Agreed, it’s definitely a 2 stroke engine. The opposed piston design is great for getting high efficiency. However, the swashplate driven by rollers via piston rods won’t yield much torque due to the extremely low effective driven lever angle, low torque results in low efficiency. Furthermore, as a result of the low effective lever angle, there will be extremely high friction load on the roller and swashplate and likely to result in relatively limited life of both, but more likely the roller. Didn’t show it running as I think torque provided will be very low especially at low speeds. Personally, I’d do away with the inefficient swashplate design.

The "One Stroke" aspect is pure marketing. This is an opposed piston cam engine. The arrangement is interesting and unusual, but not revolutionary. The thing is opposed piston engines are typically pressure charged to assure good scavenging. That leads me to believe that the blower on their example Miata isn't just there to make more power, but is a vital piece of the package. Good video explanation of an interesting mill.

It is impossible to have a single (or "one") stroke piston driven engine as the "stroke" refers to the direction the piston travels. This is a two stroke piston driven engine as the piston travels "down" (one direction/one stroke) on the power/exhaust stroke, and then returns "up" (one direction/one stroke) on the intake/compression stroke. The turbine and rotary (Wankle) engines could possably be considered a single stroke engine because their propulsion mechanisums travel in a circle (one direction). But they are based on a diffrent consept.

The wavy component is actually called a swash plate in the hydraulic pump world. Interesting design.

Thanks for the video! I am curious about long-term reliability/performance tests.

There are 1-stroke internal combustion engines - they are called jet turbines.

The biggest weakness of two-stroke engines is its oil burning property, which renders them unacceptable in terms of pollution reduction efforts.

It is an axial swash plate opposed piston uniflow two stroke. All of this has been done. I seriously doubt it can be built to match the emissions and durability of a conventional four stroke piston engine regardless of how much development is invested in it.

Back in the 90's Orbital came up with a "modern" version of a 2 stroke engine. All OEM companies signed up w/ Orbital to do feasibility studies with production potential, however nothing came of it. The piston port remains a major issue in terms of durability and emissions. All 2 stroke engines require that the piston ring is restricted from rotating, and surely there is a steel pin in the ring groove that prevents the ring from rotating. If the ring rotated, the gap end of the ring would get hanged on the piston port edge, inlet or exhaust. So, when you prevent the ring from rotating, the same fragment of ring circumference endures excessive wear near the exhaust port and shortly begins to loose it's sealing effectiveness, which affects emissions down the road. Did they solve this hurdle in this case?

As a direct engine replacement for the typical engine-transmission arrangement, maybe for subcompact cars (smart car, mini cooper weight class) or motorcycles, yes. For larger vehicles (civic and larger) no. However, this would likely be a very good design for a hybrid where all it is doing is turning a generator to feed power to an electric drive motor and battery pack. Also this would be a great small package for your typical back up generator where a steady rpm is held for long periods of time.

exhaust piston runs hot all the time? how are the mmissions from it?

I would call that a cam plate, instead of a wavy component.

Those rollers will wear out really fast. There is a huge pressure and friction on those pieces with the surface.

Interesting design. Regarding torque output, does it need to be poor at low revs? I use to own a 1000cc V-Twin and the torque output from that was pretty insane from just 2 cylinders. I suppose it all comes down to design. But you are right, engine design seems to have got stuck in a loop. This would be pretty cool to see on a production vehicle.

I see two issues: 1. Much like worm gears, swash plates are good at driving, but not so good at being driven. The torque discussion in this video is spot-on. 2. It seems to me that the lateral force the swash (wavy) plates exert on the piston rollers would be extreme and difficult to counter by using the cylinders alone as effective journal bearings. I'd be interested to see longevity test results with the engine under load. And, if I may, I'm not sure I understand the logic (as explained) behind how intake/exhaust is coordinated. I don't see how exhaust gases (which are undoubtedly at higher than atmospheric pressure) could possibly leave any sort of vacuum behind when exiting the combustion chamber. And from the animations, it appears that the exhaust port and intake port are opened and closed at the same time, which would allow exhaust gases to exit out the intake port since, again, exhaust gases are undoubtedly at higher than atmospheric pressure. If the animations are to be trusted, then I suspect the purpose of the supercharger is not to increase the power output, but simply to overcome the pressure of the exhaust gases and ensure that they go out the exhaust port as they should. Indeed (again, if the animation is to be trusted), with the exhaust port and intake port opening and closing at the same time, there is no way a supercharger can possibly increase power output since the open exhaust port will prevent the supercharger from compressing the gas before combustion takes place. It would be like trying to pump up a tire that has a big hole in the sidewall. Therefore, I suspect the purpose of the supercharger is solely to overcome exhaust gas pressure in order to ensure that the exhaust gases flow out the exhaust port, and not out the intake port. If this is the case, then the supercharger is actually not doing that much work and need not be all that "super" in its ability to compress air, which is not at all a bad thing. Other than that. I think this design has potential. But I like the Koenigsegg engine better for its clever design that doesn't require conversion of linear force to torque.

