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Huge thumbs up to them building a working prototype and making a video of the engine running! That already sets them apart from 99% of the other "innovative" engine designs.

The side pins that are connected to the gears are submited to great forces, by being supported on only one side, the bushing/ bearing will fail fast.

I think the age old problem with all engines with sliding type valves will be sealing the ports properly when they're closed.

Lets crank the friction WAAAY UP for...some reason.

No, it’s a 4 stoke , one rotation engine. A rotation and a stroke is not the same thing, has never been the same thing, and will never ever be the same thing 🤦‍♂️

It's relaxing to watch these videos. However, with more moving parts, it may be more unreliable than a conventional engine Edit: the compression stage will force a load onto the piston, which will be transfered to the connecting rods. The resulting opposing forces are not completely canceled out, as they are a perpendicular distance apart. This forms a rocking couple which tries to rotate the piston from the top and twist the connecting rods, putting a lot of physical torsion on them.

There is a lot of rotating mass per cylinder compared to a traditional engine, with additional losses through the gears. In addition the head design seems limiting. It is good to see innovation but it is unlikely this engine will be more efficient than a conventional piston engine.

So at half way in the video you make it seem like the engine is way better than a traditional engine in terms of performance but later down the line you say that the engine is actually at a 2:1 gear ratio by default so its actually the same. Honestly I don't expect these engines to make it to the market because the seals are probably not going to be able to withstand the harsh conditions as well as poppet valves can

First thing I notice when I look at it are the straight-cut bevel gears. How much do I believe in its longevity and reliability, and why "not at all" is the correct answer?

Actually the piston does indeed rotate. Just because the cylinder rotates with it does not mean it is no longer rotating it is just that the cylinder rotates with the piston. I don't see how this extra rotational force could defeat the standard piston engine of the same caliber. Sometimes less is more.

looks like a diving arm bread mixer

This is the first video of yours I've came across, but I'm impressed and now subscribed 👍 Really fascinating engine concept...

Lot of friction losses. A stroke isn't a rotation btw.

This engine can easily be turned into a 2-cylinder opposite one by combining 2 1-cylinder engines

This would be perfect for a lawnmower because of how it can be positioned and how it can have a lot of output torque in addition to being able to have 4 stroke rotation with 2 stroke speed makes it more fuel efficient 😅

How did they get the rotating valve assembly to seal properly?

How does the oil get to the rod and main bearings?

Interesting! We tend to see a lot of new engine design ideas and most of them kind of peter out. I hope this one does better. There are myriad uses for a small, light engine. Generators, personal watercraft, scooters, Jaws of Life, emergency water pumps for flooded areas, leaf blowers, air compressors and other shop equipment.

There's a lot of weight spinning there which translates to lots of inertia. Tuned trucks for car shows often tend tilt to the direction of their axle shaft spin since they're much heavier and faster spinning than regular, stock ones. There's a chance similar issues will happen in vehicles powered by this engine, especially aerial ones.

I always love to see different solutions for an problem (in this case creating torque out of fuel).🤩 Some pretty mind blowing concept, complex but rather simple at the same time. I wonder if a diesel version would be possible? 🤔

I'd be interested in seeing a pre-combustion chamber in otto cycle which is possible with the side ports since you need a second injector. Then the supercharger that it needs when you do that on the output shaft

I can see the top ends of the rods producing a twisting force on the gudgeon pin 😮

Good concept, but I bet, IRL it's way more complicated. And I don't believe it's ever be more powerful than conventional 2-stroke with that volume or that mass.

Now put the piston inside the shaft with rotating valves in the shaft walls.

The primary efficiency limiter in a piston engine is the crankshaft, which allows zero torque to be produced at the top of the stroke, where the ignition pressure is highest and hence the greatest potential energy exists. Maximum torque is only realized at mid-stroke, where the pressure is greatly reduced. Using two crankshafts does not change this formula, but does bring the added burden of eccentrically loaded bearings and hence early bearing wear, plus all of the added friction of incorporating a differential into the engine. While this design is novel, it does not bring any tangible benefits.

Interesting design, wish them all the success with it. Would love that cutaway model for my desk :)

The Germans are always worried about "Umlauf unruhe", or orbit discordance. This are the much higher loads, or moments of the piston given over a certain degree of the crank revolution. Normally the flywheel takes these punches and equalised it to a certain, acceptable degree. The thick cranckshaft transfers the loads. It is thick, heavy. In this engine certain toothgroups of the cogwheels are extremely high loaded and others are a barely loaded. Now these tiny tooth must transfer that explosive loads, and they are much smaller, hence very high loaded. It could work for short period, like a drone.

Heck with this new engine... I want that GAME you're pushing Yeah baby! Thanks so much. You RoCk

Yeah let's add more moving parts create more friction and wear!

