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Location:
Mentone
Registered:
May 2002
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Slotted rotor direction
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Mon, 13 September 2004 22:19
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Which way should the slots in my rotors go. Should they go from the inside towards the back of the car or from the inside fowards? I have checked out a few different cars and there seems to be no definate answer? Does it matter?
Brad
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Location:
Melbourne
Registered:
May 2002
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Re: Slotted rotor direction
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Mon, 13 September 2004 22:24
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brad,
inside fwd - as per my mr2
ps i have your jack in the shop waiting for you
T
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Location:
Adelaide
Registered:
July 2002
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Re: Slotted rotor direction
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Mon, 13 September 2004 23:23
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is it worth having rotors slotted? does it make a noticeable diff?
Cheers
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Slotted rotor direction
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Mon, 13 September 2004 23:30
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The point of slotting is to give any air that could be trapped between the pads & the disc somewhere to escape to.
This was the original theory behind cross drilling, but this creates a weak path across the disc.
The edge of the slot also helps to scrape any foreign material off the pad.
I haven't been able to tell as I've never gone from a non-slotted to a slotted of the same size. I've upgrading the calipers & disc size at the same time, so not a level field to compare on.
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Location:
Brisbane
Registered:
May 2002
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Re: Slotted rotor direction
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Mon, 13 September 2004 23:45
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It's unlikely you'll notice the difference unless you're giving your brakes a really hard time, ie circuit racing or a "spirited" blat through the mountains. Having said that, if you're buying new rotors it's usually only a few bucks extra to get the slotted versions, so why not?
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Location:
Rosanna, Melb
Registered:
June 2002
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Re: Slotted rotor direction
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Tue, 14 September 2004 07:56
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My DBA slotted said to fit so that the slots went one way, but I have seen cars on the road (HSV with premium brakes is the only particular model which sticks in my memory) with the slots heading the other way.
My conclusion: it doesn't matter at all.
Hen
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Location:
Newcastle NSW
Registered:
June 2002
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Re: Slotted rotor direction
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Tue, 14 September 2004 09:27
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i dont have slots these grooves work well and look sweet too
 
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Location:
Sydney
Registered:
May 2002
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Re: Slotted rotor direction
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Tue, 14 September 2004 12:07
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Slots don't necessarily dictate the direction of rotor travel - ie on vented rotors, the cooling vanes dictate which way the rotor should spin to assist cooling ; different rotor manufacturers have the slots running different ways for different reasons - always check the manufacturer's recommendation.
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Location:
Perth
Registered:
July 2004
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Re: Slotted rotor direction
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Tue, 14 September 2004 12:11
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I thought that the idea behind slots and drilling is for when you get brake fade. Correct me if im wrong as i always seem to be, but this is the temperature at which the glue binding brake pad material together turns into gas. this gas forms a layer between rotor surface and pad therefore lubricating. we all have had that feeling of 'oh s**t' when we first got our licenses.
These grooves give the gases an escape route so pad can once again create friction with disc. This is what qualifies a quality brake pad from a supercheap brake pad, the temperature at which the glue sublimates. This heat problem runs into the brake fluid also doesnt it? high temp/non boil/dot 5 whatever fluid?
Its what I thought anyway 
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Location:
Brisbane
Registered:
June 2003
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Re: Slotted rotor direction
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Tue, 14 September 2004 12:12
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The other main reason for slots (probly the biggest) is for disssipation of brake pad dust...
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Location:
Adelaide
Registered:
May 2003
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Re: Slotted rotor direction
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Tue, 14 September 2004 12:45
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Yeah, dissipate it all over my wheels.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Slotted rotor direction
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Tue, 14 September 2004 13:25
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Supralux, thats basicaly what the BDA dude told me at a training night. except he said the slots where mainly to 'wipe' the pad clean more than get rid of the gasses (which was the cross drilled holes job).
their new 'Kangaroo paw' internal cooling design looks rather trick, is spose to help cooling of the rotor much better than the old vane type.
and the new 2 part rotors with aluminium hat are very nice indeed. 
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Location:
Adelaide
Registered:
May 2003
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Re: Slotted rotor direction
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Tue, 14 September 2004 22:59
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Although i have heard nasty things about the hats stress fracturing on the 2piece DBA ones.
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