Opposed piston 2 stroke diesel engine animation (Junkers Jumo 205 concept)
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- Опубликовано: 21 авг 2024
- Opposed piston two stroke diesel engine (inspired by the Junkers Jumo 205D)
The engine has 6 cylinders, 12 pistons and 2 crankshafts
Edited version of the engine available at: • Opposed piston diesel ...
Kinematics at 4:40
Also check my GrabCAD account: grabcad.com/al...
More pictures of the engine available here: grabcad.com/li...
Disclaimer: This model does not show a complete and validated technical solution. 3D model was created for an university project, no prototypes or testing were done.
![[TF2] The Russian Bear Trap](http://i.ytimg.com/vi/YFNSwz2_rOA/mqdefault.jpg)
I see some obvious differences to the jumo 205:
1:41 This motor has monolithic aluminium pistons. The 205 has composite pistons with a bottom of steel because the exhaust gas gets extremly hot.
1:41 This motor has crankshafts with counterweights. The crankshafts of the 205 has no counterweights. Counterweights are not necessairy at an in-line engine with 6 cylinders because all forces are balanced. ;)
2:23 This motor has 1 injector per cylinder, the 205 has 4.
4:53 At this motor inlet and exhaust pistons reach the top dead centre at the same time. At the 205 the exhaust pistons reach it 13 degrees earlier than the inlet pistons to open exhaust first.
But it's a nice Catia animation. :)
I designed this same engine about ten years ago and began to build a plastic prototype, but got sidetracked into other projects. I am glad and sad at the same time I was not the first. Glad, because I am seeing the history of it now. Glad also it was used successfully. Mine had elliptical valves circumferential to the cylinder. Don't know if that would work. These pistons reach TDC in half the time as normal engines, but BDC in half as well, so no advantage in power, but because mine was headless, it could withstand much higher compression ratios. Remarkable how dead on similar our designs are!
The Junkers Juno 205 was used in the Ju-86 airliner & high altitude recon bomber during WW2. At the time it could fly far higher than conventional RAF fighters.
This concept was used to make the Commer 6 , using a Roots blower. Worked well but was dropped by Chrysler. The exhaust when accelerating was unbelievable
Almost. The Rootes TS3 had its six pistons working on one crankshaft, so it was a bit more compact than a Jumo with two crankshafts.
Seam to remember the TS3 was more like the Sulzer engine using single crank with rockers
I noticed in the animation that the pistons are in sync with each other. For some years I rode a Puch 250 split single (twingle, look it up). The idea of it was to get an asymmetrical port timing, exhaust opens before the transfer port and closes before the transfer port as well. This gave better scavenging and excellent fuel efficiency. By slipping the transfer crank back a bit, it could theoretically work here, as well as on a Deltic design. This design I think was thought of with the intention of putting it into a wing, low profile = low drag. I don't know if it was ever utilised as such.
yes I also see the problem of the symmetrical exhaust and transfert and I was looking for a solution but on this way you have less compression rate so less volume and the forces are not equal on both sides and it's vibrates isn't it ?
@H K Maintenance? What maintenance? Clean the spark plugs (there were 2 of them in the same head) It used 20W40 in the 2 stroke oil, gearbox and in the shock absorbers front and back. Rear chain as well!!
@@loicpavy7744 Er, I wouldn't call it smooth, especially if you tried to rev it. 100KPH and over, you lost feeling in your hands and feet after a while, very long stroke motor. Compression if I remember was 6.7 :1, it would run on paraffin, nicked some from my dad when I had no money for petrol.
Forces on both sides will be equal as both pistons have the same bore diameter and common combustion chamber.
its good to see people re-discover the wheel. brilliant, carry on,
I agree. Fairbanks Morse has made this similar design for a hundred years. Offset crank timing though. Good job with software!
One problem is, is that it losses half it's power on the power stoke because the compression would be out at half stroke because it would have such a large combustion chamber but in the single crank the piston gets it full down stroke but with this it would lose its compression halfway down because it would be the same distance of a single crank on its down stroke. So a way to resolve that is have a grater volume of air going in or chop the stroke in half.