No mention of the extreme friction and sealing between cylinders, or the rumble of the the whole thing rotaring on gears....Nah

The biggest issue I see are crank bearings living a short life. The downward force on only one side of the crank will cause the bearings to be stressed, being caught in the fulcrum point of basically a lever. The piston will be pressing "downward" on one end and the gear pressing "upward" on the other. Similar to rowing a boat with the bearing in the pivot point for the ore. Perhaps a ballbearing design may relieve some of that direct pressure.

I can see how the timing could be controlled by an ECM. I wonder if side port configuration could be modified to turn the engine into a 2 stroke?

It appears to have somewhat of a rotary valve, meaning that sealing won’t do well in the long run.

The only concern is sealing of the rotary valves. This is an emissions issue for hybrid cars. There is a reason rotary valves have been tried again and again and not used. E.g., British WW2 aircraft engine development bet heavy on rotary valves. RR gave up early and why they were the sole initial contender. For drones, a good concept.

When will these be available at Harbor Freight as a Predator engine ?😃👍🏻🙏🏻

Why not make it a 2 stroke and keep the piston stationary while having the ring gear rotate? Seems that would work better

If the output shaft could be reconfigured to exist to the side an opposing piston might be doable. If so the displacement would be doubled, 100% more, with less than a 50% weight and size gain.

Rotary disc valve thing. Won't seal properly. Why not make the piston rotate and have a conventional top?

Very cool design, but the rotating valve setup will be the Achilles heel. There's good reason why we've veen using poppet valves for over a century now.

This piston engine's now connected to the rear differential - No transmission, no driveshaft, no pinion gear - Just piston direct power -|- Wonderful 😊

The rings dont rotate, the inner combustion cylinder does, spark plug is affixed to outer stationery cylinder and protrudes into central axis port seal.

Picture this thing on the power stroke with tons of cylinder pressure from super - or turbo- charging. One rod generating side thrust. The other rod is generating side thrust in the opposite direction. The rods cannot both be on the center line. So the opposing side thrusts result in a torque or moment on the piston itself. The only things stopping it from rotating in the bore are the small ends of the connecting rods being on a common wrist pin.l It is a suicide-drone engine and that is about all.

I must say nice clean design with exhaust & intake ports but when I heard 1HP for 1Lb weight then it seems we already have that engine being manufactured under PowerBee 894 brand, which exactly same weight (15Lb) and generates 16HP and is very simple 2-Stroke design with parts that lasts for 20 years or longer. This additional gears & double acting crankshaft will see a lot wear within 6-months or even earlier depending on where it is used. Besides moving Cylinders & Moving pistons- good luck with that.

How does the rotational motion get to the output shaft?

This seams to also be very very well balanced. So max rpm could probably be higher to.

When under load the off center connecting rods angled in opposite directions will make the piston try to twist which will try to bind up the rod bearings creating extra friction. This and the compound gyroscopic forces from cranks rotating on rotating axes seem to me the biggest problems with this design.

Neat. I'm looking forward to seeing this in motorcycles.

Considering how massive and wide the spinning mass is, I want to know it's top rpm. Reasonably it could still be a high revving engine. Big sliding cylinders do need a lot of precision and oil.

What keeps both connecting rods in time? The gear it's driving?

with 2 con rods going in opposite directions, wondering if secondary balance may be near perfect also....... 🤔🤔🤔🤔

Has anyone ever seen that spining anti gravity device from the 70s? This looks a lot like that.

Waiting for D4A's video on this now

This is a great idea!

This is similar to the rcv sp 60 engine for rc airplanes that was produced 20-30 years ago

Looks like it will be this versus liquid piston

To me it would seem to work better if them moving cylinder parts do not rotate and only the outer casing rotates... it's like making an electric brushless motor...

In 1974 my Honda XL 250 had 23 hp.

I've seen the exact same concept about 12 or 15 years ago and it doesn't changed a bit. All the same problems with unnecessary piston rings rotational motion added, unnecessary gears, cantilevered crankshafts and difficulties with making the engine bigger than a single cylinder one (it's possible yet difficult and expensive). In conclusion this engine doesn't make much sense because of added mechanical complexity and cost with almost non-existent benefits (only real one is it's balance but it could be achieved without all that gears and complexity).

i think its a scaled up rc airplane engine thats. been around for a long time

Suck, squeeze, bang, blow. That's a 4 stroke in 720 degrees of crank rotation. It doesn't matter that the piston and cylinder only make one horizontal revolution, the crank is going around vertically 2 complete times, 720 degrees, to complete each cycle. I would think that what limits rotary valves would also limit this engine, seals and lubrication for the ports. Still, a novel and interesting design.

It still has a reciprocating piston but with this engine it has double the reciprocating mass & double the moving part's, & its only a drawing.

