I have no idea if anyone else came up with this also, but...on the passenger side valve-cover it just has an elbo with a rubber tube that runs to the throttle body...I was wondering what would happen if you use the vacuum from the pcv on the drivers side valve cover to also drive the passenger side one....would it improve anything? could this be done? I thought about useing a tri-connector of some sort to connect both hoses....what do you people think? or am i just off my rocker....hehe...was a thought...

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Problems every other day with the car (probably not a mod, but to me it sure makes a difference)

 

Branz,

Good question, but it is apparent that you have the PCV vent tube confused with the PCV valve. The PCV valve in the left (drivers') side rocker cover has a vacuum applied and removes air from the crankcase. The vent tube on the right head is teh supply of air to the crankcase. The air flows from the throttle body, through this tube, and through the engine. Applying vacuum to this fitting would result in effectively no PCV system, and the resultant sludge and contamination of the crankcase. Since there would always be more vacuum in the case than it was designed to withstand, you might actually hinder some of the upper cylinder lubrication by sucking air past the rings and clearing oil off the cylinder walls. A remote possibility, but it COULD happen to some extent.

The reason the vent tube is connected to the throttle body is that the air drawn through the crankcase by the PCV system ends up in the intake manifiold. Since this air is part of the combustion process, it must be metered by the MAF so that accurate fuel delivery can be calculated. For the same reasons, you should never use a breather-type oil filler cap on the rocker covers of a MAF-controlled engine. Since it would also skew the MAP sensor on a non-MAF fuel injection system, the mixture would also be lean on SD cars with a bypassed PCV vent or breather oil cap.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Yeah, the only time I've seen exceptionally high crankcase vacuum used is in racing engines with low tension oil control rings on the pistons, and they usually use restrictor plugs in the drainback holes of the block to help more oil stay in the top end of the engine.



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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."