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Old 01-18-2010, 03:37 PM   #1
rmnc3r
 
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Drill Rotors DIY

Hey, a question to the machinists:

Can the brake rotors be drilled with good effect by a home shop tinkerer?
It would seem simple enough to devise a paper layout and simple jig
for a drill press. Machining a slot would best be left to a professional, but
drilling and chamfering holes should be easy enough.
Any hidden dangers or caveats?
Whaddya think?

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Old 01-19-2010, 10:59 AM   #2
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Not a machinist. But you don't want holes in your rotors. Professional or home DIY. They are only for looks, and if really used hard will develop cracks coming out of the holes.

If you have to have that look, buy a top name brand already holy.

There is a reason you don't see holes on any of the Nascar teams rotors.
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Old 01-19-2010, 04:05 PM   #3
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Yeah I really wouldnt recomend taking drill bits to the rotor haha they will crack if not done right.
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Old 01-19-2010, 04:06 PM   #4
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Drilled will crack, go slotted from a name brand if you want to go that route.
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Old 01-19-2010, 04:17 PM   #5
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If the holes are chamfered they will not crack. That is the purpose of chamferred holes. As for doing it yourself, you need to have VERY sharp and high quality bits to avoid creating hot spots when you drill and get the speed perfect for the bit that is used. Plus measuring out the pattern to avoid hitting the cross vanes is a PITA.

Personally I would go with the Stillen rotors are similar that are already drilled and zinc coasted....
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Old 01-19-2010, 05:46 PM   #6
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A couple of points.

First in my opinion, I wouldn't do anything to your rotors yourself. Your life depends on your brakes and I wouldn't take the remotest chance that you could duplicte the real tolerances and specifications required.

Second, I am told by folks I trust that drilled rotors are more cosmetic than functional. Arguably they are lighter, but slotted rotors do a better job of getting the gases out than drilled holes.

Third, I agree NASCAR doesn't have drilled rotors that I've seen, but every performance motorcycle on the road does. I think this is because the rotors are so thin that you couldn't slot them very well.

Fourth, I am seriously considering cross drilled rotors for our new Sky. They look awesome and I would pay for the Z51 package on the Corvette just to get the look. But I think even there they are a visual clue that you bought the better package. And you don't have enough money for me to do it myself and still drive the car.

Hope that helps, Just my 2 cents.
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Old 01-19-2010, 05:56 PM   #7
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Thanks for the input.
Valid and well thought out responses, especially regarding the cross vanes.
I have drilled rotors on my MCs and assumed it was for heat dissipation.
Sounds like it would be more trouble (and dangerous) than it's worth.
Cheers!
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Old 01-19-2010, 06:03 PM   #8
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Quote:
Originally Posted by rmnc3r View Post
Thanks for the input.
Valid and well thought out responses, especially regarding the cross vanes.
I have drilled rotors on my MCs and assumed it was for heat dissipation.
Sounds like it would be more trouble (and dangerous) than it's worth.
Cheers!
RixRad
Me too! And you are correct. It is for heat dissipation and out-gassing of the pads. It has been a long time debate on which is better, holes vs grooves.

But it has been stated on many vendors' sites that holes are better for heat and out-gassing and grooves are better for pad face wiping. That is why you see more and more coming with both!

As for bikes, there is not enough material to do grooves as it decreased min thickness...
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Old 01-19-2010, 06:14 PM   #9
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Quote:
Originally Posted by rmnc3r View Post
Thanks for the input.
Valid and well thought out responses, especially regarding the cross vanes.
I have drilled rotors on my MCs and assumed it was for heat dissipation.
Sounds like it would be more trouble (and dangerous) than it's worth.
Cheers!
RixRad
exactly. no sense in risking screwing something up. plus a lot of "drilled" rotors are actually cast with the holes in them instead of casting blanks then drilling them.


and Number 3.... doesnt the ZR1 have drilled rotors?
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Old 01-19-2010, 06:40 PM   #10
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The ZR1 has carbon ceramic rotors, a completely different monster. No reason to drill your rotors. I dont think slotted are really needed either for 99% of the people out there. All its going to do is cause noise and vibration.
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Old 01-19-2010, 06:41 PM   #11
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Also, once you drill the rotors, they can't be cut.
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Old 01-19-2010, 08:05 PM   #12
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Quote:
Originally Posted by CamaroSpike23 View Post
exactly. no sense in risking screwing something up. plus a lot of "drilled" rotors are actually cast with the holes in them instead of casting blanks then drilling them.


and Number 3.... doesnt the ZR1 have drilled rotors?
Quote:
Originally Posted by oachalon View Post
The ZR1 has carbon ceramic rotors, a completely different monster. No reason to drill your rotors. I dont think slotted are really needed either for 99% of the people out there. All its going to do is cause noise and vibration.
Z51 came with cross drilled rotors and I believe those came with the MR shock package as well. Now that Z51 is in the Grand Sport package. As oachalon says, the ZR1 has 10 grand worth of ceramic rotors, and unless my eyes deceive me, those are cross drilled as well and looking mighty bad a$$ to me.

But I am going by a hallway conversation with a Corvette brake engineer who had the opinion they were more for show and that slots were superior for outgassing. But slots don't look as cool as cross drilling.

And now that I look at that picture above my littel Sky, I think I need bigger brakes. LOL Those ZR1 brakes look bigger than my tires.
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Old 01-19-2010, 08:33 PM   #13
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Ok reaaallllly crappy shop on this one...........................but makes me go hmmmmmmmmmmmmmmmmmmmmmmmmm for sure.
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Old 01-19-2010, 08:50 PM   #14
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The Stillen ones are pretty good and reasonably priced - IMO

Not on the car yet - hopefully tomorrow
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