It is the better air flow through the cylinder (read:more efficiency) but it also makes the engine thinner. The air is indeed blown by a supercharger.
There were several other opposed piston engines. The Junkers was developed by Napier into the Deltic as used in the Class 55 loco and in minesweepers. The US Fairbanks Morse as in submarines and first generation locos was another, as was the TS3 a 3 cylinder engine developed by the Rootes Group in the 1960 for truck and bus applications. There is also the massive Doxford marine engine. A key feature is a slight out of phase of the pistons to effect a scavenge of exhaust.
Nice vid showing the opposed design of the Jumo 205
The Germans used this diesel engine in airplanes during WW2, so it was a successful idea. Later the British developed the idea into the 3 crankshaft Napier Deltic engine for use in torpedo boats, and later passenger trains.
Recently the opposed piston concept is being developed by Pinnacle engines for use in vehicles, though it is a 4 stroke sleeve valve design, not a piston ported 2 stroke like this.
Germans used it in hidroplanes.
@@Bacanalable BV222 Flying Boat, 6 of them. In theory you could top up Diesel from a submarine. The successor BV238 (biggest plane of ww2, wingspan like Boring 747) had 6*DB603 petrol engines for more HP
Back in the '50's whilst in the RAF I picked up a lift in a Commer two stroke diesel tipper lorry.The driver was an avid fan of his lorry and regailed me with the the history of the engine. He told me the engine came from a German fighter found by a dutch farmer who having failed to harness it, sold it to Commers who developed it for their trucks.
Incorrect - Commer 2-stroke originated the "KNOCKER". It had only one crank and an unusual piston rod design. Commer powered most of the lorries in the UK starting after WW2 and they were very reliable and lasted forever.
This engine was designed by a man in Whanganui New Zealand in 1929.
He took it to Ford and General Motors but they weren't interested so when the patent
Lapsed the Germans copied it and it ended up powering a lot of their WW2 aircraft.
No, the development of the jumo 205 started in germany in 1916. ~:)
HI Alex. Yes you did a good job. As you stated getting practice with 3D solid modelling. I did that myself. I built a whole range of useless engine designs. All you need for practice is build the positive displacement supercharger that is necessary to make this type of engine work.
As you may know already but for those who don't the engine has no way of scavenging the exhaust gasses (only ports to release the cylinder pressure) and reloading new air for compression and fuel injection.. Building that will be fun.
Hi Roger, thanks you for message. There is also an updated version of the video, where you can also see the supercharger unit.
ruclips.net/video/9Lw6ehzMEOI/видео.html
The engine in the truck was 3 cyl, 6 pistons, two cranks and supercharged. He said it had the power of a six, the smoothness of a twelve and the fuel consumption of a three cyl and no wasted energy against a stationary head..
Something here is not right.. Since it is a 2 stroke and u use a 4-stroke crank, 2 cylinders will fire simultaneously.. I suggest u twist half of the crank 60* in relation to the other half.
Interesting...I never thought about the rather obvious need for only a 6 port diesel injection pump in this configuration rather than a 12 port.
Lo más hermoso es la sencillez😊
Waouh c'est vraiment génial, c'est du génie, création vraiment
solid works is such an amazing program
Except you know... this is not solidworks.
Try the Napier Deltic engine for your next animation. 18 cylinders, 36 pistons and three crankshafts.
I wish somebody would make a see through model of this amazing kenetic sculpture that produced around 3,000 Hp.
Наши слизали и получился "Двигатель 5 ТДФ"... Спасибо Немецкому гению!
I've done some work with Catia V5, and this could had not been easy to animate...
How would piston rings get oil on them? Unless maybe if you use an oil spraying technique. Cool design man! Definitely put in some seriously good work. Im studying automotive and engineering so this interested me a lot !!
oil is in gas
I don't mean to be ignorant but can I know what type of software that is? I have been designing an engine for a few years on Microsoft paint and the only way I found to animate it was through powerpoint.
looks like an old commer two stroke lorry engine from 60 s (rootes group UK)
jimuraypearson With the simple difference that this has been developed and build in the 1930s.
