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Old 11-14-2010, 03:06 PM   #1
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Default are cross drilled/slotted rotors lighter then factory ls1?

Looking to lose some weight but can't go drag since it's a street car. I already have a tube frontend,so i'm loking at the brakes. If they are lighter,how much?? Thanks, mike c.
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Old 11-14-2010, 05:53 PM   #2
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Looking to lose some weight but can't go drag since it's a str eet car. I already have a tube frontend,so i'm loking at the brakes. If they are lighter,how much?? Thanks, mike c.
yes the bear rotors are lighter and better made and wont warp.
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Old 11-14-2010, 06:24 PM   #3
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I have a hard time believing that drilled/slotted rotors WONT warp. Anything drilled is more prone to cracking, and the drills and slots take structural integrity away from the solid rotor, as well as cause them to heat up faster (less material). A blank is always going to be the best choice for braking performance and durability.....but if the slight trade off is worth saving a little weight I guess it's worth it. I can't answer how much less they'd weigh, maybe google it?
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Old 11-14-2010, 08:09 PM   #4
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Thanks. Looking for weight savings any where i can with out gutting my car.
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Old 11-15-2010, 07:41 AM   #5
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The inevitable problems with most drilled and slotted brake rotors aren't worth the absolutely minimal (2lbs per rotor, at most?) weight "savings" drilled and slotted rotors would give you.
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Old 11-15-2010, 08:11 AM   #6
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youre talking ounces, if anything, 'saved' from drilled. they are stupid and only for looks, nothing else. youd lose more weight taking the floormats out then going to drilled rotors.
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Old 11-15-2010, 09:26 AM   #7
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Probably lose more unsprung weight with lighter front wheels
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Old 11-15-2010, 10:14 AM   #8
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I did weigh mine when I swapped to baers & it was 2lbs per rotor & yes I bought mine for cosmetic looks.
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Old 11-15-2010, 03:33 PM   #9
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Unsprung weight is alot different that sprung. Also brakes are part of the drivetrain, so loosing weight in the brakes sounds like a double good deal, as long as you aren't a roadracer and need the blanks benefits.
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Old 11-15-2010, 03:56 PM   #10
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Unsprung weight is alot different that sprung. Also brakes are part of the drivetrain, so loosing weight in the brakes sounds like a double good deal, as long as you aren't a roadracer and need the blanks benefits.
It's not that there are benefits to blanks over drilled and slotted, it's the numerous disadvantages of drilled and slotted compared to blanks; plus, as shown, it's an absolutely negligible change in weight.
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Old 11-15-2010, 06:18 PM   #11
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WOW,only 4lbs. not worth the weight and money when i just replaced my brakes with factory replacemants. Thanks alot guys.
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Old 11-16-2010, 09:59 AM   #12
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It's not that there are benefits to blanks over drilled and slotted, it's the numerous disadvantages of drilled and slotted compared to blanks; plus, as shown, it's an absolutely negligible change in weight.
Sounds like glass half full/half empty to me. But also, not only does drills/slots lower the mass of the rotor, it can give less surface area to the rotor, further reducing heat dissipation.
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Old 11-16-2010, 10:41 AM   #13
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Sounds like glass half full/half empty to me. But also, not only does drills/slots lower the mass of the rotor, it can give less surface area to the rotor, further reducing heat dissipation.
Yep, that's one of the disadvantages, as well as creating less swept surface, meaning less friction, meaning less braking power.
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Old 11-16-2010, 03:30 PM   #14
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Some one should tell GM, BMW, and the other high in car comp this info.
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Old 11-16-2010, 04:22 PM   #15
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Some one should tell GM, BMW, and the other high in car comp this info.
Here we go again
Check out their race cars that use iron rotors, you will see slotted rotors, but not drilled. While you are at it check out the major name brand brake companies and what that have to say about track use with drilled rotors (or what some say about drilled rotors in general).
Drilled rotors used to be useful back when pads expelled gas, modern day pads don't though.
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Old 11-16-2010, 04:25 PM   #16
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Because god knows that car companies never do anything blingy to their cars! And all those cars when raced use cross-drilled rotors. Wait... no, they don't!

Why does this subject come up a million times over? It's physics people... Drilled rotors offer less mass to deal with heat. They offer less swept area for the pads to contact. They create tubulence in the vaning of the rotor. You see no race cars (where performance sort of matters) running them for those reasons. Yeah, you see some street car with them, but then again I see Z06's come with one brake rotor running backwards too-----direct from GM.
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Old 11-16-2010, 04:40 PM   #17
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but then again I see Z06's come with one brake rotor running backwards too-----direct from GM.
Yeah but GM did it so it must be right...
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Old 11-16-2010, 04:40 PM
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