For anyone who's had to tear down and rebuild an engine, hearing it firing up again is possibly one of the world most beautiful sounds

9:08 To those wondering: This engine was not actually fired. Engines this size are started by compressed air rather than electric starter motors. It takes a while for the momentum, and subsequently timings, to build so that the engine fires correctly. That is the cause of the slowly increasing RPM or Hz of sound in the video. If the cylinders fire the sound they produce literally shake/vibrate your lungs and body. You would really want to wear ear plugs *and* ear muffs to stand next to this engine as it runs. Fun fact: Engines this size don't really have a huge span in RPM like in your car. They are pretty much just on or off.

For everyone asking on the huge engine at 9:08, googling the model number shows that it's a MAN B&W DM884WS-150, housed in Diesel House museum in Copenhagen, Denmark. Wikipedia " The largest of the engines, which was built in 1932 and remained the world's largest for more than 30 years, stands 12.5 meters tall and 24.5 meters wide and weighs 1,400 tons. It produces 22,500 HP and supplied Copenhagen with electricity. It remained in use during peak demand until the 1970s. During World War II a resistance group consisting of workers at the power station used the engine for hiding weapons. It is started up the first and third Sunday every month at 11 am and runs for 5 to 10 minutes."

3:00 that insane shift from regular beats to machine gun mood is insane 🤩😂

I think gallons per mile is the correct term in this scenario.

2:10 "How does your hearing survive that sound?" "No, we don't have potatoes."

"I'd like to purchase 1000 liters of fuel.." --"Oh are you going on a world trip?" "No I just want to start my engine"

3:35 you know, these engines are so damn powerful after 1 quarter mile they have to be almost entirely rebuilt as the stress that the parts endure is astronomical

The old badass that started up the V-12 Rolls didn’t even flinch when it fired up.

That guy starting the rolls Royce engine didn’t even flinch 😂

A remarkable LACK of sensible safety precautions ! (I have 55 years in Engineering ).

9:08 Seen that engine start in person, all I can say is that it's impressive

9:09 this is the typical engin that you can find on cargo ship. They are slow but powerfull for the high seas. And by the way, you can fit a car in the oil pan and can fit a man in the piston chamber.

7:04 imagine this guys neighbor. “ oh there goes frank starting up his jet engine. Typical Tuesday.”

The engineering behind these engines is super unreal , how amazing i felt watching this video while hearing the engines is beyond words , WHAT A W :) !!!!!!!!!!!

A big salute to all scientists and engineers who invented and engineered these magnificent beasts Absolutely love it

7:04 I bet those chickens were caught off guard by farmer Jon starting the ole barn turbojet again

The sound of the SD40 (2:50) is just mesmerizing! Like being inside a body and hearing a heartbeat. Fascinating.

5:07 The Thumbs up approval speaks a thousand words, this guys one happy dude!

I remember my grandpa bringing me to his office and showing me this video as a kid, without context. It was cool, and a great memory.

2:09 He didnt even flinch😂

2:50 straight up sounds like a heartbeat, Amazing.

3:20 kinda sounds like my washing machine

4:57 that propeller on huge engine is so cute lol

2:45 - can watch that all day. Brilliantly engineered, finely built for such a heavy duty engine. Great sound too.

I did a Dislike. Pictured engine was not in clip.

I dont think poeple know how much this means to me being a motorhead..it's like watching your baby..no..your dad waking up (giving how these engines are bigger than me haha)....im so proud and happy right now.

That 468 big block with the 871 blower sounded absolutely nasty! Love that sound.

Engineers: How many pistons? SD40: Yes.

5:02 look at that propeller so cute

My dad was a chief engineer on a big tuna seiner when I was a child. Loved going down into the engine room with him when the started the engine.

Some of these engines will bring a tear to the eye of any Ork Mekboy.

2:52 my heart 3:01 my heart when a girl accidentally touches me

2:51 honestly sounds like a beating heart

4:25 Chugga Chugga Chugga badump badump badump

2:12 Omg the old guy was like "Meh, not impressed." While sitting right next to that big boi engine when he started it. It just went Boooom at start up he didn't even flinch.

The beetle didn't look dangerous at all, with it's big exposed fan.

3:01 the SD-40 Engine Start Up Never Gets Old

The last one sounds and spins like music. The biggest old school DJ in town

So I'm sitting here doing my tax return and next thing I know I'm watching videos of engines starting.... How did I get here?

2:10 That moment when you sneeze after holding it in for too long.

Best "vroom-vroom" moments: 2:04 5:21 6:17

I'm 16 and I think engines are facinating. I was thinking of having one just for fun when I finish my studies and get my dream job

Great ad, I ordered the last one.

there's a 0% chance that Bug @ 1:34 passes California state emissions.

