17prospective buyer

http://www.ebay.com/itm/Porsche-944-...a7c528&vxp=mtr

Check this out. It seems sort of like the Provent, in fact it probably is a MANN or MAHLE manufactured product. Except this could be integrated into the 928 filler neck couldn't it?

I just thought it was interesting to see, i didn't know the 944T came with an oil separator, but i guess i can see why with all the blow by from the increased air density from the turbo.

fbarnhill

It looks a little like a provent but not sure how it would work with a 928.

Good luck,

GlenL

That unit is pretty tall. Maybe 14" so hard to fit. It's on all 944s and not just the turbo.

I'd go with a different unit if going to the trouble of connecting it up. Those connectors with the o-rings press into the engine. It'd be a pain to make adapters for them.

AO

Nice find. I've not heard of any 928 guys using this. The price is right for sure. It would be interesting to ask the 951 guys if they have any issues with it. Some of those guys run some pretty high boost.

Finding a mounting location on our cars is always the challenge. The oil fill is a nice feature, perhaps.

hacker-pschorr

Until you cut open the 944 unit you have no idea how it compares to the provent. Most air / oil separators look similar on the outside......

Some have chambers to knock the oil out of suspension, others have a swirl setup, others mesh screens, some a combination etc.

SAAB went through six versions of their separator starting in 1996 before they got it right. They all look identical on the outside.
I've cut open four of them and the changes inside are very subtle.

Lizard928

it took me 3 revisions to finally make one that worked 100%

17prospective buyer

I see. So you have to look a little closer to see the principles behind how they work.

I'm not really interested in a separator as of now, i just think it's interesting to see all these parts i never even thought existed (have a long way to go before i think about modifying the stock crankcase ventilation system). With me i'm used to working on run of the mill cars with the same configurations. Try looking for a simple PCV valve on a 2000 BMW 528i or a 928 for that matter, haha. You never stop learning in automotive. Just when you think you know something you realize that you know **** compared to other people.

But on another topic about crankcase ventilation was there not some people on here using the stock 928 air pump as a crankcase vapour scavenging pump? With a separator/filter in between the pump and crankcase orifice it would make the most sense to have a moderate vacuum all the time (1-2" Hg?), isn't this much simpler than any of the modifications to the stock system?

Someone learn me, you can't really learn about this case from automotive textbooks.

Lizard928

the stock air pump is not acceptable for use as a vacuum pump in the crankcase.

If you want vacuum in the crankcase, do it right with a proper vacuum pump!