Ad0911

Greg just gave the one true answer. It is the same effect that breaks the small belt within the double distributor of the 964. Aftermarket ventilation setups cures that problem.

LEADASS

Dude, You get your bud to blow some great weed into the passenger side, while you take a hit off the driverside. Major shotgun.

Ad0911

???????????????Is it something I said?

RyanPerrella

I always thought that the vents in the cam belt covers were a means of venting the pressurized air created by the ignition rotor, which at high speed acts as a sort of supercharger.

Instead of venting to atmosphere, Porsche in their infinite wisdom say that by venting it into air intake tube, it created an extra 4 psi of lets call it boost and when tested against an early mule without the vent going into the intake tubes, they found another 47.5- 48.5 HP (The exact number isnt known however, but its somewhere in between the 2.