Do cross drilled rotors improve wet braking?
#41
Staging Lane
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Location: Birmingham, AL
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Originally Posted by VIP1
We dont need to get this technical here.
I posted the explanation from InfoPlease because its not too technical and it was the first hit on Google.
I was just point out that centrifugal force exists. It may not be a "real" force, but it exists.
Calm down, relax, have a beverage of choice.
I posted the explanation from InfoPlease because its not too technical and it was the first hit on Google.
I was just point out that centrifugal force exists. It may not be a "real" force, but it exists.
Calm down, relax, have a beverage of choice.
Bottom line is that cross-drilling helps wet braking performance, but how much is up in the air. Water stuck between the pad and rotor will reduce friction. The water has to be pushed out of the contact area because it cannot be compressed (well it can, but it takes more pressure than a caliper can provide and even then only by about 4%). The water seeks the area of lower pressure contantly, eventually making its way out of the contact area (we're talking fractions of a second). Now, having holes in the contact area would theoretically allow faster dispersion of the water between the pad and rotor because the water simply doesn't have as far to go and there are more places for it to go. This may explain why the initial bite is less effective in the rain, and gets better with drilled rotors.
#42
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Originally Posted by LittleDonny
Bottom line is that cross-drilling helps wet braking performance, but how much is up in the air. Water stuck between the pad and rotor will reduce friction. The water has to be pushed out of the contact area because it cannot be compressed (well it can, but it takes more pressure than a caliper can provide and even then only by about 4%). The water seeks the area of lower pressure contantly, eventually making its way out of the contact area (we're talking fractions of a second). Now, having holes in the contact area would theoretically allow faster dispersion of the water between the pad and rotor because the water simply doesn't have as far to go and there are more places for it to go. This may explain why the initial bite is less effective in the rain, and gets better with drilled rotors.
#45
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I don't see much water getting on a rotor at speed, but I don't see none getting on one either. And I also don't see crossdrilled rotors helping any noticeable amount in the rain, but it does help on a minuscule level. Certainly not enough to warrant the downsides of crossdrilled rotors.
#46
Copy & Paste Moderator
Originally Posted by LittleDonny
There are a lot of "fictitious" forces - and they are called fictitious because they do not exist in the real world. For example, electromotive force is a "fictitious" force - it isn't a force at all, it is a fancy name for potential difference (voltage). Centrifugal force cannot be represented on a free body diagram, therefore for all intents and purposes, it does not exist.
Originally Posted by LittleDonny
I don't see much water getting on a rotor at speed, but I don't see none getting on one either. And I also don't see crossdrilled rotors helping any noticeable amount in the rain, but it does help on a minuscule level. Certainly not enough to warrant the downsides of crossdrilled rotors.
#47
FormerVendor
iTrader: (7)
brakes get too hot to even have water on them. We actually ran water nozzles much like an intercooler sprayer on turbo cars for the brakes on hard race courses. The water is vaporized long before it touches rotor.
Feel the rotor after a drive around town, Youll be suprised how warm they are.
Feel the rotor after a drive around town, Youll be suprised how warm they are.
#52
Copy & Paste Moderator
mmm
Slotted and cross drilled headers..... that would sound interesting. Maybe a bit better than the rusted out exhaust on my mother's 1990 Chevy Lumina.
Slotted and cross drilled headers..... that would sound interesting. Maybe a bit better than the rusted out exhaust on my mother's 1990 Chevy Lumina.