Why It's Almost Impossible For An Engine To Rev Over 20,000 RPM

[@carhawara3394]

"Isnt limited by physics, but rather by mother nature!" These are sentences that Start riots at technical universities

[@esh92]

yeah that was a dumb sentence

[@BunnyBUNGALO]

You're not understanding the context. In that video they showed it would be more than possible to break the world land speed record if there was enough space, but there isn't enough space on the planet to break it. Thats why.

[@jaykoerner]

@@BunnyBUNGALO how is that not related to physics.... Literally anything could be attributed to physics,

[@MX26_]

@@jaykoerner It is, and in a way it's caused by physics, but physics would allow for more top speed if we had a long enough stretch of straight road. Still a bit of a silly thing to say, but it kinda makes sense.

[@thomasrogers8239]

Had the same feelings and thoughts.

[@lucasaal61]

"its impossible to an engine to go over 20k rpms" -My dads fiat engine when i used to miss shift at 120km/h "No, it ain't"

[@TheTyisawesome]

☠️☠️

[@elweewutroone]

💰 💴 💵 shift

[@shenaniganshop3309]

😂😂😂

[@oscardbg9654]

As far as i remember, f1 engines used to run at almost 20k rpm...

[@Stand_Tall]

@@oscardbg9654 think they were limited at about 18 000 rpm

[@inniyewtesfaw2003]

"impossible to rev over 20,000 rpm" that one Honda at 2am: watch me

[@eric97909]

Or rather, Listen to me

[@ValentineC137]

@@eric97909 you say that like we'd have a choice in the conversation

[@ellogovna8329]

have anyone heard of a super bike that can reach 52,000rpm? its called the MTT Y2K.

[@ellogovna8329]

it powered by a turbine from marine turbo technologies

[@ellogovna8329]

it can also outrun a veyron in a drag race

[@eriklona8806]

F1 engine's stroke is just above 2 inches. 😏 I had a feeling we had a lot in common

[@KayJblue]

3:18

[@the_icon_of_sin_94]

Same

[@superior6564]

"I have a small dick" 😂 "LOSER!" "I have a big dick" 😂 "LOSER!"

[@boywithoutsoul587]

Well you don't drive F1 cars on streets and most of these females are made for the street.

[@eamador83]

I’m dying 😂

[@Grumpy_old_Boot]

He forgot one big problem of high engine RPM ... lubrication ! Once the pistons exceed the speed that the oil film can hold itself together, the film "breaks", and then there's no lubrication. Once you have metal-on-metal movement, friction rises drastically, producing insane amounts of heat. And if it gets bad enough, it can fuse/weld the piston to the cylinder ! And then everything explodes !

[@waynewhite2314]

exactly...I think above 600feet/min with hydrocarbon oils

[@Grumpy_old_Boot]

@@waynewhite2314 Add another zero, and you're in the ballpark of most modern sports cars. But yeah, new oils are better at high piston speeds. 😀

[@waynewhite2314]

@@Grumpy_old_Boot yeah I think it feet per second...my bad

[@Grumpy_old_Boot]

@@waynewhite2314 No problem, it's all good. 😀

[@tiagofigueiredo2529]

Honda rc115 says hiii 👍

[@The_Mup]

"This week on money pit, we're gonna put koenigsegg's freevalve system on our miata!"

[@wowgodiamond]

"super expensive" The guy said he installed it on his Miata engine for less than the cost of a nice exhaust. Sounds pretty cheap to me for the installation of Free-valve technology.

[@nszngaming9372]

Yess lmao

[@JosephRedfern]

(For anyone wondering: kzbin.info/www/bejne/e2que5KcbLd4fdk)

[@RCTanksTrucks247]

Good old CBR250RR revved over 20k. Loved that thing!

[@danieltasker8012]

Or a lot Honda’s 60s and 70s race bikes

[@Popsicle_MP]

i'm pretty sure they redlined at 19,000 and only if they had their ECU adjusted or you bought one meant for the Australian market, all the models built for the Japanese market were restricted and peaked around 17,000

[@obsgr1]

23000rpm. I had one. It was phenomenal.

[@huh2634]

@@darrengolladay9359 nope, cbr250rr's are 4 stroke..

[@screamfingers]

Yes my dude one hell of a bike. Makes all the right sounds.

[@scenicdepictionsofchicagolife]

I feel like nobody remembers about Desmodromic valves. They are the literally unaffected by valve float as the opening AND closing are mechanically controlled! :D

[@zorktxandnand3774]

Well they constrain the valve position by not only opening the valve by a cam, but also use a cam to close the valve in stead of a spring, thereby not allowing any valve float. Only problem is that the load on the closing cam increases with RPM, while it reduces on the spring. I don't think a Desmo could go as high as 20K Also it turned out the valve float they tried to fix was not so much a problem of RPM, but more of valve spring oscillation. This is more easily fixed by using 2 or 3 smaller valve springs (with different resonant frequency's) in stead of 1 big spring.

