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Old 05-28-2010, 05:48 PM
acr acr is offline
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Is there a "Best" Vacuum Source for PCV?

Which of the common PCV air pick up methods do you think is more efficent &/or prefer? A breather in the valve cover, or a fitting & hose from the bottom of the air cleaner to the valve cover?

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Old 05-28-2010, 05:54 PM
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Quote:
Originally Posted by acr
Which of the common PCV air pick up methods do you think is more efficent &/or prefer? A breather in the valve cover, or a fitting & hose from the bottom of the air cleaner to the valve cover?
I place the pcv valve in the passenger side valve cover and run the hose to the base of the carb. Works best for me , and it's usually how it is done from the factory also or use to be anyway.JMO


Cole
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Old 05-28-2010, 06:39 PM
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Cole, correct. But I'm asking about the other side valve cover where the fresh air is picked up & circulated thru the crankcase, back up to the PCV. The two most common systems (there are others) use either a push, twist, or clamp in breather that fits in the valve cover & picks up air arond it. The other style has a fitting that screws/clamps into the air cleaner where it pick's up fresh air & sends it into the valve cover thru a hose.
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Old 05-28-2010, 07:47 PM
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IMHO the clean air from the air cleaner into the system is best. The push on breather in most cases will also suffice, but combined with a style that has a hose connection as well as some expanded metal inside the breather to the in-side section of the air cleaner will give the best filtration.
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Old 05-28-2010, 07:54 PM
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The air cleaner would be nice, clean air, for sure. I think the extra work to plumb an aftermarket filter base is off-putting for some guys. That, and that the filter assembly can't just be whipped off by removing the wing nut is probably why most end up using a v-cover mounted breather.

But I agree the v-cover breather will work as well, as long as the breather has good filtration.
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Old 05-28-2010, 11:36 PM
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Good idea only with a large like 14" air cleaner. If you use one of those little bitty air cleaners, the breather hose to the cap will be competing with the PCV valve because of the vacuum created by the carb. trying to suck air through a too small air filter.
If you look at an older stock GM air cleaner, the breather hose was hooked up to the air filter housing on the side with a small foam filter inside before the air filter. This small foam filter had to be changed periodically as it would get coated with oil from the breather cap. I never did like that and always changed the breather cap to a style without the hose.
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