This is a first for me... I was checking my car to get ready for next week and look what I found... This is from a week at the Glen in 90+ degree weather. Probably melted when sitting in the pits after the race and the heat was just radiating off the brake disc.

 

the good news is your brakes are working really well!

 

I love it!

I would seriously email that to Porsche Motorsport. The high-temp plastic is not supposed to do that no matter how hot it gets.

 

ROFL, you have never dealt with Porsche Motorsports have you!?!?!

 

Ed, stop using that middle pedal, it's not worth it.

Another reason to switch to PCCB...

 

How many cooling laps?

 

You probably nailed it on the head. Typical is only 1/2 lap. I am trying to be more gentle on my cool down laps and just use downshifts to slow the car as not to use the brakes. Hope it helps. Gave me a good excuse to upgrade to Cup ducts anyway.

 

If it is a case of not-as-heat-resistant-as-we-thought plastic material, are the Cup ducts made from different material?

The possibilities are scary, if this material melts perhaps it can ignite. There's been a ton of material engineering advancements made in plastics over the last half-decade (think nano-tech!), but if it's high-performance it's usually not cheap and sometimes difficult to work with ...wait doesn't that cover a lot about these cars? hee hee.

Hopefully it's got a ignition temp that's well above it's droop-and-fall-off temp. I've worked with so-called "fire-proof" plastics for office furniture (cubicals) that will totally liquify long before ignition, but their strength and dimensional stability was abysmal.