That engine had just one crankshaft and system of rods for the opposing Pistons to function , great distinctive sound to the engine though.
This concept, with some type of computer actuated. One way valve system for both fuel, air intake and exhaust, using the same manifold. " thats the simple way of explaining it" I think this engine adapted to gasoline. And super or turbocharged. The potential H.P. and torque would be phenomenal. I would like to exchange a few ideas, with the designer, of this engine.
What is the advantage of a piston acting against another piston, rather than acting against a cylinder head? To me, it seems that the disadvantage is the added complexity of another crankshaft with its associated lubrication and moving parts.
For a 2-stroke, it's a clean design for sweeping the old gasses out of the chamber, but what propels the gasses? Is it a blown transfer? How do you prevent unburned gasses from going straight through the chamber and out of the exhaust port?
The reason for this engine: The Germans needed an engine for their maritime reconnaissance planes. These planes need to fly slowly for long periods, so fuel efficiency is a requirement. Diesels are 30% more efficient than gasoline engines. But also, the full expansion of the burning charge creates better efficiency. Single crankshaft engines cannot allow the piston to move enough, so the charge BLOWS out the exhaust with WAY too much energy.
Very nice!
basically commer knocker ts3?
Commer as opposed piston but one crankshaft with rocker arms. Also only 3 cylinders.
look forward to your responce
You could try to make an a shape and cut the piston heads diagonally to prevent oil from building up on one side
No Sound? Except for about 30 seconds?
Can Opposed Piston setup work with a CV Motion Crank instead of a normal Crankshaft? How about a Coaxial Crank setup? It might make it more Efficient right?
Veri good
Sorry Alex,
I was correcting myself on the Commer engine observations. Did you read them?
The oil is inject trough the crack shaft to the bear rings? Cuz that will be much better then dump it in to the oil.
yes, this is correct.
Perfect animation!!
ONE CHAMBER, TWO PISTONS GO IDEAS. SAVE BUT USE NOBEL GAS ONLY.
Why not call this engine by it's name : The JUMO 205 = it's first issue . 3 cylinders / six pistons , two strokes diesel with a turbo booster on feeding , almost a continuous flow engine .. This fantastic engine , later named JUMO 207 ,propeled , the Ju 86 in the stratosphèra up to 15000 m as soon as 1931 . This formula was a significant enhancing for performance engines !
Not turbocharged - supercharged!
German transports using this were able to fly from Europe to South America on a tank of diesel, in the 1930s...
@@stephenkeebler732 Danke zehr for this information . This seems a top performance for a Twin engine ! Could you tell me more details on this performing flight ? ( I think it was the Junker 86 ?)
shouldnt the 2 crankshafts be connected by gears for maximum horsepower?
Take a look here on youtube at "Chieftain Tank Engine" ..... to see and hear a real example of this type of Engine Running...... British Leyland were one company that used to make them in the UK ( I Think).... they are regularly on display at Steam Rally's in the UK.
However...
-If you build an engine with opposed pistons, your charge WILL reach full expansion, and very little pressure will be lost. They even used a turbocharger to recover what little heat energy they could.
These days we don't need opposed pistons to achieve full expansion of the charge. We can do that with turbochargers. Most turbocharged cars get 1 mpg better than their NA relatives.
are the piston sleeves cast into the block or are they replaceable?
can you include a slice of the block i would like to see the coolant channels, please?
with the one sided nature of combustion wouldn't two opposing injectors even out the explosion pattern?
The piston sleeves are separate parts, press fitted to the engine block.
Basically the engine block is like a box around the cylinder sleeves, the space between them is composing the cooling circuit.
You might be right with the 2 opposing injectors system... but this model was made by me just to practise my CATIA V5 design skills, I am aware that the technical concept might not really be 100% correct.
