If an engine is firing at 18,000rpm, does this mean each piston

Yes, each piston is completing one traversal up and down the the cylinder for every rotation (of the crankshaft) per minute. No division required.

Yes, that's how they keep the feet per minute down.
Any piston travelling over 4500 fpm is pushing it.

>>17157510
So at 18,000 rpm every cylinder fires 150 times per second? Isn't that an absolutely insane frequency? How is it even possible for a cylinder to complete an entire four stroke cycle in 6.7 milliseconds? And if you have a six cylinder engine it's one cylinder firing nearly every millisecond? This can't be right.

>>17157499
Nigga are you stupid? 18k RPM is the speed of the crankshaft turning.

>>17157528
That's how it works, although 18k rpm is a very very high number only really seen in crazy race car engines and some motorcycle engines.

>>17157544
Yeah I know, but the firing frequency would be the same for a 9,000 rpm V12. And a firing every two milliseconds like in a 4,500 rpm V12 or 6,750 rpm V8 would still be insanely high speed.

Hell, even my diesel fourbanger theoretically fires every ten milliseconds cruising at 3,000 rpm. That's quicker than the refresh rate of my computer monitor, and I consider my computer monitor fluid.

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>>17157541
Then what are the pistons doing when in a V10 formation?

>>17157528

You are still trying to find some way to factor in the number of cylinders and the RPMs. There is no relationship between the two, just drop that thought from your head.

Let's take a straight-6 engine hitting redline at 7k RPMs.

The crankshaft is rotating 7000 times a minute, meaning each piston is also moving up and down (1 rotation), 7000 times per minute as well.

7000/minute = 7000/60 seconds = 116 rotations per second, half of which are exhaust strokes, so the cylinder is firing 58 times per second at redline.

So is every other cylinder, too, just at different times.

>>17157633
But that's exactly what I was saying. One cylinder fires 58 times per second at 7,000 rpm. Six cylinders together fire 348 times per second at 7,000 rpm.

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>18,000rpm
Jesus Christ, not even rotaries could go that high in a conventional car, dafuq do you drive as your daily?

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>>17157640
>projecting about your own mother this way

>>17157646
The example was from the V10 3.0 F1 engine by Renault.

Video related: https://www.youtube.com/watch?v=nX2L-kS7ZL8

>>17157644
which is why it's not good to constantly redline your car :^)

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>>17157646
Pic related

>>17157499
It takes two complete revolutions to fire every cylinder in a four stroke engine
RPM divided by 2 divided by number of cylinders = how many times a piston fires per minute

>>17157719
>divided by number of cylinders
Wait, what?

>>17157528
Yes it is extremely fast, but these engines are purposefully built to do it. Small number of cylinders, incredibly short stroke, lightweight rods and pistons and knife-edged crank shafts with special wind age trays. Sometimes they will even run multiple coil packs on one cylinder, and I think most of them use pneumatic valves now

>>17157753
>divided by number of cylinders
>equals how many times /an individual piston/ fires
Each piston only cycles once in a crank revolution

>>17157625
Fucking moving at whatever rate the math works out to for the crankshaft spinning at 18,000 rpm

>>17157762
But if every piston fires every two revolutions, then you don't have to divide by the number of cylinders.

>>17157779
If you wanted to calculate an individual cylinder you would, unless you wanted to count all of the detonations in 1 revolution? Am I missing something

>>17157779
>>17157762
Number of explosions a particular piston experiences in a four-stroke engine is RPM divided by two, because half the time there's a spark and the other half it's ejecting exhaust. So at 6k RPM any given piston is tanking 3k explosions per minute

>>17157808
Oh duh. Yep sorry I'm an idiot. Because they all fire anyway

>>17157657
watching that video makes me feel things

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>>17157833
No one has lost yet and neither has the White Race even begun to fully wake up yet -- that is on it's way. Leave your cucking for elsewhere, no one likes to see it. Boring as fuck.

>>17157834
It is something. It is what sparked my interest in what each piston achieves to maintain such power at high rates of combustion.

>>17157858
F1 engines have a tiny stroke, which keeps the piston speed down so it won't just fly apart.

>>17157867
F A K E
N
E
W
S

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>>17157862
I heard the pistons are thinner, but wider than normal pistons.

>>17157867
>i-it's over

Are you always this scared of White people? You're just another run of the mill faggot I see everyday who cannot see what is coming. Always remember where your enjoyment of cars comes from, Chang.

>>17157889
>I heard the pistons are thinner, but wider than normal pistons
Pretty much. Thin to keep weight down, and wide for a big bore size so there's still some displacement and area for valves.

>>17157719
No, it's just rpm divided by two. Forget the number of cylinders.

A piston in a 4 stroke engine fires every 2 revolutions of the crankshaft, regardless of how many pistons there are or how they are arranged.
At 18000RPM every piston will fire 150 times per second.

