Slotted rotors

[bigg_vin]

hey peoples,

i just fitted DBA slotted discs to the VH....

now, they had a "left" and a "right" marked on them.I fit the "left" to the passanger side.

now, i had a look at some other people slotted discs, and some people have the slots going the opposite way to me.

mine is rotating the way the picture shows.

cheers

[cxcxcxvcvcvc]

i think they meant left and right faceing the car from the front bonnet not from driver position because they are faceing the wrong way (im pretty sure dont quote me) as far as i was aware the slots where suposed to face the other way so when you brake the slots are going against the pad not with it

[bigg_vin]

yeah, thats what i was tossing up... cos i figured that if they were facing the other way, then they would stop better cos the whole face of the slot hits the pad.....

why the hell would they put a L and R on it and not conclude that you need to look at the car to determine what side is what...... a P and D would make more sense......

thanks mate, ill change em round.....

[vkberlina]

Heres a pic of the brakes I used to have on my VK. Passengers side shown.

Also if your diagram is for the passengers side shouldnt the caliper be on the front and not the back ??

[atrail308]

L always mean passenger side, R is always Drivers side...

[bigg_vin]

now i am confused.... my picture that i drew was not of any certain side... it was just to show which was my discs are installed in relation to the caliper and the rotation of the wheel.

i have mine installed like the picture of the vk..... but according to the first reply, this is incorrect....

thanks

[Sammy]

i reckon you got yours right, as when i got a hoppers stoppers kit it comewith the same disc marking and the calipers also came with a left and right marking, and obviously with the caliper you need to get it on the right side to get the bleed valve at the top, and to do all this i ended up with mine facing the same as vkberlinas pic.

right hand side of the picture is the front of the car.

[brocke8]

R is the drivers and L is the passangers.

Going by the diagram you have drawn its right.

[bigg_vin]

so the large face of the slot is not meant to come into contact with the pad all at once..... cheers

[craigvk]

Ooooh nice and shiny.

[Ragnarok]

Hope this helps. off the brembo website.

Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are three vane types in use:

* Straight
* Pillar vane (comprised of many small posts)
* Curved vane

The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Please see figure. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc's ability to dissipate heat.

Additionally, all of Brembo's slotted discs are directional as well, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first.

I put this in as i just went through the same thing when putting on RDA slotted rotors and in my eagerness to pull them out of the boxs and look at my shiney new disks mixed them up. i ended up going the slot nearest the outer edge of the disc contacts the pad first. brakes been on months no prob. RDA disks use a pillar vane. althou they call it kangaroo paw. " The ‘Kangaroo Paw’ design features a series of 144 diamond and tear drop shaped pillars and columns, individually spaced between the rotor faces."


Ragnarok.

[bigg_vin]

so going by that....

i have mine the wrong way round, and so do you Sammy.....

[J_D]

well mine are on the same way as well.

[Ragnarok]

guys.. read the post.... pillared vanes are non-directional



so which everway gets your rocks off.

[stevegunn]

I think the slots are supposed to "tip" forward if ya know what I mean.
As if catching air?
So as I see it the pics are wrong way around, but then I thought was wrong once, but I was mistaken!
Then again I have seen rotors with slots going both ways as well so who really knows hey

[Ragnarok]

Last time......

Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation...................

[stevegunn]

OK, just did abit of reading and it seems some are different to others, dont know why, vt tip forward and by the look of it vb-vp go the other way? got me stuffed why that is. anyway check this out if ya wanna know some more. http://www.pbrperformance.com.au/doc...ions-PL745.pdf

[stevegunn]

Forgot to mention you guys have them on the right way "for your model"

[craigvk]

As Ragnarok says, do what you like. Doesn't matter.

If it bothers you, go with stevegunn's tip and do the modern VT way.

[Sammy]

this picture is from another little project i have been working on, these are the dba slotted and drilled (vented) rotors and as you can see the slots go both ways, so you would think if it really mattered which way then they wouldn't slot it like this.


for the record this is VP V8 rotor with vr/vs caliper, same as VP V8 caliper, i also believe vl turbo and fe2 vn's had these ?

[craigvk]

If I was to get new rotors, what would I choose for my V8 VK? Standard, slotted or slotted/drilled? What would be the benefits of the three?

[SL/ENUT]

They say the crossed drilled rotors are prone to crack. Me personally i would get slotted rotors.

[atrail308]

slotted are the way to go, for the VK V8, use DBA DIB015...

[Sammy]

yeah i would go for the slotted too, the cracking you would probably only see in a race application, but the fact the slotted rotors are rated for racing and the drilled ones arn't is good enough reason ... when i ordered the above pictured rotors there was a 2 month wait for slotted or slotted and drilled were available for no extra cost, so i figured why not!

[vkberlina]

I suggest you buy Slotted, I cracked my first set of rotors which were cross drilled, I them picked up my HDT V8 slotted rotors and calipers (Up for sale by the way), now im running VZ Monaro brakes. I eventually will get slotted rotors if I require it again.

cheers
Scott