[@davelowets]

Desmo valves are NOT the answer

[@FuSiionCraft]

2 strokes and rotaries : *idle at 50k rpm, rev at infinity*

[@jochen__]

*laughs in Simson 2 stroke engine*

[@jochen__]

@FichDich InDemArsch Yeah but MZs also don‘t rev that high.

[@therandomman6647]

No valves so they rev as fast as you can put fuel and air in them

[@Sakura4348]

@@therandomman6647 sooo multiple inline turbos all with increasing boost and insanely large 1000 cc or bigger injectors?

[@michelguevara151]

@@therandomman6647 reedvalves and transfer ports, sir! do you know nothing of expansion pressurisation exhaust gas valving? those spannies stop unburnt fuel being sucked through at higher rpm causing over burn of the incoming charge, the reeds stop mixture being forced out via the carburettor, and the position and dimension of your piston's porting is your inlet valve and timing. then there's powervalve solutions of various types.. lots of valves in twostrokes, more in fact, more diverse.. some a little more theoretical.. but not as barking mad as intersectional feminism. ungineering mate.

[@additin7470]

Mom: *money shifts my Miata* Cylinder 4: “20k RPM? That’s easy!” Air Force One: “Something just hit the tail of the plane....”

[@ahmedneamah7836]

Hahaha cheeky

[@Thri11seeker]

Lmao

[@heygek2769]

Rodney!

[@fbi3544]

Rotary: *Am I A JOKE TO YOU?!*

[@imluna6455]

@@fbi3544 yes

[@matteoprada5851]

2 stroke: *HELO*

[@mitchsharp5718]

That moment when you’re standard 2stroke bike Revs to 14000rpn

[@710Canada]

The 02 ZX12R could hit 16k. 4 stoke 4 cylinder.

[@cameronbitz9124]

@@710Canada so not 20k

[@fabionajazi6180]

I seen two stroke bikes on a video revving up to 21.5k

[@710Canada]

@@cameronbitz9124 wow, aren't you gooder at maths... 14k isn't either. Or is it?

[@mr.levintouge154]

Bunta: "Be sure to rev it up to 11,000rpm Don't lose."

[@willthethrill2078]

Noticed you senpai

[@jrojassengard2586]

Takumi: what's a '86?

[@ThisIsCexary]

What color is your 86?

[@kylemelcher894]

The RPM of Jerry’s heart during a Keeps ad is 100000000000

[@mikesuarez9615]

LMAO

[@car-enthusiast3141]

Lol

[@honeybadger0562]

That’s why he needs to donate to the Ronald Reagan medical center so he can have a healthy heart

[@thomashanson6603]

I love the fact that this suggests that his heart is just like rotating in his chest lol

[@jasonander4964]

@@thomashanson6603 HAHAHAHA imagine a surgeon about to give him a transplant or something and they cut him open and just see his heart spinning OBSCENELY fast

[@faustin289]

"...not limited by physics, but rather by mother nature." Is there a difference?

[@TheTyisawesome]

Yes one is a fact the other is opinion...

[@faustin289]

@@wubalub2535 do you have an argument to advance? Or you're just trolling the internet spreading toxycity.

[@daszieher]

@@faustin289 trolling the internet spreading toxicity? Sacrebleu, mon Dieu! Nooo! Who would ever do such a thing? 😱

[@psmv3]

@@daszieher cdn?

[@psmv3]

cdn?

[@nellyishtari]

The valve: *floats around* The piston: - Go back to your seat!

[@xjmg007]

The valve: (taps piston) no

[@nellyishtari]

@@xjmg007 The piston: - I said, back to your seat, it seems your guide haven't taught you anything

[@aaronbryan5095]

@@nellyishtari engine block and cylinder head: Oui, wtf are you 2 doing?

[@squarepotatoe]

Valve: I like your cut, G. Piston: SMACK Valve: EEEEEEEEEEEEEEEEEEEE

[@limegreenracerpro3369]

If you really think about it, it's almost like a game of chicken. Just repeated.

[@gameeverything816]

I've watched a lot of donut videos and this one in particular is fantastic. The editing, knowledge, pacing, and actual interesting information was spot on. What a great video.

[@drtm1718]

Basically, Jerry at the end: "your mom should have sw--" Donut: "Cuuuut!"

[@jeanm.9570]

Yeah, I don't know why they included that bit when they even didn't let him finish...

