Thread 28659023

>>28659023 (OP)
>he cares about the cosmetics of brake rotors

>>28659028
/thread

>>28659028
>he's able to see his brake rotors

>>28659040
>he has brake rotors

>>28659023 (OP)
If I'm getting fancy brake discs they'd better be ATOMIC

Drilled is a meme it just makes them more likely to crack. Vented and slotted better.

>>28659043
this post brought to you by drum brakes

>>28659063
most performance rotors are a meme. if you're at the point where you need drilled/slotted rotors, you'll know you need them.

>>28659063
Nobody on the entire board has seen a rotor split apart from being drilled. The "stress cracks" that develop around the holes are inconsequential.
That being said....
Drilled are stupid and provide zero advantage on a street vehicle.
Formula 1 doesnt run drilled or slotted rotors (pic)

>>28659206
I'm just gonna stick with napa rotors
there's no benefit to any kind of aftermarket rotor for 99.9% of cars. even if you track your car regularly, the different is negligible.

some wrc cars use drilled* rotors, but they also have a pit crew that changes rotors probably every fucking race

>>28659206
>Stress cracks
>Inconsequential

Brother cracks don't just stop. Drilled rotors suck, if you want holes in your rotor they need to be cast in.

For me, it's the wavy boys

>>28659206
>Formula 1 doesnt run drilled or slotted rotors (pic)
because the rules tell them what they have to use

>>28659197
slots can be useful for wiping off abrasive grit, but no good rotor is literally through-drilled; they are forged in place that way, or else it's trash

>>28659206
Doesn't apply to Carbon-Carbon brakes anon.
you can't slot C-C disks.

>>28659052
Hey that's kinda cool, do they make a semitic brake rotor?

>>28659043
>>28659094
Based drumchads...

>>28659206
>muh f1
well guess what nigger maybe cars don't need fucking windsheild wipers because a wheelbarrow doesn't havr them

>>28659274
Can't make a single continuous loop out of the Star of David so that's a no I'm afraid

>>28659094
Brakes?

>>28659023 (OP)
I drilled your mothers cunt

>>28659206
F1 would 100% drill rotors if they could, only for the fact that it would shave off weight.

>>28659561
And reduce braking performance anon.
I doubt F1 would do that at all.
Holes in rotors are for looks.
F1 is all function over form.

>>28659580
Even with the super soft, they still lock up.

>>28659597
Anon, that's at lower speeds.
I can't lock up tires on my race car at 120mph.
But I can at 60mph

Also, super soft tires aren't used anymore.
7 years ago was the last use.

>>28659028
Imagine not having sicc drilled and slotted rice rotors on your shitbox with hubcaps

>>28659690
You must be 18 to post here.

>>28659735
I've likely been here longer than you have been alive anon.

>>28659740
It's ok Timmy. There there. Almost bedtime.

>>28659206
hw did they make those holes then?

>>28659742
BOT post or shit bait?
Can't tell these days.
Y'all have no skill.

>>28659023 (OP)
nah i always want slotted only but nobody ever stocks them. then when i got to order they tell me it will take a month. everytime. some sort of jewish slotted rotor racket going on

>>28659052
>ATE Powerdiscs masterrace
They just shred brake pads but its worth it

>>28659023 (OP)
how many horsepower does that add?

>>28660372
None. But it helps vent gasses from very hot pads

>>28659023 (OP)
Now here's the question, does anyone on /o/ drive anywhere near the level that this would make any kind of difference?

>>28659206
>Nobody on the entire board has seen a rotor split
I'm >>28659063
My boomer uncle who has raced spridgets since 1964 and built racecars for customers for decades used to drill rotors himself, until one customer's cracked thru the drilled holes.
Like this >>28659216
He kept the rotor and showed it to me but it was in like 2007 so I don't have a pic.
Not worth it to drill rotors just for looks. & nobody can show data showing a significant enough improvement in lap times or braking feel that a hobbyist track user would appreciate with drilled versus not drilled. Why bother?

>>28660416
I melted my pads to my rotors street driving so yeah

>>28660467
You need higher temp pads, a drilled rotor wont do shit for you, at the operating temperature of regular ceramic pads, (cold to 300f) the holes and slots are places your pad isn't touching to slow the car down

>>28659283
Drumfags are just larping as bandchads

>>28660375
What "gasses"?

>>28660563
This, if your ceramic pads are gassing out, you don't need a rotor upgrade, you need to calm the fuck down on the touge because the brakes are likely becoming ineffective, you need to run those loud ass metallic brake pads that actually work at high temperatures, Ceramics are very good but they perform best when being used for commutershit like driving on cold brakes.

