Quote:
Originally Posted by Joshboody
that's bold, but maybe semi-ok. this would leave the boosted side open, since the off boost side closes the boosted side check valve with vacuum i'm assuming. BUT boosted side would be working on less, or no vacuum at cruise and idle. Your cc pressure has to be higher with this setup. And then a OCC would compound this.
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hmmmmm let me get this straight...the checkvalve marconi capped off, now when his car is under boost air is being pressurized by the turbos into the intake manifold and has no way (in case of say that checkvalve going bad, being clogged or just capped off as what he's done) of entering back into the crankcase. This is GREAT in eliminating additional crankcase pressurization due to boost from that side and solves the "on boost" part of the equation. The other checkvalve (the one OCCs are hooked up on) will be open under boost and vent to whatever you're running attached to it (breather or an OCC or back to the rear intake pipe)...That solves the acceleration/boost issue as now you're doing 2 things perfectly: 1) not pressurizing the crankcase under boost and risking damage to your engine seals and turbo seals and 2) not letting vacuum in the intake manifold pull out oil vapours from the engine and clog up (carbonize) your intake valves.
Then if we look at what happens under decel/cruise/idle though (which is what the car sees vast majority of the time unless its a dedicated race car)...the checkvalve we capped off will obviously remain closed so any built up crankcase pressure during our onboost run will not vent using vacuum in the intake manifold when on decel/cruise/idle...the other way out (other checkvalve) will also be closed under decel/cruise/idle because the PCV outlet checkvalve that goes out to the OCC or rear intake pipe will be closed as vacuum has closed it (not a very tight seal as I've noticed yesterday by blowing air from my mouth through it) ...UNLESS...you remove that checkvalve!
So with the latest Big Tom setup (no checkvalve) and the other checkvalve that closes to the intake manifold capped off as marconi indicated we should actually be all good...
a vacuum pump at the crankcase outlet on top of that would totally complete the picture (triggered when the car goes into vacuum) but I'm not sure how complicated that'd be to setup/configure..
what do you guys think?