more aos thinking ...

[JFP in PA]

Originally Posted by LAP1DOUG

Perhaps the ultimate solution is dry sump system. Those positive displacement scavenge pumps can pull a lot of vacuum for crankase ventilation, and a properly configured oil tank is a great air-oil separator.

Speaking of which, a guy that I autocross with who has a 2007 Carrera S told me today that the Carrera S model in particular has a dry sump system. I thought all M96 / M97 / 9A1 engines all had the same pseudo-wet sump.

Sorry, but having run several dry sump engine setups over the years, I can assure you that you still need an auxiliary vacuum source (read a belt driven vacuum pump) to properly evacuate the engine case. The dry sump pumps, even a multiple stage units, do not create enough case vacuum to do the job.

As for your autocross guy, his 2007 Carrera S has the exact same AOS setup and wet sump that you and every other M96/97 does……………

[j.fro]

I know I'm gonna get hammered by the naysayers, but here's my setup: inline aftermarket AOS plumbed between the crippled factory unit and the intake.
My car runs well, I'm to 155,000 miles, and crikey she delivers at the auto crosses!

[j.fro]

Here's a photo:

[LAP1DOUG]

Originally Posted by j.fro

Here's a photo:

Interesting - where did you get this?

[j.fro]

It's sold through Jegs. Moroso makes a similar unit that's about twice as large and billet aluminum (and twice as expensive).

[Homeboy981]

Originally Posted by j.fro

Here's a photo:

Clever. And you always seem to have good pics too! I am hard-pressed to keep with the upgrades you have done so far and you keep pulling them out of your, uh, well trunk in this case!