9:10 you can literally live in that engine

I want to feel the power of those monsters.

we are men. engine goes vrooom vrooooooom and we are happy.

2:07 What guys wishing their cold starts sound like

It’s all about smiles per mile. Every one of these engines makes me smile.

2:09 Dude's lack of reaction to the 'atom bomb' being started is impressive

I can't believe it. The video shows exactly what the title promises, nice!

5:55 this engine looks like a frog lmao

The great thing about this video is that it didn't spend too much time on any one engine. See it start - move on to the next amazing engine. Thanks for a fantastic vid!

2:10 sounds like a demon from hell that just got woken up from a nice nap and is now pist off

That 22500hp 8 cylinder is a chore by definition

Starting at 6:28, the sound of that DB605 twisting off was breathtaking. Just thinking about what that sound represented in about 1942-43....

0:34 HOLY SHIT THAT"S BEAUTIFUL

Clear winner here is that SD40 Startup

There ain't no way this guy mounted a Dc-3 radial engine to a VW beetle. that is awesome.

Me: "I'm going to bed early tonight" KZfaq: "lol"

Ahh, so these are the engines my neighbors are starting at 3 in the morning

Nah man that Ford flathead is just sublime. Its menacing and beautiful at the same time

Man once an engine gets so big that letting off the clutch makes it drive forward at 20 mph if you don't brake, I get the same goosebumps that the thought of being stranded out in the ocean gives me. The sheer power behind it is terrifying.

2:11 Like an absolute boss.

This video features a bunch of guys who reply "WHAT?" every time you say something.

Behind every giant engine, is an old dude who loves engines.

If you showed this to 8yo me this would be like heaven on earth.

@2:04 I've seen a Spitfire Merlin engine spin up live several times. It's a visceral and nostalgic experience every time in that it's the sound many WWII pilots lived and died with. I've also seen some of those old diesel threshing machines at country fairs and parades.

7:35 let's leave these batteries right below the flame spitting exhaust.

Miles per Gallon don't matter When You're Having a blast. I'm an engine enthusiast and love my classics 😎

It's neat that engines are basically a paddle ball where the paddle is a gun, gunpowder is liquid fuel, the string is a metal rod and the ball is a hunk of metal. Add couple of the paddle balls together and you've made horses jealous

9:08 Me starting up my ps3 at 3 a.m

that diesel locomotive engine sounded like a heartbeat when it was first starting holy shit.

I have been listening to Mechanicus OST lately, and the Machine Spirit now recommends me this. Praise the Omnissiah!

So many people in these clips had no ear protection 😮 may they forever enjoy their tinnitus

2:46 there's something a bit freightening about seeing these big metal parts moving so slowly but with such precision just awaiting them to speed up. I assume the sound being reminiscent of a slow pumping heart also has something to do with it.

I heard a top fuel dragster for the 1st time last year and it was one of the most incredible moments. The earth shook as it thundered past, rapidly bouncing down the track in a flash of fury. My glasses vibrated on my face lol. It was unbridaled extacy. (I have tinitus because I love loud sounds so much. It's horrible. I can't sleep without listening to rain to mask it.)

Locomotive engine has one of the best startup sounds

2:11--OLD DUDE DID NOT FLINCH!!!😱

4:30 is exactly that sound effect in cartoons

I hate HATE clickbaity thumbnails.

Nothing gets grannys heart pumping like strong powerful engine

i like how some guys just casually stand beside those loud ass engines without ear protection whatsoever lmao

9:09 what yall came for

That 500HP V-Twin is utterly terrfying. And I love it.

God damn, you would lose your hearing instantly near some of these engines

oh my god. Humans have built very powerful engines.

2:53 My PS4 3:01 My PS4 when I just start Minecraft

7:01 Wow! You have a turbojet engine... and chickens. Okay.

2:10 that old dude didn’t even flinch when the Rolls Royce engine started. He must have started up that thing hundreds of times

2:10 dayum imagine someone putting this in a Rolls Royce!

2:10 You know why he didn't flinch, because he can't hear anything after the first time he fired it up.

Just something fascinating about harnessing the power of controlled explosions in an internal combustion engine.

Nobody: That one Civic at 3AM: 7:24

6:07 miata owners: I'm in.

1:04 that's so nice sound :) 2:46 Imagine that engine in your car and you typically start to go to work at 7am :D It would be so satisfying to start it up every time :)

8:00 the only guy with *the common sense to protect his hearing*.

2:09 he didn't even flinch, that's a real og right there

I don't know how I got here but this $hit is fascinating!