ok sorry for a stupid question..but i'm just wondering why people choose to go for drilled or slotted rotors? i know i don't need them but wondering what makes them stop faster and stuff..here's what i know so far:

more surface area = more friction = more braking power...slotted and drilled rotors both take away surface area so how are they able to stop the car faster?

also, i heard slotted helps prevent warping...why is this?

secondly, are drilled rotors created so they heat up and cool down faster?

thanks guys

 

If you do a search you'll find a lot of info about it, most of it saying how un-needed it is.

Drilled rotors came about when brake pads would produce large amounts of gas when they heated up. Since you didn't want a cushion of gas developing between your pads and rotors, the holes were drilled to allow the gas to be collected and released after that section of rotor passed through the pads.

Slotted rotors were developed to "scrape" the pad surface to keep it clean and keep gunk from building up on them.

With today's pads, neither drilled nor slotted rotors are needed, and neither will make you stop faster.

 

short answer-they dont

 

If they're not better, then why do high-end cars (e.g. Porsche 911 Turbo) use them?

 

to dissipate heat better and to reduce brake fade.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">If they're not better, then why do high-end cars (e.g. Porsche 911 Turbo) use them?</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">to dissipate heat better and to reduce brake fade.</TD></TR></TABLE>

Wrong!

Porsche's literature claims to improve wet braking performance.

http://content3.us.porsche.com...ystem

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by porsche &raquo;</TD></TR><TR><TD CLASS="quote">Wet-weather performance is considerably enhanced with the aid of cross-drilled discs. By enabling rapid dispersal of the water vapor generated under braking, the distinctive drill-hole pattern ensures greater consistency in the wet.</TD></TR></TABLE>

 

so they don't dissipate heat any better?

 

i used search. my bad.

searched more and now i'm confused
http://www.altimas.net/forum/s...32327

this guy says they do dissipate heat. drilled rotors i mean. i guess it's irrelevant.




Modified by mr. carpenter at 7:10 AM 6/14/2004

 

More surface area dissipates heat better. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">i used search. my bad.

searched more and now i'm confused
http://www.altimas.net/forum/s...32327

this guy says they do dissipate heat. drilled rotors i mean. i guess it's irrelevant.


Modified by mr. carpenter at 7:10 AM 6/14/2004</TD></TR></TABLE>

More surface area dissipates heat better. Why? I guess the heat is dispersed over a larger area. Drilled/slotted rotors are just decreasing surface area.

I have a BASE RSX (10.8" rotors) and swapped to Type S (11.8" rotors) brakes up front. I'm still using the OEM pads. Have I noticed shorter stopping distances? Nope. The only thing that has changed is heat dissipation. It was really easy to cook the 10.8" rotors, but it's a different story w/ the 11.8s.

 

vent the heat out of the caliper.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">searched more and now i'm confused
http://www.altimas.net/forum/s...32327

this guy says they do dissipate heat. drilled rotors i mean. i guess it's irrelevant.
</TD></TR></TABLE>

Did you read that whole thread?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackdc5 &raquo;</TD></TR><TR><TD CLASS="quote">More surface area dissipates heat better. </TD></TR></TABLE>

If you have the air to cool it with

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">I have a BASE RSX (10.8" rotors) and swapped to Type S (11.8" rotors) brakes up front. I'm still using the OEM pads. Have I noticed shorter stopping distances? Nope. The only thing that has changed is heat dissipation. It was really easy to cook the 10.8" rotors, but it's a different story w/ the 11.8s.</TD></TR></TABLE>

Actually what's changed is the system now has a larger heat sink (bigger rotor) and has more thermal capacity.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slow_Em1 &raquo;</TD></TR><TR><TD CLASS="quote">vent the heat out of the caliper.</TD></TR></TABLE>

No. Run ducting to the center of the rotor.

 

back from the dead!!! The zombie thread from hell!!! can anything kill it?

 

Oh, the holes in Porsche rotors arent fully cast in either, partially cast then machine finished.

 

The reason the rotors are drilled on high end cars is:

1. less rotating mass to accelerate / decelerate.

2. less unsprung weight.

3. it looks cool.

4. when you pay that much for a car somethin' better look cool.

How MUCH does it help? I donno.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Grumpy &raquo;</TD></TR><TR><TD CLASS="quote">The reason the rotors are drilled on high end cars is:

1. less rotating mass to accelerate / decelerate.

2. less unsprung weight.

3. it looks cool.

4. when you pay that much for a car somethin' better look cool.

How MUCH does it help? I donno.</TD></TR></TABLE>

Bingo, thats all folks, lock please...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda318dx &raquo;</TD></TR><TR><TD CLASS="quote">Bingo, thats all folks, lock please... </TD></TR></TABLE>

Winner!