Summit makes drilled/slotted rotors for the Bonneville
#11
Junior Member
Posts like a Ricer Type-R
Most brake shops won't turn drilled rotors. So plan on possibly throwing them away in a year if they even last that long (instead of having them turned).
Reducing braking surface with holes is ridiculous. The holes do nothing for performance on a street car. Slots do.
Reducing braking surface with holes is ridiculous. The holes do nothing for performance on a street car. Slots do.
#12
Senior Member
True Car Nut
Join Date: Jan 2006
Location: NEBF:06,07 | NYBF:06,07 | ONBF:06,07 | CNBF:06 & more............
Posts: 8,029
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by willwren
Most brake shops won't turn drilled rotors. So plan on possibly throwing them away in a year if they even last that long (instead of having them turned).
Reducing braking surface with holes is ridiculous. The holes do nothing for performance on a street car. Slots do.
Reducing braking surface with holes is ridiculous. The holes do nothing for performance on a street car. Slots do.
and if the less braking surface is back with the holes why to brand new rice bikes come with swiss cheese roters? they stop just fine...
my bro did ALOT of research on them befor he got them... and wow it maid a HUGE diffrence is stoping power
#13
Junior Member
Posts like a Ricer Type-R
Bandit, new rotors and pads do make a difference. If you drilled your current rotors and made no other changes, you would lose braking efficiency.
Motorcycles have holes CAST into the blanks because they can make the rotors larger in diameter to gain back the surface area they lose from the holes.
Motorcycles have holes CAST into the blanks because they can make the rotors larger in diameter to gain back the surface area they lose from the holes.
#14
Senior Member
True Car Nut
Join Date: Jan 2006
Location: NEBF:06,07 | NYBF:06,07 | ONBF:06,07 | CNBF:06 & more............
Posts: 8,029
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by willwren
Bandit, new rotors and pads do make a difference. If you drilled your current rotors and made no other changes, you would lose braking efficiency.
Motorcycles have holes CAST into the blanks because they can make the rotors larger in diameter to gain back the surface area they lose from the holes.
Motorcycles have holes CAST into the blanks because they can make the rotors larger in diameter to gain back the surface area they lose from the holes.
#15
Junior Member
Posts like a Ricer Type-R
Different pad and rotor materials or quality. If the holes were filled, he'd have better braking.
You're not understanding all the dynamics here. Drilled rotors micro-crack with heat cycling over time. Each hole weakens the rotor. When the rotor is weakened, and it heats up, it can crack and break. This can cause caliper damage, wheel damage, tire damage, or any number of other issues. This is why most brake shops won't turn drilled rotors:
1. They don't want the liability. Lawsuits suck.
2. The already weaker rotor becomes even weaker when material is removed during turning.
3. The rotors can come apart during turning if they've already cracked.
4. Most crossdrilled rotors are used on rice for show, no go (or stop) and are typically abused.
5. Most brake shops know the applications and proper brake component selections.
Premium 'crossdrilled' rotors aren't actually drilled. The holes are cast into the blanks first, then hardened, then turned to the final thickness before being sold. This procedure is used on PREMIUM performance rotors. Perhaps 5% of the drilled rotors on the market. They are also typically part of a 'big brake' kit, or are replacement rotors for cars that had these rotors OEM from the factory, and the larger diameter was pre-designed into them.
95% of the 'drilled' rotors on the market today are for show. And they are inferior because of it.
You're not understanding all the dynamics here. Drilled rotors micro-crack with heat cycling over time. Each hole weakens the rotor. When the rotor is weakened, and it heats up, it can crack and break. This can cause caliper damage, wheel damage, tire damage, or any number of other issues. This is why most brake shops won't turn drilled rotors:
1. They don't want the liability. Lawsuits suck.
2. The already weaker rotor becomes even weaker when material is removed during turning.
3. The rotors can come apart during turning if they've already cracked.
4. Most crossdrilled rotors are used on rice for show, no go (or stop) and are typically abused.
5. Most brake shops know the applications and proper brake component selections.
Premium 'crossdrilled' rotors aren't actually drilled. The holes are cast into the blanks first, then hardened, then turned to the final thickness before being sold. This procedure is used on PREMIUM performance rotors. Perhaps 5% of the drilled rotors on the market. They are also typically part of a 'big brake' kit, or are replacement rotors for cars that had these rotors OEM from the factory, and the larger diameter was pre-designed into them.
