How to vent valve covers? 1jz

[kamikazemkiii]

Im wondering about venting my valve covers to the downpipe on my 1jz. Ive seen it done a few times, figured I'd as before hand tho just to get some suggestions. I would use a valve that only lets the vapors out, but not the exhaust gases in while retaining the intake pcv valve connected to the intake manifold. Any thoughts?

Thanks, Marcus

 

[hvyman]

Is this for a single? Wouldnt just routing it to the intake(pre turbo) be cheaper? The intake manifold usually does most of the work anyways.

 

[kamikazemkiii]

Yes, I dont mind spending a few extra dollars if need be. Previous setup sucked the vapors into the turbo/IC piping collecting oil every were. Some people would use a catch can but Id rather vent it out the exhaust If I could.

 

[87M-GTE]

It is smokey and stanky, but works excellently!
Theres alot of MKIV guys doing it this way, I would only do it on a non or very seldomly streeted car

Search MKIV section on sf


Im just routing mine like stock, vented pre-turbo with no catch can

 

[kamikazemkiii]

Would u happen to have a link? Does anyone know the name of the valve that only allows air/liquid out but not back in? Used on fuel systems

 

[oldsking]

Just do a catch can, combine the 2 valve covers to one, then into the can, then the can to the intake tube of your turbo, done

 

[Cz.]

Check Valve

 

[hvyman]

They sell them on summit. Iirc there like 35$ with the flanges and everything.

 

[mkiiichip]

The part you are looking for is an air injection check valve. Its just a part that was designed to flow the way you desire.
The problem is they are not designed to flow oil vapor (or liquid) so it may get coked up, and flow in an undesirable direction (they fail in stock form and usually only flow fresh air). Also smoke and bad smells will be normal (not to mention the additional deposits in the engine oil).

Do you plan on eliminating the PCV valve?

IMO this setup is good for only racing applications, in short bursts (ie drag racing). "POSITIVE crankcase ventilation" is needed in anything otherwise.

 

[suprahero]

Do you plan on eliminating the PCV valve?

IMO this setup is good for only racing applications, in short bursts (ie drag racing). "POSITIVE crankcase ventilation" is needed in anything otherwise.

Mine may be all messed up but here is how mine is. I deleted the check valve and installed a filter. I have a hose coming off of the passengers side valve cover going to a catch can and then a hose from the catch can to the intake tube feeding my turbo. I've been running it like this for about a year now with no ill effects..........that I know of.
I did away with the check valve because my car was smoking horribly. I removed the check valve, went down the road, no smoke. Put the check valve back in, I got smoke. I removed it permanently and put a small filter that you can get at Advance in the hole coming out of the driver side valve cover.

 

[mkiiichip]

Your post is hard to follow, but I gather its just an open crank case, with a filter?
Yeah american cars did that in the 50's and 60's, but they had a way to direct the fumes under the car, other than just venting in the engine compartment...

 

[Flateric]

PCV operation is important to the engine for oiling in what I have read along with fume and blowby removal. So a way of removing the fumes while not contaminating your intake and gumming up the valves is important. A catchcan or other means of doing this seems important to me.

I'm not sure how factual it is but I have even read a number of claims that having good strong vacuum has performance benefit and assists in ring seating and lubrication.

Having an open crankcase with no vacuum is not a good idea or how our motors were designed to operate even aside from the emissions reason for having a functional PCV setup.

 

[70dreams]

whats up bro. what you are looking for is a crank case evacuation system . they are sold at summit racing for about 40 bucks Part nmber is SUM 120108 . This is a very old system used my american muscle cars especially dodge to maintain negative pressure to seal up the motor. The kit comes with all the nessecary hardware minus the lines - thats up to you . all this and more info is on summit's website .