Thanks Jeroen, that really looks good. 150C reduction is really significant. What diameter are the hoses? Do they connect up to the slots in the spoiler or sit below that?
Agree Steve, I've been having difficulty getting rotors recently as Brembo and others have decided to obsolete them (BMW E21 323i). They aren't something to airfreight in either. However, I've found one supplier left in Australia so I've got a couple of sets coming in. I try to have a very light skim then hopefully I can get a couple of skims before the rotors get to the minimum thickness of 20.4mm (new they are 22mm).
I really don't know the dia. These pics are over 10 years old and the mod was done before that. They slot in the existing holes of the front spoiler but these are a bit widened to accept the hose.
There was a big brake overheating problem at that time and even no grease in the front wheelbearings after a race. That was solved by using silkolene rg2. Due to homologation it was std 13 inch rims. At first the hose was just blowing air on the disc face but in real life this does not work at all. The way shown the air is blown in the centre of the disc and blown through the vented part of the disc and escapes at the outside. Forced air is the maximum use of the vented disc principle and the secret of cooler discs.
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