>>28660467
I do know a guy who did that irl too. But it was because he overloaded his work van with bricks and was speeding down one of the bigger hills in town.
Dude had no thought in his head about things

>>28660621
Kek gotta be engine braking down hills in vehicles, especially with a load, that's why they put tow/buttons in trucks, is to engine brake it, normally automatic transmissions wanna be in the highest gear, especially if you take your foot of the gas, which is basically like driving off the edge of a cliff when going downhill without engine braking, you will not be able to stop.

>>28660563
>What "gasses"?
Apparently some pad materials will "out-gas" from material degradation when they get very hot (probably not ceramics). This gas is obviously produced most at the pad/rotor interface and can act as a lubricant, reducing friction.

>>28659206
>Formula 1 doesnt run drilled or slotted rotors (pic)
Formula 1 doesn't run steel fucking rotors.

>>28663784
Way to prove is fucking point Anon, you're right they don't use steel rotors, they go right to materials that can handle the extreme temperatures, steel rotors with rice holes and slots in em will not help you and it's worse at lower temperatures because surface material is fucking missing for the sake of rice.

>>28663884
How does that prove (you)r point? Pointing out that that F1 uses materials that handle higher temperatures and don't need the cooling steel rotors would doesn't prove that steel rotors don't need holes or slots.
You're an retard.

>>28663922
If holes in the rotors helped at all, literally all the mass produced, single piece cast hat steel rotors would have drilled and slotted in them, also regular brake pads themselves can't even operate at temps where the rotor is a problem.

>>28663933
>If holes in the rotors helped at all, literally all the mass produced, single piece cast hat steel rotors would have drilled and slotted in them
Because it costs more in machining and no, it's not needed for fucking dumb soccer moms driving their shitty crossover to Starbucks.
>also regular brake pads themselves can't even operate at temps where the rotor is a problem.
Do you know what conduction is? Thermal mass? Specific heat?

>>28663983
>Because it costs more in machining and no, it's not needed for fucking dumb soccer moms driving their shitty crossover to Starbucks.
It's ricer shit Anon, you wanna go hard with the driving, you get brake pads with semi metallic content that shoot sparks and brake dust like a motherfucker but stop extremely well at high temperatures, and if that's not enough you upgrade your brakes with bigger rotors, a bigger brake caliper with more pistons, drillng rice holes will not help you, it costs real money for real braking performance increases, which means if you have a regular car with blank discs and some lovely brake pads from Akebono that are gonna stop and not blow brake dust everywhere and make a loud SCREEEE noise, you already have peak braking system for the vast majority of people, and that's okay.

>>28663988
>some holes for cooling are rice!
>get 600mm rotors and 10-piston calipers
kek

>>28663997
They work Anon, I wouldn't upgrade brakes myself, I just drive better and engine brake when you have to big ass brake rotor will give you a better performance increase than drilling rice holes in an economy car sized rotor, those pieces of shit need all the surface area touching the pad as possible.

>>28664000
>big ass brake rotor will give you a better performance increase
>economy car sized rotor, those pieces of shit need all the surface area touching the pad as possible.
lol

>>28664009
It's true, you think those cheap ass brake kits on amazon with drilled and slotted rotors were born like that? These retarded sellers are taking like 262-282mm little ass shitbox rotors like you get from Autozone or Rockauto for $30, drilling rice holes and selling them to retards as a performance part, meanwhile you're paying more for less rotor.

Lads, I need better brakes.
150mph stops on track ain't going so well.
Even a 3in brake duct keep shit from melting.

>>28664012
Oh yes, much rice, very shitbox.

>>28664017
MotoGP bike?
Must be rice.

>>28664017
It is rice, those lil J hook slots not being in the rotor aren't gonna cost the MF the race

>>28664028
Multi-million-dollar race teams with dozens of engineers in their employ?
Rice.

>>28664033
Kek they even fed an air ram into the ventilated disc because slots n holes are rice

>>28664041
Ferrari F40?
Rice.

>>28664012
ahahaha Nigger do you have any idea how much it would cost to do that as opposed to just make it part of the production process?

>>28664043
>race car company selling road cars to fund their team turned racecar LARP for rich boomers uses rice rotors to make them feel like a special boi race car driver
Why am I not surprised

>>28664045
it doesn't cost that much to drill and mill a rice rotor, that's why the markup you pay for a drilled and slotted one over a $40 blank is quite laughable, and you don't even gain anything.

Kek, the retard just keeps digging himself deeper.

