Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Grooved / Drilled Disc Orientation
- kis
- Lifer
- Posts: 4536
- Joined: Wed Jul 20, 2016 2:33 pm
- Location: Surrey / West Sussex Boarder
Grooved / Drilled Disc Orientation
Okay so as above, after peoples opinion on grooved or drilled disc orientation (obviously includes dimpled discs too). This is also only for discs that are straight vented. Some vents travel in a specific manor to increase airflow and this can only be installed in one direction. However the majority of discs are grooved/drilled and have no specific vent direction... so after opinions or just response via poll. I'm saying this because typically you have a brake caliper set up at the "front" of the car... the Zed has the caliper sat towards the "back". Cheers guys
Front of the car ----> Pic of john-z4's car... just a random shot I found!
ANTICLOCKWISE DIRECTION --------------------------------------- CLOCKWISE DIRECTION
(starting at the centre and moving outwards)
Front of the car ----> Pic of john-z4's car... just a random shot I found!
ANTICLOCKWISE DIRECTION --------------------------------------- CLOCKWISE DIRECTION
(starting at the centre and moving outwards)
My E85 Z4 3.0i SMG
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
- dhobbs
- Senior Member
- Posts: 1621
- Joined: Mon Jul 16, 2012 5:33 pm
Grooved / Drilled Disc Orientation
What is the exact purpose of drilled/groved discs?
Is it to clear the brake dust and any hot gases produced under heavy braking? If so, then I will go with the picture on the left.
Is it to clear the brake dust and any hot gases produced under heavy braking? If so, then I will go with the picture on the left.
3.0si roadster. Requisite stubby. Sound gen mod. LED numberplate lights. LED boot strip. Interior lights LED too. ZHP gearknob. Daily drive
Motor in boot. Bilstein B8 dampers. New radio, much better sounds
Motor in boot. Bilstein B8 dampers. New radio, much better sounds
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Grooved / Drilled Disc Orientation
Yes, pad gassing primarily. I'm not sure it makes a lot of difference which way the grooves run but the generally excepted way is for the groove to hit the pad on the inner radius first, so assuming the caliper is at the front of the car on your pics, the right one is correct.
Saying that, a great many brake discs are not sided so the left runs the opposite way to the right.
Saying that, a great many brake discs are not sided so the left runs the opposite way to the right.
- bradz
- Member
- Posts: 455
- Joined: Thu Jul 11, 2013 6:26 pm
- Location: Bedford
Grooved / Drilled Disc Orientation
Isn't it more important that the scoops within the disc are dissipating the heat?
Z4M Coupe, E92 M3, E46 M3 Track car
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Grooved / Drilled Disc Orientation
Yep, that's the only thing that I would consider important.
- Steve84N
- Senior Member
- Posts: 1828
- Joined: Tue Jul 21, 2015 1:00 pm
Grooved / Drilled Disc Orientation
Some discs tell you to put them on one way and some the other so it can't matter too much. The inner vanes are more important as you say. Many race cars run them with what seem to be the grooves running the 'wrong way'.
Drilled have just as many problems as benefits with cracking around the holes. It's as much about looks as anything as pad gasses aren't the problem they once were.
Grooves help keep the pad surface fresh and consequently wear pads faster.
Race cars run plain or grooved on the whole. Heat capacity is better with plain but it's marginal as not much is carved out. The holes/grooves aren't for cooling, the inner vanes are though.
Drilled have just as many problems as benefits with cracking around the holes. It's as much about looks as anything as pad gasses aren't the problem they once were.
Grooves help keep the pad surface fresh and consequently wear pads faster.
Race cars run plain or grooved on the whole. Heat capacity is better with plain but it's marginal as not much is carved out. The holes/grooves aren't for cooling, the inner vanes are though.
C63 AMG Estate 6208cc
- kis
- Lifer
- Posts: 4536
- Joined: Wed Jul 20, 2016 2:33 pm
- Location: Surrey / West Sussex Boarder
Grooved / Drilled Disc Orientation
50:50 ! Anyone else?
My E85 Z4 3.0i SMG
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
- Buckz
- Senior Member
- Posts: 1112
- Joined: Mon Dec 05, 2016 11:00 am
- Location: West sussex
Grooved / Drilled Disc Orientation
I'd put them the "correct" way round simply due to OCD. I can't think of any technical reason.
IMO only the center vents are important.
IMO only the center vents are important.
- kis
- Lifer
- Posts: 4536
- Joined: Wed Jul 20, 2016 2:33 pm
- Location: Surrey / West Sussex Boarder
Grooved / Drilled Disc Orientation
I know what you mean but there's no strict right or wrong way. But according to the stats 50% will think they're on correctly, with the other 50% thinking what a douche, he's got them on the wrong way round! I was hoping for something like 70:30 split to help me decide!
My E85 Z4 3.0i SMG
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71
-
- Member
- Posts: 491
- Joined: Mon Oct 16, 2017 1:53 pm
- Location: Windsor
Grooved / Drilled Disc Orientation
Directional with the wheel, reason being.
Less noise, grooved discs can be too noisy and sound corroded. More noise = More energy wasted = less efficiency = more prone to that lovely crack these things produce.
Imo anyway, Never had any joy with grooved and drilled discs.
Less noise, grooved discs can be too noisy and sound corroded. More noise = More energy wasted = less efficiency = more prone to that lovely crack these things produce.
Imo anyway, Never had any joy with grooved and drilled discs.
MR-2 Turbo Rev2
Yep no Z yet. On the hunt.
Yep no Z yet. On the hunt.
- TomK
- Senior Member
- Posts: 2363
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Grooved / Drilled Disc Orientation
I just mount mine as AP say to do
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage