Bazza Posted April 16, 2007 Report Share Posted April 16, 2007 grooved dimpled grooved and dimpled drilled grooved and drilled with all these choices what does anyone think is better Quote Link to comment Share on other sites More sharing options...
jon Posted April 16, 2007 Report Share Posted April 16, 2007 Stock ungrooved. All you'll do on a road car with dimples and grooves is eat through pads quicker and give yourself extra dusty wheels. Drilled discs will nearly always surface crack around the holes as they're drilled not cast in (unless you get porsche discs) Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 16, 2007 Author Report Share Posted April 16, 2007 Stock ungrooved. All you'll do on a road car with dimples and grooves is eat through pads quicker and give yourself extra dusty wheels. Drilled discs will nearly always surface crack around the holes as they're drilled not cast in (unless you get porsche discs) ah but this will be on a track car the more cooling the better, the idea is to improve the braking, if new pads are needed more often so be it and brake dust shows the real men Quote Link to comment Share on other sites More sharing options...
jon Posted April 16, 2007 Report Share Posted April 16, 2007 Just slotted then, the rest just weakens things. Get carbotech europe to make some xp8s for your caliper if it's a trackcar, mind blowing pad. Quote Link to comment Share on other sites More sharing options...
Sam@TDi Posted April 19, 2007 Report Share Posted April 19, 2007 Personally I'm a fan of giving the brake pads as much disc surface to contact as possible. Friction is a straight function of pad compound vs disc compound x pad to disc surface area (it goes without saying contact pressure is all important as well) If the thermal capacity of the disc isn't large enough then by far and away the most effective way of increasing it is to make the disc bigger. In my opinion messing about with slots and drilling holes is just an emergency measure, and reletively speaking makes little difference to disc's real ability to absorb kinetic energy and then radiate it as heat energy, in this scenario size really matters :rolleyes_anim: Quote Link to comment Share on other sites More sharing options...
Tony Posted April 19, 2007 Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 19, 2007 Author Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Quote Link to comment Share on other sites More sharing options...
Tony Posted April 19, 2007 Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 19, 2007 Author Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them Quote Link to comment Share on other sites More sharing options...
Tony Posted April 19, 2007 Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them A missing question was why did you feel the need to up-grade the friction? Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 19, 2007 Author Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them A missing question was why did you feel the need to up-grade the friction? was a need in wanting to be able to stop with upgraded power the brakes are starting to get jealous Quote Link to comment Share on other sites More sharing options...
Tony Posted April 19, 2007 Report Share Posted April 19, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them A missing question was why did you feel the need to up-grade the friction? was a need in wanting to be able to stop with upgraded power the brakes are starting to get jealous Poxy brakes.... you did the right thing.... Jealousy has no home when the powerhouse is in charge..... Quote Link to comment Share on other sites More sharing options...
jon Posted April 19, 2007 Report Share Posted April 19, 2007 Stop quoting each other! It messes up my instant notification and I can't see the rest of the post in email Quote Link to comment Share on other sites More sharing options...
Janey Posted April 20, 2007 Report Share Posted April 20, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them A missing question was why did you feel the need to up-grade the friction? was a need in wanting to be able to stop with upgraded power the brakes are starting to get jealous Poxy brakes.... you did the right thing.... Jealousy has no home when the powerhouse is in charge..... Stop quoting each other! It messes up my instant notification and I can't see the rest of the post in email Sorry Jon :) Couldn't resist Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 20, 2007 Author Report Share Posted April 20, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Yeah.. surely the smaller disk will be rotating faster allowing more friction..... despite the smaller surface area. The down side would be the venting so adding drills seems logical to me....? surely disc speed is governed by the speed of the vehicle/wheels/etc the bigger disc would mean more frictional area allowing lower temperature build up supposidly grooves allow temperatures to disperse hopefully lowering them A missing question was why did you feel the need to up-grade the friction? was a need in wanting to be able to stop with upgraded power the brakes are starting to get jealous Poxy brakes.... you did the right thing.... Jealousy has no home when the powerhouse is in charge..... Stop quoting each other! It messes up my instant notification and I can't see the rest of the post in email Sorry Jon Couldn't resist thats a bit naughty janey Quote Link to comment Share on other sites More sharing options...
Sam@TDi Posted April 20, 2007 Report Share Posted April 20, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Thanks! I think... if the disc diameter is limited then you've got 2 options ..... 1. make the pad and the disc out of materials which will continue to operate properly even when extremely hot (think Porsche style silicone carbide disc's and ceramic pads) 2. make the disc wider. The more disc material there is in total then the larger it's thermal capacity. A bit like a large body of water, steel has a latent heat capacity so for a certain time governed by it's mass it'll absorb energy and not actually increase in temperature. This is of course making the huge assumption that the problem you have is that your brakes are over heating. If the problem is simply insufficient friction that can easily be sorted by selecting an appropriate pad compound, for example the ultra aggressive carbon metallic that Jon runs. Remember F1 cars run on 13" rims and can pull 4.5g in a braking moment, aanndd keep that up for 1.5hrs, so wheel size is no real excuse I'm afraid...... money however is a good excuse Quote Link to comment Share on other sites More sharing options...
Bazza Posted April 20, 2007 Author Report Share Posted April 20, 2007 He's so clever isn't he........ Bazza shall we duff him up . . . . . . . Four bottles of duff should do it noooo ...................he is far too good looking for that, ..............................deserves far worse he didnt mention what happens when you are limited by wheel size went for grooved and dimpled , little bit of function and they look pretty Thanks! I think... if the disc diameter is limited then you've got 2 options ..... 1. make the pad and the disc out of materials which will continue to operate properly even when extremely hot (think Porsche style silicone carbide disc's and ceramic pads) 2. make the disc wider. The more disc material there is in total then the larger it's thermal capacity. A bit like a large body of water, steel has a latent heat capacity so for a certain time governed by it's mass it'll absorb energy and not actually increase in temperature. This is of course making the huge assumption that the problem you have is that your brakes are over heating. If the problem is simply insufficient friction that can easily be sorted by selecting an appropriate pad compound, for example the ultra aggressive carbon metallic that Jon runs. Remember F1 cars run on 13" rims and can pull 4.5g in a braking moment, aanndd keep that up for 1.5hrs, so wheel size is no real excuse I'm afraid...... money however is a good excuse opted for the mintex 1144 pads with braided hoses and new discs, hopefully should feel some benefit and yes i will go for the optional money excuse Quote Link to comment Share on other sites More sharing options...
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