One of the first Four Cycle Gas Engines - The Otto Silent 7 HP 1884 

Something about hearing these old engines running Just calms me down.

It looks like it's on a table until you walk behind it.

oh man thats a lovely sound. you hear all four cycles. and this guys tech is still dominating the world. i cant imagine any new tech stay valid this long. german precision is not a myth.

Look at everything that exists because of Nicolaus otto, if it wasn't for this humble 7hp engine and the genius behind it we wouldn't be seeing the builds that are making over 1000hp not to mention just normal every day cars, all I gotta say is Nicolaus; good on you man, your legacy changed the world

Sounds better than most music that's on the radio these days.

Would be nice to have included a more in depth explanation of what the components are and do.

Im just a little curious why they're running it so slow, it makes me think restricting the rpm is what's making it misfire. Either way it's pretty cool to see something so old in working condition! Also it's pretty neat to see the oilers keeping all the parts lubricated. I think it's really neat how everything was built to serve a purpose while also making it interesting to look at as well!

VERY NICE Chris!!! Thanks for sharing.

Such a beautiful piece of history and an even more beautiful piece of machinery.

What a beauty! Thanks for showing it.

I would not be surprised if J Leno didn't have one. This a very cool engine. I could watch it run all day. Thanks all for showing it..

I'm falling deeply in LOVE with this Engine...!

Fine looking engine. Thanks Chris.

Immagine you’re at the International Exposition of 1867 and you see this piece of machinery for the first time

a close up was nice to se every thing!

Wonderful discovery of that time.

7HP at a working rpm of 160 gives a torque figure of 229.775 lb-ft, or 311.534 Nm

Some explanation of the function of the moving parts would be nice.

awesome, thanks for sharing. the only thing i would like to see different is it actually running at 160rpm

Beautiful!

wow, what a fabulous engine. thanks for sharing!

Just a few days ago the Technikum museum in Germany got one of the 6 remaining Brayton engines running... Otto purchase the Brayton in 1875 to study it's operation. As far as I'm aware this is the first time an original Brayton engine has run since the 1920's ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g7h3Hd40GfY.html Very cool!

So, how did anybody get any work done with this machine providing such entertainment? Great video.

Immer wieder Spitze

Also, I watch the governor drop and see a cam follower move over the cam but can not see any motion elsewhere. A narrative for the sequence of events would be helpful, withclose ups to see it happen.

Very mad scientist, especially at startup. And when it has it's little steam or smoke purges...

For the time and the condition...!!!!.... these engine was absolutely perefect..... fruit of the genial mind of these people...Only to admire...

Amazing machine

Fantastic !

That's a beautiful, historic engine. I am fascinated with the slide valve and how the ignition works. Gonna have to do some research! Also; thanks so much for putting the text description at the beginning of the video! I hate it when an interesting engine video is posted but there is no backstory on it! :)

How was the fuel ignited? Was there a doorway in the top of the cylinder that was opened at top-dead-center that exposed the gas to the pilot-light?

beautiful. I was wondering if you could answer a couple of questions. 1st is, what are those six spring loaded adjusters for coming out of the top of the head? and is that clanking noise coming from the rocker?

Magnificent !!

Sounds so good wtf

So cool. Mechanic here that would love to know exactly what's going on here. Trying to figure it out but it's tricky haha, meanwhile probably very simple!

that is so cool, what was it used for in its first application? other then just cranking it over and saying "its alive!!!" for me that would be a good enough application.. a very interesting peice of history awseome to see it running so well.

More questions than answers. What the hell is the ignition? Compression ratio? Torque?

What a great video - if only they were all of this quality! There are a multitude of lessons here for 99% of RU-vidrs: 1) Stand still and hold the camera steady 2) No zooming. 3) No panning 4) No music 5) No vacuous chatter I can but dream . . . .

Amazing.

I am new to this topic and am aware of the original Otto slide valve engine from the 1860s and at least one reproduction. But wow. Talk about the "Missing Link!" This installation is priceless. I would like to know the provenance of this particular specimen. Where it was made, where it was installed, what did it do. And how the hell do we still have it! Of course I know nothing of the models either before this one or what came immediately after it. This looks like the golden age of industrialization. Suddenly home gas lighting (coal gas?) eliminates the entire external combustion boiler monsters for smaller scale needs. And how much would this thing cost to buy? How much daily maintenance was normal? It looks like it could simply run like this indefinitely.

Amazing! What were the applications of this engine back in the day?

It's amazing to think about that this engine is older than the car. The first car was made in 1886.

Is ignition done every two Otto cycles?

Would be nice to be shown how it works.eg Ignition and govenor

Does it ignite 1nce, in every 8 cycle's, when no load? Nice example, of craftsmanship btw. Namasté.

That's awesome

excelente vídeo me apasionan las aviones

Giving the size of that its hard to believe its only 7HP! Theres 7Hp engines today that you can hold in your hand!

Deutschland ist wirklich das Land der Dichter und Denker.

It's interesting that there's no spark-plug like in a modern engine but instead a pilot light like on a furnace. When was electric ignition added?

Did any of these run on hydrazine?

Im some what confused considering the working principel of that engine why wuld you use hydrogen when you have propane? Is the hydrogen used to create somthing like pre ignition chamber ore implosion effect ? to my that thing does not have any magnetos ore similar It hears like combustion compresion ignition usein internal/external burning engine so perhaps it is bouth? bigest confusion is that dual fuel usage thing

😕 Whoever called that contraption silent must be cannon def. 🤣

How do you get that on a mower?

Not seeing or hearing a four cycle engine, its a hit and miss!

Were they ever used for non-stationary applications before Karl Benz invented the automobile? I would think that an obvious application would be for powering a boat, since there is no risk of a boiler explosion and one person can run it safely.

Lovely to see it running But it's a shame that so little information was provided or even better still a walk around pointing out what does what

CHRIS, IT MAKES 7 HP BUT THE TORQUE MUST BE ENORMOUS. ANY IDEA HOW MUCH?

Def neat-O

why all your engines are horizontal?

Is this spark ignition?

It's crazy to think my pressure washer has almost 2x the power and is about 5x smaller

Was this a "hit and miss" engine. That would account for the firing only happening as the engine slows.

I know it may be considered priceless, but if it had to have an appraisal, I wonder what it would be?

Sounds like Ron Swanson

i bet it has way more then 7 lbs of touque tho?

By 1983-1990, in India (the least bothered country in terms of engine evolution), the humble TVS 60 moped made half that power of 3.5 bhp out of just 60cc 2 stroke puny engine-bore. And that moped, sold a millions by 2022, in less average income people country. ☺️☺️☺️

It's a water cooled engine ?

where did you find that?

You should put this on a dyno lol.

Notice how a lot of other manufacturers copied these engines ?

The 4 cycle terminology is wrong, this is a 4 stroke engine consisting of suck, squeeze, bang, blow. Four strokes which make up one cycle.

It's a boxer engine sweet

and now my 50cc scooter engine can do 7hp which is not much bigger than my hand

steam punk right there

When woman in 2022 be needing...

Now I know where the term horse power comes from, part of the noise it makes sounds like horses trotting on brick streets.

Not 4 stroke. It’s hit and miss...

This thing is a monster and only 7 HP ? it's really scary. The exhaust from these engines are responsible for the death of millions of people. I am not impressed.