Cummins is developing one of these I believe
Achates power developed most of the technology (its basically this engine + modern ideas to fix issues with it such as oil consumption, noise, and further increase efficiency and clean burning with electronically controled air charge and injection). the other think achates has done is reduce the number of cylinders (this means bigger more efficient cylinders/pistons with less friction losses).
Pistons is wrong: this 4stroke design pistons.
Yes you are right. It used to be like that but i have corrected it, if u see in this clip i have the correct pistons.
Opposed piston diesel engine animation
thats because it has a pressure oil system
Now only fuel a few of the cyl. & route exhaust to other cyl.
thanks man :)
What keeps the oil from getting into the exhaust ports when they are uncovered from the crank side?
Nothing…it’s a 2 stroke.
Nice... You've missed the exaustvalves...
CAM Geurs no valves, no head, this is an oppressed piston engine.
The ports on one side are intake the ports on the other are exhaust... there are no valves other than the ports themselves.
Sorry, wrong! only one crank. Each bank of cylinders drove via a rocker to the crank.
That's the commer knocker and frankly its an unreliable design compared to 2 cranks + gears which is a bulletproof reliable design which also reduces the number of parts you need to design and manufacture.
Are there any of these engines running today? The aviation museum in Brussels at Parc Cenquentenaire has a cut-open Jumo 205 on display.
It would have to sound exactly like a heavy truck, an 18- wheeler, with their 14 liter inline six engines. That is basically what this is, a large inline 6 diesel. The Germans created this massively heavy engine and mounted it on an airplane [something that needs to be lightweight] for maritime reconnaissance.
a v4 twin ( one small and one big ) turbo two stroke
Interesting, I would like to see how balanced it is and how it handles diesel ignition
nice job ,
what is the software used in the making of this RUclips ?
This was even put in aircraft LOL
Andrew Smart WA
ill pay u to desighn the engine in my head :D
i also
i approve
Commers in UK had a 3 cylinder 6 piston opposed piston engine in the 1950s which was discontinued ! How is your engine better than this?
+Sandy Mackie Yes they were made by Commer, the TS3, very economical to run but were discontinued as they were very loud and needed decoking on occasion; sounding like a race car engine when you revved them up.
Incredibly the purpose was to use the design tools, as stated. The design doesn't have to be better but go on quoting what has been done and comparing it with what is being done... Well done
did u used c.a.d to design this engine ?anyways nice work :(
get it in
ther was many diesel motors whit this configuration Le moteur MAP the tractor MAP was a only crankshaft and a rokers system conected whit conecting rod the piston and the central crankshaft The rootes blower do the charge and sacavenge
It would sound a lot better with expansion chambers..
Kolev Motors Video
ruclips.net/video/M0hysidSNlY/видео.html
Kolev Motors Animation2
ruclips.net/video/2DrRVm478Tw/видео.html
Siperb
still being used in soviet tanks 😅
Ta-152 engine?
Ta 152 had (afik) a Jumo 213, which was an inverted V-12 4-stroke petrol engine.
I got so fuckin bored that I turned the vid off at 4.40 !
what is the point of this engine?
I'm watching the achades version of this on autoline.
it is not a design of his, these engines have existed for a long time. This is a CAD project.
thats not opposed
Do you have this motor in Inventor ?
Do you have any document for created this motor in Inventor ?
+alex dd9 I have to create any mechanism to practical maturity and I going to choose any airplane with this motor or Roll Royce Kestrel motor. Dimensions I can adapt to airplane. This is the most used motor in 2nd World War
sorry,can you tell me you use what software??
Autodesk Inventor 2017
thanks
Hey Cummins has allready put out for military use an opposed piston engine. And they have been doing it for years
Find a better motor anywhere....not...
similar to an L60 Diesel engine used in a British Army Chieftain Tank.....you should hear them scream.600 Hp and not the most reliable engine either.
no suficient animation!!!!....
But today's turbochargers benefit from extremely advanced metallurgy. The Germans in WWII had TERRIBLE metals technology, that is why they LOST the second world war. That is also why the Soviet Union does not exist any more.
What a stupid idea, 2 heavy crankshafts
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