PCV conversion success

[38plymouth]

I added a pcv valve to my car by removing the road draft tube and replacing it with a rubber grommet that fit the hole perfectly. I used a little black RTV to make sure it stayed in place. I then plumbed it to the intake manifold hole where the wipers get vacuum. I simply used pipe fitting's to "T" it. I used rubber fuel line between the valve and the intake. I hit a major snag when I started the engine and discovered that the pcv valve just created a massive intake leak. Through trial and error I discovered that a pcv valve is supposed to suck closed when the engine idles( I thought in order to be closed it should stay open) and spring pressure pushes it open when you rev the engine (vacuum drops). I went to napa today and bought a handful of valves and started trying them until I got one that closed at idle (sucks in) and opened (pops back out) when the engine revs up. It works perfect now. In case anyone cares I used napa pcv valve #2-9400. I also learned that you have to leave the breather cap holes open so it breathes. If you block off the holes you won't get vacuum because air has to go in so it can get out. It works great now and I did the wholw thing for maybe $20.

[Normspeed]

Great! I'm going to keep this info for a future install on mine. Thanks.

[Don Coatney]

Glad you got it sorted out and thanks for sharing. Guess I will pass on the VPW used PCV "kit" for seventy five bucks.

[38plymouth]

I'll sell ya a brand new kit for $75! Just kidding. It is actually simple to do, the hardest part is driving back and forth to the parts store for fittings.

[central52]

When you connect to the wiper vacuum line, do you still get wiper action when it's turned on? And where do you get the "T" fittings for it, what size? Ed P.

[38plymouth]

The wipers work exactly like they did before. I think the fittings were 1/4 inch. I can find out for sure because I discovered last night that the plastic barb fitting I used softens a little from the heat. I need to change it out to a brass fitting. I'll try to post some pics. The parts I remember were a short nipple, a tee, a street elbow and the nipple. All should be 1/4 inch.

[Mr. Belvedere]

Where did you find the rubber grommit that fit the hole where the road draft tube went in?

[38plymouth]

I had the grommet from something else. I got lucky and it fit like it was made to be there. If I had to guess I would think it was from a sbc valve cover. I would bring the road draft tube to the parts store so they could match it up.