Hi,

Just wondering if anyone knows what the difference is between drilled & slotted Rotors? What are the benefits of each type? Which one would suit the prelude?

Any recommendations or anyone who has bought brembo rotors, please let me know what you thought of em.

Thanks

 

the benifits depends on you...if you break really hard all the time (like autox)...get the slotted only....cuz once those drill+slotted is heated it will crack...brembo makes good rotors...

 

slotted I'd say. I love my powerslots. as mentioned above, cross drilled tend to crack under high heat

 

if you get drilled brembos, make sure they are counter-sunk and done by brembo themselves and not a company that buys blanks and drills them in-house.

slotted is nice because it constantly puts a fresh surface on your pad, which in turn eats through your pads a little quicker. the way i look at it though, with something like pads, they aren't doing their job if they aren't wearing.

if you're not racing, get blanks. they will last a lot longer and be less expensive.

if you want bling, get whatever you want.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ozluder &raquo;</TD></TR><TR><TD CLASS="quote">Hi,

Just wondering if anyone knows what the difference is between drilled & slotted Rotors? What are the benefits of each type? Which one would suit the prelude?

Thanks </TD></TR></TABLE>

there are no benefits to either, on a street car. on a rally car, slots might help clean the pads of mud or debris, but that's about it.

but on the flip side, drilled and slotted rotors not only cost more, but they crack more, fail more, have less heat sink capacity, and eat your pads at a much faster rate.

get on brembo blanks or OE rotors from autozone. you'll get much better braking out of those than some slotted/xdrilled rotor.

 

this has been debated to death hundreds of times here and everywhere else.

most agree what it comes down to is slotted rotors are best, unless all you care about is looks and prefer drilled rotors...

 

still not sure why slots would be the best?

is that because one pays more money for them over regular rotors? i think we all need to dispel that habit of wanting something to work well because we threw a couple hundred bucks at it and look at things objectively.

 

i am one that sides with those who say blanks are best...
but i did goto a DE a few months back where an experienced driver told me of his friend (who also drove an NSX) that went from blanks to drilled in the front and retained the blanks in the rear. after each session they checked rotor temperatures witha pyrometer. oddly enough, he reported that the front drilled rotors were consistantly cooler than the rear blanks in each session!!!! im not saying that they arent subject to cracking, they just ran cooler for some reason.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bad-monkey &raquo;</TD></TR><TR><TD CLASS="quote">there are no benefits to either, on a street car. on a rally car, slots might help clean the pads of mud or debris, but that's about it.</TD></TR></TABLE>
Depends on your definition of a street car. A street car for me means a daily driver, which in my area means dirt, mud, snow, ice, gravel, salt, rain, slush, you name it.

Because of that, I got slotted rotors. To me, the chances they'd help greatly outweighed any reliability concerns (which are negligible with properly done slots). There are downsides in that my pads dust more & wear quicker, but that just gives me an excuse to replace them more often & try different compounds . . . . .

As far as cross-drilled - they will cool more quickly (more surface area & better ventilation), but at the cost of structural integrity & overall heat-sink capacity. I can't imagine a street scenario where they'd make sense . . .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">
Depends on your definition of a street car. A street car for me means a daily driver, which in my area means dirt, mud, snow, ice, gravel, salt, rain, slush, you name it.

</TD></TR></TABLE>

i do suppose there's a bit of a difference between the perfect dry asphalt of southern california, and the wintr'y salty mess that is the northeast

 

get normal rotors and spend money on brake pads/lines/fluid/calipers...

 

IMO your best off with plain old blank rotors.

 

My stock pads and rotors held up pretty well on the road course in hot Alabama weather. I'd try some better pads and some blanks before going to cross drilled or slotted.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bad-monkey &raquo;</TD></TR><TR><TD CLASS="quote">

there are no benefits to either, on a street car. on a rally car, slots might help clean the pads of mud or debris, but that's about it.
</TD></TR></TABLE>
What he said

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">As far as cross-drilled - they will cool more quickly (more surface area & better ventilation), but at the cost of structural integrity & overall heat-sink capacity. I can't imagine a street scenario where they'd make sense . . . </TD></TR></TABLE>
How is there more surface area if there are holes everywhere? I also doubt that the extra ventilation would end up cooling more quickly since you'd have upped the temperatures by losing surface area.

