pvc oil separator

[New2Import]

Anyone used one on the M. I havent even looked at the engine yet but make plans on some little minor mods to do like TB bypass and so once I do. These help on engine longevity and fuel mileage
Modified by New2Import at 3:04 AM 2/20/2009

[fiveliterbeater]

hey i had the same problem with both of my LS1's; is this problem also on the VK motors as well?

[szh]

Anyone used one on the M. I havent even looked at the engine yet but make plans on some little minor mods to do like TB bypass and so once I do. These help on engine longevity and fuel mileage.

I'll ask the dumb question, since I do not know ... what is a PVC Oil Separator?

Z

[New2Import]

hey i had the same problem with both of my LS1's; is this problem also on the VK motors as well?

Thats a must for the LS1 and pretty much any GM. You need to get one installed like yesterday if you havent.

szhosain this will separate the oil thats gets sucked in the PVC system on WOT and hard runs. If the separator is not used the oil goes back to the intake which it thens coats the top of the pistons causing detonation and kills your engine over time. Maybe thats my Im reading alot of Ms has oil comsumption. Its got to go somewhere. And My heading should be PCV and thats Positive Crankcase Ventilation. Here are pics of the separator.Jegs

Homemade with parts from Lowes

Parts

[NightWatch]

I'm aware of the issue with GM's LS1 drawing oil in through the PCV valve under certain high engine load circumstances, but I'm not aware that either the Nissan V6 or the V8 has the same flaw so what would the purpose of this mod be?

[szh]

Oh, dummy me.

I was tired from a long day at work and misread the typo in the title. The original post meant PCV ... not PVC (I read it as Poly Vinyl Chloride or plastic). Sorry about that!

"Never Mind!" - Gilda Radner

Z

[ken in az]

short answer - it couldn't hurt as long as you were dilligent with the install to make sure it doesn't leak or draw air.

I've had my intake off a few times and I haven't noticed any problems - knocks on wood

[New2Import]

I'm aware of the issue with GM's LS1 drawing oil in through the PCV valve under certain high engine load circumstances, but I'm not aware that either the Nissan V6 or the V8 has the same flaw so what would the purpose of this mod be?

Well thats the thing. You dont know unless you pull the PCV valve and look at the system to see if its pulling oil up and that all depends on the pressure. Not all engines do it. High compression engines will. I dont know anything about these engines just yet. What is the compression on the Ms? Ive read threads of oil comsumption and its either blow by or the PCV system pulling the oil. The oil has to go some where. LT1s and LT4s also pulled oil. They are high compression engines 10.5 to 1 on stock motor. I have a 12.5 to 1 383 LT1 with only 1500 miles on it and I lose alot on hard runs. I havent tested my M for oil comsumption.

[szh]

Compression ratio is 10.5 on the VK45 and 10.3 on the VK35.

I suspect that the oil use in the VK engines is due to blow-by. Looser piston tolerances compared to the earlier Q45 V-8 engines to get the additional horsepower.

But, this is conjecture, not knowledge.

Z

[New2Import]

Well with that much compression its something to look at because I assume that the crankcase has alot of pressure. Im gonna look at dipstick and do a few hard runs and WOT for a week. If oil level drops thats the problem. If the factory used loose tolerances they wouldve recommended a thicker oil. Thats just common sense.

[szh]

Well with that much compression its something to look at because I assume that the crankcase has alot of pressure. Im gonna look at dipstick and do a few hard runs and WOT for a week. If oil level drops thats the problem. If the factory used loose tolerances they wouldve recommended a thicker oil. Thats just common sense.

Yes, please do post on your findings. It would be good to know what is up!

By the way, I seem to remember a post (by Q45tech) that Nissan had also reduced the ring tension (presumably to reduce the cylinder wall friction). If so, that would also lend credence to the blow-by theory.

However, it would be good to see what you find out.

Z

[New2Import]

I think Im gonna go ahead and install one next week. Ive been doing alot more reading and BMW uses these on their high compression engines and Ive read of some Nissan owners have as well. Thats where oil comsuption starts because of the high pressure in the crankcase and that even created blowby. This will atleast keep the oil out of the intake. By doing that will not have to seafoam anymore. Ive done this on all my cars and trucks with high compression so why stop now. If you have to burn high octane then I see a use for this. You should even see mileage increase a couple of gallons. Ill post install pics when weather gets better to work on car.