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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHas anyone used these rotors?
Leading reported evidence
Use by many dealers as oem replacements
Performed · outcome unconfirmed
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Performed · outcome unconfirmed
Made in Germany, used by many dealers as OEM replacements.
Leading evidence: 'Use by many dealers as oem replacements' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'way you could grind the rotors' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace hats' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suspected cause
There is most likely a way you could grind the rotors on cnc units that won't heat the product up using special cooling jets and liquids - but I'm sure the price point is way north of a set of new rotors for any service like this.
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Suggestion
The good news is that they should last almost twice as long, and when they wear out you can replace the hats for only $300 a piece.
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Suggestion
Or is it another cash grab to make a part that in the past just about outlived the car (or only was changed once) to make it a semi annual replacement deal and profit center?
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Suggestion
If you would have installed your GT2 wing on your home 'puter, it would have run faster!
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Suggestion
Or is it another cash grab to make a part that in the past just about outlived the car (or only was changed once) to make it a semi annual replacement deal and profit center?
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way you could grind the rotors
No successful repair reported for this finding.
0
Identified cause
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Suspected cause
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Reported fixes
Read evidence and context
Discussions that suspect a cause
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suspected cause
There is most likely a way you could grind the rotors on cnc units that won't heat the product up using special cooling jets and liquids - but I'm sure the price point is way north of a set of new rotors for any service like this.
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62 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Andy, I was thinking that exact same thing!
Shark Attack, I'm not sure I would want to trust my car/life on some "unknown" brand of rotors. Porsche OEM brakes have a stellar reputation for stopping power. Just my opinion.
Are you sure that's for 2 rotors? If so that's awfully tempting but I would ask them who the manufacturer is and where they're made....
Here's a good deal for Zimmerman's (OEM) with free shipping:
http://www.autopartswarehouse.com/se...Ntt=zimmermann
In the past few years, the prices of rotors seem to be dropping. Call just about any parts supplier and they can quote you a vast range of prices for the same application. When you compare the rotors side-by-side, they may look the same. But, the difference between a comeback and satisfied customer might be at the microscopic level.
Just about every rotor is made of cast iron. But, what can make or break a rotor are ingredients like carbon, silica and pearlite. Also, how a rotor is cast and cooled can determine its final properties. This is called the science of metallurgy.
Ensuring that a rotor has the right metallurgy costs the manufacturer time and money. It is not that the raw material costs more, it is that the manufacturing process may require more expensive equipment. Also, the energy costs and labor costs may be higher
You may be saying, "iron is iron." This is not true when it comes to brake rotors. OEMs use different grades of iron to ensure that a vehicle platform has the right characteristics of wear, noise dampening and performance. Like brake pads, rotors can be vehicle specific.
Taking a chance with some "cheap," "economy" or "inexpensive" aftermarket rotor that does not use the right grade of iron or manufacturing process could end up in a comeback.
Read More Here
like I thougt - IRON (for most rotors, I will find ouot if Porsche OEM is, but this is a good read on those cheap rotors)
Yeah, ya know i am kinda going against my "rules". Buy going cheap.... They have got to be chinese. everytime I go against my rules I pay for it. Those zimmers look like they have my name on them
I get the "all iron is not created equil" Thank you for the education.
I think I am going to go with the Zimmers.
Yeah, only need them once in a while anyway.
The PO must have used them wayyyyyyyy to much being I need new rotors.
Good call Kyle. I have had nothing but problems with non-OEM rotors on my Subaru (try 2 sets of rear and 1 set of front rotors in 35,000 kms). I went with whitebox aftermarket the first time (read Chinese) and Japanese aftermarket the second time and had nothing but issues. Will be sticking to OEM from here on in.
