034 billet PCV check valve revisions / differences

[Matt Devo]

somehow, in the course of my rebuild, I managed to mix up the two 034 billet PCV check valves I have, and I can't figure out from searching how to determine which is the original and which is the new/revised version. And yes, I have no idea why I even kept the old one. But anyways, here are the two valves:





the valve on the left has the logo on bottom, doesn't rattle when shaken, and when depressing the ball, appears to have multiple ports/pathways for the air to flow.

the valve on the right has the 034 logo on side, rattles audibly when shaken, and when depressing the ball, appears to have a single port/pathway for the air to flow.


Any thoughts? @034Motorsport ?

[diagnosticator]

I don't know which one is the new version, but the valve that rattles when shaken, will flow more crankcase vapors, if the internal ports flow the same.

[walky_talky20]

I'm looking at the "updated" 034 PCV valve they sent me a while back. Quite a while back, actually - as it was just after they had come out with the "revision".

My revised valve is exactly like the one on the RIGHT in your photo.
- It has the 034 logo on the side
- It rattles easily when shaken
- It has only 1 "bypass channel" for internal airflow < this was the major revision, I believe.

While I don't have my original, unrevised valve sitting here (it's still installed in my car), I distinctly remember here being multiple bypass channels around the internal cylinder. 3 or 4, I can't remember. It did seem like the spring may have been stiffer as well, but that's asking too much of my memory.

[Matt Devo]

I don't know which one is the new version, but the valve that rattles when shaken, will flow more crankcase vapors, if the internal ports flow the same.

they aren't/don't, and I don't have the equipment necessary to measure flow compared to the stock valve, hence my inquiry :)

I'm looking at the "updated" 034 PCV valve they sent me a while back. Quite a while back, actually - as it was just after they had come out with the "revision".

My revised valve is exactly like the one on the RIGHT in your photo.
- It has the 034 logo on the side
- It rattles easily when shaken
- It has only 1 "bypass channel" for internal airflow < this was the major revision, I believe.

While I don't have my original, unrevised valve sitting here (it's still installed in my car), I distinctly remember here being multiple bypass channels around the internal cylinder. 3 or 4, I can't remember. It did seem like the spring may have been stiffer as well, but that's asking too much of my memory.

exactly what I needed, thanks. I was pretty sure (based on the picture on 034's site), just wanted confirmation before reinstalling.