Fitting slotted and drilled discs

When fitting drilled and slotted discs does it matter which way you fit them? does the diagonal line of the slot or drilled hoes go \ or / with direction of rotation?

You can only put them on one way cant you???

/ goes with rotation but as Dopey said i think they only go one one way !!

Well obviously they only fit one way. They come as a pair for each axle but you can put they either way round. i.e. the diagonal line of holes or the slot leading in to the rotation or trailing from it. I can't see it matters which way but thought someone would know.....

Have a look at a sports bike or one of those EVO VII to see what is the normal way. I would imagine that they should be sucking air in the slots and out the holes, that is the slot going diagonally forwards in the direction of rotation.

if you look at the discs the grooves always go in the direction of rotation,no matter which side of the car you fit them.

I think that with internally vented discs, the air is normally drawn in at the hub and thrown out by the centrifugal (or is it centripetal) force.

Anyway, check out this pic:

http://www.gglotus.org/ggrace/exigesport/exige1.jpg

Jock

Most definately:

http://images.eurotuner.com/featuredvehicles/160_0706_et_24_z+2006_vw_gti+brembo_brake_kit.jpg

The ones i've fitted on cars were sposed to face forward but i did fit the first set facing backwards and TBH i didn't notice any differance when i changed em over
Mind i may have if i pushem em real hard either way once i read the instructions i changed em to facing forward

Sheard said:

When fitting drilled and slotted discs does it matter which way you fit them? does the diagonal line of the slot or drilled hoes go \ or / with direction of rotation?

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Just a question. Why would anyone in their right mind spend a fortune on slotted vented discs, when the standard ones that cost very little by comparison, are more than adiquate for the job?

to the last poster- have you ever tried towing a proper trailer or caravan or for that matter porlock hill, I've had serious brake fade within 2 miles using the gearbox and brakes as little as possible.

P38 brakes as standard are crap

Funny,

I just towed a 3 tonne mini digger 100 miles over sh*t Irish back roads and could not fault my 98my DSE one bit, particularly the brakes, mind you I didn't cross 45 mph. I'm not sure if there is a difference between the auto and manual in braking terms but I've found my standard (auto) brakes to be one of the better characteristics of the Rangie.

It was actually the most impressive tow I've ever done, the P38 was far superior to anything I've ever towed with before (Landcruiser, RRC(200tdi/3.9), Pajero, L200, hilux, Cherokee) in everything bar power where my chipped Dse was adequate and only the RRC(3.9) and Landcruiser (brilliant engine) pulled better.

If you're getting fade after 2 miles with a caravan you'd want to check out your braking system. I'd guess you've glazed the brakes or your discs are in need of replacement (worn discs heat up more than new ones). It would be well worth doing a detailed inspection and overhaul.

what i said was if you drive it like you stole it-two miles and either a classic or p38 will suffer brake fade- new disks,pads and rave fluid change on several RR it's the same

secondly driving on ****ty roads in no way compares to lynton and lynmouth at 60-70mph and porlock hill with or without trailer or caravan.
[ame="http://www.youtube.com/watch?v=_xpyBt1PmYQ"]YouTube - A39 Porlock Hill[/ame]

fanatic said:

what i said was if you drive it like you stole it-two miles and either a classic or p38 will suffer brake fade- new disks,pads and rave fluid change on several RR it's the same

secondly driving on ****ty roads in no way compares to lynton and lynmouth at 60-70mph and porlock hill with or without trailer or caravan.
YouTube - A39 Porlock Hill

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porlock hill is a monster,i went up that in my mini with a bigger engine in it but knackered.i used a gallon of oil just getting up the bugger,happy days.

wammers said:

Just a question. Why would anyone in their right mind spend a fortune on slotted vented discs, when the standard ones that cost very little by comparison, are more than adiquate for the job?

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I'm with you!

What a waste of money those fancy discs are!
But they are fashionable, and so there's a "feel good" factor for a lot of people. What makes me feel good is leaving my money in my pocket ready for necessary purchases.

Discs ... they create HEAT when they convert the kinetic energy of the moving vehicle into HEAT energy. Basically, the more metal there is in the discs, the better off your brakes will be, because there's more of them to absorb and then dissipate the heat..

The cooling ability of ventilated discs and slotted ones has about ZERO effect until long after you had to do the the quick stop. It only starts to work after you get back up to speed, and have the wheels and discs rotating. DURING the stop what stops the brakes from failing is the sheer mass of metal - MORE is BETTER!

NOTHING in common use stops cars as well as good old CAST IRON discs. Grey austenitic cast iron, and cheap as dirt too. The WEAR properties and FRICTION properties of cast-iron discs are second to none, and amazingly they very seldom warp even after becoming red hot many times.

The discs on my Disco 2 are coming up for 70k miles and they look like new. I bet there are Discos out there with original discs at over 200 k miles.

CharlesY

Hi landy lovers.. I just fitted some slot + groove to my p38.. i got them from paddock spares and they are great... oh and in the instructions they say that the groove (if your looking at the off side with the front of the car on your right ) gose \ this way..............

fanatic said:

to the last poster- have you ever tried towing a proper trailer or caravan or for that matter porlock hill, I've had serious brake fade within 2 miles using the gearbox and brakes as little as possible.

P38 brakes as standard are crap

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Yes many times. Porlock hill a few times also. I suggest you get someone to look at your "proper trailer or caravan for that matters" brakes. They should be braking the trailer or caravan not the towing vehicles brakes. The brakes on my DSE are superb. There is no need whatsoever to spend on cosmetic frills when the stadard units (If properly maintained) are more than adiquate for the job.

Jesus loves you but I think you are a ****, having level 3 nvq motor vehicle and years a go working in a garage that serviced and specialized in classics-you are talking ****. the brakes on range rovers are as good as the old sd1

fanatic said:

Jesus loves you but I think you are a ****, having level 3 nvq motor vehicle and years a go working in a garage that serviced and specialized in classics-you are talking ****. the brakes on range rovers are as good as the old sd1

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Is you having a level 3 paperwork qualification supposed to impress me? I trained as a mechanic when they actually repaired things, not just took a bit off and replaced it with a new one. I repeat the brakes on my DSE are superb, it tows and stops a 2 1/2 ton boat without any problems, with the help of properly maintained trailer brakes that is. But if you insist on doing 60-70 mph around Lynton and Lynmouth then maybe you need race brakes. There was no need for the implied insult, you maybe interested to learn that i think nothing of you whatsoever. Maybe when you have graduated to more than the ability to change oil, your your views will be taken a little more seriously.

wammers said:

Is you having a level 3 paperwork qualification supposed to impress me? I trained as a mechanic when they actually repaired things, not just took a bit off and replaced it with a new one. I repeat the brakes on my DSE are superb, it tows and stops a 2 1/2 ton boat without any problems, with the help of properly maintained trailer brakes that is. But if you insist on doing 60-70 mph around Lynton and Lynmouth then maybe you need race brakes. There was no need for the implied insult, you maybe interested to learn that i think nothing of you whatsoever. Maybe when you have graduated to more than the ability to change oil, your your views will be taken a little more seriously.

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well said,no need for insults in this type of thread.