18000 / 2 = 9000 Ignitons per minute
9000 / 60 = 150 Ignitions per second

On a 2 stroke engine the revolutions equal the ignitions per minute.

>>17157913

>Minorities move in

>White "genocide"

Nobody is systematically murdering us in the streets or preventing us from reproducing. Take some responsibility for yourself, it's not society's fault you will never procreate or accomplish anything in your life.

>>17157528
the shorter the stroke, the easier it is to get high reepms
(not 100% true, but a great rule of thumb)
go look at bike engines.

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>>17157646
Not OP, but these go to 19,500rpm.

>>17157499
Rpm is measured off the camshafts dummy

>>17158911
you can tune em to go 20k+ with ease, right?
or is that just a myth?

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>>17157833
>white people objectively more successful than any other race
>responsible for literally every piece of modern technology
>give said technology freely to lesser races who haven't quite mastered the fine art of farming or boiling drinking water or any form of electricity.
>white supremacists BTFO by other whites, not nogs
>inferior races use freely given white technology to breed like rodents

"w-w-w-hite people BTFO l-lol!"

the last time whites got mad at a lesser, nonwhite race, we invented the field of nuclear science because conventional explosives just couldn't express our disgust efficiently enough. Don't get cocky.

>>17157754
Conventional valve springs aren't reliable past about 15k for engines that size, F1 hasn't used them in decades.

>>17158951
More of a myth, they're already at about the max RPM you can run them at reliably from the factory.

Kawasaki's ZXR250 was especially known for munching its valves at 21k rpm.

>>17159067
kay, thanks for clarification

>>17159067
https://www.youtube.com/watch?v=2lLXC2CSnQE
they sound godly though

ok higher the rev the more fun it is?

>>17159096
ehhhhh it all varies.
more revs make more power with the same torque if that torque peak is moved to a higher rpm.
each engine has its use, and high rev engines can be easily lugged. (not as in a good thing, but as in its easy to do)
high rev engines are usually preferred for racing applications though (even nascar has a 8.5k-9k rpm if im not mistaken)

>>17159096
Not really, lots of revs is just as fun as lots of torks in the right situation.

It's an apples and oranges scenario desu.

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>>17158911
>my dad's face when I explained these crazy bikes to him

honestly, the only Honda that is as wild is the Valkyrie Rune. its a crusier with a Goldwing engine in it.

>>17159000
>>white people objectively more successful than any other race
>>responsible for literally every piece of modern technology
tfw retards literally actually believe this. literally lmaoing @ u tbqh

>>17157662
pussy

>>17159062
Moto GP uses pneumatic valves. I assume thats what F1 uses?

>>17157528
>So at 18,000 rpm every cylinder fires 150 times per second?
That is different for different types of engines:
4-Stroke: 150/second
2-Stroke: 300/second
Rotary: 300/second
original Wankel engine: 900/second
turbine: continuus combustion

ICA karts from early 2000's and 1990's were doing 25,000 rpm

R/C nitro engines are 40,000+

>>17159253
Oh you're one of the WE WUZ KANGZ N SHIT AND WHITE PEOPLE STOLE IT

No, white people invented it, it's why Africa is still full of mud huts and savages

>>17159253
>>17159856
There are other races than white and black, the Japanese for example aren´t dumb either, while Aboos are even below regular niggers...

>>17159000
>we

Yeah, your contribution to the next generation of weapon system will be shitposting on 4chan's automotive board, huh?

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>>17158199
A genocide doesn't mean machete killing, you dumb fucking animal. It can constitute any means in which a certain demographic is REMOVED or pushed out of a habitat. How about you apply yourself before telling others to do the same, you fucking faggot?

>White population being outbred and positions of power lost
>it's okay guys just get a job XD

>>17159925
>Chang still shitposting in absolute fear
>c-cumskin

geg

RPM refers to the crankshaft. It doesn't matter what the pistons are doing.

>>17159882
>Japs were abbo-tier slant eyed savages
>barely able to make steel
>shitty bamboo armor and spears
>agrarian society, 0 industry
>admittedly pretty good at music and painting
>dickrode the British Empire hard and copied everything they could
>United States cock slapped nips and head slammed them like casey that fat kid
>after bombing their islands flat the US stuck around and rebuilt them as a western-style industrial nation
>nips still obsessed with the West, copied American industrial practices and office life and used their autistic asian monomania to take it to high level

Without whites, nips would be bamboo-clad savages even today. Stay mad

>>17157499
Prez/o/ put your trip back on you dumb fuck

>>17159925
>jews aren't white
>European jews have white/pink/pale skin
>live in white nations
>participate in white civilization
>speak white languages
>intermarry with other white ethnicities
>part of the judeo-christian intellectual heritage

j-jews! wh-whitey BTFO!

You Mongolians are all fucking retarded.