Anyway, like everyone's said, get blanks (or slotted if you have road conditions like Daemione does). The best improvement you can make to your brakes is a better pad.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Steppin Razor &raquo;</TD></TR><TR><TD CLASS="quote">How is there more surface area if there are holes everywhere?</TD></TR></TABLE>
Because there is . . . . holes going through it adds surface area all through the interior of the rotor. It's just not surface area contacting the pad.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 57STS &raquo;</TD></TR><TR><TD CLASS="quote">IMO your best off with plain old blank rotors. </TD></TR></TABLE>

Isn't it funny how people who actually drive their cars on the track recommend blanks?? There is a reason you know.

The whole cross drilled/ slotted debate cracks me up.

Racing around on the public streets does not make you a racecar driver. AHAHAHA

Calipers and steel braided brake lines will not make you stop faster either. Your braking power is ALL dependant on the weakest link in the brake setup.

If any of you guys want to stop better..get better brake pads and better tires. That's ALL that is need for 99% of us. Stop acting like racecar drivers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">
Because there is . . . . holes going through it adds surface area all through the interior of the rotor. It's just not surface area contacting the pad.</TD></TR></TABLE>

WTF!!! Are you serious?? Do you really believe this?? If you do...PLEASE..NEVER post again. You obviously have NO IDEA what you are talking about. AHAHAHAHA

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by del_parker &raquo;</TD></TR><TR><TD CLASS="quote">

get normal rotors and spend money on brake pads/lines/fluid/calipers...</TD></TR></TABLE>
yea **** that, get sloted if ya need it

 

I've heard from a number of sources, including some in the auto industry that slotted and drilled rotors are more costmetics than anything. They put slotted and cross-drilled rotors on sports car not because it works any better, but because it looks sporty and cool.

Its like when they offered spoilers as an option on every car in creation. They did so not because it enhanced performance but because auto-makers found that it helped the car sell.

There may be some benefit to those rotors, but its going to be so insignificant as to be useless. Some people seem think their car automatically qualifies as a high-performance race car because they speed every so often or take it racing a few weekends a year.

If you're not doing rally racing or 24-hours of Le Mans with your car I dont think you're going to benefit from those rotors. And if you did do anything that intensive then you're going to need a lot more than the average slotted/cross-drilled rotors you see in stores.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">
Because there is . . . . holes going through it adds surface area all through the interior of the rotor. It's just not surface area contacting the pad.</TD></TR></TABLE>

not true. there is more to brakes than just their ability vent to cool. the more material (ie metal) there is, the more there is to heat up, so by drilling the rotors you are removing mass which could potentially absorb heat, as well as create friction when you want to slow down.

again, for most people regular rotors are fine, if you do some track days or other serious racing you might benefit from slotted rotors (which are usually going to be better than more stock-like ordinary rotors). anything else is just for show.

i mean take for example S2000 rotors - they are slotted but they only have like 8 slots around the whole rotor... what's up with those slotted/drilled combos? it's all for show...

 

i have these on my delsol now i like them http://www.thebrakeman.com/convo_e_m_

 

Drilled rotors are rice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AndyD &raquo;</TD></TR><TR><TD CLASS="quote">WTF!!! Are you serious?? Do you really believe this?? If you do...PLEASE..NEVER post again. You obviously have NO IDEA what you are talking about. AHAHAHAHA</TD></TR></TABLE>
Dude, just think about it for half a second. Like I said earlier, cross-drilled rotors cool faster at the expense of overall heatsink capability - any reliable source you can find will say that.

The only way an object like a brake disc is going to cool faster is because the holes drilled in them expose more metal to air - aka more surface area.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">
Dude, just think about it for half a second. Like I said earlier, cross-drilled rotors cool faster at the expense of overall heatsink capability - any reliable source you can find will say that. </TD></TR></TABLE>

What Damione says is true. That is why true road racing vehicles "can" benefit from cross-drilled rotors, due to needing the rotor to lose that insane heat it "heatsinks" during a highspeed stop, and in order to prepare for the next repeat of that same situation, and then the next turn..etc. But does it mean a cross-drilled rotor is better because of it? No. For a very small percentage of us (car enthusists/racers) Yes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Daemione &raquo;</TD></TR><TR><TD CLASS="quote">
Dude, just think about it for half a second. Like I said earlier, cross-drilled rotors cool faster at the expense of overall heatsink capability - any reliable source you can find will say that.

The only way an object like a brake disc is going to cool faster is because the holes drilled in them expose more metal to air - aka more surface area.</TD></TR></TABLE>
I see - you mean more surface area exposed to moving air. I don't think that's the case though since rotors are vaned in the middle so air can get back there anyway.