See, the main take aways for me in that diagram are:
*Not under load, fresh air is flowing into the crankcase vent, and into the VC. It doesn't really matter at that point whether you have an oil separator or catch can, or nothing at all.
*Under load, blow-by is moving up out of the crankcase vent, and out the VC. So if the VC vent is routed to a catch can, it will catch any oil before it makes it back to the intake or is vented to atmosphere. At that point, a separator might reduce the amount of oil that makes it to the catch can, but otherwise it doesn't matter.
From personal experience, if you run the VC hose back to the intake (stock configuration) without an oil separator, it probably gets some oil in your intake... but I've been running my high mileage beater like that for about 60,000 miles with no ill effects. Also from personal experience, if you run a breather filter on your VC, without a separator, it's going to drip oil on your transmission.
It would probably do that even with a separator on there.
*Not under load, fresh air is flowing into the crankcase vent, and into the VC. It doesn't really matter at that point whether you have an oil separator or catch can, or nothing at all.
*Under load, blow-by is moving up out of the crankcase vent, and out the VC. So if the VC vent is routed to a catch can, it will catch any oil before it makes it back to the intake or is vented to atmosphere. At that point, a separator might reduce the amount of oil that makes it to the catch can, but otherwise it doesn't matter.
From personal experience, if you run the VC hose back to the intake (stock configuration) without an oil separator, it probably gets some oil in your intake... but I've been running my high mileage beater like that for about 60,000 miles with no ill effects. Also from personal experience, if you run a breather filter on your VC, without a separator, it's going to drip oil on your transmission.
It would probably do that even with a separator on there.
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