Hydraulic cam followers

[Gelbster]

There is an interesting hint in the Bentley manual regarding the risk of damaging lifters if only oil-foam instead of liquid oil reaches them.
Porsche revised the de-foamers in the sump for the 987. They are quite different to the originals. I fitted the latest style because I have a paranoia about foam in a flat engine without a dry sump.I also fitted my own peculiar version of an aftermarket deep sump+horizontal baffle arrangement. It adds 2qts and ensures the pickup is submerged at all times.
I also plan to use engine oil with high anti-foam additives/low detergent. The jammed lifter problem is so common on the flat 6 but so rare on the I6 and V6 engines that use the same INA lifter .... well maybe it is the foam issue?
It may all be nonsense ,I know.

[Gilles]

Originally Posted by Gelbster

There is an interesting hint in the Bentley manual regarding the risk of damaging lifters if only oil-foam instead of liquid oil reaches them.
Porsche revised the de-foamers in the sump for the 987. They are quite different to the originals. I fitted the latest style because I have a paranoia about foam in a flat engine without a dry sump.

Gelbster,

I remember reading that Vision Motorsports recommends using the earlier type 996 'aerators' versus the 987's because they promote a better separation of the oil and air (foam)...

.