How Do Some Engines Rev To 9,000 RPM?

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Why can some engine rev high and other cannot?

The Honda S2000, the Mazda RX-8, the Ferrari 458, the Porsche GT3. What all of these cars have in common is that in stock form they'll rev all the way to 9,000 RPM, if not faster. But what allows for an engine to rev to such high speeds, and why can't all engines rev this high?

This video will address five questions and subjects:
1. What is the purpose of a high revving engine?
2. How do piston speeds relate to engine speeds?
3. How does reciprocating mass play a role in engine speeds?
4. How do cars maintain flat torque curves and proper airflow at high rpm?
5. Are there disadvantages to a low revving engine?

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I love a high revving engine. Used to own a Mitsubishi Mivec from the 90's that revved up to 9200rpm and boy, the joy you get from the pull & the sound

heesingsia
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Youre one of the reasons i chose to go the engineering route in school. Being able to know so much, explain and understand all the math behind a subject and how it works is just awesome

squigga
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Ok so no script or index cards or nothin? You just walk/drive around with all this knowledge on tap? God dammit Jason! How can I give you my money? Are you still selling merch?

ElSikario
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Best professor I've ever had and I didn't even have to take out a loan to get you!

jmannUSMC
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To add to the conversation. Usually one of the first components to fail when over revving a piston engine are the rod bolts due to the mass of the pistons/rods. Connecting rod bolts will stretch under extreme stress, thus causing bearings to unseat and spin inside the rod journal housing. I've encountered this once lol.

LikeZO
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I love how I don't have a car but I watch each one of Jason's videos because he creates such fun and educational videos.

turannaimey
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Watching these videos is time well spent

BhavinTolia
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Bro ... I have a rotary in my garage right now that makes its peak horsepower at 17, 000 RPM, I was like what the heck!!!

WarpedYT
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I really enjoy your videos. I have learned a lot and even though sometimes I have no idea what you're talking about I still leave feeling like learned something. One of the best YouTubers without a doubt. Thank you and please keep posting!

ChristopherHepner
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Somewhat related, I love how you’re covering both Gasoline and Electric engines on this channel. Really helps when we are seeing both in the mainstream right now.

uss_
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With VTEC which includes 1000 magical unicorns farting at once - MOOG

NishantDash
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Experiencing the 9000 RPM redline of a GT3 is something magical!

ShakaLakaMTB
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IMO, one of the best YouTubers around

_BangDroid_
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I miss my '01 S2000. Traded it in for a 2010 CR-V when my wife and I decided to start a family. Some day I'll get it back. There is nothing like the screaming power when VTEC kicks in and the RPMs shoot up to 9000. A spirited drive along a windy road with the top down = pure bliss.

Samuel-kmyf
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Takumi's Trueno was able to rev to 11, 000 rpm

itzzkittens
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I love your videos, they take me from being ricer to racer 😂

SULX
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Another great video! Big shout out to the Mazda RX8 Renesis engine! A dyno chart for that engine will show that peak power comes at its 9k rpm redline which implies that if Mazda designed it to rev higher, it would continue to make more power. The cool thing about the rotary is that it isnt bound by a cylinder head. The manual version of the car comes with an engine with 6 total intake ports vs 4 found in the automatic trans equipped models. The 237hp 6 port engine revs to 9000 rpm (possible partly bc of those 2 extra intake ports) while the 4 port version only revs to 7500rpm and makes 191hp.

waydigga
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"So what makes it possible?" "Well, first thing i want to talk about is geometry...." oh yeah this is Engineering Explained all right XD

emanueladamache
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I think Honda did what they could to take after DBZ. “ITS OVER 9, 0000!”
They’ve been memeing since 1999 👌🏼

lukasrosa
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Every video that you upload - is freaking awesome !!!

g_mb
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