[@pdtrjck8068]

@@jeanm.9570 like the mom shouldn't have let the dad do

[@saims.2402]

Imagine having engine’s with pistons moving faster than the speed of sound

[@samantharondeau4580]

Wonder what the exhaust note would be lol

[@zirkh1609]

@@samantharondeau4580 it would be deafening for sure. Just imagine multiple Sonic booms in fast progression. You would hear the exhaust note for a second and then hear close to nothing the next

[@HappyDude1]

They do that allready Edit Im wrong i did some calculations and its moves about 10 m/s at 6000 rpm if you count in both directions its 20 m/s And the speed of sound is 343 m/s 😆

[@randominternetguy]

Can't imagine this happening in a modern 2 or 4 stroke cylinder. There might be some gains from this new variable compression engines from a couple of companies, as the implementation reduced piston side load a bit. Still regarding piston engines though, I don't think it's near enough that an engine could surpass 24k rpm, as the con rod is the issue more than the pistons. However there may be a few rotaries, ie the Atkinson rotary, that may surpass this 23000rpm barrier quite easily. As I recall though the Wankel rotary is no good for this purpose, but I did hear that people got pretty close to record rpms with 13b motors. I also recall that the valve actually had little enough float that honda was using valve springs for it's first record setting f1 test engine. Ordinary valve springs.

[@trevorsangsland7572]

When something breaks the sound barrier the affect it has the air around could cause more issues i dont if you've seen a jet or a bullet in slow mo breaking that barrier but I think that force could potentially shoot the piston down in the cylinder. I could be very wrong tho "When the object reaches the speed of sound, air cannot readily move out of the way and a shock wave is formed. When the object is moving faster than sound, the resulting sounds travel behind the object, creating a sonic boom." (www.school-for-champions.com) So what were to happen if you created a sonic boom in a cylinder

[@ammkdagoat3499]

Jerry: " uno, dos, tres" KZbin ads: "allow us to introduce ourselves"

[@TheIcyWulf]

Yes.

[@IMattayy]

I'm sure they time the ads for things like that Any time I get an ad like that I just think how about you fu*k off *clicks why this ad, don't see this ad again*

[@baraaalasfar5841]

I’m dead

[@drearyfying249]

KZbinrs can decide where they put ads. Also, download KZbin Vanced. I haven't seen an ad in months

[@kali6651]

Download KZbin Vanced.

[@Alph92]

I really like this style where you explain things in a serious manner without goofing around

[@inspector13jjf]

That car in the beginning sounded like a little kid raging on COD.

[@MyNameIsNidos]

Literally the essence of classic MW2 lobbies

[@Sahidable]

Holy shit the accuracy 😂😂😂😭

[@davidmesraje1695]

Like I’m pretty sure all the donut media commenters recognize these same spam post lol

[@davidmesraje1695]

We all know your spam just stop 😂

[@Marsonpika]

Facts

[@Ashchu117]

okay so basically what you're telling me is that I need a rotary

[@weekendwrench]

They max at 20k rpm too 🙄

[@jacobwebb8818]

@@weekendwrench if a rotary were to hit 20,000 rpm the rotors would only see 6,666.67 RPM because the eccentric shaft is what is counted as a revolution from a rotary, the eccentric shaft spins at 3× the rate of the rotors

[@DatDarkOne]

I was waiting on this reply as I was saying the same thing.

[@CrypticApathy]

You would be hard pressed to do it. They wouldnt have to worry about the first 2 issues. But they would about the 3rd issue. You would spin faster then the fuel could be ignited. They already have a problem with having unspent fuel stock. Making them spin faster would only make it worse. You would more then likly just flood the engine at higher rpms.

[@MazdaRX7007]

A turbine engine would be the perfect rotary in this case.

[@daviluluwinner1823]

Simple answer: combustion engines can only go a certain amount of vroom.

[@lucasmason2256]

Good try

[@wolfiethesniper5403]

AKA overr 600 mph

[@ericpe2325]

L

[@b1tb0mber]

haha combustion engine go brrrr (but only so much)

[@michaelshive6748]

If I'm not mistaken, the 2.4L V-8 of F1 from 2006 to 2013 revved up to 22,000 rpm

[@MDDeGrande1994]

Not only the V8s but also the V10 from the 2004 BAR Honda 006.

[@tiagofigueiredo2529]

Honda RC115 reved up to 22.500rpm

[@alecjones4135]

Only reason why I watched the video was to see if he mentioned those F1 engines

[@canadianwelder3899]

Think Cosworth did it first

[@AnIdiotAboard_]

They never reved that high at a GP Event, the FIA got wind 22,000 RPM Honda engine with significant performance upgrades, a 19,500 rpm limit was enforced after pre-season, later reduced to 19,000 rpm because teams decided using beryllium was not a good idea but a bad idea. Even though 20,000 is an arbitrary figure were not limited there, and there are plenty of engines that will scream well north of 25,000 rpm.

[@magnumowner]

What i learned from this video is that actually the most limiting factor is money lmao

[@LunarStrike]

That would be the limiting factor to almost anything

[@Popsicle_MP]

that is by far the most accurate explanation

[@Si74l0rd]

Yeah, we all need Konigsegg free valves in our engines. Simple!

[@Si74l0rd]

@Enrique Rojo Jorge If you can't keep your data safe from 'em, might as well join 'em ;)

[@silverliteway]

Yes money let f1 rev up there and the teams planned higher...damn regs!

