I just installed my MotorDyne ISO and didn't find
any oil but saw what appears to be discoloration
on two of the runners. Would Stillens catch can
be the answer for this problem? According to Stillen
their catch can will solve the problem of oil residue
finding it's way into the intake runners.

 

I don't know HOW I missed this thread! Dennis, that is so completely obvious that it is scary. LOL! I am interested to see what you guys have come up with on that. I am sure it isn't like pouring oil into the intake (or more people would be complaining of knock/pinging) but like getting a bad tank of gas it is going to have an effect.

To the person who said if this were a problem we would get pinging - not necessarily true. This wouldn't be enough to cause MAJOR pinging and our engines have the knock sensor to "adjust" the engine for small problems. Basically this at the very least is likely to affect the readings on said sensor (by causing minor knock) and cause the engine to change up the timing, etc to compensate. Yes, we can run like this for the life of the engine and likely not notice but as with so many mods it is another *improvement* in the efficency of the engine - assuming this fix does the job.

 

any updates on this?

 

Alright....now I'm confused....

Everything I have read up to this point about the VQ's intake vent system says that there is a oneway valve on the passengers side hose and that you get NO oil in the intake from that side.

Everything I read said it is the hose on the drivers side that contributes to the oil in the intake....

I just installed a catch can, and there was NO oil in either line....clean as a whistle.

 

what ever happend PASTA???

 

This little mod is a step going forward, The bigger picture is what? The work THAT" is being done on, and my way of thinking is, Why put a catch can on when there is absolutely a better whey to manage PVC and make more HP at the same time. My busy life style running a company has slowed things down a bit, But. I know there will be some great new mods PRODUCED" that will make HP. Time will tell. Pasta

 

Seems like you are using brands and qualities of oil that have too much evaporation [heavy vs light fraction] index.

Conventional oil base stock is horrible, semi synthetic [hydrogenized] is better, and synthetic is best.

The best oils lose 5% of volume in 2,000 miles, the worst about 20%......almost all of this must go thru PCV system.
NOACK VOLATILITY TEST ASM D-5800

http://www.savantgroup.com/papers/noack.sht
http://forms.gradsch.psu.edu/equity/...nonRaymond.pdf
http://www.osd.org.tr/17.pdf

"In 1996, volatility limits tightened to 22% with GF-2 oils’ entrance on the market, then were again lowered in 2001 – this time for all grades – to 15% (or 13% for European synthetic motor oils) with GF-3 oils’ introduction."

 

Well I did the MD spacer with 4500 miles on my car, and there WAS oil in the plenum. So I am interested in a catch can.....

As stated above, this is not a new thing and definately not specific to Nissan. I have done catch cans on several other brands of cars, and that filter WILL catch oil.

 

The oil vapor condenses on the first cold [cooler than 200F] object. Obviously any device that " catches the oil vapor" without restricting the air flow doesn't do any damage to the emission calibration.

 

I'm totally with on this and I feel the same way. I've seen quite a few high mileage (200-300K) VQ30 teardowns and these motors have the same PCV setup. The intake manifolds are pretty filthy, but internally, the engines are spotless. Same goes for the dynos on many hard driven high mileage VQs. They just don't seem to loose power as they age past 100K miles. On teardown, the bores still have the hone marks,valves are clean, rings are tight, etc. It's my opinion (read: opinion) that Nissan has gone to great lengths to make the VQ series motors very reliable and strong. I have a hard time believing that they would overlook something that could/would cause poor engine performance and potentially damage the engine. When these motors are under R&D, they are driven for hundreds of thousands of miles then are thrown down. I would think if Nissan engineers thought this residual oil was a problem, they would have remedied it.

I guess stranger things have happened even with some of the ebest engineers. It use to be that later model Toyota V6s were infamous for sludging up and self-destroying. Toyota had numerous warranty claims with those motors and it appears that the design flaw did escape R&D.

 

Does anyone know the ID of the hose that the catch can would go into?

 

bump for more details on this mod

 

Agreed^^

 

Well, this thread's dying a natural death. I'm planning on doing my version of a catch can this weekend and I'll post in a new thead...

 

what filter should I buy? Or should I just buy the stillen or greddy oil catch can. Do these catch cans go where the filter Pasta installed is? I also noticed some oil in the plenum when I installed the MREV.