I thought when you add other than iron like carbon it is then that the term steel is used. I also wonder if the parts guy or ebay seller knows the difference in steel or iron. It's just metal and called steel or iron all to them. For OEM rotors I could of sworn there is a light mix of graphite in the mix. I also kind of think any rotors have carbon in them. The great think about steel is that it is stronger then iron with its carbon and such added. I could be wrong since I'm just a little old man wondering around the internet lost to the world....heck worse yet I'm not driving my 911 or riding my bike so I must be all ate up
Oh yah it could be steal (stolen) rotors hehehe
My independent shop said that Porsche does not allow the rotors to be turned. That being said, I have drilled, slotted rotors on another vehicle and was told the same thing. I have 6,000 miles since having them turned anyway (within spec thickness) and no issues. I learned that only certain machines can turn modified rotors and it has to be done at a slower speed (rpm) and it needs to be done taking less metal away on each pass.....
Porsche specs are really tight... I read them once I thought about it... turning will most likely NOT meet spec, they would need to be ground IMO - but yes they are hard to turn.
I found a thread in the boxter board it said pretty much all p cars is 2 MM. I think I am well beyond this already. I have to go pick up a micrometer tomorrow and have a looksee.
the thickness is only part of the spec... and its an easy one. the real biatch is the flatness and paralellism - those are wicked tight specs... tough to hold!
They didnt have everything in Zimmers I went with Sebros. All 4 corners with pads 480.00 AND If you use the "live help" and its your first order I got 5% off from that guy
Back to the OP. I asked the seller where they were from and who was the manufacture. Here is his reply
I told him thats what they told me about my drywall and kids pixos and I am going to pass on China product.
You can't turn OEM rotors that have 'cast' in holes. Not sure about the aftermarket brands that 'drill' the holes but the act of turning a rotor with cast holes can cause cracking on the down stream side of the hole as the cutting tool 'bite's into it. It really 'chunks' the edge of the backside of the hole on every rotation of the cutting tool. I rather suspect it wouldn't be a good idea to do it on the drilled type as well.
What you can do as long as the surface is flat and free of ridges - it have the lip ground off on the outside of each rotor. I'm told this is ok to do but you would have to wonder what the payout would be from a labor charge standpoint / expected 'extra' miles. I think it's a 'while I am paying a labor charge I may as well just replace them thing really.
Grinding (the whole surface) from what I know can cause you to loose the heat treatment that was applied to the the product at the time of manufacture. From my highschool machine shop classes I can tell you that I f**ked up a lot of projects this way using too much rpm and being too agressive on material removed.
There is most likely a way you could grind the rotors on cnc units that won't heat the product up using special cooling jets and liquids - but I'm sure the price point is way north of a set of new rotors for any service like this.
Agreed - that's my thought on turning too - and grinding would be like a blanchard grind that would be more expensive than new IF you could find someone to do it. That said if you worked at a grinding shop
BTW I am a senior prototype machinist and have 20 years of machine shop under my belt
I get it
Good to know! Too bad you live so far.
Wouldn't you suspect that there would also be a difference in Rockwell numbers between a brand made offshore (OK - I'll say it - China!) and the OEM brand?
You have to wonder when you see pad material just eat into rotors for some of these products.
I get the part about todays thinner rotors - it's all about less material gets rid of more heat at a higher rate etc. But when you see the way the some peoples rotors look after only one set of pads you have to wonder if the manufacturers are using the rotors as some form of a new ablative material - just as the pads were 'supposed' to do.
I mean have we reached the tipping point of heatsoak that even where we use thinner rotor designs and softer pads, increase the dia of the rotors, add extra pads and pistons - have now reached the point where the rotor HAD to wear at a higher rate too?
Or is it another cash grab to make a part that in the past just about outlived the car (or only was changed once) to make it a semi annual replacement deal and profit center?
I have used band new China Carbide cutters in really basic operations and had them just disintigrate...I prefer German made cutters but will settle for japanese if I cant find what I need - bottom line, china makes crap metals (today) BUT if we keep letting them make stuff (ALL THE STUFF) they will get better
If you would have installed your GT2 wing on your home 'puter, it would have run faster!
