http://www.saacforum.com/index.php?topic=251.msg123410#msg123410Discussion from a different topic was regarding MK-IV turbine wheels vs the 6 spoke "JWA/BRM wheels"
I had an opportunity to visit The Henry Ford and view the new display "Racing in America".
J5 has the revised front brake cooling arrangement used at Le Mans, i.e. removed cooling port in the front body, moved the hose pickup to the back panel of the radiator outlet,
thereby picking up the "warmed" air coming out of the radiator, the wheel turbine effect would draw the air thru the rotor and exit out the wheel vanes.
This photo is the LH rear, the RH side is not viewable without getting into trouble with the staff!
just informational to the discussion
regards,
jim p