I remember seeing this info somewhere on the web. Does anyone else remember seeing this?
IIRC, some slotted patterns work better than others for cooling the rotors and/or venting brake gas off the rotor surface.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by genxguy &raquo;</TD></TR><TR><TD CLASS="quote">I remember seeing this info somewhere on the web. Does anyone else remember seeing this?
IIRC, some slotted patterns work better than others for cooling the rotors and/or venting brake gas off the rotor surface.</TD></TR></TABLE>

i think almost everyone in here to a man/woman thinks slotted rotors are for the birds, but i can imagine that there might be a difference in slotting patterns that are more "beneficial" than others...

 

Are you thinking of veins? There are different configurations of veins within rotors and some need to be installed in a specific orientation if they are directional. Veins do help to cool the rotor surface, slots do not. At best, slots will keep your pad surface clean. Neither veins nor slots will vent brake pad gasses.

 

I've never seen a rotor with "veins".

I've seen many with "vanes", though...

Solid rotors that are vented are the best, IMO.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMDA9 &raquo;</TD></TR><TR><TD CLASS="quote">I've never seen a rotor with "veins".

I've seen many with "vanes", though...

Solid rotors that are vented are the best, IMO.</TD></TR></TABLE>

LOL! ahhh crap, that's the med school talking

 

slotted rotors are used in some race applications to increase bite; whether they are beneficial or not really depends on your racecar and the racing you do

vanes come in different orientations, i have some pics with 6 different designs and their relative ratings for heat transfer and strength. dont think i have a way of posting it; no digicam or scanner

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NegativeLift &raquo;</TD></TR><TR><TD CLASS="quote">slotted rotors are used in some race applications to increase bite; </TD></TR></TABLE>

Funny, I've never heard this. I thought it was purely for shedding pad dust and material.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GreyTeg &raquo;</TD></TR><TR><TD CLASS="quote">

Funny, I've never heard this. I thought it was purely for shedding pad dust and material.</TD></TR></TABLE>

i think we dont hear about it much in production car racing because its seen as an advantage mainly on high downforce cars. I'm not sure if the bite function then becomes more important than the cleaning function on these cars.

 

I understand about the 'vanes' helping the rotor cool, and that they should be directional, not straight. I meant the slots/grooves on the surface of the rotor itself. I've always thought that they let the brake dust and hot gas escape while braking, for a better bite.
On commonly-found rotors, some slots are straight, some are curved.
This site shows some different patterns on the rotor.
http://www.stasisengineering.com/braking.shtml

 

With the compounds used in todays brake pad there is barley any "gases" to worry about....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NegativeLift &raquo;</TD></TR><TR><TD CLASS="quote">

i think we dont hear about it much in production car racing because its seen as an advantage mainly on high downforce cars. I'm not sure if the bite function then becomes more important than the cleaning function on these cars.</TD></TR></TABLE>

Please explain because I still don't understand how it's supposed to create "bite" as you put it? Are you referring to creating More friction?

Any links about this, I'm curious. I've only heard of slotted rotors being there to remove debris / pad shedding, nothing else.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GreyTeg &raquo;</TD></TR><TR><TD CLASS="quote">Funny, I've never heard this. I thought it was purely for shedding pad dust and material.</TD></TR></TABLE>

can you "read" a freudian slip? i read this:<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GreyTeg &raquo;</TD></TR><TR><TD CLASS="quote">Funny, I've never heard this. I thought it was purely for shredding pad material.</TD></TR></TABLE>


nate

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1GreyTeg &raquo;</TD></TR><TR><TD CLASS="quote">

Please explain because I still don't understand how it's supposed to create "bite" as you put it? Are you referring to creating More friction?

Any links about this, I'm curious. I've only heard of slotted rotors being there to remove debris / pad shedding, nothing else.</TD></TR></TABLE>

Most define bite as the intial friction at the start of braking. If you look at a plot of friction coefficient vs. time, you can tell the characteristics of a pad/disc combo.

from the drawings ive seen, upon application of brakes the pad fills in the slot and impacts the edge, causing a normal force that is in the same direction as the pad/disc friction force. I'm sure this force is not very large and almost instantaneous, but from what I have heard it makes a difference. I dont have any data.

I don't have any links for you, but I have heard it from two manufacturers of racing brake discs. Of course, knowing the phenomenon is one thing, deciding if it benefits your application is the hard part.