Which way to mount rotors?

[S4evr]

bored at work, so i made these up in Solidworks real quick.. just picked up some ecs slotted rotors, which way do i mount them?

[s2the4]

Emil I believe you can mount them either way but the top picture I believe is correct. If you run them the opposite way it will just wear the rotor quicker than it should but it wont be disastrous.

[Rated S]

If they are rotating clockwise in these pictures, then the top is correct.

[S4evr]

think of the brake assembly i have pictured mounts on the driver side (in both cases) which means they would be spinning CCW.

[onemoremile]

You can't tell anything whatsoever from the pictures. What determines the orientation are the cooling vanes in the rotor. They are what move the air and get the job done. Slots have nothing to do with it and different manufacturers do it different ways.

[ProJect_*A4*]

Read the bottom of this page
http://a4mods.com/index.php?page=web...ages/b5s4.html


SO, that means, if that lower picture is your left front rotor and it would rotate counter clockwise while driving FORWARD, you have them on correct.

[NoLeafClover]

top pics is correct

[S4evr]

two different answers!! lol, i dont think it matters too much in the end.

[onemoremile]

Again, manufacturers cut slots both ways. What really matters is the internal layout of the rotor. If they have straight vanes it doesn't matter. Otherwise they are mounted so that air flows from the inside to the outside. The reason that link says it is so important to face the drilled rotors the correct way is because the vanes control how they are drilled. Again, it all comes down to the internal vanes. That is what cools a rotor.

The slots are 99% cosmetic and don't really matter. They are theoretically there to cut the gas "pad" between the pad and rotor but that hasn't been an issue in decades. The only pads that really create that gas "pad" are race pads and that gas needs to be there otherwise the rotors get trashed very very quickly. I ran drilled and slotted rotors on the track and filled all the little holes and slots with expensive ceramic pad material which left them completely useless anyway.

[onemoremile]

Off topic, SW08 is crazy cool. I've used every version since 99 and this is by a wide margin the largest improvement/change they've ever made. Took a while to get used to the new layout but it is awesome. Cartoon cad got even better.

[KompMan420]

Yea, what he ^^ said. I've actually got the fronts going one way and the rear going a different way. Follow the veins, not the slots

[S4evr]

yea sw08 is great.. I work for SolidWorks and all i can say is just wait for 09 :-)

[S4evr]

BTW, i think my internal veins are straight cut, but will check once im home

[KompMan420]

Most are straight. You'll usually know based on the price you paid. I don't think ECS carries anything with angled veins for stock replacement. DBA and possible STaSIS are some of the few I can think of.

[audispeed]

when the vanes are straight it doesnt really matter. when they are angled, stoptech at least recomends, that the vanes angle rearward at the top.

[SourDieselS4]

Mine came with nice R and L stickers on them

[ProJect_*A4*]

hah, same here... Stickers are a good thing =]

[NogaroWonda00]

what do you do for work s4evr?
ive never used SW but im going to school and have taken adobe and revit classes looks good though lol

[S4evr]

im a mech. engineering student at RIT, working at solidworks part time right now

[NogaroWonda00]

oh thats cool i really want to do something with CAD, is SW somewhat like inventor? (if you have used it) i need to get done with my pre recs before i start making life changing decisions lol

[S4evr]

inventor, pro-e, all kinda the same