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So I'm getting towards the latter stages of my turbo/fuel injection install on my 70 Ghia. I'm trying to figure out where to route the crankcase ventilation. I obviously don't want to keep the same method as before, since it will end up putting boost pressure into the crankcase. What's the preferred method for crankcase ventilation?

I have a empi bugpack breatherbox.
Bolted down to the generator mount plate against the fan housing.
1 to left cover, 1 right and the other one to the oil fill tube.
Worked fine NA.
Dont see no problems when turbo

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rubenski wrote: ↑Mon Nov 05, 2018 8:55 am I have a empi bugpack breatherbox.
Bolted down to the generator mount plate against the fan housing.
1 to left cover, 1 right and the other one to the oil fill tube.
Worked fine NA.
Dont see no problems when turbo

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Just vented to the atmosphere? I'll be venting from the distributor hole and the oil filler.

I was vented to atmosphere from the oil fill on my last one and it seemed fine. This time I will also vent both valve covers.

I was considering pulling some crankcase vacuum by tapping into the plumbing on the intake side of the turbo, but from what I read the oil mist it pulls in may promote detonation. I guess I can vent to the atmosphere for now, and if I see a need for crankcase vacuum I can install a small electric pump or something.

Vent case and heads to breather box, allows it to drain any oil build up back down.

I dont think i will vent at the distributor hole.
Never had issues, oil fill tube is connected to the case so basiscly the same

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I vent at the "Mexican" alternator stand/oil filler and both valve covers up to a breather box on the firewall. -8 all 3.

After watching a video several years ago with plexiglass windows in the valve covers and seeing the difference when the valve covers where vented and non vented on a running motor, it was amazing how much oil ended up in the heads with vented valve covers. I vent both sides of the case to a catch can.
I want my case to be a low pressure area so the oil returns to it. If the valve covers are the low pressure area, where does the oil end up?
Kenric

woodsbuggy1 wrote: ↑Mon Nov 05, 2018 2:09 pm After watching a video several years ago with plexiglass windows in the valve covers and seeing the difference when the valve covers where vented and non vented on a running motor, it was amazing how much oil ended up in the heads with vented valve covers. I vent both sides of the case to a catch can.
I want my case to be a low pressure area so the oil returns to it. If the valve covers are the low pressure area, where does the oil end up?
Kenric

It has not been an issue with my engine. if it fills up i don't know but i have 7QTS of oil and your on boost for just a few seconds so it does not matter much. I dune with mine so it is on boost a lot. I go through water as fast as fuel sometimes LOL

woodsbuggy1 wrote: ↑Mon Nov 05, 2018 2:09 pm After watching a video several years ago with plexiglass windows in the valve covers and seeing the difference when the valve covers where vented and non vented on a running motor, it was amazing how much oil ended up in the heads with vented valve covers. I vent both sides of the case to a catch can.
I want my case to be a low pressure area so the oil returns to it. If the valve covers are the low pressure area, where does the oil end up?
Kenric

Makes sense, but I have not had an issue yet. At Bonneville I am at 5-7500 rpm and full boost for about 1.5 minutes once I get up to 4th gear, pull through 4th, and hold it for a mile.

I vent to a RLR type breather box. My valve covers are not vented however my heads are and the oil is returned to the sump.

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Check out these photos from Muffler Mike's website:

http://www.mufflermike.com/news2000.html

This is a shot of the right side valve cover at 5000 rpms - very little oil pooling up in the valve cover

http://www.mufflermike.com/791.jpg

This is a shot of the left hand side at 2500 rpms -its beginning to fill up with oil - 3000 rpms is cruising speed on the freeway for most bugs/ghias. And you thought your oil was in the sump and doing it's job!

http://www.mufflermike.com/751.jpg

This shot is with rpms 'coming up' to 5000 rpms:

http://www.mufflermike.com/752.jpg

And at 5000 rpms the left hand valve cover is FULL of oil!

http://www.mufflermike.com/753.jpg

Sorry, just realized the pics are dead.
Kenric

Interesting. I've never seen heads with returns to the sump.