95% of the 'drilled' rotors on the market today are for show. And they are inferior because of it.
#16
Senior Member
True Car Nut
Join Date: Sep 2004
Location: Fitchburg Ma _ToastedRice_
Posts: 6,837
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by willwren
Different pad and rotor materials or quality. If the holes were filled, he'd have better braking.
You're not understanding all the dynamics here. Drilled rotors micro-crack with heat cycling over time. Each hole weakens the rotor. When the rotor is weakened, and it heats up, it can crack and break. This can cause caliper damage, wheel damage, tire damage, or any number of other issues. This is why most brake shops won't turn drilled rotors:
1. They don't want the liability. Lawsuits suck.
2. The already weaker rotor becomes even weaker when material is removed during turning.
3. The rotors can come apart during turning if they've already cracked.
4. Most crossdrilled rotors are used on rice for show, no go (or stop) and are typically abused.
5. Most brake shops know the applications and proper brake component selections.
Premium 'crossdrilled' rotors aren't actually drilled. The holes are cast into the blanks first, then hardened, then turned to the final thickness before being sold. This procedure is used on PREMIUM performance rotors. Perhaps 5% of the drilled rotors on the market. They are also typically part of a 'big brake' kit, or are replacement rotors for cars that had these rotors OEM from the factory, and the larger diameter was pre-designed into them.
95% of the 'drilled' rotors on the market today are for show. And they are inferior because of it.
You're not understanding all the dynamics here. Drilled rotors micro-crack with heat cycling over time. Each hole weakens the rotor. When the rotor is weakened, and it heats up, it can crack and break. This can cause caliper damage, wheel damage, tire damage, or any number of other issues. This is why most brake shops won't turn drilled rotors:
1. They don't want the liability. Lawsuits suck.
2. The already weaker rotor becomes even weaker when material is removed during turning.
3. The rotors can come apart during turning if they've already cracked.
4. Most crossdrilled rotors are used on rice for show, no go (or stop) and are typically abused.
5. Most brake shops know the applications and proper brake component selections.
Premium 'crossdrilled' rotors aren't actually drilled. The holes are cast into the blanks first, then hardened, then turned to the final thickness before being sold. This procedure is used on PREMIUM performance rotors. Perhaps 5% of the drilled rotors on the market. They are also typically part of a 'big brake' kit, or are replacement rotors for cars that had these rotors OEM from the factory, and the larger diameter was pre-designed into them.
95% of the 'drilled' rotors on the market today are for show. And they are inferior because of it.
whereas in real life, SOME drilled rotors are simply drilled OEM spec rotors and SOME are actually a better quality cast rotor...
#17
Junior Member
Posts like a Ricer Type-R
Most are junk and not appropriate for street use.
Some (limited few) are OEM applications and good-quality, but the diameter should be increased when going to those. Most of us can't afford these limited few good ones.
One more thing during turning: The cutting tool can chip away the entrance to the hole during turning as the tool catches the brittle edge. This isn't a problem on quality slotted rotors, as they predetermine the slot valley angle to account for turning. Quality drilled (cast hole) rotors have a generous chamfer on the entrance and exit of the hole for this reason.
Some (limited few) are OEM applications and good-quality, but the diameter should be increased when going to those. Most of us can't afford these limited few good ones.
One more thing during turning: The cutting tool can chip away the entrance to the hole during turning as the tool catches the brittle edge. This isn't a problem on quality slotted rotors, as they predetermine the slot valley angle to account for turning. Quality drilled (cast hole) rotors have a generous chamfer on the entrance and exit of the hole for this reason.
Thread
Thread Starter
Forum
Replies
Last Post
dsb
Bonneville GXP/ Northstar Powered Cars
0
09-06-2005 02:30 PM
Merlin 91/97
Performance, Brainstorming & Tuning
21
03-27-2004 01:55 AM
xtreme
Bonneville GXP/ Northstar Powered Cars
7
01-12-2004 09:27 PM