pip9

I have a big brake kit on my car with 332mm cross drilled rotors. The pads are almost gone and the rotors are warped. Can i turn them or do u have to buy new rotors?

rsx girl

Yes you can turn the rotors but its hard to find places that will do it for you.

but since your rotors are warped, please do change it because it will mess up your brake pads.

pip9

I can turn them myself. Im a tech for toyota. I heard from a brembo distributor that u can't. might be just them trying to sell me new rotors.

Anyone ever had cross drilled rotors turned??

dohcVTECeg2

just buy some new ones

pip9

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohcVTECeg2 &raquo;</TD></TR><TR><TD CLASS="quote">just buy some new ones</TD></TR></TABLE>

thanks that definitely answered my question
Do u even realize how much new 332mm brembo rotors cost??

dohcVTECeg2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pip9 &raquo;</TD></TR><TR><TD CLASS="quote">

thanks that definitely answered my question
Do u even realize how much new 332mm brembo rotors cost?? </TD></TR></TABLE>

how much do they run for?

egsleepercivic

i have had my ex sized crossdrilled rotors turned, should be no problem same as doing a regular rotor

gl

pip9

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohcVTECeg2 &raquo;</TD></TR><TR><TD CLASS="quote">

how much do they run for?</TD></TR></TABLE>


for a set of pads i was quoted $245
for a set of rotors (2) i was quoted $658

thanks again for ur original comment very helpful...

RyanA

Most places will not turn crossdrilled/slotted rotors. This is because when their bit hits the slot or hole, it can break the bit. The correct way to do crossdrilled or slotted rotors is have the surfaced; like they do on a flywheel for a manual trans car. It's kind of a PITA to find someone that will take the time to do it for you but it will be well worth it when you are done.

crawlin

i work at shop you can cut those rotors, no they will not screw up your pads the reason you cut rotors is to get the warpage it out of them and make a smooth surface again. the only way you would not be able to cut them is if they are too close to the min. spec.

how many miles are on these?

BlueIntegraBoy

iTrader: (5)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pip9 &raquo;</TD></TR><TR><TD CLASS="quote">


for a set of pads i was quoted $245
for a set of rotors (2) i was quoted $658

thanks again for ur original comment very helpful... </TD></TR></TABLE>

Dude, PM 88Rotors and get Brembo blanks (or x-drilled/slotted) and pads for $180-230 shipped. This is for all four sides, will be cheaper if doing just the front.

bmoua

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

Dude, PM 88Rotors and get Brembo blanks (or x-drilled/slotted) and pads for $180-230 shipped. This is for all four sides, will be cheaper if doing just the front.</TD></TR></TABLE>

thats where i got my rotors...but there not really brembo's...well at least i dont think so...some one correct me if i'm wrong???

BlueIntegraBoy

iTrader: (5)

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

thats where i got my rotors...but there not really brembo's...well at least i dont think so...some one correct me if i'm wrong???</TD></TR></TABLE>

They offer two brands, Brembo and their own. I got my Brembos there.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pip9 &raquo;</TD></TR><TR><TD CLASS="quote">
for a set of pads i was quoted $245
for a set of rotors (2) i was quoted $658
</TD></TR></TABLE>

Where in the hell are you shopping? $250 for pads?

I buy Autozone rotors or Brembo blanks for less than $30 and track my car all weekend long.

You shouldn't turn x-drilled rotors, as you can break the bit, or the bit may chip the rotor which could lead to failure. I think you may be able to mill them, but then there's no way to know if it's true or not.

schardbody

haha, most of you are missing the big picture.

CD/slotted rotors are meant to do a few things, one of which is disipate heat better than OEM. the less mass the less heat it will disipate. therefore, resurfacing oversized rotors or CD/slotted rotors is no good, UNLESS, you have them purely for bling, the thinner they get the more heat they hold, point blank.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">
CD/slotted rotors are meant to do a few things, one of which is disipate heat better than OEM. </TD></TR></TABLE>

No, it's not. They were originally developed for high performance race cars before non-organic pads were available. Those pads would 'gas' and create a layer of burnt gasses between the pad and rotor wich would lead to no friction and no breaking. The cross drilling and slotting was meant to vent the gas. Current 'sports cars' such as porsche and fararri use them for aesthetic purposes now.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">the less mass the less heat it will disipate.</TD></TR></TABLE>

Actually the less mass, the more heat it will dissipate at a faster rate. That's why OEM disks are so prone to warping. Very little mass and quick heat cycling rates lead to warpage.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">UNLESS, you have them purely for bling, the thinner they get the more heat they hold, point blank. </TD></TR></TABLE>

How is that even possible. Think about it for a bit.

schardbody

schardbody

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AutoXer &raquo;</TD></TR><TR><TD CLASS="quote">No, it's not. They were originally developed for high performance race cars before non-organic pads were available. Those pads would 'gas' and create a layer of burnt gasses between the pad and rotor wich would lead to no friction and no breaking. The cross drilling and slotting was meant to vent the gas. Current 'sports cars' such as porsche and fararri use them for aesthetic purposes now.

Actually the less mass, the more heat it will dissipate at a faster rate. That's why OEM disks are so prone to warping. Very little mass and quick heat cycling rates lead to warpage.

