-long wheel for it to gear it down? Seems like it lacks torque to rev higher.
Decreasing the wheel size decreases the gear reduction in the same proportion because the wheel is being used as a big gear by the little roller.
since you're having trouble with the higher compression settings, maybe try leaving out the cetane booster from the fuel
Pretty sure the cetane booster makes higher compression possible :)
This was so cool. What a nice little engine
Epic little engine.
Fantastic!
I can’t remember if you covered this already with the dripper. My thoughts are that traditional 4-stroke diesels control the ignition with injection timing. This way, they can almost completely eliminate preignition. How does that work for 2-strokes? So they draw in the air-fuel mixture similar to “normal” 2 strokes?
Anyway, very interesting to see more fuel experimenting!
Yea its controled like normal 2 stoke and preignition is controlled by the compression... it gives the rider and owner a pretty important task to control!
@@SeasideGarageI see! Imagine if it had a mechanism alter the compression automatally for each cycle. Like increasing compression at just the right time to cause ignition when wanted! In theory I guess you could do this if had an incresibly fast hand and constantly turned the compression back and forth at just the right time!
@@MrToxicSkittlesounds like an arduino might be able to do that. Sounds funny but sometimes making it more complex makes it simpler. Not sure how you could measure how much compression is necessary but increasing compression with a stepper motor right at top dead center could work. Maybe even have it automatically advance/retard based on rpm.
@@ShinyUmbreon765 yes, exactly! In theory, if it had enough travel, you would be able to increase the displacement during the intake stroke and increase compression on the compression/exhaust stroke, meaning it would work almost like a supercharger/turbocharger. Or an opposed piston engine :)
@@ShinyUmbreon765 that stepper motor has to have enough power to overcome compression and combustion... yet act rapidly enough to do anything useful?
kiss...
standard glowplug with PWM and run it as a "hot bulb"...
or is that too simple?
Nixe
It seems noisy?
Its got the nickname "Nervesaw" in Germany... :)