Question...on oil in the plenum

[Qualitywires.com]

I am looking at a Blue GTS right now and I am just doing some small things to it. I was looking in the plenum and noticed that one side of the intake plenum was dry and the other side had some oil in it. Not alot, but enough where you could get your finger wet. Spark plugs look good, no oil soaked plugs...any idea what would cause this?

If it was braking wouldn't both sides have oil in it?

Thanks.

 

[99 R/T 10]

No, beacuse when the oil dumps into the intake it only goes into one side(passenger side has the oil, correct?). It's not just the braking, but also the acceleration. It dumps, then *****, and it ***** hard too

 

[Qualitywires.com]

explain more please... Does this just apply to Vipers or do other cars do this too?

If it was blow by wouldn't both sides have it?

Also on this TNT viper I am doing some stuff to...it had a lot of oil in it too. This engine was just rebuilt....not sure if it was ever cleaned up...
but anyways...this is not the Blue Viper I have now.

 

[Vic]

On my Gen2, the valve covers both have a breather hole towards the front of each cover. There are hoses attached to these ports, and there's a Y fitting between the two hoses, that joins both together. Then one hose only, the product of both left and right covers, exhales into the drivers side of the air cleaner housing, ahead of the throttle bodies. This would tend to let oily residue mostly enter the left side of the intake plenum.

 

[99 R/T 10]

I agree the oil goes into the left side, but that feeds the pass. side bank of cylinders, so the oil residue ends up on the right side of the engine.

 

[SilverSnake]

Could be the intake gasket on the valley side didn't seal properly and is pulling oil from there.

 

[FE 065]

Correct me if I'm wrong, but I believe the system is designed with the idea of the driver's side air cleaner hose being an inlet to the PCV system. Not an outlet.

Crankcase air is sucked into the intake manifold behind the throttle bodies as it is picked up by the airstream passing from the air cleaner, thru the valve covers, down into the crankcase via the oil drain back passageways in the heads, and then up into the intake manifold behind TBs via the lifter valley hose that T's into the vacuum ports behind the TBs.

Without that air cleaner inlet, the vacuum from the TBs would be sucking against a vacuum and not accompishing any flow through crankcase evacuation.

Of course there are cases of oil finding its' way into the air box via the single hose you speak of..

 

[RoadiJeff]

An oil catchcan should take care of any issues with oil in the intake. The one below was made by PBJ and powdercoated to match the airbox he also made. He recommends draining it at each oil change. There is a little site glass to check the oil level and a drain valve on the bottom.

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