I can remember from the 60s Roots Group (hence the Roots supercharger) had an opposed piston two-stroke supercharged diesel engine, which was widely used. It had two crankshafts for the two blanks of opposed pistons. Overall not a very efficient engine I understand but it was mass produced. For many years

this is a marvelous invention now at a single combustion twice the power very very smart, fuel efficient, space efficient, and material efficient to produce also its easier to maintenance since its too small.

A turbo system and use a UTV buggy would be a great project.

A smaller, higher rev model would be great to power a generator for a hybrid.

A true "one-stroke" engine would be a gas turbine engine. Where intake, compression, combustion, and exhuast are all occuring at the same time, at all times. Thus, we are left with just one process or "stroke" I dont think a 1 stroke piston engine could exist, its operation is contradictory to any less than 2 strokes, as no matter what the piston will always need to oscillate between up and down, strokes 1 and 2.

Swash plate is as old as the hills and a one stroke engine has a double acting piston. A steam engine of the double acting type is a one stroke engine. An engine with the cross head to conrod set-up with a blower for scavenging both ends might work as like it did for the two stroke diesels that had a wet sump. Every tdc is a hit and every bdc exhaust leaves the top and more fresh charge on the side. That engine has powered torpedos since at least ww2. Some used compressed air and others actually had an air tank so it could burn fuel. It's a cool engine but not a one stroke and certainly not new, the pioneers from a hundred years ago behind this thing are long gone.

Immediately saw this was a two-stroke engine. But still very interesting and hopeful that it will have real world potential.

Could you try square cylinders so that you can make valves on the cylinder Walls for four strokes?

The engine was designed as a 'range extender' to power a generator at a fixed RPM so torque isn't an issue. They have a Mazda Miyata running for more than a year and I've seen it go up and down hills so it must have some torque.

Use as a range extender would eliminate range anxiety for me so let's see it used that way. Maybe the 1 stroke terminology is derived from the fact that you have 2 strokes, 2 pistons in 1 cylinder which equals 1.

Reminds me of a yoke swash plate mechanism in aircraft oil pumps

I googled Mazda MX5 2023. No mention of a new engine. They said the engine is 2,000cc and not 500cc. I am confused. Any explanation?

Looks very good engine, hope they can make hybrid with this.

This reminds me of the lack of reliability of the 1.0 Ecoboost-engine.

Great channel and content , as a former GM Duramax engineer this is awesome. .Great engineered Diesels are going to rule .We can fix the emission problems.. Subbed and shared..

how is the piston pulled back on the intake stroke if its a roller ?

This fits into the cam type of barrel engine. Barrel engine designs have been around almost as long as conventional IC engines. Most proposals have been for aero engines. One attraction is smaller cross section. None of them ever went into production. Their one main enemy has always been heat. Now could this work as a range extender. Yes it likely could. But so could a small fixed speed gas turbine.

Pretty similar to the William Hopkins patent from the late 50s. His also drove a wavy disc and had cylinder ports instead of valves. The difference is that the piston rotated in the cylinder as it moved up and down. He was around 19 or 20 when he patented his engine, and I was 11 at the time. We met while camping in South Dakota and corresponded for several years. His patent number is 2,962,008 (11/29/1960)

4:17 this frame seems to show some of the oil passages and bearing surfaces. Note the rollers look pressure feed as do the lower piston to cylinder wall areas. These are critical tribological features to get right or there is no hope for long life & good power density.

The frames go by so fast I missed this. 1:49 Articulating piston should help upper piston from scuffing and wear from side loading the cam is putting on it to force turning.

