I'm running a pan evac on this LT1 since the pcv has proven inadequate at higher RPM's.

This isn't a 'should I' thread. I've wanted to give it a whirl for a minute now, and the car is setup to work fine with it. If it ends in a failure it's easily removed since the tubes are installed in 45 degree O2 bungs and easily capped. That being said...

I like the somewhat stock look and am not a big fan of the openly aftermarket look. I'm using OEM style black centerbolt covers and am wondering if anyone has tried my idea.

I'm thinking I will cap off my PCV port on the intake. I want to use a set of modified OEM covers and flip them around to put the PCV/breather ports in the front, and use OEM breather lines (that would normally go to the TB) to connect to the pan evac for a clean look without the big push in breathers. They would also fit nice around my coil packs, also mounted on the covers. I'm hoping moving them to the front would eliminate the chance of oil running into them during hard acceleration, and the baffling on the inside of the covers would provide a cleaner look vs the big round external breather that doesn't fit my covers anyway.

I'll be using a vac gauge to monitor the system, and can always use the factory pcv valve location with a filter and regulator to adjust the vacuum if needed by allowing in a small amount of filtered air) and hide it away ( like between the filter and maf)

Just some ideas. Curious if anyone has tried something like this.

 

..... You like the stock look but you have coil packs on the valve covers ??? ... no need for the vacuum gauge , header pan evac systems don't pull that hard .....

 

I need to verify your "pan evacuation" is using the exhaust header evacuation tube to create the vacuum correct?

Theres a nice U-tube video that shows an example of this and the owner gets some 4"Hg vacuum. I wouldn't expect much more than that. I think you are doing this correctly use a gauge to monitor actual crankcase vacuum. And it would be helpful to see what you have now with the stock PCV as is for comparison. If you can't find the U-tube video let me know.

Yes I don't like the stock PCV system as it is more of a controlled leak that contaminates the fuel/air charge lowering the octane of the fuel. But the alternatives are just running breathers or expensive vacuum pumps for crankcase ventilation. But again it would be interesting to see what the actual stock results are for comparison. Crankcase vacuum gauge is on my to do list for my camaro. I have a manifold vacuum gauge right now and love it for daily driving.

 

OMG - OK - you all are so totally INSANE @!!! What does the PCV system have to do with the CrankCase Vent system >>> OMG greg

 

Is this for driver or a racer?

 

Regardless, labeling someone as totally INSANE is a personal attack and against forum rules.

 

It looks like it could have been done from the factory. I don't like wild changes cosmetically. So nothing shiny, no wild colors, etc.

Yes, I'm perfectly aware there weren't coil packs on the valve covers.

Yes we are talking crankcase evacuation into the exhaust. I have the stock setup with the u-hose that goes right back into the intake. I'd take some pics but I'm out tinkering with it right now.

 

..... FYI ... PCV = Positive CRANKCASE Ventilation ! .....

 

Apologize for the insult to all BUT the PCV system has nothing to do with crankcase ventilation.

You are mixing two distict systems: The PCV system is designed to keep the crancase clean under light load. Under heavy loads (i.e., WOT) it does nothing - nothing - nothing ! In fact it can be removed althought I prefer not.

Crankcase venting is required because all engines, particularly under heavy loads (i.e., WOT) develop positive pressure from blow-by. Any crankcase pressure robs you of some power because the piston bottoms have to deal with it. Nornally a vent atop each valve cover is more than adequate.

Many people have experimented with electric evacuation pump(s) (re-purposed smog pumps) and/or exhaust systems with checkvalves to help.

All I ask is for ye all to understand the difference and not equate the two - OK !!!! greg