I don't know much about these things, but they look directional and correctly installed to me.

 

[QUOTE]Originally posted by dwb1
[B]13" rotors will not fit in stock 16" or anyone's 16" wheels . Large calipers increase weight , but don't improve performance . They will increase pad life if pads are larger than four piston or 2 piston or one piston . Total surface area of all pistons on one side will determine clamping force on rotor not number of pistons .

 

There are two directional components - the slotting, and the venting. Unless I missed something, I can't even tell if the venting is directional in the first place. I'm pretty sure the slotting, however, is proper.

 

What I am looking at is internal vanes ,slots can be put on almost any way . If rotors have curved directional vanes the air enters in the center and gets expelled from outer spaces.

brad

 

Please explain

It's not just any S2000. It's seriously modified.

I think that's what a lot of farmers use

 

That's how my grandmother used to do it!!

 

From the picture Aus posted, those rotors definitely look installed correctly to me. Don't forget, often times magazines flip photos around so that they look better in print. . .

 

I thought that too, but do you remember the discussion with Luis about the Spoon rotors ? This later thread really get's into it. Their vanes are swept in one direction, so by your methods one is correct and the other is not. I went to a great deal of trouble to draw diagrams and all to illustrate this phenomena but was eventually convinced it was irrelevant. In fact, one of the external sources I asked was DBA, the manufacturer of the blanks for these rotors.

Ahhh, and on re-reading said thread I find a post by DBW [not to be confused with dwb1]:

So for these rotors to be backwards, then I assume the car is expected to do over 150mph in which case I understand the 6 spot calipers

 

The internal venting ribs is in the wrong direction from the look of the picture.
Brembo or AP had a detailed explanation on the correct direction of the internal ribs of the rotors on their web site.(but I forgot which one has it).
Assume you are looking at the right side of the car.(from the right of the car), looking at the front rotors.
The ribs should look like this:
****~ ~
******~ ~ <-------- ribs going this way
*******~ ~
******** -------> front end of car
*********| |
********* _____
********~ ####~
******~########~
******|###wheel###|
****** ~##center##~
********~######~
*********----------

To Aus2000, Your car and my car and that (highly modified S2000) all can go 150mph. A six-pot is way an overkill for a highly modified if lighten S2000) because lighter car needs less brake.
Anybody know where the explanation of the vane direction is please post the address of the web site.

 

What a coincidence, I was chatting to one of my friend about custome installing a AP Racing brake to my S2000 about 3 hours ago. This is exactly what I would do. but, I will buy a disk size that I want out of a catalog. I don't think I want to make one myself. otherwise, this looks really cool. I will opted a 4-pot instead of 6 pot caliper. Just for the price concern.

according to this picture the disk is defintely backward.


The direction of the slot does not matter that much. It is the internal vent that really matter. As the disk spin forward, it should direct the air out of the hub, not into the hub.

also, Brembo is good stuff, but most of them are not aluminum. If you get a AP Racing Caliper. It is made out of Alunminum. Like the one on my BMW. It is not heavy at all. It is actually lighter than my stock BMW caliper. Also, the aluminum center cap for the brake rotor further reduce the weight of the spinning mass. All in all, you might not get a heavier setup. I think for me, it is the same weight (stock vs. AP setup). remember the density for aluminum is roughly 1/3 of the steel or cast-iron. which means it takes 3 times the volume of steel or cast-iron to equal the same mass of aluminum.

here is an example of the right directional rotor out of my BMW. Both picture are out of the same corner. As you can see the direction of the vent is the opposite as the one from above.



If this is not enough, go to your local Porsche dealer and check it out. That should definetly solve our problem.