Thank you Brian86
Well, that explains it all; I clearly had my facts wrong.
My understanding was what I wrote and with that, I had read the butterfly was always fully open...... It's not the case I learn now and that seems way more logical.
The oil separator: if you have that line or not on your intake, the connection is there on the thing, right? For vacuum or for atmospheric pressure.
What I meant is that in my particular case, there is no vacuum hose, but the opening on the separator is fully closed off.....so it has no atmospheric reference either.
What I think that does, is the membrane is harder to close as the room above the membrane sucks its own vacuum.
Thanks again!
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