Are drilled and slotted rotors worth the cost?

[CleverUserName]

I have powerstop Z23 kits on 2 cars. They are fantastic for normal driving and upgrade over stock. 50k miles on one car and they have hardly any pad wear. The rebate process is easy and they deliver.

I plan on putting a Z36 kit on my truck when brakes are due.

 

[Rust_Belt_Pete]

Lighter rotors dont manage heat faster, if this was the case every sniper rifle and machine gun barrel would be pencil thin.

 

[BMWTurboDzl]

Nah you are out on thin ice.
Light rotors overheats faster. Cant hold enough heat.
Lots of heat generated when you brake.
Blank rotors are still vented, if they aren't upgrade to vented.

Lighter rotors are always better for a track environment They shouldn't be drilled but still

 

[Rust_Belt_Pete]

Agree to disagree

Its thermodynamics, that is like arguing with gravity when falling.

 

[BMWTurboDzl]

Lighter rotors dont manage heat faster, if this was the case every sniper rifle and machine gun barrel would be pencil thin.

Different application. A gun barrel isn't being actively cooled

 

[Kalle.J]

Different application. A gun barrel isn't being actively cooled

Heard of thermal radiation? Works in vacuum if you didn't know.

 

[BMWTurboDzl]

Heard of thermal radiation? Works in vacuum if you didn't know.

Not relevant. A gun barrel is made as heavy as required. It could be heavier but it's not. Why is that?

 

[Kalle.J]

Not relevant. A gun barrel is made as heavy as required.

Very relevant, applies to brake discs which you can see as a thermal management system.
Same concept for brake dics they are made as heavy as required. Sometimes not heavy enough.

Go look at 18 wheeler truck brakes, no dimpels or holes to see anywhere.

 

[BMWTurboDzl]

Its thermodynamics, that is like arguing with gravity when falling.

No it's not. You want as much mass as required but no more. For example switching out single for two-piece would be better.

 

[kitchbow]

Thanks for the replies..........

 

[Kalle.J]

No it's not. You want as much mass as required but no more. For example switching out single for two-piece would be better.

 

[Rust_Belt_Pete]

Different application. A gun barrel isn't being actively cooled

Gun barrel is being cooled the same way as the rotor with ambient air just slower.

 

[BMWTurboDzl]

Very relevant, applies to brake discs which you can see as a thermal management system.
Same concept for brake dics they are made as heavy as required. Sometimes not heavy enough.

Go look at 18 wheeler truck brakes, no dimpels or holes to see anywhere.

Do you honestly think a vehicle with solid one piece brake rotors will have better brake performance compared to the same vehicle mounted with lighter fully floating rotors that have the same heat capacity?

 

[BMWTurboDzl]

Gun barrel is being cooled the same way as the rotor with ambient air just slower.

Right, and the barrel could be made heavier but it's not.

 

[Kalle.J]

Do you honestly think a vehicle with solid one piece brake rotors will have better brake performance compared to the same vehicle mounted with lighter fully floating rotors that have the same heat capacity?

You pulled that statement out of thin air.
Do you know why a two piece floating rotor is lighter?

 

[Kalle.J]

Ill try to explain it to you.
The actual disc part of the rotor is not necessary any lighter.

Floating discs can reach higher temps without warping, because of the floating nature and thermal decoupling and are for track/sport vehicles with pads that also allows higher temperature. With higher disc an pads temperatures you have off-gassing of the pads which is one reason to have dimples.

Brake force comes from friction ie pads and pressure. Not any special kind of rotor.

 

[BMWTurboDzl]

You pulled that statement out of thin air.
Do you know why a two piece floating rotor is lighter?

No I didn't pull it out of thin air and and yes I do.

 

[BMWTurboDzl]

Ill try to explain it to you.
The actual disc part of the rotor is not necessary any lighter.

Floating discs can reach higher temps without warping, because of the floating nature and thermal decoupling and are for track/sport vehicles with pads that also allows higher temperature. With higher disc an pads temperatures you have off-gassing of the pads which is one reason to have dimples.

Brake force comes from friction ie pads and pressure. Not any special kind of rotor.

Exactly and the design is why the rotors are lighter.

 

[BMWTurboDzl]

Here's an interesting video. This is between vented stock vs directional vented and lighter rotors. The lighter rotors ran cooler because of the better cooling efficiency.

 

[Rust_Belt_Pete]

Right, and the barrel could be made heavier but it's not.

But it is. The reason its not made any heavier is because it has to be carried by a person.
Go compare the barrel mass of a hunting rifle that shoots maybe 3 times to that of a miliary weapon.