Smooth, slotted, or dotted? Which is best?
>>13818737
drilled is cancer
slotted is ok in small doses
solid a best
Worn
In that order from road car to race car. Smooth provides adequate braking power for most cars and lasts the longest.
>>13818737
Drilled does nothing aside from reduce the area of the brake disc.
Slotted reduces the area but allows gasses to escape, useful for hard braking.
If by solid you mean vented, that's fine. Actual solid rotor though? shit and not used anymore.
>>13818787
if drilled does nothing but make it brake worse, why do they drill them?
>>13818803
The holes chop off small portions of the brake pads making them fresh or something.
>>13818803
Consumers are stupid
>>13818803
The idea is the same as slotted but they don't work as well and are weaker. It's easier for gas to escape into the channel of the slot and out of the rotor than to just have a hole it may or may not go through.
Slotted tends to eat pads though.
Slotted #1 for brake dust production
Blanks on the street, slotted on the track
drilled never
>>13818838
Production? How does that work? Why would slotted produce more dust?
>>13818803
its for looks
>>13818803
Drilled rotors do the same thing as slotted in they let the gases escape but they don't chew up the pads as bad as a slotted. With that being said they are far more likely to crack or warp than slotted rotors. Personally I would much rather have to buy pads twice as often then have to deal with cracking rotors.
https://youtu.be/78wbht355R8
>>13818803
drilled are more failure prone, otherwise they're not worse.
bare in mind /o/ gets it's information from engineering explained who did done zero (0) real world before making his claims
watch his strut brace video to see what a shitter he is
>>13818834
I've found that drilled and slotted chew pads more than just slotted. I remember someone here described how drill spots are basically cheesegraters that ensure you're always on fresh pad material. This is important in racing because it makes the brakes perform the same all the time, at the expense of wearing through the pads quickly
>>13818787
>muh surface area
overrated desu
>>13818737
Solid >= slotted >>>>>>>>> drilled
>>13818787
Solid discs are commonly used on the rear of vehicles.
the guy I bought my Miata from installed drilled rotors on the front... I'm ashamed every time I look at them :(
>>13819261
Relax
>>13819261
your dad feels the same about you
>>13818737
There's a reason that the P1 has solid discs. More surface area for braking.
>>13819305
They're vented, not solid.
>>13819309
Pulling statements out of your ass, I see
Protip: Surface area doesn't matter as much as the braking system's ability to convert kinetic energy to heat and its ability to store and expel that heat.
>>13818737
By smooth are you referring to the face of the disc having no cuts into it?
>>13819305
>>13819336
you mean blank not solid
baka desu kid
>>13819336
>I don't know what vented discs are
Ok.
>>13819342
Which surface area directly affects.
>>13819336
He's right. They're vented in the middle, not solid. This is different from slotted
>>13819354
Not him but I feel retarded now, I have always thought they were solid but they were actually vented. Guess I have never seen true solid rotors then.
>>13818737
>chrome rims in 2015
>>13819446
It's ok m8 I also had to learn that from 4chan. I always just called them solid rotors
>>13819466
Those are polished.
J hooks>>>>>>>>>>>>>>>>>>
>>13819446
They do make solid rotors tho
>miata rear disks
solid is best braking
drilled is cancer
cast with holes is good in wet conditions
slotted is cancer
>>13820394
How is slotted cancer?
>>13818737
>red mi4 with a lip
>>13818737
Slotted is the best for performance. Drilled is best for muh aesthetics.
>>13818737
too many factors desu m8
you'd need to properly assess each one, quantify all the variables first then calculate off that
no point really, you're not a racer so just buy what you like.
>>13818745
>>13819083
Yeah its not that he is dumb, but he really likes to just talk out of his ass sometimes and base claims on theory alone. Engineers are all guilty of it sometimes though, myself included. At least he didn't say that an alternator was a turbo.
Drilled is fine for some pads because it gets rid of brake dust which helps keep the pads gripping evenly.
They do not do anything to help with heat. It is the vents between the rotors that heat escapes through, not those holes or slots.
And for most pads, clearing out brake dust is not an actual problem.
So the answer is that it depends, but usually smooth is best.
>>13818745
I used to see this posted all the time and din't really understand it. Obviously it looked bad but I didn't know much about rotors then but now I do and I just can't understand how this is even possible unless it was done deliberately.
>2015
>not using Kangaroo rotors.
https://www.youtube.com/watch?v=8PzWFn6lGBs
>>13822206
They were machined down.
You can get your rotors shaved to smooth them out instead of replacing them.
That just got shaved way down to make the joke of an image.
