96DXCivic
96DXCivic HalfDork
2/11/10 10:19 a.m.

Anyone know of a place where I can get custom cast iron brake rotors done?

Keith
Keith GRM+ Memberand SuperDork
2/11/10 10:57 a.m.

It would probably be easier to have hats machined for a standard rotor ring. What diameter are you looking for?

96DXCivic
96DXCivic HalfDork
2/11/10 2:44 p.m.

It is for a Formula SAE car. We are planning on running floating rotors. The hub pattern we are using is a 4x100mm. We are looking for a 10" diameter disc.

DILYSI Dave
DILYSI Dave SuperDork
2/11/10 11:29 p.m.

Does it have to be cast iron? You could just laser cut them out of steel plate.

Keith
Keith GRM+ Memberand SuperDork
2/11/10 11:33 p.m.

Or cut down an existing rotor around the correct size - I've seen a stock 1.6 Miata front rotor turned into a two-piece. 1994-00 Miata front rotors are 10" vented, rears are 10" solid. Either will cost you about $10 at NAPA.

Giant Purple Snorklewacker
Giant Purple Snorklewacker SuperDork
2/11/10 11:42 p.m.

Checkout the Wilwood catalog. You can mate a rotor diameter with a hat of almost any combo. I have also had excellent, patient response from calling them and asking ridiculous questions.

nocones
nocones GRM+ Memberand Reader
2/11/10 11:45 p.m.

We used A2 tool steel for our rotors. We made Hats out of aluminum and machined the dogs out of regular mild steel. Just get them water jet or lazer cut.

44Dwarf
44Dwarf HalfDork
2/12/10 6:45 a.m.

There out there off the self. Peter D Motorsports in AZ has alum hub with floater disks. There are likley a few others too. Checked his site i can't find'em but i know i had a set on a dwarf cars rear axle a while back. You might be able to find some used ones on Dwarfcarracing.com as alot of clubs outlawed alum in any bake parts to hold cost down...

njansenv
njansenv Reader
2/12/10 7:59 a.m.

I'd consider looking for (used?) motorcycle rotors, and machining a hat.

Nathan

AngryCorvair
AngryCorvair GRM+ Memberand SuperDork
2/12/10 8:23 a.m.
njansenv wrote: I'd consider looking for (used?) motorcycle rotors, and machining a hat. Nathan

that's what i was gonna say.

Joe Gearin
Joe Gearin Associate Publisher
2/12/10 8:43 a.m.

Check out www.Racingbrake.com They have custom fit rotor disks and hats.

Or check out their ad on page 108 of the April GRM.

Keith
Keith GRM+ Memberand SuperDork
2/12/10 9:27 a.m.

The biggest problem is going to be finding an off-the-shelf rotor ring that's only 10". Most of them are 11" or larger.

96DXCivic
96DXCivic HalfDork
2/25/10 10:11 a.m.

That is problem I am coming across. I am going with cast iron because it provides the best thermal properties. Also the caliper we are going to be running takes a .38" thick rotor.

BuddyJ
BuddyJ New Reader
2/25/10 10:31 a.m.

The year my team won the Continental Tevis brake system award, we made our own floating rotors. Ductile iron rotors in aluminum hats. Make your own.

96DXCivic
96DXCivic HalfDork
2/25/10 11:55 a.m.

We are planning on making our own aluminum hats. From everything I have read grey cast iron is preferable to ductile iron.

amg_rx7
amg_rx7 Reader
2/25/10 1:10 p.m.

http://www.colemanracing.com/store/shopdisplayproducts.asp?id=14&cat=Brakes

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