case and head vents, do I need to run a breather box? Options

[wayne1234]

Ok dual webber carbed 2.0, I think the PO had the head vents running to a T then to the oil breather near the oil cap... Is this right?? I did a search and now I'm really confused,,,,

[r_towle]

Cevan,

If you run the oil vapors into the carbs, its much cleaner in the engine bay, period. I will say the net result for me and my personal issue is that I have less oil in the engine bay now...but I found a leaking head vent tube while installing the system...

With the exit gases routed to the carbs, I have this opinion.
The drawback that IC is that now you are once again introducing oil into the A/F mixture which makes the burn less efficient. Spark plugs dont like oil, and IMHO you loose HP.

If you use the original setup Foley makes yet run a hose from the top vent and relocate the exit of that vent somewhere outside of the engine bay, you will get the best of both worlds...

Do not vent it in front of a wheel...oil vapor on one wheel would be bad.

Older american cars just ran a hose with no filter down underneath the car and used the venturi affect to suck the vapors out of the hose.

From personal experience, I just installed the EMPI/CB performance unit and I mounted it right in front of the motor, centered like Foley shows his.
Well, guess what is right next to it. The electrical intake heater fan...
This setup now sucks crankcase vapors (which are not just oil but blowby gases) into the passenger compartment...
I was good for one trip to work and back...now I need to change the output. Headache, CO levels to high and I drove to work and back with the windows open in the winter...not a good setup.

The EMPI/CB performance unit has a raised lid that allows the gases to escape all around the lid. I plan to mill off the raised standoffs and close the lid tight, then add a NPT pipe fitting to the top and remote locate a filter outside the engine bay....somewhere...dunno where.

I wont shoot the vapors into the carbs, I need every spec of HP the little powerplant can produce and IC no logic in adding oil to the mix. My car will never be a green planet saver, nor will it single handedly deplete the ozone layer.

I have all my DD cars running modern FI with all the restrictions. the 914 is a toy and is driven as a hobby car.

Rich