>>28664069
>it doesn't cost that much to drill and mill a rice rotor
>it doesn't cost that much for tooling, setup, machine time, shipping to and from
lol
lmao

>>28664016
Bilge fan on the brake duct?
water mist system?

>>28664081
They're not as complicated as you'd like them to be, Anon, they're just milling holes and slots in regular rotors they got cheap which most people should be doing, it's often done in such a crude manner that the fucking brake pad don't even line up with the holes or slots perfectly because it's so retarded.

>>28664017
Not sure what you are implying anon.
AP racing J-hooks are the GOAT.
But those are brake kits that cost $10,000 a corner

>>28664090
It was sarcasm, because retard anon thinks it's rice.

>>28664093
It is rice, you're focusing on the rotor and not the purpose built racecar around it, which has intakes funneling air toward the brakes, which actually cools them.

>>28664086
The stock car guys told me the Brake fans were kinda pointless outside the pits.
They only supply more air than moving under 25mph

>>28664093
No dilled rotors though anon.
Slots are fine.

>>28664097
>it has cooling ducts for the brakes, but they put slotted rotors on a purpose-built race car for no reason
You don't even realize how dumb you are, do you?
Just like you don't even know how little you know about engineering and manufacturing.

>>28664100
I know sufficiently big money rally teams run liquid cooled calipers if you're looking to spend a lot of money
https://apracing.com/race-car/brake-calipers/rally-range/6-piston-liquid-cooled-radi-cal-rally-raid-cp6768-o320mm-max-disc

>>28664101
I know alot about racing around and metallurgy, and rice rotors will not help you, yeah purpose built race cars have it whether it you think it immensely helps them or not, but we don't drive racecars daily, we drive factory cars.

>>28664105
>drilled/slotted rotors do nothing and are rice
>well multi-million-dollar race teams use them, b-but commuter cars don't need them

>>28664120
They dont do much for the racing teams, they just get whatever high performance shit they can either buy get sponsored for, and more often then not the rotors look like that, but its not a game changer, and certainly not gonna help you on a regular car with low temperature, quiet, low dust, ceramic brake pads.

>>28664122
>big money race teams just slap together whatever they can find
>only full-blown race cars and boring commuter shitboxes exist, there's nothing in between
lel

>>28664103
I've seen those. A few showed on on eBay for $5,000 each a while back.

>>28664120
NASCAR, Indycar and F1 do not use drilled rotors.
I don't know of any professional racing series that uses drilled rotors.
Drilled rotors are a byproduct of race cars from the 60s that had brake pads that outgased a fuck ton.
Modern pads don't do that.
Hence why we door see it outside street legal cars. (Looks not performance)

Why do virtually all bikes come with drilled rotors if they're just rice? Tradition and aesthetics?
Not a rhetorical question I genuinely don't know and always wondered

>>28659023 (OP)
Stinky chinky rotors usually come drilled nowadays and are often cheaper than solid so fuck it.

>>28664130
>only full-blown race cars and boring commuter shitboxes exist, there's nothing in between
Kinda, maybe not commuter econoboxes, but certainly cars exist as either purpose built race cars, or production cars, there's homologation stuff like the original ///M cars, but even those are so mass produced at this point that they're regular production cars.

>>28664132
>Drilled rotors are a byproduct of race cars from the 60s that had brake pads that outgased a fuck ton
that's what I keep trying to explain to the rice rotor fans, brake pads are so fucking good now, that you do not need all this nonsense, it's rice, it's like the "cone air filter sitting in the engine bay soaking up heat" of brake rotors.

>>28659235
jaiden smith brakes

>>28664134
>>28664154
the holes and grooves and wavy edges increase the surface area that can radiate heat and improve the cooling of the brake disc.
people who say it's pointless or they don't do anything are peak midwits.

>>28664244
Uhh anon, the ventilated disc brake on your car radiates heat all the way around the damn thing and sheds heat very well as it spins, you do nut need to drill holes in the sonuvabitch, a bicycle disc being all Swiss cheese like might even be more ridiculous because a bicycle with a person on it really doesn't make much heat at all, and at one point bicycles only used the wheel as a brake rotor and no one ever complained about losing brakes on a bicycle due to heat

>>28664313
>a bicycle disc being all Swiss cheese like might even be more ridiculous
Not him but I think for bicycles it's a weight saving thing and maybe also for the dirt to escape somewhere quicker. Bicycle wheels normally rotate way slower than in cars or motorbikes, so you have fever revolutions to a stop.

