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Blown86 Regular Location: Perth Registered: July 2002	Re: Should I get cross drilled rotors? Sat, 07 June 2003 09:43 toycelica77 wrote on Fri, 06 June 2003 15:20 Blown86 wrote on Thu, 05 June 2003 19:51 Braking effort is only determined by clamping force and the coefficient of friction of the pads and disc. what about rotor size? apart from bigger surface area, the length of the braking arc is increased therefore allowing for greater breaking force to be applied... are you saying small rotors with the same braking area as fuckin huge rotors will brake the same? if this is the case, why do bikes have huge rotors? and not small rotors with calipers rated at the same clamping force? in response to the orginal topic - cross drilling on street car is kinda pointless, unless your going for 'show-factor' Making rotors larger just increases the mass of metal able to be used as a heat sink. Breaking force remains the same but maximum braking force can be maintained for longer before the brake temperature exceeds the maximum operating temperature of the system. Bikes have large diameter but very thin rotors to maximise the heat sink available for the least weight, possibly for looks and brake lever feel as well. Cross drilling does not really provide cooling improvements as some manufacturers like to claim. It only really reduces mass and therefore unsprung weight and helps remove the pad boundary layer. From tests I've done in the past on open wheeler race cars, the only advantage was that cross drilled dics cool down faster when the car is stationary. [Report message to a moderator]

	Subject	Poster	Date
	Should I get cross drilled rotors?	Purple_Beasty	Thu, 05 June 2003 07:43
	Re: Should I get cross drilled rotors?	Cool1	Thu, 05 June 2003 08:01
	Re: Should I get cross drilled rotors?	manipulate	Thu, 05 June 2003 08:03
	Re: Should I get cross drilled rotors?	Blown86	Thu, 05 June 2003 09:35
	Re: Should I get cross drilled rotors?	manipulate	Thu, 05 June 2003 09:37
	Re: Should I get cross drilled rotors?	route__666	Thu, 05 June 2003 08:52
	Re: Should I get cross drilled rotors?	Classique71	Thu, 05 June 2003 09:01
	Re: Should I get cross drilled rotors?	Purple_Beasty	Fri, 06 June 2003 07:07
	Re: Should I get cross drilled rotors?	Blown86	Thu, 05 June 2003 09:51
	Re: Should I get cross drilled rotors?	toycelica77	Fri, 06 June 2003 07:20
	Re: Should I get cross drilled rotors?	Blown86	Sat, 07 June 2003 09:43
	Re: Should I get cross drilled rotors?	trent_kershaw	Sat, 07 June 2003 11:45
	Re: Should I get cross drilled rotors?	ed_ma61	Sat, 07 June 2003 13:14
	Re: Should I get cross drilled rotors?	Norbie	Thu, 05 June 2003 10:24
	Re: Should I get cross drilled rotors?	M.J.H	Fri, 06 June 2003 01:53
	Re: Should I get cross drilled rotors?	fingers	Fri, 06 June 2003 02:12
	Re: Should I get cross drilled rotors?	crazy_camry	Fri, 06 June 2003 11:17
	Re: Should I get cross drilled rotors?	toycelica77	Sat, 07 June 2003 23:52
	Re: Should I get cross drilled rotors?	ed_ma61	Sun, 08 June 2003 03:26
	Re: Should I get cross drilled rotors?	SUPRAGTE	Sun, 08 June 2003 12:24

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