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Old 11-28-2010, 07:56 PM   #1
Sevillian273
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Default PCV Airflow

While the 2001 SL2 was running I popped the PCV valve out of the grommet to take a look at it and I noticed strong air pressure coming out of the hole in the valve cover. ???

It doesnt smell like exhaust but it does seem to 'pulse' with the engine kind of like the air output of a belt driven smog pump. Is this normal?? 100K miles on engine.
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Old 11-29-2010, 08:54 PM   #2
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Default Re: PCV Airflow

cant answer your question but I am searching for PCV info too.

mine is full off fresh oil and seems to be sucking oil out of the motor
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Old 11-29-2010, 08:57 PM   #3
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Default Re: PCV Airflow

That is the way they work. As the engine wears you get more blowby and it ends up in the crankcase. These blowby gases are exhausted through the PCV system.
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Old 11-29-2010, 09:30 PM   #4
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Default MY PCV ?'s

Quote:
Originally Posted by OldNuc View Post
That is the way they work. As the engine wears you get more blowby and it ends up in the crankcase. These blowby gases are exhausted through the PCV system.
Couldn't that pulsing also be caused (at least partially) by the travel of the pistons, e.g., the movement of crankcase air on the non-business side of the pistons? Or do those cancel out among the 4 pistons?

Also, air pollution aside, what would happen if one were to disconnect and plug the PCV vacuum source, and vent the crankcase to atmosphere (with perhaps a filter to minimize oil fouling of the engine compartment). Wasn't this the way it was done prior to PCV?

Thanks!
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Old 11-29-2010, 09:33 PM   #5
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Default Re: PCV Airflow

The average outflow is blowby and the pulsing is caused by the action of the pistons.

Yes, the original approach was to vent the crankcase through a wad of coarse steel wool to the ground. Went away with the 1964 model year. It did keep the center of the road well oiled though.
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Old 11-29-2010, 09:37 PM   #6
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Default Re: PCV Airflow

One thing I've yet to find out with the bypass setup some people install in the PCV line is...what do you do with the oil that goes into the catch-can?
All well & good it's not being burnt anymore, but if you don't/can't put it back into the oil system how does it save anything?
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Old 11-29-2010, 09:56 PM   #7
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Default Re: PCV Airflow

You can dump it back in the engine if you want.
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Old 11-29-2010, 09:59 PM   #8
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Default Re: PCV Airflow

Quote:
Originally Posted by fetchitfido View Post
One thing I've yet to find out with the bypass setup some people install in the PCV line is...what do you do with the oil that goes into the catch-can?
All well & good it's not being burnt anymore, but if you don't/can't put it back into the oil system how does it save anything?
How about adding the catch can's oil to the jug you plan on using to recycle your next oil change draining?
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Old 11-29-2010, 10:24 PM   #9
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Default Re: PCV Airflow

If you use the jelly jar / small Mason jar option, as some do, you can simply put a standard lid on it and label and sell it as blackstrap molasses.
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