it is more like the carbon is a heat shield itself and it directs the air over the cylinder fins to cool it as it is AC engine

I found Hexcel M-81 which could withstand up to 200 degrees but with complicated curing scheme and I quess it is not out of autoclave one

http://www.hexcel.com/Resources/DataSheets/Prepreg-Data-Sheets/M81_eu.pdf

~~~Everytime I hear sound of demoulding part I have eargasm~~~

You need to use some kind of heat shielding.

link to typical thing used in motorsport

http://www.demon-tweeks.co.uk/motorsport/heat-shielding-protection/pitking-products-cool-tape

Hi!
One of my customers wants 250 degree celsius heat resistant covers for ultra light airplanes. He wants like a lot of them. Normal high temp resins perish at 180 so I would hit prepreg, but isn't that too hot even for it? what do you think? I couldn't find any data sheet about prepreg hdt after curing.
Thanks

~~~Everytime I hear sound of demoulding part I have eargasm~~~