How is that even possible. Think about it for a bit.</TD></TR></TABLE>

i would argue but theres no point, you think you know what you are talking about but you are thinking about it wrong. if less mass dissipates heat faster/better than why wouldnt a 3 ton van use tiny rotors??? easy, rotors are a big heatsink, the bigger the heat sink (larger the mass) the quicker it disipates heat, therefore you suck at life and should stab yourself in the eye w/ a pencil.

AutoXer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">
easy, rotors are a big heatsink, the bigger the heat sink (larger the mass) the quicker it disipates heat</TD></TR></TABLE>

No, you have it wrong... a heat sink absorbs and retains energy. The more mass the more energy (heat) it's able to retain and store. Metal can only release energy at a certain rate, so the more heat retained, and the more energy stored, the longer it takes to dissipate. That's why the thin OEM rotors warp so quickly, fast heat cycling from the low mass disturbs the orientation of the molecules causing warpage.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote"> therefore you suck at life and should stab yourself in the eye w/ a pencil. </TD></TR></TABLE>

You should really refrain from throwing out insults on a subject that you may not be all that well versed on. I've been doing automotive engineering for 6 years now, and have an MS in mechanical engineering and another one in metallurgy.

SovXietday

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">i would argue but theres no point, you think you know what you are talking about but you are thinking about it wrong. if less mass dissipates heat faster/better than why wouldnt a 3 ton van use tiny rotors??? easy, rotors are a big heatsink, the bigger the heat sink (larger the mass) the quicker it disipates heat, therefore you suck at life and should stab yourself in the eye w/ a pencil. </TD></TR></TABLE>
You sir are an idiot.

What type of warped physics class did you attend? More mass disipates heat faster than less mass? Are you kidding me!?

A van does not use tiny rotors for one reason.

The more surface area on the rotor used, the better the stopping power. Heat dissipation has almost nothing to do with why Ford/Chevy/Honda designed their vans to have large rotors as they will never see the conditions in which heat dissipation is of concern.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">haha, most of you are missing the big picture.

CD/slotted rotors are meant to do a few things, one of which is disipate heat better than OEM. the less mass the less heat it will disipate. therefore, resurfacing oversized rotors or CD/slotted rotors is no good, UNLESS, you have them purely for bling, the thinner they get the more heat they hold, point blank. </TD></TR></TABLE>

I think you're the one missing the big picture. The thinner the rotors get the less heat they hold, which means that they heat up faster and create brake fade faster. At the same time, these rotors will also now dissipate heat faster when allowed.

I think you need to educate yourself before you educate others.

Jim Truett

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">haha, most of you are missing the big picture.

CD/slotted rotors are meant to do a few things, one of which is disipate heat better than OEM. the less mass the less heat it will disipate. therefore, resurfacing oversized rotors or CD/slotted rotors is no good, UNLESS, you have them purely for bling, the thinner they get the more heat they hold, point blank. </TD></TR></TABLE>

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

i would argue but theres no point, you think you know what you are talking about but you are thinking about it wrong. if less mass dissipates heat faster/better than why wouldnt a 3 ton van use tiny rotors??? easy, rotors are a big heatsink, the bigger the heat sink (larger the mass) the quicker it disipates heat, therefore you suck at life and should stab yourself in the eye w/ a pencil. </TD></TR></TABLE>



Think of the brake system as an energy converter of sorts. They convert the forward motion of the vehicle into heat, which must be absorbed by the rotors.

With a rotor of less mass, there are fewer cubic inches of material to absorb this heat, and keep it below a given maximum design temperature. The thinner rotor will dissipate that heat to atmosphere much faster. This is the cause of warpage on OEM spec rotors used in a performance application. They swing from one temperature extreme to the other in a short period of time.

The rotor of greater mass will have the ability to handle a greater amount of heat imparted into it before it reaches the maximum design temperature. It will also retain that heat for a longer period of time.

A 3 ton van uses large rotors for the increased friction area needed to stop the vehicle, and as a given more material is needed to keep temperatures at a safe level.

Jim Truett

Oh, for the OP,

If you turn the cross drilled rotors, I would recommend putting a slight chamfer on all of the holes when you are done.

bmoua

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

They offer two brands, Brembo and their own. I got my Brembos there.</TD></TR></TABLE>

i got the brembos slotted/drilled too but i researched it and brembos only makes slotted or drilled...but i remember reading something on 88 rotors web site stating they make there own brembo rotors...so they dont get it from the actual brembo manufactors....can anybody clear this up????

Kamin

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">i would argue but theres no point, you think you know what you are talking about but you are thinking about it wrong. if less mass dissipates heat faster/better than why wouldnt a 3 ton van use tiny rotors??? easy, rotors are a big heatsink, the bigger the heat sink (larger the mass) the quicker it disipates heat, therefore you suck at life and should stab yourself in the eye w/ a pencil. </TD></TR></TABLE>
ahaha

go back to school

and CD/slotted rotors are worthless. just buy blanks. cheaper, work better and you will never have to ask this question again.

killerB16A

ok the bigger the rotor the longer it takes to heat up..but... this also means it takes longer to cool off thus part of the reason they are cross drilled to help displace the heat. i see this all the time at work. lets say i cut a peice of metal that is 12 by 12 by 1 inch thick and i take a good cut on it lets say .125 cut deep over 2 inches at a time..this peice of mettal will heat up very quickly....now if i used the same size material but made it 2 inches thick i will take almost twice as long to reach the same temp...and everyone know that a bigger rotor helps you stop faster..and by stoping faster you are creating les friction for a shorter period of time.....oh just so you know what im talking about i work in a machine shop..but who cares