He is also running E85 like the rest of us around here. So that should be very clean even if there was oil?

 

You need Kracka Vents!

http://www.maperformance.com/store/p...cat=695&page=1

And a catch can

 

This seems like it is more than just a blow-by issue. I could be wrong though. He wants to pull the head, but I told him we need to find the source of the problem first. Any more ideas? Thanks.

 

I would look at the turbo and see if its blowing oil. Check the FMIC as well for oil.

 

He said the Ic pipes car clean. So its not the turbo, not the pcv cause he's venting to atmo. I would look into valve guides.

 

Having that in the intake and exhaust ports is very odd. Do you have MIVEC or adjustable cam gears? If so how are each set up. If there is NO oil in the i/c pipes then it is probably not coming out of the turbo. The oil/black mess in the intake side of the head would only get there from reversion then and what I am seeing here is not normal at all.

Did you do a compression or leak down check? Does the car smoke?

 

that's pretty nasty.....i think im gonna check mine now

 

OK, he has an 04 evo 8 so no mivec and cam gears are stock w/ everything in time (checked it today). I don't know if it's in the exhaust ports or not. We will find out tomorrow. Oil is definitely not in the intercooler pipes anywhere we removed them all. Compression test has not been done, the car does not smoke at all. What is reversion? I appreciate your input.

 

Man, it's worse than I thought. We pulled off the valve cover and also pulled out the spark plugs. The new pistons are caked in this stuff too. It looks like it's been cooked on there. I know were going to have to pull the head now to get this cleaned up. I just hope it will come off with some brake cleaner. What the hell is causing all of this? I feel so bad for this guy.

 

I could be wrong but isn't reversion the process whereas gases from inside the motor, contaminated with oil and gas, gradually works its way out of the motor over time and onto the intake manifold and /or valves?

My 350Z plenum had a similar build up, but nothing near as bad. It was definately a coating that had the physical characteristics of oil, yet smelled of gas.

John

 

This whole ordeal has been so puzzling to me. A quick google pulled this up...

Reversion, what is it? It is simply the exhaust pulse flowing backwards momentarily during the overlap phase of the camshaft at low cycling rates. During the overlap phase the piston is pushing out the last of the exhaust gases and prior to reaching top dead center (T.D.C) the intake valve and the exhaust valve is still closing. At this point in the engine cycle both valves are in the open position. At high cycling rates the inertia of the incoming intake charge and the outgoing exhaust pulses keep the exhaust flowing in the proper direction. But at low cycling rates, as the piston is pushing out the last of the exhaust gases the intake valve opens and some of the spent exhaust charge is pushed into the intake manifold. As the piston reaches T.D.C. and begins the intake stroke the exhaust valve is still not completely closed. As a result, the piston pulls from the intake and exhaust valves simultaneously causing the exhaust gases to flow in a reverse direction. This is normally not a problem until you add water into the exhaust stream. Reversion can be severe enough to stall the engine, add water to the oil, rust the exhaust seats, etc. This effect only happens at idle speeds, but remember that during shut down the engine encounters the greatest reversion.

 

Should have done a leak down check.

 

I can still do this with his valve cover off can't I?

 

I'd recommend a compression check/leak down check before you take it apart further.

 

.. the pubic hair come from?