Kirkham on eBay

[ng8264723]

Your not suppose to have a breather with a pcv.
chris

[rsimoes]

Originally Posted by ng8264723

Your not suppose to have a breather with a pcv.
chris

I was told that I needed both. . .

[sidewaysinthird]

Rob,

Your's has to be one of the best builds I've seen, or at least one of the best documented. The car is simply fantastic. Good luck getting everything tweaked to your preference. I'm glad you didn't sell it also.

By the way thanks for the wonderful build page!

Mike

[Chaplin]

Originally Posted by rsimoes

I was told that I needed both. . .

you were told correctly.

[kris-kincaid]

How is clean air supposed to get in the engine? The PCV valve has to suck something.

Originally Posted by ng8264723

Your not suppose to have a breather with a pcv.
chris

[onefastmustang]

Originally Posted by ng8264723

Your not suppose to have a breather with a pcv.
chris

Sure you are.. When the PCV sucks all of that poison out of the engine the engine needs to get fresh air from somewhere. I just went through this with the BAR here in California.

[turnpike boy]

PCV systems vent off a POSITIVE crankcase pressure that arises from blowby - a mixture of air, fuel vapor, and oil vapor forced past the piston rings into the crankcase. If you don't vent this pressure it will eventually find its' own way out - past a gasket somewhere, generally.

You do NOT need a breather to make this system work - on the contrary, a breather circumvents proper operation by giving the system something to consume OTHER than crankcase vapors. What you do need is a properly-sized PCV valve, one that is sized in accordance with the expected volume of vapor.

This is why PCV systems replaced breathers in the first place. Breathers allow those vapors out into the atmosphere; PCV's pull them back into the engine to be burned off with the normal mix.

[turnpike boy]

And - by the way - a PCV valve essentially closes during hi vacuum periods, preventing hi vacuum in the crankcase. This is why you connect to the manifold directly....if you put a breather in the system, you are putting a comparatively large quantity of unmetered air directly into the intake system, with resultant screwy results - unsteady idle, weird metering, rough/rich/lean running, etc.

What you need is the right PCV valve. You might have to do some research on this but the info is out there.