Quote:
Originally Posted by Dean
Revival part 2...
OK, I have been doing more research on this and have a basic question... Why would anyone want to hook either an A/O separator or catch can back into the intake especially on a race car? It is post combustion, so what is the compelling reason to add any volume post MAF sensor?
I would think you would be far better having it vent filtered to atmosphere. Something like this:
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Vent to atmosphere is messy, stinky, and not legal for emissions (the latter being the biggest reason most people don't use them, as they're dead obvious at inspection, but that isn't really a big deal in NV since most places are lax on inspections). On a racecar, emissions and the mess really don't matter much, and it's always nicer to not blow exhaust back into the intake since it lowers the effective octane of the intake charge.
But for a street car, it's much cleaner not to have something mucking up the interior of the engine bay, plus you get the vacuum of the intake to assist the catch can, rather than relying on crank case/valve cover pressure just to blow everything out.
IMO, on a street car, I'd run a pair of closed-loop catch cans; on a race car, I'd run an open vented air/oil separator that drains back to the crank.