500

My Subaru rotors don't have balance cuts (stock sliding caliper brakes, not the $$ Brembos), the rotors I got from Canadian Tire (Canadian version of Pep Boys) for my '89 Ford did not have balance cuts but the new Zimmermans I got for my Turbo brakes do.

Hmmm...

I'm not certain based on that small samples that no balance cuts is an automatic sign of quality. It appears that many rotors are made without them, even for cheaper applications. Probably to save money, not because the rotors couldn't use balancing.

f1rocks

Pray tell me what casting technology you say can consistently do this.

Is it green sand?
Is it all cored?
Cold Box?
Hot Box?
Maybe it's investment casting? (yeah those would be $100 per corner, not)

You tell me cause I've been "in the industry" casting that is for over 20 years bought over $350 Million in equipment, cast thousands of automotive parts per day and I would like to know this new process that can produce it without variation requiring some level of balancing.

zerMATT951

Some people just get quiet when they're called out... that must be the case here. Too bad, I was looking forward to gettin' me some of those Space Shuttle rotors too

Guns951

Temporary Hijack -

f1rocks: Damn dude what is it you do for a living?!?! That's one thing I've yet to digest is that most of the 951 owners seem to be a little older, more experienced and from what I can tell full of **** and vinager. You older dudes are cool. I keep thinking that all you guys on the board are my age, maybe that's why you guys always have the answers I need! This turbo forum rocks!

Hijack over -

HIGHBOOST

I have heard some stories about guys coming in off some hot laps and when they get to the pits, pull there e-brake once stopped. After doing this for a while, their rotors warp due to uneven thermal loading throughout because the pads aren't allowing the section of rotor that they are clamped on to cool. Have any of you guys that road race had this happen to you?

Oddjob

Not really the issue with 944s at least, since the parking brake is a set of drum brake shoes inside the rear rotor hat. Setting the parking brake on a 944 wont cause rotor warping. Some very little/slight potential that the shoes could stick to the rotor hat if the parking brake is set when the rotor is very hot, but again, not a huge risk due to the layout of the 944 parking brake setup.

But regardless, setting the parking brake is not a good habit to get into when coming off the track. I removed the entire parking brake system on my last two track cars - no need for it.

f1rocks

Dude that hurts. I'm a little older at 41.....okay screw it, I'm a lot older than you young guys but I still think young.

Started supervising in a GM UAW shop at 17....that will humble you quick. Graduate on a Sunday and go to work on a Monday in a UAW Foundry with some hombres that would throw you in the Cupola (like a blast furnace) if you pissed them off!

Chris White

Thats the first thing you will be told NOT to do. The only ones that do it are the guys that figure it would be uncool to admit that its their first time at the track!

There are a ton of little tips that you will pick up if you pay attention and ask questions.

Chris White

Stuttgart

Nope I'm still here, just been busy. The only reason I posted on this topic was to throw some info out for everyone to think about, not to sell stuff, and that is why I didn't mention who I work for (Performance Friction). As a supplier to oem's it is extremely frustrating at times dealing with how much they try to remove quality to get costs down. One example was a major american mfg that requested we only machine one disc surface and leave the other a raw casting.

As for the casting, no investment casting, just sand; and of course you can't get perfect castings 100% of the time, but you can do much better with certain technologies and tighter QC when it comes down to what you scrap and what you sell.

As for the space shuttle remark, a major german mfg actually said that we make components that are worthy of the space shuttle and they weren't even refering to our Carbon-Carbon just the iron.
Best regards

zerMATT951

Thanks for the response, but I still wish you'd back up your remarks with examples of the better than average rotors that you implied are available out there.

I have nothing but good things to say about PF brake pads, I've used them on several street cars that I've owned over the years - but I've never seen PF iron. I've always just considered PF pads a higher-quality and better working option than the 1-yr warranty pads that Autozone would otherwise try to sell someone.

r1concepts_

Comparing drilled rotors and slotted rotors, drilled rotors are for general use and street performance. They perform well in rainy climates and deliver more friction and more bite than their slotted counterparts meanwhile, slotted rotors have slots that shave off any brake dust and other particles. The only disadvantage is that they tend to have a shorter life compared with other types.

333pg333

Not sure you should expect people from 2006 to re-engage with your reply. But here's hoping.

Oddjob

Laughing at post #52 where f1 was joking about being 41 back in '06. I'd take 41 these days...

Voith

Time flies...

SeaCay