[@therealsnoop7497]

This show needs to be renamed to science garage Edit: for those of you saying, “NO!! The show isn’t the same without Bart!” In my opinion Jeremiah is still entertaining and knows about the stuff he’s talking about. He talks about how cars relate to science, just like how science garage did. The show is a lot more like science garage than bumper to bumper. Early b2b episodes featured James, and even Nolan and Jeremiah reviewing super cool cars. This is a lot different from old b2b, and a lot more like science garage. Even this specific video they did a science experiment, again just like science garage.

[@cpscps2679]

Sounds familiar...I miss that guy.

[@ultraguy8771]

@@cpscps2679 Whatever happened to him? I know he left because he had a kid, but he seems to have vanished off the face of the earth.

[@jasonander4964]

@@ultraguy8771 he’s on Instagram, @bidsbarto, and as far as I know, he’s left donut completely behind, not making any posts relating to them (again, as far as I know).

[@ElZamo92]

No. this dude looks like he knows nothing about whats hes talking about. Much unlike science garage.

[@rootaficationism]

You're way off dude!

[@jim.659]

that one civic at 3am: is this a challenge?

[@thor6264]

Civic makes at least 1,000,000,000,000,00 RPM

[@andy56duky]

@@thor6264 or make those ricers make a fartcan revving to 5000 rpm saying" its over 9000" like an idiot.

[@darkknight097]

@@andy56duky I get the first guy's joke but yours doesn't make any sense. A k20 civic can rev to 8-9k pretty easily

[@phatpun9545]

This is a premium high school Presentation. Top notch. Very informative. 💯

[@Niugnep]

“You’re a trade-off. You’re parents traded off having a fun life for, ...” I feel attacked, but it’s too funny. Love you and the donut crew!

[@zerobatsu]

I love how it just cuts off before he digs deeper.

[@Jonnyg325]

We demand 2 apologies, 1 for the insult, and one for an extremely tortured metaphor

[@TheWinjin]

Also the editor poking fun at him with subtitles

[@TypicalGoosie]

“It isn’t physics is Mother Nature” goes on to discuss physics.

[@heygek2769]

talking about the previous video on top speed, the problem wasn't physics, it was geography

[@abstract0407]

Really weird and random physics

[@buttsexandbananapeels]

Yeah, it was a weak sauce intro.

[@Dug6666666]

HRC Honda, hold my beer. Small capacity RC 2 stroke engines around 40K rpm

[@thiago4santos]

Physics studies nature, so is accurate.

[@catalystkitty]

MC22 CBR250RR: 4 cyl 4 stroke, rev bouncing above 20K RPM daily since the early 90's and still going hard

[@johnamador887]

My first thought.

[@Aduro90]

My first bike 😍

[@FirstLast-tx3yj]

You had it for how long??

[@ralphm4132]

yeah my workmate had a CBR 400 that went to 18 easy, while my FZR 400 only went to 15. We'd drag off the lights every day after work, good times.

[@Emfourayone]

17.8k actually tach was inaccurate cdi would only provide enough spark for that

[@noahdavidson7008]

“Impossible to rev over 20,000 rpm” runaway diesel: hold my beer

[@iPossum452]

I love the newer direction that B2B has taken. It’s a really good continuation of what Science Garage used to be. Thanks Donut (:

[@JohnnieFruits]

I'm really surprised that Jeremiah, the motorcycle guy, didn't mention Ducati's desmodromic valve system

[@srgbobbert]

Glad I'm not the only one

[@tartarosnemesis6227]

Desmodromics for the win!

[@andrewpalmer859]

Or the old cbr250rr 4 cylinder bikes... 20k redline and for public roads!

[@syoukhan]

yeah beat me to it. I'm here in Italy furiously gesticulating at my laptop. This is unacceptable

[@LegendGD123]

wait, didn't he mention that in a different video though?

[@tubastud06]

"Isn't limited by physics, but rather by mother nature" - That's... That's literally the *same* thing

[@heygek2769]

Nope, the problem was geography, not physics

[@carlosverdugo9684]

I dont think a plant is physics...

[@Ryan.......]

@@carlosverdugo9684 Every aspect of nature boils down to physics.

[@ulifehr5357]

What I THINK he meant "THINK", is how the fuel couldn't really catch up with the piston, so I mean yea it's a form of physics, but how rapidly do you think a gas could expand and ignite 🤔 maybe we need some new fuel? 2 Stokes don't use valves so problem 1 solved, but what's next? A super high pressure injector thatll help thrust a piston downward+ the fuel ignition? Idk we'll have to start making blue prints of the best possible design in engine motion

[@jaykoerner]

@@ulifehr5357 I think your talking about a wankel engine.... Fixes the majority of those a issues

[@agentlongwood]

In the section on valve float, I'm surprised yall didn't mention the system Ducati uses. Desmodromic valves have a thing like a rocker to open the valve, but no spring to close it. Instead there is another rocker looking thing that forces the valve closed, which is also run off of lobes on the camshaft.