>>28664351
Youre likely right, especially on mountain bikes, good luck using thay rim brake if you ride through a bunch of mud due to to how low your brake surface is to the ground

>>28664313
>Uhh anon, the ventilated disc brake on your car radiates heat all the way around the damn thing and sheds heat very well as it spins, you do nut need to drill holes in the sonuvabitch

if the holes on the edge help cooling than the holes in the surface obvs make it more betterer because there is more surface area.
also rear brake discs sometimes do not have vents at all. in that case a drilled rotor is totally appropriate.

the big downside to slotted and drilled rotors is they make noise and vibration most people don't want. they eat pads a little faster and you cannot use a metallic pad like you would on a solid disc, as the pad will eat into the rotor and the slots and holes turn into a very expensive metal cheese grater that will even more quickly nuke any replacement pads. ceramics only.

they do seem to actually help a lot when the brakes start fading during enthusiastic mountain pass driving, i've no science to back it up by my experience tells me they cool off faster than solids and the approach to "oh fuck it's not stopping" is much more gradual and controllable. do they make you faster or stop better? probably not, but they do seem to operate better at extreme temps you might encounter in a road car that doesn't have all the air ducting of a racing car.

>>28659023 (OP)
I think they do. It's rice for just about every streetcar, but it adds detail to the wheel.

>>28664376
>the big downside to slotted and drilled rotors is they make noise and vibration most people don't want. they eat pads a little faster
That's really the major problem that I have with the drilled and slotted rotors, guys will buy them and put it on their car made for comfort and quiet, and then they hit the brakes and they go BRRRRRRRR, they think there's some sort of a problem, but that's literally the sound drilled and slotted makes when you really get on em, meanwhile if you wanted a quiet brake system, you should've stuck with the OEM blanks

https://www.youtube.com/watch?v=M1bFJp--s2E

>>28664313
I meant motorcycles, my bad

My carbon ceramic rotors are drilled. OP is angry that this 98 corolla doesn't have them. I feel for him.

>>28664670
So you either drive a race car or a riced out rental. Which one is it?

I've done thousands of laps on drilled and slotted rotors and have never heard or felt anything different about them, ever, not a single time. Maybe it's a Chinesium problem.

>>28659023 (OP)
They are visually more interesting than plain rotors. OP is autistic to the point of being unaware of any viewpoint other than his own. OP is also (as always) a ginormous faggot.

>>28664684
>They are visually more interesting than plain rotors
So you're a ricer.

>>28664685
> ricer
I don't have them on my car.
They draw the eye to the wheels, and present more visual interest in the wheels. Some people want to do that as a styling move. You, on the other hand, wear Dockers.

>>28664684
Yes it looks visually appealing, but you lose surface area that you need for breaking, Anon... that's not a good thing, and it's not even like ceramic break pads can operate at super high temps either, which means that from dead cold to normal operating temperature, which is where you will spend all your time unless your ceramic brake pads start getting too hot and smoking, a guy with the same car as you but with blank OEM style rotors will have better brakes than you, probably quieter brakes as well.

>>28664685
It'd be done thing if it was just visual and that was it, but it amazes me how much people are willing to sacrifice for rice, it's no different than taking our your stock airbox, which succs air from areas where the air is cold, putting a rice cone filter in there so it looks like one of those tooner cars, and thinking you gained anything with all that induction noise, but really you're just heatsoaking and losing power.

>>28664690
>You, on the other hand, wear Dockers.
I'm wearing Dickies™, tho

>>28664685
Hell yeah I am

>>28664690
Dockers are comfy

>>28664691
>Yes it looks visually appealing, but you lose surface area that you need for breaking
lol>>28664033
>>28664027
>>28664017
>>28664043
>it's not even like ceramic break pads can operate at super high temps either
It's funny how you harp on about pads not handling higher temperatures while unironically saying something that adds additional surface area for removing heat are rice.

>>28664752
The brake pads would be operating outside of their temperature range Anon, that's kinda the problem, it's like using a high performance summer tire in sub zero temps and expecting to slay, you're gonna be riding on literal rocks and could die in an accident because the grip levels would be so low due to the compound of the tire being made to operate at extremely high temps where the tire is nice n sticky, that's why it's the epitome of cringe when people put rotors with surface material cut out of em on cars, especially ones with ceramic pads made for cruising around, it's just less braking for no reason.

