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914World.com _ 914World Garage _ Head Vent

Posted by: tim_nd Mar 18 2012, 11:03 PM

I have searched the database about this matter, but all threads tend to point towards carb related cars only.

I have a 74 1.8L that I'm putting back together, with the original Ljet FI system. There are 2 head vents nipples, but I have no idea where to run these to? Does anyone have a picture of a stock setup?
I'm also confused, my other 914, a 75 1.8L doesn't have such things. From what I can tell, it looks like the exact same engine, except these silly nipples next to the manifolds. I'm using alot of my 1975 parts to piece together my newer 74, and I'm just missing pieces related to this vent setup.

Sorry again for bringing up this subject. Thanks for any advice

Posted by: reharvey Mar 19 2012, 03:03 AM

The later cars didn't have the vents in the heads. The hoses go to a three nipple valve thats screws to the blower housing toward the left. I'm sure there is a diagram showing this but I don't have it.

Posted by: type47 Mar 19 2012, 05:59 AM

look at post #2 of this thread:

http://www.914world.com/bbs2/index.php?showtopic=175278

The diagram in the 2nd post shows the routing of the head vent hoses. They are connected to an "anti flash-back" valve then connected to the air cleaner housing.

Posted by: tim_nd Mar 19 2012, 07:49 AM

Helpful, but that picture diagram isn't a Ljet system. Surely someone on this forum has a picture of their stock Ljet setup? I'm a visual person, it would make much more sense to me seeing this all laid out, the way the factory intended it to be.

Posted by: SLITS Mar 19 2012, 07:53 AM

As stated, the L-Jet did not use head vents. Plug them for L-Jet use.

Someone switched heads or drilled them for vents.

Posted by: ClayPerrine Mar 19 2012, 08:05 AM

I can't believe I am going to do this.......

with Slits (GASP!!)

The L-Jet system uses a closed crankcase ventilation. The intake tube hooks to the oil filler, so any blow by gets picked up by the intake. The head vents were never drilled on a 1.8L. So just put metal plugs in them and be done with it.

Posted by: tim_nd Mar 19 2012, 08:21 AM

Thank you, thank you. Something didn't seem right. I will plug the hell out of them!