This engine seems like it could be a great candidate for a twin charger setup with a Roots or Screw charger handling the off idle / low rpm torque issue that I'm sure the engine suffers from due to the really short effective stroke, then a Turbo taking over in the higher RPM range. Granted, it would obviously add more weight but I bet it could have a really nice torque curve and be in the 300+ hp range without much issue and would still probably be an overall lighter package than any aluminum block Inline 4. By doing a twin charger setup with a Roots or Screw style (i.e., positive displacement pump) Supercharger handling the Low RPM side of operation, you could get rid of the variable compression mechanism which eliminates a wearing item / additional failure point and possible reduce a little bit of weight in the process.

This is a opposed piston 2 stroke engine, those have been around for more then half a century in large diesel engines...

Wavey component, is there a technical name for it, P/N wavey component 1.

Beautiful and innovative!

Apart from the swash plate this look pretty similar in operation to the "Tilling Stevens 3" 2 stroke diesel of the 50s and 60s as used in Commer lorries. That engine had 6 opposed pistons operating a single crankshaft through rockers. Different yes but the principles of combustion look the same. And what about the Daddy of them all? The 18 cylinder "Deltic" engine.

Could this be used as a small aircraft engine because of it's power to weight ratio ? Just asking.

Wobble plate engine similar to A/C compressor that were take out of operation in the 90s. Using Reid valves intake and exhaust GM manufacturer the plates would sometimes get out of sink and lock down

Napier used opposed piston engines in the 1950's diesels, they were awesome in the deltic trains etc. not lightweight like his though and they were a devil to diagnose if they had a running problem apparently.

From a mechanical point of view the part that I see being trouble is the roller at the end of the piston. The "wavy plate" is spinning in a circle, so the exterior is moving faster than the interior part. That would put a lot of stress on the bearing in the roller. It seems like that part would be quite troublesome a lot more often than you might think due to the different stresses applied on the interior and exterior of the roller.

Interesting vid! Even if it is a little weak in the Miata, remember it is only .5L. Why limit the displacement to such a small size if low end torque is a concern?

I have a question, the piston rollers moving the wheels will wear out and the surface of the wheels

I think the correct name for the "shared shaft" that connects the Wavy Components is actually "jaggy metal turny-stick".

The direct fuel injection rather than fuel injection before the intake valve is going to make this engine not last long at all. The carbon buildup is going to be ridiculous.

Concisely delivered evaluation, interesting and informative. I had at one time designed an automobile-targeted jet engine which General Electric found interesting, which sat vertical, and was short and squat. Later, I did an 8 piston internal combustion design quite analegeous to the one you show, also short and squat, vertically oriented. It had only two moving parts in the power train, and four rotating valve mechanisms driven by a single gear. The design required hardly anything akin to an engine block as we think of them. Not a serious commercial effort; no one is going to bust the market wide open with radical designs very easily, as you point out.

Correction, it has as mass of 35 kg and a weight of 343 Newtons. Mass and weight are not the same thing. That 35kg engine still has 35kg of mass floating around weightless in space. Weight is the product of mass mutiplied by the acceleration of gravity and has the fundamental units of kilgram meter per second squared = a Newton.

I like the wave plate and opposed piston design. Thats pretty cool.

I was. Hoping to. HEAR. it. Run. !!!

Awesome!

Looks like it would have high rocking thrust load on the piston mainly on the power stroke.

I see swash plates. This kind of makes it a Stirling engine variant. Kind of a cross between a two-stroke and a Stirling.

This is an interesting concept engine that has potential. The thing that bothers me is that in the video, there was clearly a supercharger attached but no visible drive belt actually driving it. The 2 stroke diesel that's still being used today uses a gear driven blower for operation. 2 stroke engines operate on a pressure differential for the intake and expulsion of exhaust gases. We don't know enough about this engine to know exactly how this works. If this engine does in fact have a functional supercharger attached, then where was the belt drive? I like the engine design myself, but I think the designer is trying to over-sell it. 120hp on a opposed piston naturally aspirated engine displacing 500cc is a bit hard to believe without a power adder of some kind. I could be wrong but my years of engineering tells me that something is off with this.

