Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Proper PCV arrangment for a 2L, A little help please
North Coast Jim
post Aug 26 2026, 08:27 AM
Post #1


Member
**

Group: Members
Posts: 349
Joined: 11-December 15
From: Northern Ohio
Member No.: 19,450
Region Association: MidAtlantic Region



Have a newly rebuilt 2L in the car with 40 IDF Weber carbs which is running fine except for a RMS dripping oil. We believe we installed it correctly and took careful steps assembling the rest of the engine/flywheel/clutch/transmission. We believe that the crankcase vent system is not working properly which is pressurizing the crankcase as RPM builds, thereby pushing oil out the RMS.

My oil fill assy has a 022115542 PCV assy in it and a solid oil fill cap. I took the valve out to see if it was working. When I blow into the bottom it is initially open. Increased pressure it closes the valve. Seems backward to me. My oil fill tower has no vent in it.

I do know that when I got this motor, 6 years ago, the PCV assy was in pieces all captured in the oil fill assy. I took it out and reassembled it thinking it was correct. Maybe not ??

I have Len Hoffman heads when he sold them direct and the vents are capped shut per his instructions.

Any help is appreciated.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
Ninja
post Aug 29 2026, 10:24 AM
Post #2


Member
**

Group: Members
Posts: 323
Joined: 25-September 25
From: Granbury Texas
Member No.: 29,004
Region Association: Southwest Region



(IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif)

And then...

A vacuum vented PCV system REALLY needs a plenum where all 4 cylinders are connected as ITB set ups usually have poor low speed vacuum.

It's the same reason a MAP sensor does not have the resolution to function properly below 2k RPM on an ITB set up.

Now, the HATED progressive 2bbl WOULD allow a vacuum PCV but...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 22nd October 2026 - 08:32 PM
...