Note to self: Tim, you have to stop picking on Ed..... for at least one day this week! Obviously, today is NOT that day!
Dudes, are we seriously having a conversation about putting Chinese made front rotors on?? Are you f*&*((g kidding me? What's next, a fuel filter made of a soup can and paper towels?
Buy American. Try Gyrodisk. They're free floating and supposedly can't warp. But sorry, you can't buy them on fleabay for $99.99, and they don't come w/ a free pokemon.
I edited out my approval of medtech's reply. Even though it advocated a violent end in sorts for buying communist parts.....
I mean uh yah man. Use good parts.
You know using china parts on the 911 could well be a very violent ending to your car also. After market parts do not have to be safety qualified on the car as far as I know.
as a matter of fact, yes, yes we are. It didnt start out that way. It started out with an unknown brand. But then we found out they were *****... so then the thread turned into a thread about putting ***** rotors on the cars.
So in a round about way, yeah, thats just kinda the way it turned out. Sorry..... we'll stop now.
Buy American? WTF? its not an american car. Hell its not even BUILT in the usa like a honda..... Buy american? all we have is the vette and Im not a redneck..... well today anyway
maybe
No Medteck - I think the discussion is more about the techincal REASONS why we shouldn't buy this crap instead of a 'political' reason why we shouldn't - as I think your suggesting.
If you use politics to rule what you buy - where do you draw the line? Gee, I can't buy a P Car because one of their people gassed six million jews. I can't buy anything from Japan as they killed an uncle of mine protecting Hong Kong during ww2. Gee, can't buy russian vodka either - Stalin wiped out an est 25 million people. China = Tibet. Ok, can't go near Walmart. (Not that I do for that reason). Can't buy in the USA as mini Bush didn't find WMD in Iraq. (Not that I agree - just sayin some people have an issue) Can't buy Canadian because we are supposed to be abusing harp seals. The list goes on and on and so does the BS.
Buy based upon value against quaility and tilt it towards what turns your crank. If you boycott stuff not made in America then you better sell your P Car and I'm afraid your living in a tent I guess. No wait - the tent's come from China too!
I have a Yogi Bear tent and it was made in Jellystone National Park. If you think for one minute that stealing pickinick baskets constutues a boycott !!
how the hell did a rotor thread turn into a fight over pickininck baskets anyhow BooBoo
I'm not sure what happened either.
Just for the record, my frustration was with the thought of using a low quality, part on a highly critical (read safety, maybe crash and kill you) part of the car. With all of the recent manufacturing issues out of China, I think they have earned that reputation at the moment.
If you think I'm a racist or redneck you are reading something into the post that isn't there. I think Ed knows me well enough to know that I have no issues w/ asians (especially since I married one).
As far as buying American...that's purely an economic stance. If a product is equal quality or better, then it is better to spend our money at home than send it overseas. Same philosophy applies when I try to shop in the town I live. Support the local economy as much as possible. At the same time I do not support buying inferior products regardless of where they are made, and for that reason I will probably never own an American car.
Hey that's Medtechs dog. All he needs is a box of Milk Bones and some uncooked bones for dogs from the butcher and he'll be ready for a date with a poodle.
Yea, it does look like meth mouth.
Actually THAT is what you get from too many years of biting bad guys.
Thankfully he likes to eat raw mint leaves, so his breath isn't so bad.
Just get the Zimmerman's from Pelican Parts. They are a bit more inexpensive than the Porsche rotors and have the added benefit of an anti-corrosive coating on the "hats" (Porsche rotor hats tend to rust).
Zimmerman's from Pelican = same price for OEM rotors from Sunset. Are Zimmerman's preferred over OEM from a durability perspective (i.e. DE track use with street tires)?
I would guess they are pretty equal. But there is nothing wrong with OEM rotors in general.
IMO To get a real "improvement" you will need to spend 3-4x as much on a free floating rotor set. The good news is that they should last almost twice as long, and when they wear out you can replace the hats for only $300 a piece.