[@littleshopofelectrons4014]

True enough but today's valve spring technology allows the engine to rev just as high without the complex desmo system. Even Ducati is phasing it out.

[@charlespletzke8311]

Rotaries: haha dorito go burrrrrrrrrr at all the rpm

[@willadams5758]

Came to say the same LOL - I love my 82 GSL

[@aestheticswim3397]

better have a closet full of apex seals

[@liamwagner9160]

I was wondering why it wasn’t mentioned🤔

[@charlespletzke8311]

@@aestheticswim3397 an entire room in a house just filled with apex seals. Can’t carry any cargo, all the space is taken up by spare apex seals

[@brokeandtired]

Rotaries still have the flame front issues....So even they are limited...(And before someone says it...I know. R/whoosh....I know its a joke).

[@maschan91]

*valve floats* Ducati: Hold my desmosedici.

[@MortimerJones99]

I'm curious why he didn't mention Ducati during that segment

[@yuuji_]

90's japaneses 250cc sportbikes toping out at 19k rpm : "i am speed"

[@manman-sg1zt]

130W dremel maxing out at 33 000 rpm...it do be like that though.

[@mikekopisz1227]

Dude,The nitro engine in my track car (in thumbnail) runs @ a consistent 42,000 rpms and fits in the palm of your hand

[@braydenwildey3366]

Nitro Radio Control engines can rev all the way up to 50,000+ rpm!! You are right!! I have a Traxxas revo 3.3 and that bad boy peaks horsepower at around 30K. People need to be informed about these engines!!

[@bmxscape]

@_. this is a direct quote from the guy in the video: "the fastest revving motor peaks at around 20,000 rpm" he didn't say anything about the size or type of engine, just that it is a "motor". by definition he's wrong lol

[@IKATEN501]

"Make sure you rev it up to 11'000 rpm" -Bunta Fujiwara

[@Alvon_PR]

-Turn on Light's -Tachometer : 12100 RPM -Takumi : Oh Sh*t

[@matthew_natividad]

*Sound files rage intensifies*

[@ryanm2700]

“You’re a trade off!” may be the best insult ever 🤣

[@jakemauger8377]

1/8 scale R/C car engines regularly turn 35-40k rpm. The really high end ones can sometimes reach 50-60k.

[@edblock8117]

I think most of these are 2 stroke

[@oscarsomers8597]

2:30 in 2 sec this guy taught me what 15 min videos couldn't

[@TheGardeinator]

"The piston, it could hit that valve - it's called crap day"

[@juliocabrera5842]

I was thinking he was gonna say a profesional name for this 😂

[@3.9L_V8]

Speaking on valves, there's also desmodromic valvetrains in which there is a seperate cam for opening and closing the valve, eliminating the need for a spring. Although they eliminate valve float in the traditional sense, they are more complex and more expensive. I think some old Merc racing cars used them, and Ducati is known for their Desmo engines

[@TheCabbageMan]

"Turns out top car speed is not governed by physics but by mother nature" sooooo... physics

[@bricefleckenstein9666]

And that top speed keeps getting pushed higher every so often. "waves at Thrust SSC"

[@andreichichak5242]

Yeah, I always thought that physics described nature, but I guess Donuts describe nature.

[@thegreatafrican3367]

That was just a dumb statement

[@matthagge4792]

You forgot Ducati desmodromic valves! I know bikes aren't the focus of this channel but it's another very interesting way of controlling valve float.

[@FaaaaapMaster]

0:22 Of course I needed to hear that engine on MAX VOLUME!

[@ElliWoelfin]

That was fucking painful.

[@DroopyLoops]

Y'all auto color correct got my boy looking like he's got on Coral #4💄🙏😂😂😂

[@Keegsbruh413]

Dont mind me. Just impatiently waiting for this week's money pit

[@carsonmeyer1677]

What happened to their schedule?

[@Sam-rk6lq]

Rip

[@vincentasher9903]

C’mon with the money pit!

[@NomadJedi]

No money pit this week or the next. They're on vacation.

[@davidvalderrama1816]

Sir, I assemble engines for a living, 15+years, and your presentation and explanation was excellent. Thank you

[@thegreasybandit6373]

Me: What it's over already? KZbin time bar: It's been 11 minutes Me: Man, time flys.

[@puffyg2050]

0:42 flashbacks to 2017-2018 science garage

[@ankursagale]

Takumi: So I started revving anyway......

[@crossmeister]

"You're a trade-off, okay?" with finger pistols is my favorite Jeremiah wallpaper now.

[@DrDrift-rl6cc]

That was a pretty savage roast at the end

[@mfnafi5]

Me: *gets a youtube premium trial to skip all the ads* Donut: Here's a 15 minute ad for mail pattern baldness.

[@krisscrossapplesauce6636]

At least the ads are quite entertaining

[@yaboianz]

@@krisscrossapplesauce6636 true i rarely skip them because donut is hella creative lmao

[@jarno3000]

Mail...

