ehall

Thanks George!

Dutch944

So how about this? Not sure if you're running powersteering?

http://www.starvacuumpumps.com/catalog/pumps/

And i've also read something about using the vacuum from the DP, but i'm not sure how the use that..

George D

Sure. Let folks know if they are still making them. This is the easiest way to install a Garrett turbo on our cars and being able to use V-Bands on both sides is a beautiful thing towards ease of removal/install.

marcoturbo

Quick update,

I now run the pcv after the catch can. I still use a cam tower port but I consider buying a 928motorsport oïl filler cap and drill it to remove the pressure from the crank without disturbing the cam oïl flow.

To avoid sucking too much oïl, I put a 1/32" restrictor at the catch can inlet and a second check valve after the pcv just to be safe.

100 miles since the install, there's a light vacuum in the crankcase at idle. It increases when throttle is applied (plastic bag test) and the catch can is still dry. There's a very light amount of oïl in the restrictor area, it has nothing to do with the previous set up (without any restrictor, my IC pipe was full of oïl flowing from the intake manifold...).

I run the AOS line directly to the MAF tree.

I believe there's a quite simple way to solve this issue. As we know, the MAF pipe doesn't provide enough vaccum to suck the crank pressure from the AOS. I wonder if we can't modifiy the MAF pipe to put a kind of "flap" (a very small one) inside the pipe. This way, the air running from the filter to the turbo hits an obstruction which provides a lower pressure area behind it which should help venting from the AOS. If it works for splitter and air dam, it should work for such an application...

ehall

Now that's an interesting idea!

Dave W.

Thanks for all the tips given in this thread. My engine also has some blowby under boost which pushes a little oil out of the AOS vent.

At first I wasn't sure if the threaded plugs on the cam tower were a good location for a vent, so I did a quick test. I simply removed one of the plugs and started the engine. I was prepared to see oil flying everywhere, but to my surprise there was no oil at all. I could feel a moderate puff of air coming out of the hole, but no oil. I revved the engine and still no oil flew out. Then I removed a second plug and started the engine. The puff of air was barely noticeable anymore and there was no oil flying out of the second plug either.

I bought parts and installed a catch can with -8AN fittings and hoses. Here's a couple pics. After 3 weeks of use and regular full throttle pulls there's no oil in the catch can at all. A nice benefit is the oil seals on the engine seem to leak less, probably because there's less crankcase pressure pushing oil past the seals.

Thanks again everyone, my car is a little nicer now.

Tom M'Guinn

Thanks Dave -- great info. My car is in for a little paint work (long overdue) so can't tinker with it now. When I get it back I'll compare this to the T and check valve I added to the AOS vent/drain line. I was able to try my approach for a few days before going in for paining, and I definitely got some oil in the can so will check to see if the cam tower ports produce less. Any particular reason you vented two ports?

Dave W.

I vented two ports to reduce air velocity through the vent lines. If air was moving too fast it might blow oil out. It's also the reason for using -8AN lines.

Thom

Good info, thanks.

Can you just precise if you have the AOS venting to atmosphere or recirculating back into the compressor inlet? Hard to see from the pictures, and it looks like the car is not quite stock.

refresh951

Looks good Dave. Do you still have crankcase vacuum at idle?

PF

What is normal crankcase vacuum att idle? And how can I test if I have exessive crankcase pressure?

Thanks
Peder

Dave W.

No my car is not stock. My AOS line is vented. There's no extra lines on the turbo inlet pipe. I don't have any gauges on the crankcase, but that gives me an idea; I have a spare boost gauge, I wonder if I can just temporarily shove a hose down the dipstick tube and get an accurate measurement?

Tom M'Guinn

I used a bigger hose I could squeeze over the tube, then clamped it on with a hose clamp -- then T'd it down to a hose for the gauge. Worked like champ...

URG8RB8

Or this...

URG8RB8

This pathetic app only allows one pic at a time, Ughh this is so frustrating!!!