In short a two-stroke opposed piston uni-flow barrel (or drum) type engine using what is effectively a swash plate connecting system. Note uni-flow engines require forced induction to work well so turbo or super charging is needed. Only interesting part was varying the relative positions of the swash plates to vary the compression ratio which may have benefits in running different types of fuel as well as running higher boost pressures at high rpm. Still doesn't address the issues of high wear and friction that piston ported and swash plate engines have though. Good video 👍

It will burn oil if its intake ports are on the side where the oil for the piston ring is. Thats why the rotary engine burns oil too.

Sweet critique and technology comparison!!!! Thank you for this!!! (I initially clicked thinking it was going to be about a linear sterling cycle engine. This is even more interesting!!! 🫶🏾🫶🏾🫶🏾🫶🏾

I'm stumped as to how the engine gets lubricated. Does it use two stroke oil in the fuel & how does that lubricate the wave cams as it is injected straight into the cylinder. It can't have oil in the wave ends or it would expel it out the ports .

Reciprocating steam engines are 1 stroke.. Most steam locomotives are 1 stroke.

Developing an ICE engine at this point is futile. There will never be enough demand to warrant it.

Which positive displacement compressor have you fitted to your rotary engine? How was it applied? Thank you very much.

Even a normal 2-stroke is forced induction using the primary compression in the crankcase. This thing (without forced induction) would run as good as a 2-stroke with a blowen base gasket (virtually not at all).

In the last 50 years there were about 20 different sorts of such engines, but no one of them was able to finde way in mass production. P.S.: Even when this engine runs great, it is 100 years too late.

Guess this is more of a 2-stroke oposite pistons engine... Another of those videos

Same mechanical principle as some of the not so old Bosch Diesel Fuel injection pump, Fuel injection applied to so e two stroke outboards from the Australian patent in the 90s. Some efficiency increases perhaps but not necessarily earth shattering.

Here you did not mention that pistons direct torque frictions against piston walls, vs conventional engine with connection rods.

It wasn’t specifically pointed out in the video, but there is a brief image of a coin balanced on top of, what I presume is, a running engine. Very impressive. While the application volume would be low, it intriguingly seems that the characteristics of this engine would make it highly suitable for powering power light piston, Cessna size, aircraft. What with it’s compactness, low weight, low vibration and mechanical simplicity. In addition, a lack of low-end torque would not be the detriment in aircraft, like it would be in automotive applications.

The company has openly stated that their engine is more similar to a two stroke but works as a single stroke; it has the direct injection of a two stroke without burning oil in the same way as a two stroke. Additionally, one of the ICE institutions also said it is worth calling it a one stroke in light of this.

Reminds me the 'K cycle' engine that made an appearance in the 80's.

You could increase horsepower by adding 2 or more opposing sets of pistons.

I would think the pressure on the "wavy thing" in trying to convert energy to 90 degrees would be very inefficient.

I'm glad I watched the whole video before commenting. All the issues you raised had occurred to me and were driving me mad. So glad you covered them. Clearly no 2-stroke engine can work without some form of forced induction, whether this be from under-piston supercharging, turbocharger or bolt-on supercharger (as seen in the video footage). They will have a tough time patenting any aspect of this engine as all these methods have been used before in some form or other, for example, opposed piston engines were once common in marine and rail transport engines. The "wavy component" is not new either. It has been tried before in compressors, engines and pumps and has also been called a wobble plate (based on the "swashplate" concept) many designs go back over a hundred years.

Hello! The 'Wavey component' is called a Swash Plate! Regards

Usually these sorts of videos are just blue sky possibilities but this really makes me think of all kinds of applications. The dual drive might have applications in aviation for drones or some other vertical take off vehicle. Sad that the world started scrambling to redesign the internal combustion engine as it sails into the sunset. There is a startup with an improvement of a rotary style engine that is pretty impressive and much further down the development cycle which is worth checking out and might be an investable product line.

I like the healthy criticism of the author. Definitely, it's just another implementation of two-stroke opposite piston design, widely used in German submarine diesels or Ukrainian T64, T84 tanks or BTR4 APC. More of marketing, less of technologies. Substituting piston rods and crankshaft with wavelike structure may have some sense. However, it may be similarly used in standard four-stroke engines as wells. Nothing revolutionary, sorry.

What about cooling and cooling fluid circulation ? I'm sure heat is generated and air cooling doesn't seem ideal to maintain decent working temperatures !