[@gabrielvieira6529]

pololol.

[@Applejack1396]

I was just thinking the same thing

[@markwerner7297]

I like how bumper to bumper just turned into science garage

[@929roger]

7:17 You forgot the desmodromic system, which basically opens and closes the valves mechanically. A system which Ducati stills using today

[@ardijanuar2036]

Still doesn't solve the reciprocating mass and flame speed problem. It's also more complicated and require more frequent and expensive maintenance, like every modern ducati did (except multistrada v4)

[@fred_e]

Came here to mention the desmodromic system as well

[@ArtoriusBravo]

@@ardijanuar2036 I dunno man, correct me if It's just a dealership thing but a friend of mine nearly swapped his 1200gs for a Multistrada but backed down when he researched that the 40000 km service had a bill of around 2000usd.

[@929roger]

@@ardijanuar2036 at least valve floating is solved 😂

[@PhilipBeresford]

I came here to say this, but then I remembered that desmo Ducati's don't rev past about 12k rpm anyway

[@kmonkey4138]

I wonder what the RPM limits of a rotary engine are. Would be interesting to see how much force an eccentric shaft could handle from the rotational force of multiple rotors

[@christopherpape4823]

I was just thinking that it seems like something like a rotary engine would possibly provide somewhat of a solution for the first problem 🤔

[@bruhnt5063]

Day 82 of wanting Up To Speed back

[@Didnt_ask69]

Virgin

[@MattDTB]

We need up to speed

[@machinis]

@@Didnt_ask69 lol!

[@ereder1476]

to be honest i subscribed for up to speed and that big beared dude... I'll probably unsubscribe if it doesn't come back

[@aneudysc]

@@Didnt_ask69 Virgin't

[@dh66]

I've got a motorcycle from the '80's that has a 19,000 RPM redline.

[@Rotorr]

mc19?

[@dh66]

@@Rotorr FZR 250R

[@A500-g6g]

I really really want one of those. Some modern tyres and suspension etc would make that an absolute hoot to ride. Must sound like nothing else on a flyby.

[@fokiralomgir2563]

@@Rotorr had one of those. The sound coming from one of those was pure joy

[@Rotorr]

@@fokiralomgir2563 im currently rebuilding my mc22 for track use. If it wasn't as light and fun to ride i wouldn't have bothered. A simple twist of the wrist will bring a smile ear to ear.

[@Yes-qj4bi]

3:15 thought I was on the wrong website.

[@parke4112]

My dad is a mechanic and I know nothing about engines, I'm a musician, however, I really enjoy your content guys, love u

[@rickyrotarys1501]

Rotary engine: excuse me what about dorito engines

[@damirock98]

Username checks out

[@denzelherrman]

Piston:vroom croom braap braap Dorito:PUTA PUTA PUTA PUTA PAAAT PAAT

[@scottmcqueen3964]

Dorito's are even worse then pistons engines lol A typical sized rotary at 20000rpm would have a tip velocity of 900km/h. Its kind of hard for combustion to keep up with that haha. Not to mention all the other issues this causes.

[@mrtechnical4]

I feel like you guys missed an entire section of piston engines that DO cycle consistently faster than 20,000 rpm. Nitro-Methane RC engines will spin at 30,000 rpm all day long and some will go higher than that into the 40,000 rpm range. Granted those engines use top fuel and also don't work if scaled up to actual car sizes, but they do exist. Obviously the valvetrain issue is solved by the engine being 2 stroke and the oscillating mass is taken care of by the high relative strength of the titanium they use combined with their low mass. It does leave me wondering how fast the flame propagation is using nitro-methanol if it can rev that high with no issues.

[@megimargareth4015]

Small cc engine means small space the fuel needs to burn to the edge, lol Thus the flame propagation in this case is on different level with a full size car, lol

[@heygek2769]

you answered your own question, the problem there is scaling, the movement of the cylinders is linear, which would scale linearly, but volume and mass don't scale linearly. this is also why airplanes can't just be scaled up or down with the exact same design.

[@RandoTark]

Regardless, every time I hear one of them or run my own ... Im always amazed the engine internals stay together at those speeds and last as long as they do ... its quite nutty.

[@derekmaxwell8164]

The old 1.5 litter F1 engines use to spin like 22k before they started making rpm limits to lower power

[@derekmaxwell8164]

@Hasi Mausi plenty? What like a 50cc motorcycle? Cause even the old high revving 250cc crotch rockets usually only turned 15-19k at most

[@jakeclement5785]

Many people 100 years ago, or even 50 years ago, believed it was “impossible” to have what FaceTime is today

[@tihs87]

yeah and many people over 2000 years ago belived you can't boil water in 80 degrees C. Lets wait another 2000 before pulling out any conclusions.

