Why don't they make any car engines that rev high?
Why don't they make any car engines that rev high?
Chase Allen
Grayson Baker
James Ross
Do we have to have this thread every couple days?
Stop being dumb
Hunter James
he thinks its the same person asking the same question over and over
dude there are millions of people on this planet
people will always ask these same dumb basic questions forever
Brody Torres
ok, so why don't they just put two motorcycle engines in place of a car engine. now you have sufficient torque, above average hp, and a 20k red line. what is so difficult about this
Austin Scott
because there's no point. why rev to the moon and guzzle fuel when you can just gear your way to victory?
Matthew Nelson
Their tiny displacements means engineering it to rev high is cheaper.
That and if you put that engine in a car you will bend a rod in half just trying to get it moving from a stop, unless its in a caterham and uses a really tall gearbox
Owen Murphy
>sufficient torque
no they don't.
I love high revving motors more than most but small capacity high revving engines don't make enough low rev torque to effectively make enough torque for cars because they make power at high revs. An engine that could do both would be insanely complicated if it was NA
If you went with a VVT that could change the lift dramatically and only open one valve at low revs plus an intake with reallllllllllly long runners switchable to ultra short runners it might be possible.
Camless might make it possible.
Carson Collins
The piston has to come to a complete stop when it gets to the top and bottom of the stroke. That means all the mass of of the piston works against it when changing direction.
Thus, the smaller the mass of the piston, the easier it changes direction and the faster it can rev.
This is why rotaries can rev hard, because the dotito is always spinning in the same direction.
Adrian Lee
They do, you have to go to niche places for them though
>speedhunters.com
Nolan Richardson
Im pretty sure there are camless engines like that. But not in street cars. Too much weight and size for a traditional bay.
Henry Smith
I'm talking more koenigsegg freevalve style. complete control over each individual valve down to the smallest measurements. when that tech becomes viable for production then we may see very small, high revving engine made for road cars
Owen Allen
Making an normal sized engine rev that high RELIABLY enough for a road car is not feasible.
Not to mention the complete lack of torque at low rpm that comes from a high revving engine would make driveability complete shit and having to rev it to eleventy billion rpm just to potter around would be annoying as hell.
Tl;dr no
Charles Morgan
They do.
Honda s2000 revs to 9k
Honda s600 revs to 10K
Bentley Anderson
idle quality
cam timing
David Gray
I think there is some physical limit, relating between the travel of the piston and it's weight, and RPM.
So with our current understanding of metals, you can only do so much. Want big displacement, then you can only build something that goes to such an RPM and has xyz piston travel
Joseph Robinson
>10k
>OP revs to 19k
Yeah totally the same
More like piston speed and valve float
Noah Diaz
Dude my engine sounds like it's going to explode at 4k rpm. 18k rpm and the whole city will hear it.
Kayden Baker
Lucas Williams
Generally valve float becomes a concern way before the acceleration of a piston becomes too much for it to handle. But still the same principle applies: bigger valves float a lot earlier.
Connor Green
We're not talking about bike engines were talking about car engines
Idiot.
Colton Peterson
But he's asking why don't any rev as high as that bike (19k). 9/10k is a long way off 19k you dumb cunt
Ryder Mitchell
user comes through with the answer.
It's why little RC engines can rev to like 50 000 crazy shit like that. And why big engines that rev high cost so much. Exotic lightweight yet strong materials are needed to pull this off
Ethan Ramirez
No he just asked why don't they make high revving car engines.
In no way did he say if the engine had to be related to a bike or pic related.
Sucks to suck huh?
Bentley Mitchell
>make power at high revs
yeah, that is the point......
Jacob Garcia
We are talking about why car engines don't rev as high as motorcycle engines.
Those car engines don't rev as high as motorcycle engines
Joseph Gomez
He also didn't say 10k was acceptable.
Andrew Reyes
Because high rpm is a meme
Robert Brown
The ilerminati has been struggling the keep high revving engines down for some time now. It's feared the public, when given the high revving engine option, will quit their jobs and spend the remainder of their short-lived lives hooning around in these addictive rev machines ripping hektic skids until they inevitably crash n die. Obviously this will substantially cut tax revenues. its a good thing when you thing about it. joos are protecting us from our own revs.
Jack Morales
Why did they use a different tool box in the comparison?
Levi Williams
what comparison?
Jeremiah Mitchell
To be fair, there are quite a few bikes that don't rev higher than say, a corolla. Yamaha MT01 for example. The issue is bore vs stroke, pistons of certain alloys don't like to be accelerated that fast. 3x larger and it has to travel 3x longer.
Ayden Moore
>3x versus MC21
Mason Hill
RIP
Easton Smith
>low revs plus an intake with reallllllllllly long runners switchable to ultra short runners
HONDA, FUCKING MAKE THIS
Samuel Ward
What makes those two toolboxes look different to you
Christopher Anderson
>that motorcycle
ENTIRE TACHOMETER IS RED ZONE
DO NOT REV ABOVE 0
Dominic Baker
what bike is this
Julian Garcia
CBR250RR
Pretty rare and not fast
Angel Cook
OMG so there is a replacement for displacement...
Liam Thompson
Honda CBR250RR MC22.
Fairly rare unless you live in Australia or Japan. One of the best, if not the best four stroke 250cc road bikes out there.
They make between 40 and 45hp, depending on the year and are surprisingly reliable, considering what they are and the hard life almost all of them lead.
Eli Nguyen
Liam Gonzalez
The 13b renesis reved upt o 9500 stock, the 4A-GE 20V reved close to that to.
But 19000 rpm is extreme, even for a motorcycle, Kreidler made a world record bike some decades ago it reved to 15000 rpm and made 15 hp out of 50ccm, they got 225km/h out of it.
Robert Miller
>The 13b renesis reved upt o 9500 stock
No it didn't.
>the 4A-GE 20V reved close to that to.
No it didn't.
Christopher Young
pretty common in england too, but most of us would rather have a rgv250 or an rs 250, for pretty much double the hp and dat smell
Jaxson Wood
Ok, the 170kw 13b renesis does "only" rev to 9000 rpm
de.wikipedia.org
I can´t find the rpm limit of the 4A-GE blacktop at the momen´t, but its maximum power is at 7800 rpm, so it will rev over 8000.
Gabriel Reyes
>so it will rev over 8000.
Redline was 8k and limiter was at 8.2k. That's nowhere near your claimed "close to 9.5k".