We need this design in general aviation region to increase fuel efficiency.

I see fewer moving parts, so even if they had to UP the displacement, its a plus. I would love to try one with more displacement in a "Equinox" sized vehicle. We dont all want itty bitty vehicles.

I was glad when, a third of the way through the video, he said it's a 2-stroke engine, not a 1-stroke. Apart from the opposed piston arrangement, which complicates the design, It has fairly classical 2-stroke type scavenging, opening the inlet and exhaust ports at the same time, so it is unlikely to be as efficient as a 4-stroke, as a small amount of the uncombusted intake gasses will escape through the exhaust port before it closes. The video says at one point that it doesn't burn oil - which is an advantage - no quibbling about that. However, the video doesn't expand on how that is achieved. Does it have a sump? My first thought was "Does it use 2-stroke oil?" - but I guess it doesn't. However, pistons *_do_* need lubricating. It says, though, that the combustion chamber in a regular 2S is located above the piston, and combustion energy is transferred to the piston, but the conbustion chamber doesn't contribute to the motion. It only absorbs the heat generated - but this engine has pistons on both sides of the combusion chamber, allowing more efficient absorbtion of combusion energy. I guess it runs a lot hotter, then! Is that good? Most engines have cooling, either by a water jacket and radiator, or by cooling fins. How does this one get rid of the heat? However - regardless of its advantages, it has a bigger problem than that! In a few years, it looks like internal combustion engines will be banned in new cars, so this engine has a future of about 10 years at best. Probably less! When motorists stop buying fuel, a lot of fuel stations will close. Fuel will become difficult to find - and its price will go up, so all I.C. engines will become unpopular - including ones with a "wavy component".

Not insane, Not new, Not shocking just clickbait. The UKposts channel made me a sucker and they made money from me.

how is it cooled and lubricated?

Nice and simple, yet is it reliable? That is before the other two issues is it efficient and low cost? And as engines go as useful is it at workable RPMS, Touque, and Horsepower?

IS THIS FOR REAL? THE IDEA IS NOT NEW, I SAW PLANS OF A SIMILAR DESIGNED ENGINE 40 YEARS AGO, BUT STRUGGLE TO SEE HOW THE PISTONS ARE SECURED TO STOP THE OPPOSING PISTONS CRASHING, THERE IS STILL NEEDS FOR CONNECTING RODS. ALSO THE POWER DELIVERY TRANSFER FROM THE PISTONS TO THE WAVEY ROLLER COASTERS DOES NOT SEEM AS EFFICIENT WAY OF ROTATION AS A CONVENTIONAL ENGINE.

Imagine this little engine (or smaller) powering a generator to link on a EV motor. Jep,...I like that.

I used to work with a British design engineer (Mechanical) in the 70's, and he used to mention and explain "a" or "the" "wobble-plate motor"...... so it's been around for a while, although it may now be better developed. This looks like what my workmate was explaining and chatting about.

How fuel avarage bitween another engine like two stroke? And four-stroke please

Napier built this 100 years ago

What is the fuel consumption? 500 cc. I used to have 350cc 2 cylinders 2 strokes Yamaha motorcycle. Its fuel consumption is quite high about 15 km per litre.

i cant help but see a couple of opposing compressor pumps. Like found on your pressure washer pump. They work very similarly except they're powered by a separate motor. This is a melding of those two concepts together

Old tech this came out in the early 80's. That one had one swash plate in the middle. With a conventional value train. This is the same thing but using a traditional no valve 2 stroke.

Russian tractors imported by India were of similar design and liked by farmers.there was article in newspapers about it's popularity. This needs to be revived.

Does it possible enhanced up to 3000hp?

This is like the Doxford engine in use on Ships long ago. Its a two stroke engine.

It's a two-stroke because the Piston has to stop and go the other way to do another action if it did the intake compression and exhaust on one stroke it would be a 1 stroke but it has to stop and go the opposite direction in order for it to get new air so therefore it takes a separate stroke.

Good day thanks for the support and help 🙂

Reminds me of that MYT Mighty Yet Tiny engine that went nowhere. Looked like it was going to change the world like this.

I wonder if we could increase the compression ratio to make it a compression ignition engine also used as a diesel engine. We could use a less polluting fuel like ethanol.

I'm also wondering about lubrication effectiveness and engine heat management.