[@SRNikoSR]

The temperature water boils also depends on the atmospheric pressure surrounding it. therefore it is possible to boil water at 80 degrees C

[@tihs87]

@@SRNikoSRwas wondering if I should add 'at sea level' or have some fun the next day after, so here we go so that was an example of a fact not changing no matter how many years pass, if we add same pressure to the equation now and 2k years ago experiment would go exactly the same, so i removed pressure from the equation. moreover many means not all, so i'm sure there were some who anticipated pressure influence and to top that off thermometer was invented like 200 years ago, so ancients had some idea what's cold and what hot not a clue about 80 or 100 degrees so go back to school and eat your arrogance you dumb fuck. yeah that was fun.

[@matthew4107]

@@tihs87 i never knew Celsius was around 2000 years ago !!!!

[@tihs87]

​@@matthew4107 another smartass came around only a month later read the long comment above then try again.

[@austinsmith9413]

"no engine can rev over 20k" Me: drives old rc car with engine that revs to 50k rpm.

[@jimbob9328]

Was looking for a comment about nitros

[@zachr5676]

I was hoping to see a comment on rc nitro rc engines. I get that there is next to no mass compared to an automotive engine but it still is proof that it is possible

[@neilmowles7964]

@@zachr5676 two stroke rather than four stroke aswell

[@nemanja6037]

donut start drinking Nos: heartattack donut start putting chemicals on head: They buy Yugo

[@Lifesabishi]

7:18 Jeremiah "yeah so it's expensive" Wesley Kagan with his free valve Miata and designs he ACTUALLY released for free: "am I a joke to you?"

[@matismiki]

“Impossible to reach 20k rpm” Rotary: are you challenging me?

[@alexandersmith7777]

Yes

[@giancarlolugo9586]

@@alexandersmith7777 what about Yamaha Honda Suzuki Kawasaki old bikes with 800cc-1200cc engines

[@GarageSupra]

video is about piston engines

[@giancarlolugo9586]

@@GarageSupra well I heard those old Hondas S800's could rev to 15K-18K RPM because those roadsters had bike engines

[@yusufkuntoro3141]

Rotary engine has big flame propagation

[@alexstasko696]

20k rpm with this many moving parts is truly incredible

[@randomotter6346]

Turbine engines: Whomst has summoned the ancient one

[@v4skunk739]

Are you dumb? There are no cars with a turbine.

[@MrPruske]

@@v4skunk739 jay leno disagrees

[@v4skunk739]

@@MrPruske Wow sorry there are like 5 cars built since the 50's and every single one of them was a complete disaster.

[@rj6110]

@@v4skunk739 5 > 0

[@MrPruske]

@@v4skunk739 np. It is very few. I think the turbine motorcycle is even sillier.

[@chocolateman120]

That uno, dos, tres straight into the ad was right on time lol

[@coolabhisankar]

I was literally looking for this comment 😂

[@iwantsexseemyvideo2929]

♥️🙃😄

[@lordvader3283]

Old 2 stroke Detroit cold start run away enters chat.

[@isthatasupra9569]

That like 30000 rpm lol

[@nathanramos9675]

As a rotary boi, I was sad to hear this knowledge bomb doesn’t include us

[@gamechip06]

Ok I regret skipping the entire keeps ad and hearing "I'd look good in a bikini" without context

[@DIE_WIAAN]

@@iwantsexseemyvideo2929 Wtf is is with these bots

[@aperson6863]

@@DIE_WIAAN the owners/people who pay for these bots think that since we like cars, were all a bunch of rich and _horni_ grimy old men when in reality, were either young adults, or literal children... And some of us aren't even dudes. Edit: also sometimes you can get reported for explicit language for @ing some of these bots, like the one you @ed.

[@Tacko14]

@@aperson6863 and there’s the vid going on about suck/squeeze/ah... bang/blow. Life’s not fair

[@TheIcyWulf]

You should.

[@theuncanspan]

i like how this guy exlains, it's like your best friend in kindergarten talking.

[@whateverprecisely]

truest thing I've heard today

[@Paios]

is Jeremy wearing lipstick? or a light foundation? he's absolutely glowing today

[@how57]

You are the most chilled out donut media guy

[@uranumbnuts]

"No engine can rev above 20k" allow me to introduce you to my uncle's 87 RX-7....

[@therealracer135]

Video link?

[@uranumbnuts]

@@therealracer135 lol. There is no link. It's a joke on how ppl say rotary's don't have a rev limit.

[@NovaZocket52]

@@uranumbnuts say hello to the apex seals

[@jaxemin]

@@NovaZocket52 goodbye*

[@ottoolsen9676]

yes but it has no pistons, wankel engines has a ton of diffrent problems, but it for sure can rev higher then a piston engine. even Mazda seems to have given up on it now. rc jet engine runns at 120000 rpm so engines can run faster still a diffrent kind of engine.

[@AJKecsk]

11:00 fellas, that's some of the finest chirping I've ever received.

[@smukii]

You look like the android from Detroit: Become Human

[@DerpyAngel09]

he actually looks a little like Connor's VA a bit too, Brian Deckhart.