>>28659023 (OP)
unless you're driving a super car around the track, you really don't need drilled discs

>>28664805
>extreme temps
>200f

>>28664816
That's what I keep trying to tell these motherfuckers, you will smoke the shit out of your brake pads before the rotors themselves even glow or have a problem, and dudes with economy cars act like ricing our their car with nonsense is gonna help them not burn out the brakes, instead of just gitting gud.

https://www.youtube.com/watch?v=4TEqkrs57ZM

>>28664805
>it's just less braking for no reason.
lmao
>The brake pads would be operating outside of their temperature range
You're really still missing my point entirely. Guess I shouldn't be surprised.

>>28664822
Your point is retarded, take a car with blank rotors and a similar car with riced out crap they got online with holes n slots in it, the car with OEM style rotors will have more braking going on at temperatures you would be using them at, even when doing spirited driving you're not gonna burn em out unless you're riding them, and holes n slots won't protect you from being a retard and the brakes losing effectiveness from being ridden.

>>28664866
You not understanding does not mean my point is retarded.
>car with OEM style rotors will have more braking going on
LOL
O
L

>>28664870
Yes Anon, brake pad touching more thing to slow down=good

>>28664875
Fucking kek.
>This paper presents the examination of the temperature and warmth motion at the plate interfaces utilizing an itemized 3-dimensional limited component model of a genuine vehicle brake rotor. Rotor disc are made utilizing CATIAV5R20 and recreated utilizing ANSYS R 20 which depends on the (FEM) analysis. Here take cast iron material and seen that the maximum temperature and heat fluxes values for all three geometries like Solid rotor drilled rotor and drilled & slotted rotor respectively like are 589.48 °C, 555.67 °C and 539.97 °C and 2.9e5 w/mm2, 4.96e5 and 5.04e5w/mm2. Here we can clearly observe that drilled & slotted rotor geometry has very high value of heat flux compare to other rotor geometries.

https://www.sciencedirect.com/science/article/abs/pii/S2214785321038931

>>28664875
>brake pad touching more thing to slow down=good
>t. me no take basic physics class
https://pubs.acs.org/doi/10.1021/jp036362l

Slots are good for keeping pads true.
But drilled holes do absolutely nothing.
They don't cool better,
they don't improve friction
They don't offer any meaningful weight reduction.
Meme shit for show

>The study shows that changing from straight vents to curved vents improves thermal performance without affecting the mechanical behavior. Moreover, the thermo-mechanical behavior is further improved by adding holes and slots on the surface, along with curved vents.
https://www.researchgate.net/publication/385290684_Impact_of_Curved_Vents_Holes_and_Slots_on_Thermo-mechanical_Behavior_of_Automobile_Disc_Brake_-_FEM_Simulation_and_Validation

>In all respects, the cross-drilled rotor distribution of temperature is much higher than the solid disk.
https://www.sciencedirect.com/science/article/abs/pii/S2214785321041559

>Wallis [17] conducted dynamometer testing of standard and cross-drilled radial vane ventilated brake discs. It was found that cross-drilled holes shortened the stopping distance of a vehicle for a given brake pressure, and reduced brake disc temperature. On-vehicle test by Antanaitis et al. [18] revealed superior cooling performance of cross-drilled brake discs compared with standard ones. With respect to local fluid flow behaviors, Barigozzi et al. [19] measured the distribution of axial velocity component near the rubbing surface of a cross-drilled brake disc by laser Doppler anemometry. They reported that cooling air was drawn into the ventilated channel through these holes.
>The gradient of axial pressure is found to drive the cooling air into the ventilated channel through cross-drilled holes. Such a special flow accelerates external boundary layer flow over the rubbing surface, enhancing therefore local heat transfer. Additionally, the through-hole flow removes heat via the surfaces of the holes while air jets issuing from the cross-drilled holes deflect to suction sides of the vanes, improving further local heat transfer.
https://www.sciencedirect.com/science/article/abs/pii/S1359431115008388?via%3Dihub

>>28665108
AP racing said in their testing, rotor holes actually increased rotor temps.
I'm gonna believe a supplier of 80%+ of the NASCAR and Indycar field over some Chink study

>>28665192
lmao

>>28665194
> Yan a b, S.S. Feng b c, X.H. Yang b d, T.J. Lu b
Implessive

>>28665201
>FEA calculations and empirical data built off of fundamental thermodynamic principles don't count because the names!

>>28665240
Yes.

I do not trust liveleak, the country

>>28665240
The chong boys don't make any brakes for any racing series.
I'll trust a suppier to 80%+ of professional racing teams over the chink scam artists.

>>28665249
>>28665243
You can be honest and say you don't understand any of the stuff in those papers, it's okay.

>>28665201
>Wallis, Antanaitis, Barigozzi
>vely ching chong

>>28665240
>chinese notorious for making shit up
Yes.