One Stroke Engines - 200% More Efficient??

Are these 1-stroke engines paving the way for a new era of rotary engines, or is it just clever marketing? Together, let's unravel the truth behind the concept of single-stroke engines. We'll break down how they operate, discover what unique advantages they bring to the table, and address the burning question: Why invest hefty sums in R&D for internal combustion engines amid the global shift towards electric vehicles?

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00:00 - Intro
00:41 - Why is the idea of a single stroke engine so weird
03:27 - INNengine eREX
06:51 - How Does eREX Work
10:46 - eREX VS Average Two-Stroke
13:11 - Other One Stroke Engines
16:21 - Why Bother With Internal Combustion Engines

what we'll cover
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[ulf]

This could also work as a silent backup generator for home or a cottage.

[defaultdriftco]

It’s two stroke, the revolution gearing doesn’t change the fact that the piston reciprocates twice per power cycle of said piston.

[VikashJain-pmcx]

I'm not an engineer but found your explanations easy to understand. Great production quality as well. Clearly a lot of work went into producing it and it shows! Excellent!

[tok]

Your 'butterfly' swimmer is doing the 'breaststroke.'

[davidwolff]

The idea of the “range extender” is how I first heard the idea of hybrids described decades ago. A very small IC engine would be tuned to run at its optimal operating point to charge a smaller battery when needed and otherwise completely electric drive. It made a lot of sense to me. No transmission, the performance of electric drive but the backup capacity and energy capacity of gasoline when needed for longer trips.

[GodBoredWas]

Your ending comment regarding driving. I couldn't be more opposite. I love the sound, the vibrations, the gear changes, the clutch, the feel of being part of the machine. You want to be isolated completely from the machine. Different strokes (see what I did there?). Take care.

[chadjensenster]

This is just 2 opposing 2 stroke engines. To have a true 1 stroke, you would need to have a 2 stroke engine that has a combustion chamber on each side of the piston, so that it is pushed on each stroke by a power stroke.
Also, I love the idea of a sine plate. Dynamcam had a sine plate design in 1941. It had the benefit of completing 4 strokes for all 12 cylinders every rotation of the engine. This means that it could produce a lot more power for every rotation than a conventional engine. It was a very promising design, I'm not sure what ever happened with it. But it is still legal to have one in an aircraft to this day.

[AlbertoPinero]

The pursuit of efficiency will always be a worthwhile endeavor. To improve upon an existing or "old" technology is what many branches of engineering are all about. Also, what someone's education is in, or what their Linkin profile shows, is often not an indication of their full life education or experiences.

[paulslund]

The Range-extender concept is exactly what Ram's 2025 Ramcharger EV is: It's they EV truck with a smaller battery (150mile range on full charge) but with a 3.6 V6 engine to provide an additional 500 miles of range. The 150mile range on the battery alone is a good blend, as that should be sufficient for most daily use.. but for longer trips towing loads, the V6 would kick in.

I always felt this is how hybrids should work in the first place (I think Chevy's original bolt or something used to work this way?)

[hybridstoatdragon]

14:59. The reason its a prototype is because there is ABSOLUTLY no lubrication going on. It would be extremely hard to cool that or improve its long lasting ability.

[johnschofield]

The engines used on our patrol boats in Vietnam had a system of several rows of triangular engine sets that worked in a similar fashion. They were the Napier Deltic engine.

[slicksquared]

Interesting question at the end! In the 1970s, during the Arab oil embargo, I worked out a plan to make a vehicle much like you propose. It simply had a battery pack, individual motors on each wheel, and a "small but efficient" engine running constantly at its most efficient speed to generate electricity to recharge the battery. That plus regenerative braking would have created an extremely efficient vehicle with 4 wheel drive and "silent running". Had something better than lead-acid batteries been available, and had I more money... woulda coulda shoulda...

[mikehenson]

Old dude here.
I’ve never been against electric cars. In fact I can see the practicality in them, except for 2 big reasons. Range and cost.
Neither of which has been addressed to date.
And frankly changing every car or truck to electric in America is impractical due to the cost of upgrading the grid, and needs of large semi trucks.
I know they’re working on it, but we still aren’t there yet.