[@99toyotacorolla]

_28 STAB WOUNDS_

[@gamerendar8756]

i thought the same when I ssw him

[@KeeperOfTheSevenKeys.]

And now we have electric cars on the consumer market with motors which can spin at over 20k RPM.

[@nolesy34]

Is all the fast they go? 20km? My gasoline powered pushrod v8 can go 120 baby!

[@Stellar-Cowboy]

Donut: No engine can go above 20K RPM F1 V10: Am I a joke to you? edit: dont be mad i know they said it in the video

[@TheSERGGIOG12]

Juan Montoya BMW rpm record

[@trashbandit2449]

They said "almost impossible" not that it completely cant

[@k4ZE106]

Well, yeah, but they also wouldn't last much longer than race distance.

[@ryanwhitlock7350]

Cosworth hit 20k in 2006 with their engine. Renault apparently hit 20,500. They didn't really exceed it.

[@ardijanuar2036]

Are you watching the video at all? They clearly mentioned renault v10 that can rev to record 20,5 k rpm.

[@tylerbendis]

Is it just me or does Jerry sound kinda sad throughout this video? Hopefully it's nothing but we love you bro, hope all is well ❤

[@TheFatSnorlax]

‘Laughs in 90’s 250 4 cylinder sportbikes’

[@botyaay1233]

Cbr250rr engine go reeEEEEEEEEEEEEEEEEEEEE

[@r3v1v3r4]

10:00 come one dude, that’s above average

[@drift_boi2843]

Jerry: talks about how expensive koenigsegg free valve technology is Me: a guy has done it to a miata wtf

[@tommyjay4770]

This is exactly why I’m happy to have a short stroke, helps my heavy bottom end last longer.

[@Rch_P]

The only thing I kept getting from this video is: Money is the true limiting factor

[@juggl5720]

i mean he said that engines which rev up to 20k, idle at 5k. Imagine normal ass street cars driving around at like 7k rpms

[@Brisk999]

civic owner: *see’s title* also civic owner: “are you challenging me?”

[@Levi-ud2wj]

underrated

[@Brisk999]

@@Levi-ud2wj ik man. i guess people dont like good comments anymore 😂

[@snips7653]

Meanwhile Chrysler turbine car *redlines at 60.000 rpm*

[@Chewwish7676]

ha

[@itachiushia706]

I mean its slow for an turbine

[@Chewwish7676]

@@itachiushia706 500,000 rpm turbine

[@purabus5450]

Do an 'Up To Speed' on the 'Honda Grom'.

[@theronquiett7251]

YESSSSSSSS

[@J5L5M6]

I don't know the Grom, but I would love to know more about the Honda Duelnote concept.

[@alexandersmith7777]

What's that

[@purabus5450]

@@alexandersmith7777 It's a very fun mini motor cycle which falls in the category of a 'Monkey Bike'. Just like any other Honda car or motorcycle they are really fun to drive/ride, very reliable, low cost maintenance, have amazing fuel efficiency and the beat part are insanely modable.

[@alexandersmith7777]

@@purabus5450 thanks That sounds like a great idea for an up to speed

[@yatinkumar8377]

Takumi: “are you challenging me ?”

[@straightbusta2609]

*proceeds to blow up the engine* TWICE

[@BoldRam]

12a Rotary has been bench exploded at just over 33,000rpm. Different type of engine but sill pretty bloody impressive.

[@WhatheEFF]

I love how he just faded out of the shot just like James' dad

[@PaganiGaming]

Day 319 of asking James to do an Up to speed on his Dad

[@mclarenspeedtail8988]

u didn't got that much likes yesterday pagnai. WHERE"S THE FBI

[@god.mp4]

he's back.... once again

[@mattcaldwell864]

Almost there

[@tungabunga4107]

13th like and 4th comment

[@mclarenspeedtail8988]

i heard people in the comments exposing pagnaigaming on instagram and youtube.

[@stoneykeviin4185]

Why It's Almost Impossible For An Engine To Rev Over 20,000 RPM Laugh´s in Two Stroke/ Rotary engines

[@joshuahite4360]

Two-stroke engines are limited by the same physics as four-stroke engines (minus valve float), and rotary engines aren’t reciprocal engines.

[@sharvapotdar3257]

@@joshuahite4360 does the title say reciprocating engines? If not, I don't see how he's wrong on that front.

[@bonovoxel7527]

@@sharvapotdar3257 Damn dudes, it's a title, he can't go 10 thousands caps for you. Just watch the video and he clarifies "reciprocating" at least 2 times in the first 3 minutes. You engineers of my balls.

[@AugustoEguiguren]

@@joshuahite4360 he is reffering to 2 stroke rotary VALVE engines, not WANKEL rotary engines, I race two stroke karts and they reach 21.000 rpm

[@bradywilliams2951]

@@bonovoxel7527 THANK you.

[@shackman1306]

Thank you again. Never stop learning.