GTV6 vented rotors

[Doug Gould <wdgould@domain.elided>]

Brian

Vented rear rotors help, but the problem with vented rotors is that they 
really need to be fed air under pressure to the vent inlets at the centre 
of the rotor in order to be most effective. Vented rotors are not hugely 
effective at pumping air on their own. So, the best solution is to fit 
vented rear rotors with ducting to a cuff around the inlet to the rotor. 
Take a look at a production racecar and you should see this arrangement. I 
have done this for my front rotors, but the rears are just a bit too 
difficult at the moment. When I get to it, I plan to make a duct about 11/2 
inches deep and about 8 in wide to fit under the dedion tube then 
transforming (via the NACA profile) to about a 3 in round duct leading up 
to the discs.

Another thing on the list of things to do is to put some wool tufts on the 
car to see where the airflow really goes.

There are other benefits to vented rear rotors, however, which include a 
greater thermal mass so they take longer to get hot and an improved cooling 
profile when the car stops and heat soak starts to set in.

Doug Gould
Melbourne, Australia
1985 White GTV6
1991 Blue 164L
1959 Blue VW Beetle (From Grandma's estate - 43,000 miles)
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