I'm not anywhere near an expert in this field, but this looks to have several issues imo. For one, you're trading a sequenced line of firing pistons with offset and distributed weight for, in this case, a piston and combined crankshaft arms all firing at once (yes, they are weighted, but that really only reduces the existing problem of vibration), which means youre occilating say, a plane prop back and forth as you're spinning it, which kind of makes me think this would vibrate a directly connected prop to pieces after a little while. Another thing is that saying the piston doesn't rotate is innacurate, it does rotate, and so does its casing, and in my uneducated brain, I imagine that rotational energy would make the piston constantly be fiighting the centrifugal urge to rub up against the casing as its firing, which would wear it down really fast. That's to say nothing about those seals around the spinning casing wearing down, and the fact that the seals around both the injection and exhaust ports are ceramic. Like I said, I'm not an expert, so Im just talking out my ass, but hey, Im glad to be proven wrong. I'm into the idea of new and strange advanments in tech and mechanics.

I'd like to know how much efficency is lost with a conventional single cylinder four stroke engine as apposed to this engine. Yes, camshafts and valves suck away a bit of energy, but at least they aren't going to sheer the gear teeth off like this might.

It is definitely a 4 stroke engine. Even the CEO of Avadi calls it a 4 stoke engine.

Obvious problem - friction in "valves" as well as tight seal. Impossible to maintain for long. Poppet valve is a winner for a reason. Second issue is a bearings on both crankshafts. Room is limited and piston together with crown gear trying to bend that bearing in exactly the same direction. It wont last for long

It reminds me the Duke engine ...😊

Just because you can dosent mean you should ..

Scalability. Conventional ICE is pretty easy to scale - add more cylinders. What about this one?

Now make a twin cylinder.

Piston speed will be a problem at high RPM, on the flip side I know of a engine design that has been running for over a decade on petrol & hydrogen, it is of comparable size to this design, it is over 600cc, fires 4 times revolution, has the equal to 175mm stroke of a piston engine & has only 5 moving parts.

why is no one talking about balance?

It sounds like and old Singer sewing machine!

Good luck to them in making this work but far simpler development is putting rotary valves on a conventional engine & the sealing problems around those valves have not been successfully resolved & 100 years ago they had sleeve valve engines (that even progressed into some high performance WW2 engines) but further development on them wasn't seen as worthwhile so whilst hopefull that they can succeed here history is somewhat against them (unless they manage to solve what others have failed to do).

The oppertunity for range extending engines for EVs was two decades ago when there were only a few but squandered Electrified projects like the EV1 If they weren't subject to corporate sabotage, god knows how far have new combustion engine designs may have evolved by now. Fiat in 2024 is only talking about a REx for the 500e despite Fiat hybrid, PHEV and EV concepts going back to the Cinquecento and Mk1 Panda.

Good for lawn mowers also?

I imagine manufacturing costs will be high.

96HP from 1500cc engine? That is not impressive. The only advantage I see is it’s weight and size, which has its place in certain applications.

Why didn’t they compare it to a race bike?

1 stroke? Ridiculous. Its still a 4 stroke, but has a gearing before the output shaft.

That looks like a fucking disaster

How is it "virtually" a one stroke engine? It still makes 4 strokes. It just does it in one crank instead of two. By your logic my car is "virtually" a two stroke engine...

Um motor 2 tempos diferente

Brilliant design, & I do hope the Avadi company succeed with it! If they're able to force air around the rotating cylinder to cool it, then maybe it could be possible to also incorporate a forced-induction system along the same lines?

BMEP of 1.2... Not impressed. There were 50cc motors in the 70ies that had 14+hp made by Honda. Also. Those are rotary valves. They are worse than poppet valves at sealing and inherently leaky. (So EXACTLY the same problem as rotary). The gear meshing will take at least 8% efficiency from the getgo, because it is similar to differential gearset.

Those bearings will oval

So uh.... life of that wrist pins gonna be what 20-30 hours? This is a joke, it will have NO reliability. Rotating the piston rings is also a nightmare. Hey, on the bright side, if it weighed more it could be a boat anchor.

It would make more sense to make this engine diesel with a supercharger, it would be super efficient

very simple intake and exhaust. i suppose its not very tight but im sure it can have quite insane rpm. also it intake and exhaust are completely undisturbed by any valve like in traditional engine. yeah i guess that is cheap engine for suicide drones for sure. wonder if it was used on any.

why..? it's just reinventing the wheel and isn't gonna be used even if it's better. the standard aint gonna change

For how many hours can the piston and piston ring survive?

This engine would break very easily

So no oil at all? That doesn't make any sense at all

Why not give each wheel an engine

the rotary valves are the issue. not going to solve that problem easily.

Too complicated, cooling issues, will never reach high RPM, where are the bearings for the rotating cylinder/crankcase. Comparing to a Honda ATV engine is a low bar for power output. Roadracing motorcycles of 250cc when they were 2 strokes reached 100Hp.

bien ahi repman en english

That would kill the piston rings. Just nuts.

Longer stroke and inject diesel and we are in business...

Hondas oval piston used two con rods. Waste of time.