I posted the part number to a check valve I used to sell that you can put inline with any PCV and it works great. Im sure its just a matter of time before a vendor takes the part number and starts selling it as their own great idea.... not like that hasnt happened before.
PCV's really dont seal well under boost. A lot of people sold inline check valves to fix that but the problem with all the valves is that they wont open correctly under vacuum. The valve I sold could be modified to open under all vacuum conditions.
Do a search for clippard on here and see if it returns any results. If not, Ill dig the part number up. I know Ive posted it here before. It's a Clippard valve.. really cheap (Like $6.00 I think) and works great.
http://www.clippard.com/store/display_details.asp?sku=MJCV-1
Found your old link. Just not sure about how you modify them. I understand "open it up and cut the spring", but not sure how a check valve works with a cut spring.
The spring is what holds it open. Cutting some of the spring allows it to open and close easier. It still seals completely under pressure and cracks with even a small amount of vacuum. I guess you need to open one up to understand but once you do, it makes perfect sense.
Vacuum sucks it open; boost pushes it shut. At least that much I understand.:biggrin:
Now for the part I'm not clear on: by "cut the spring" do you mean removing it completely?
This is an OLD thread...but I was wondering how much spring you cut off that check valve. I havent searched it yet but will after posting. ThanksThe spring is what holds it open. Cutting some of the spring allows it to open and close easier. It still seals completely under pressure and cracks with even a small amount of vacuum. I guess you need to open one up to understand but once you do, it makes perfect sense.
Crap cant exactly measure vacuum at cruise. Damn Winter!You want it to have just enough spring pressure to barely keep it closed. The reason for the mod is because the cracking pressure is usually greater than the amount of vacuum the engine makes. When that happens you basically have a plug instead of a line.
Measure your vacuum at idle and cruise. Cut that number in half and that's roughly how many pounds you need to be below.
I took the Kirbans PCV off and found that is was stuck(its working now) but I have the clippard valve.I cut the spring in half. I've even removed them completely and it works fine in that regards too. The Clippard stuff is great and well made.
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