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Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 27
Reg: 07-2009

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Tuesday, October 06, 2009 - 08:50 pm, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hello Folks,
I did the supra big brake upgrade last weekend and I am not sure whether the direction of the front grooves on the disc are right. Please anybody with this knowledge comment on the direction of the grooves?

Second left picture is Front right caliper and disc

http://www.soarerworld.com/forum/showthread.php?p=214709#post214709

Thank you
Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 28
Reg: 07-2009

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Tuesday, October 06, 2009 - 09:15 pm, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Front right caliper

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Steve Latimer
TryHard
VIC
UZZ32

Posts: 321
Reg: 07-2005

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Tuesday, October 06, 2009 - 09:29 pm, by:  Steve Latimer (Latsus) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have firsthand knowledge and experience on the direction of the grooves but it may be construed as sly and self serving so I guess that you will have to use the search function or consult a purportedly higher mechanical authority on the subject in question.
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

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Wednesday, October 07, 2009 - 09:11 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks for making my point Steve.

Raj, I haven't used those particular rotors, but all other slotted rotors that I have seen or used do go on the way that you have them.
Bobby Green
TryHard
QLD
TT

Posts: 383
Reg: 09-2005

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Wednesday, October 07, 2009 - 09:30 am, by:  Bobby Green (Nash) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)



Hope that helps.
Steve Latimer
TryHard
VIC
UZZ32

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Wednesday, October 07, 2009 - 10:45 am, by:  Steve Latimer (Latsus) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

After checking with RDA/EBC technical officer, the recommendations are as follows:-

"If you rotate the rotor in a CLOCKWISE direction and the slots/grooves/dimples/drilled holes angle to the left, then that rotor should be used on the right hand side of the vehicle"

The diagram above would indicate that you are looking OUT at (to the inner side of)the rotors from the middle of the vehicle.

Raj, I believe that your rotors are INCORRECTLY FITTED despite information to the contrary.

Peter Nitschke wrote on Wednesday, October 07, 2009 - 09:11 am:

but all other slotted rotors that I have seen or used do go on the way that you have them.


Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

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Wednesday, October 07, 2009 - 01:22 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think you will find that if you were able to look at the outside of the right hand rotor in the illustration, it would be the same as in the photo, the outside end of the slot goes to the front at the top,
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

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Wednesday, October 07, 2009 - 01:52 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It's probably more important to look at the internal vanes and see which way they flow.

The slots are usually cut in the opposite direction to reduce weakening the rotor.


Mike Dobkin
TryHard
Essex
Soarer TT

Posts: 214
Reg: 10-2008

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Wednesday, October 07, 2009 - 05:28 pm, by:  Mike Dobkin (Razman) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Judging from the cross drillings it looks like you have curved vanes and therefore mounted them the correct way round. Direction is dependent on the design of the disc - this diagram explains it very well ....

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Damian Ware
Goo Roo
Victoria
UZZ32

Posts: 1149
Reg: 10-2005

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Wednesday, October 07, 2009 - 06:27 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Really hard to see the angle of the vanes. They don't appear to agree with the slots but if I have worked out there position correctly you have them fitted backwards.
Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 29
Reg: 07-2009

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Wednesday, October 07, 2009 - 06:54 pm, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thank you everybody for responding

Steve Latimer wrote on Wednesday, October 07, 2009 - 10:45 am:

Raj, I believe that your rotors are INCORRECTLY FITTED despite information to the contrary.



Oh man it only gets ever more confusing. Some say I got it right and others contradict this.

Also I heard that the curved grooves are different from the straight grooves. Just like Peter said curved groves go against the direction of the internal vanes.
So the final question comes down to this, does the internal vanes (not the curved grooves) on the outside edge of a right side rotor point upwards or downwards w.r.t the centre?

Bobby Green wrote on Wednesday, October 07, 2009 - 09:30 am:




Peter Nitschke wrote on Wednesday, October 07, 2009 - 01:52 pm:



Also the internal vanes seems to be in opposite direction in these two pics above
Damian Ware
Goo Roo
Victoria
UZZ32

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Wednesday, October 07, 2009 - 07:05 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

The arrows in the bottom pic show the direction of airflow not the direction of the rotation.

Follow the top pic for the direction of the vanes relative to rotation.
Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 30
Reg: 07-2009

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Wednesday, October 07, 2009 - 07:19 pm, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Damian Ware wrote on Wednesday, October 07, 2009 - 07:05 pm:

The arrows in the bottom pic show the direction of airflow not the direction of the rotation.

Follow the top pic for the direction of the vanes relative to rotation.



Damian,
Looking at Peter's message about grooves (that the grooves on the rotor are against the vanes) and your message, can I take it that I got discs right?
Thanks
Mike Dobkin
TryHard
Essex
Soarer TT

Posts: 215
Reg: 10-2008

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Wednesday, October 07, 2009 - 07:30 pm, by:  Mike Dobkin (Razman) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Raj, Its easy to check. If you have curved vanes then your discs are correctly mounted - if you have pillars then they are wrong.

The slots will always be machined the other way to the vanes or they would simply fall apart. Yours discs are also drilled and for the same reason I'll bet that the holes do not follow the same direction of the vanes.
Damian Ware
Goo Roo
Victoria
UZZ32

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Wednesday, October 07, 2009 - 07:52 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mike I'm think that I have seen examples where the slot is machined in the same direction but the size and shape of the slot doesn't match the vane to insure it has solid backing. IE the slot would be 3 times greater angle than the vanes hence crossing over 3 vanes even though in the same direction.

Raj just use the vanes it is the only way to be sure, look into the rotors and see which way they go and make sure they match the pic.
Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 31
Reg: 07-2009

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Wednesday, October 07, 2009 - 09:11 pm, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ok guys got your point. Will check the internal vanes and fix the problem. Thank you very much for your advice.
Raj Somarouthu
Tinkerer
Scotland
Soarer V8

Posts: 32
Reg: 07-2009

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Friday, October 09, 2009 - 12:10 am, by:  Raj Somarouthu (Edinlexusv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ok guys, the mechanic came around today to swap the discs over but we found that the internal vanes are curved inwards towards the rears just like in the above pic from APRacing, so no need to swap as they are fitted right in the first place :-) This is a big relief for me!
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 10977
Reg: 11-2004

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Friday, October 09, 2009 - 09:35 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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