>>13822193
explain how one set of holes helps cooling and another doesn't
>>13822214
hahahahhaa you honestly think that?
there are hundreds of images of that out there, retards (especially americans where they have no safety standards) have word down discs/pads so bad to where the disc is broken, or the actual calliper piston is worn out.
>>13822206
discs wear out over time
>>13822213
holy shit this looks cool.
>>13822219
>implying "safety standards" make a difference if they wear in between inspections
>>13822219
Yes. You can clearly see the that it's machined far away from the brake caliber. That could not have happened normally.
>>13822215
wot?
Vents are slots in the center, not holes.
Drilling rotors lowers the surface that can be gripped on.
These things have been around for decades. Many tests have been done.
>>13822215
I'm not even that guy, but you don't have to be a genius to realise air will flow a lot better between the inner and outer disks like a turbine than it will through cross drilled holes, dumbass.
>>13822229
discs wear over a long period of time, most countries that have safety inspections mandate a minimum pad thickness and minimum rotor thickness.
Along with other useful things like minimum tread depth.
>>13822232
>>13822232
>>13822232
not a disc but close
>>13822244
Haha holy shit.
I guess I stand corrected.
>>13822232
>>13822328
Shouldn't someone have their drivers license taken away fro that?
>>13822378
In theory that can happen here in Norway, as you are as a driver supposed to make sure that your vehicle is, at all times, equipped to meet a standard of safety so it doesn't pose a risk or hindrance to anyone or anything, and with brakes in that condition you could be hit with a "reckless driving" charge and instantly lose your license in the worst case scenario
>>13822378
over here the driver would be charged with driving an unsafe vehicle, which at the most would result in a 6 month suspension and confiscation of car (along with a hefty fine).
on the other hand the last safety inspection on the car, he gets royally fucked up, massive fines and imprisonment. Its even worse if the car got into an accident.
>>13818787
>Actual solid rotor though? shit and not used anymore
They still get used on Caterham-style cars (but not actual Caterhams), even some racers use them. It's pretty hard to overheat a solid disk in a 500kg car with 130hp.
>>13821263
but he should know that theory alone doesn't mean much.
especially, like >>13820790
says when you're basically making calculations with limited info.
most experienced engineers know this. engineering isn't just math, calculators exist for that.
the human element is supposed to bring common sense, inspired thinking and judgement.
t. design engineer
>>13818847
This. Precisely.
>>13818737
Shallow slotted. The slots keep the brake pads nice and even,and get rid of debris. Not too deep,or you'll weaken thr rotors. Of course you'll want them vented too.
Dotted and drilled both add stress points, that's highly undesirable. Only point where you'd want drilled rotors is in offroad stuff like rally,to get debris out ASAP.
Smooth means there's nowhere for debris to go but between the pads and rotors, causing uneven wear.
Holy shit /o/ is retarded.
Solid (vented), slotted, drilled..
That's the best order for a road car.
Drilled, slotted, solid (vented)..
That's the best order for a race car.
Solid (vented), slotted, drilled..
That's the order for best surface contact.
Drilled, slotted, solid (vented)..
That's the order for best heat dissipation.
Road cars get most surface area so they brake quickest. But you shouldn't be heavy on the brakes all the time in a road car. So heat isn't a big issue for regular driving.
Race cars get the least surface area because they have like 6 or 8 piston calipers, with carbon pads and are NOT good for road use. (Brakes need to heat up to work properly).
As race cars use brakes a lot and from a much higher speed (more energy/heat required to stop the car) they heat up quicker, so they need to be able to cool down.
Drilled are prone to cracks, as they have less space and structural strength - obviously. Solid will last a lot longer.
I've used drilled and slotted on my daily shitboxes and they were fine. Why did I do this? They were cheap and lol it looked funny.
Shit niggas, l2mechanics
>>13822213
Yea this is bullshit.
>>13822943
You don't know shit.
>>13823207
>"you don't know shit"
>proceeds to offer no further rebuttal
>literally adds nothing to the conversation
Stay booty blasted
>>13818745
>>Woman driver confirmed
>>13823256
I'm not going to waste my life trying to educate you. You're not an engineer, stop pretending you are.
>>13823290
Confirmed for rump rustled
>>13823329
Confirmed for brain damaged.
>>13823353
Yep, you literally don't know shit. Go back to lurking and come back when you have some knowledge of cars and mechanics.
>>13818803
Unsprung mass.
Makes virtually no difference in street cars, but in super light weight race cars it does.
>>13819305
>>13819336
Bad example chaps, they're carbon/ceramic
I heard drilled rotors help wet performance, but I was reading about motorcycle brakes. Is this true?
If so, I am guessing it's not the same for cars?
