So what did you do to your SHO today!?

[Bluezone]

Most Mercedes ceramic rotors that I have seen are just drilled. No slots, grooves, just holes. I would think Mercedes would know something if those rotors are starting at 5K a pop.

Good point. Ceramic is a different material then cast iron or Steel. I haven't read up on it so I can't speak directly to the qualities of ceramics. But I would imagine Ceramics were chosen for their abilities to handle Heat. Now I'm going to have to read up on that. Lol thanks.

 

[SM105K]

However, on the standard performance package they are still drilled and have minimal slots. Begging the question, why would arguably one of the best performance manufacturers MB/AMG put drilled rotors on their high performance street cars if they can compromise the rotor? Asking for another friend.

MY MB bias is really showing.....and yes. I am still looking for a 2018+ E63S.

 

[Bluezone]

I would guess they found engineering solution 4A way around the Associated problems. I will have a quick look at one of their rotors. Be back shortly.
I'm still looking, but all the aftermarket examples had chamfered holes.
Apparently Mercedes-Benz also uses curved veins for air flow in the rotors. This would tend to increase airflow and relative dwell time, plus surface area. Iirc Ford I was using staggered veins in their rotors at one point. Not sure if they still do that.
Also, one of the main reasons for drilling rotors was to help with outgassing from older brake pad adhesive formulas.

Here's Why You Should Stop Obsessing Over Drilled Brake Rotors

And why slotted brake rotors deserve more love.

carbuzz.com

 

[SM105K]

I would guess they found engineering solution 4A way around the Associated problems. I will have a quick look at one of their rotors. Be back shortly.
I'm still looking, but all the aftermarket examples had chamfered holes.
Apparently Mercedes-Benz also uses curved veins for air flow in the rotors. This would tend to increase airflow and relative dwell time, plus surface area. Iirc Ford I was using staggered veins in their rotors at one point. Not sure if they still do that.
Also, one of the main reasons for drilling rotors was to help with outgassing from older brake pad adhesive formulas.

Here's Why You Should Stop Obsessing Over Drilled Brake Rotors

And why slotted brake rotors deserve more love.

carbuzz.com

All good points.

 

[limited02]

Swapped the stock wheels back on so I can trade it in tomorrow.

 

[Ta2dResqr]

Ok, so they're non-vented rear rotors. Venting holes might actually help with cooling then. Obviously the rear brakes don't see as high of temperature gradient (shock loads). Thicker materials such as solid rotors can tend to crack more easily but with the lower heat gradient I think you would be safe. Try and add some chamfering to the vent holes if none are present. It helps to redirect the stresses around the holes rather than through the holes.

Nope. Vented front rotors. This is the original design. Vented hat along with the vented main rotor. The aftermarket PowerStop are solid along the hat (Ford has also superseded to this design).

 

[Bluezone]

That's just a change in air intake Direction. Overall it shouldn't make much difference in rotor performance.

 

[Kevin81]

Why do most of the high end Euro cars come factory with drilled rotors? Asking for a friend.

Those are typically ceramic. Very different animal than iron.

 

[Zpak]

O

Swapped the stock wheels back on so I can trade it in tomorrow.
View attachment 83409

Oh no! What’s next?

 

[SM105K]

Those are typically ceramic. Very different animal than iron.

We had a complete conversation about that.

 

[Kevin81]

We had a complete conversation about that.

Yeah....I WAS getting a strong case of deja vu, lol

 

[SM105K]

Yeah....I WAS getting a strong case of deja vu, lol

Hahahaha. I needed a good chuckle.

 

[limited02]

O

Oh no! What’s next?

2019 Acura MDX Sport Hybrid Advance. Picked it up yesterday! Certainly missing the low-end of the EcoBoost, but pop this thing in Sport/Sport+, it moves out nicely! Wanted a little more room for road travels this summer, so here we are. White with expresso interior.

 

[Lowrider1976]

2019 Acura MDX Sport Hybrid Advance. Picked it up yesterday! Certainly missing the low-end of the EcoBoost, but pop this thing in Sport/Sport+, it moves out nicely! Wanted a little more room for road travels this summer, so here we are. White with expresso interior.
View attachment 83457

So this is in the what did you do to your sho today thread... as in I cheated on my mks yesterday? Lmao. Nice ride though bud!

 

[Zpak]

...And the worst part is you let the MKS see the new girl.

 

[RonPorter]

I believe you. It sounds pretty clear you’re talking from experience. Road course racing? I’m on my second set of drilled and slotted rotors since 2016 and from daily driving to drag strip fun I’ve never had or seen the above mentioned problem. I know the rotors I’ve used aren’t top of the line. I have never taken the car on a road course/circuit track though. Is it safe to say that we’re unlikely to ever have that issue unless we want to start doing repetitive road course racing?

Yep. Hard use. There's zero benefit to the drilled holes, anyway, except to look cool at a cruise night. This ain't 1972, those gassy asbestos pads haven't been made for years.

 

[RonPorter]

Why do most of the high end Euro cars come factory with drilled rotors? Asking for a friend.

Porsche stated years ago, because of "customer demand". And they and MB don't just drill them, they put in a lot more work to minimize the cracking potential. And you don't see F1 racers with drilled rotors.

 

[RonPorter]

Ok, so they're non-vented rear rotors. Venting holes might actually help with cooling then. Obviously the rear brakes don't see as high of temperature gradient (shock loads). Thicker materials such as solid rotors can tend to crack more easily but with the lower heat gradient I think you would be safe. Try and add some chamfering to the vent holes if none are present. It helps to redirect the stresses around the holes rather than through the holes.

Solid rotors are the least likely to crack. The mantra that the SHO track folks have followed for years is to buy the cheapest blank rotors you can find, and spend the money on pads. After going into my 26th year of track days, I have never had an issue of "warping" rotors. As I've mentioned in the past, 10 years ago I ran $350 worth of Carbotech XP10/XP8 pads on my stock 10.2" rotors on my white 89. Ran long, fast tracks like BIR & VIR with zero brake issues.

 

[RonPorter]

Most Mercedes ceramic rotors that I have seen are just drilled. No slots, grooves, just holes. I would think Mercedes would know something if those rotors are starting at 5K a pop.

Ceramics are a whole (pun intended) different kettle of fish. Those holes aren't drilled, AFAIK, in the ceramic rotors. And Porsche's comment about holes for customer demand were in reference to their ceramics.

 

[SM105K]

Porsche stated years ago, because of "customer demand". And they and MB don't just drill them, they put in a lot more work to minimize the cracking potential. And you don't see F1 racers with drilled rotors.

Customer demand. I have a hard time believing it is just that. There has to be some type of performance reasoning behind it. Also, F1 rotors are drilled. They are drilled on the diameter of the disc for better heat dispersion.

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