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Re: Catch Can
the black stuff in the ports, before the clean bowl area around the valve, is what would be building up on the back side of the valve in a direct injected engine. add to that any oil that may be coming down the valve stem as well, which probably wouldn't be much unless your engine is worn. with the tolerances of the newer engines they use a light grade synthetic oil so there is possibly more oil mist inside the engine to get sucked up through the pcv system and drawn into the intake. old engines simply used a vent tube that dumped out below the engine, a reason why there would be a spot of oil on the ground where they parked sometimes. on some newer engines, not necessarily the LS ones, the ventilation system is lacking on one cylinder head and the sludge builds up on that side and causes issues with cam phasers etc.
anyway, a pic is worth a thousand words so hopefully somebody benefitted.
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