Currently I have mine vented through a catch can stuffed with stainless wool, to atmosphere, under my car. It smells like shit when I'm idling on a hot day or after a drive, and I can see fumes coming off the underside of my car. I have a bit of blowby, so I am trying to deal with it in a sort of "emissions friendly" way (more like preserving my lungs and nose).
PCV system is supposed to keep a slight vacuum on the crankcase at almost all times, preventing oils leaks and vapor emission. I've been thinking a lot, and I want to reintroduce a vacuum to the crankcase vent, while making it friendly for performance and HP. There are a few requirements for a proper turbo PCV system.
1. Oil vapor drops octane, so there can be no burning of PCV vapors while on boost. Idle and cruising conditions are ok.
2. A near-continuous source of vacuum is required.
3. No oil in the turbo inlet, intercooler, or charge pipes. So sticking PCV on the front of the turbo is not good enough. and it makes everything nasty.
I drew up a switching PCV system to satisfy my needs, but I am unsure whether it can be done reliably. I know a few people have attempted this but I cant find their threads.
At idle and cruise and all other vacuum pressures, the vapors get burned off like bmw intended from the factory. Into the intake manifold and burned. On WOT, this system switches to dumping everything into the exhaust, after the catalyst. Don't want to crystallize and plug your cat. Not my favorite way of expelling oil vapor, but its much easier on me while I sit at a drive through. You don't smell your exhaust when moving.
The "vapor condenser" could be anything from an oil cooler with a drain line to a factory BMW oil separator like the ones on e46's or motorsport ones on m5's.
A challenge is finding a proper check valve. Now on Mcmaster I have found some low-cost (5492K53, polypropelene, rated 140F max temp) but light weight check valves that flow enough for our engines.
Thoughts?
PCV system is supposed to keep a slight vacuum on the crankcase at almost all times, preventing oils leaks and vapor emission. I've been thinking a lot, and I want to reintroduce a vacuum to the crankcase vent, while making it friendly for performance and HP. There are a few requirements for a proper turbo PCV system.
1. Oil vapor drops octane, so there can be no burning of PCV vapors while on boost. Idle and cruising conditions are ok.
2. A near-continuous source of vacuum is required.
3. No oil in the turbo inlet, intercooler, or charge pipes. So sticking PCV on the front of the turbo is not good enough. and it makes everything nasty.
I drew up a switching PCV system to satisfy my needs, but I am unsure whether it can be done reliably. I know a few people have attempted this but I cant find their threads.
At idle and cruise and all other vacuum pressures, the vapors get burned off like bmw intended from the factory. Into the intake manifold and burned. On WOT, this system switches to dumping everything into the exhaust, after the catalyst. Don't want to crystallize and plug your cat. Not my favorite way of expelling oil vapor, but its much easier on me while I sit at a drive through. You don't smell your exhaust when moving.
The "vapor condenser" could be anything from an oil cooler with a drain line to a factory BMW oil separator like the ones on e46's or motorsport ones on m5's.
A challenge is finding a proper check valve. Now on Mcmaster I have found some low-cost (5492K53, polypropelene, rated 140F max temp) but light weight check valves that flow enough for our engines.
Thoughts?
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