Peopleandcars Posted October 16, 2018 Share Posted October 16, 2018 (edited) Anybody has any experience with these? Just vented, no grooves Cost is about 60ish for fronts and 40ish for rear (BOSCH) on sale https://www.autodoc.co.uk/bosch/1166308 https://www.autodoc.co.uk/bosch/7991719 I trust the manufacturers as quality brands but wondered if anyone had fitted any at all? Edited October 16, 2018 by Peopleandcars Link to comment Share on other sites More sharing options...
Windymiller Posted October 17, 2018 Share Posted October 17, 2018 They seem to have part numbers that start with ‘986’, are you sure they’re right for a 987... ? Link to comment Share on other sites More sharing options...
MarkGTS Posted October 17, 2018 Share Posted October 17, 2018 They're a common part aren't they...? Link to comment Share on other sites More sharing options...
Peopleandcars Posted October 17, 2018 Author Share Posted October 17, 2018 3 hours ago, Windymiller said: They seem to have part numbers that start with ‘986’, are you sure they’re right for a 987... ? The one I ordered are the Ferodo parts Here you can see fitment is across 996/86 and 997/87 model range https://www.ferodo.co.uk/catalogue/7472/ferodo/premier/braking/brake-disc/ddf2020rc-1.pd.html Link to comment Share on other sites More sharing options...
Peopleandcars Posted October 17, 2018 Author Share Posted October 17, 2018 1 hour ago, MarkGTS said: They're a common part aren't they...? Yes they are blank ventilated discs. Link to comment Share on other sites More sharing options...
Peopleandcars Posted October 18, 2018 Author Share Posted October 18, 2018 (edited) Some very good reading about rotors and all things brakes... https://www.zeckhausen.com/catalog/index.php?cPath=6446_6514 https://blog.firestonecompleteautocare.com/brakes/5-brake-myths-busted/ http://www.stoptech.com/technical-support/technical-white-papers/brake-system-and-upgrade-selection Quote Myth #4: Wet rotors increase braking time. It takes about three times longer to break on wet roads than on dry roads, but not because any part of your brake system is damp. Any water on your rotor is going to get thrown off by the intense centrifugal force of the spinning wheels. As rain falls and mixes with oil, grime, and water, the roads become slicker, and you lose traction. Wet tires and roads cause increased braking time, not wet brakes. On wet or slippery roads, reduce your speed. Lower speeds will help you gain more traction as more of your tires’ tread will make contact with the road, notes Pennsylvania’s Teen Driver Education Program. Myth #5: Drilled or slotted rotors improve braking performance. Want to gain a real boost in braking performance? If you’re looking at drilled or slotted rotors, don’t…unless you’re an IndyCar driver. Drilled or slotted rotors will not improve braking performance on street vehicles, even if they do look really cool. Performance racecars sometimes use slotted rotors to help evenly distribute heat, but this technique decreases the life of the average rotor. Any slight performance boost you get from slotted rotors probably won’t outweigh the cost of replacing them more frequently. Edited October 18, 2018 by Peopleandcars Link to comment Share on other sites More sharing options...
Bushman Posted January 2, 2019 Share Posted January 2, 2019 Not sure I fully agree with the above statements. A wet disc at slow speed ( like driving through a flood) will not brake well until the pad has pushed all the water out from between it and the disc and then got a bit of heat back in there to boil off the rest, as water acts like a lubricant. under these conditions, vent holes or radial slots will give the water a quick route to be pushed into away from the pad surface quicker than being pushed to the outer edges where there is often a lip. once the discs spin up then yes, centrifugal force will throw water off the rotors. Vented discs also suck in air from the centre or in through these holes, the internal vanes acting like the compressor blades of a turbo that will then help throw the air outwards between the rotor plates to keep cool air flowing, taking moisture and contaminants with it. The very slight loss of disc surface area in contact with the pads over a solid flat disc is probably less than 3 or 4 percent. So technically, yes, there is a reduction in braking efficiency but the benefits of a quicker drying surface probably outweigh this small deficit. The next issue is not water but dust and grit. holes or slots will allow grit to be swept away by the leading edges of the pads into the holes before they get rammed in-between the pad and disc. I just cant believe that every car and bike manufacturer and race car company would go to the extra expense of drilling or machining rotors if they really didn't need to or there was no advantage in doing so. Just my thoughts though, with my engineering head on. Link to comment Share on other sites More sharing options...
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