[schnitznschnatzn]

Ricky, the first thing I thought seeing this engine was "that would be the ideal range extender" for a serial hybrid. I have 2 BMW i3s that do exactly the same thing but with a 600cc 2cyl engine that is tuned down for efficiency and longevity and makes around 23kW out the generator. It makes it one of the lightest production EVs made so far.

[underwaterreporter]

The swimmer would have to inhale through one nostril while exhaling from the other 😂

[AlexFoster]

Why on Earth did you make the swimming analogy? It's even more complicated than engine lol

[JJonny]

My BMW i3 was by far the best vehicle I've ever had... Came with the 2-cylinder REX that I didn't use much. But when I needed it. It was there. Loved it.

[kennethblocher]

A range extender ICE for an electric drive vehicle. That sounds exactly like what Edison Motors is doing! They've taken the idea of a diesel-electric locomotive and made a diesel-eletric semi. It uses a small CAT engine running at peak efficiency to turn the generator to recharge the batteries or provide electricity for the e-axles.
They've also partnered with their suppliers to create retrofit kits for older pickup trucks (1999 and older, so far).

[ZyxwvuTJ]

I agree, call it synchronized double stroke or something different but more accurate. Interesting though.

[coorbin]

The concept of a range extended EV isn't new. I have a BWM i3 REx, which is one of the only production vehicles I know of that uses this architecture. It's essentially a "series plug-in hybrid", but what makes it a range-extended EV is that your primary "fuel" is electricity from the battery, which ultimately comes from the grid or home rooftop solar, and gasoline is supposed to be your secondary fuel, or support to bridge the gaps between charging stations on a road trip.

It works really well. The only problem with the series hybrid design is that it's less efficient than letting the engine directly drive the wheels. Toyota's hybrid architecture is "series-parallel" such that the engine can, in certain conditions, directly provide mechanical output to the drive shaft/transaxle. This is especially desirable if your battery is depleted and you're cruising at highway speeds, and even though it results in a more complex "transmission" (e.g. with a planetary gearset, or a clutch pack like the Honda Clarity PHEV), it is ultimately more efficient when running on gas than a series hybrid.

The inefficiency of the series hybrid is awfully clear when you consider how it runs when the battery is nearly depleted. It generates mechanical work, then a generator converts that to electricity, then that electricity goes into the battery, then the battery gets discharged to drive the electric motors, which convert the electricity back to mechanical work. Every time the energy is converted, you lose some efficiency. Even if each step is very efficient, when you combine them together, you lose a lot of energy. Regenerative braking helps a lot in heavy traffic, but if you're going at highway speeds over long distances, running on the REx is gets pretty poor MPG. It's in the high 20s last I tested, like 28 MPG. Icky.


If I had my way, we would adopt one of these small-and-light "generator" designs -- this one or some other -- as the range extender in a so-called "series-parallel plugin hybrid" with an architecture similar to the Toyota Prius Prime or Rav4 Prime, but with a much larger battery pack. Let's say we can shrink the weight and size of the engine by 50% and triple the size of the battery pack. This would give us an EV range around 150 miles, which is enough for all but road trips. Then we'd have an 8-10 gallon gas tank which can easily bridge the gap between charging stations, even if you pull into an Electrify America station and all the chargers are broken. Oh well, just drive on gasoline for another 20 miles until you find the next one.

A car of this design would work perfectly fine even in a charging "desert" (where all the chargers are broken, or they don't exist), and at a decent fuel efficiency, too (probably 40 mpg or higher in a mid-size sedan configuration). But it would also have 150 miles of EV range, so if you charge it up at home, nearly all trips, even "regional" trips (say, trips from the Baltimore area to the Washington DC area) could be taken completely on electricity. But if you needed to drive out to the midwest, and you couldn't find good chargers or didn't have time to stop, you could just keep driving on gasoline, and fill up every 200-250 miles at a gas station.

That would be the "dream car" for me, and I would probably buy cars that operate on that architecture for the rest of my life. 95% of my driving would be fueled by the grid (so, its "cleanliness" would depend on the energy mix of the power grid) and partially offset by my rooftop solar. The remaining 5%, those long distance trips, would not require me to rent a car -- I would just use gas to the extent necessary.