DIY Solution to M54-M52TU CCV problems

[Fifty150hs]

Originally Posted by Bmwe5320023.0

Thanks for sharing, you're probably one of the most senior guys with this mod.
I wish someone had measured the actual pressure.
Could I ask you to put your hand over the oil cap and say how strong is the suction?

I'd love to leave this mod now that I've done it. I really don't want to pull the manifold to reinstall another CCV assembly.
I wish I had just installed a brand new CCV when I pulled the manifold last time.
I was fooled by people running catch cans and cursing the ccv system, so I naively believed that it was evil and wanted to get rid of it.

The issue with the suction is that I'm afraid it will pull on the oil seal too hard and bust it.
I have already ordered ac delco top engine cleaner, so that will clean and unstick the rings.

Now it's interesting that I've rear quite a lot of threads on this mod, maybe all of them, and lots of people said that it stopped oil consumption, so I do trust that.

It's also interesting that no one complained of the damaged seals. So either people it happened to were to embarrassed to post about it or maybe, truly, miraculously, no one ever had an issue.

I'm thinking of buying a vacuum gauge and testing the pressure, maybe I can find someone who has measured it for comparison. I wonder what's the safe limit.

On another note, I heard some people saying that with this mod, you get too much pressure, and your gaskets gets blown out. Kinda interesting, how do you get excessive pressure when you're having vacuum. Maybe something I don't get.

Now my opinion on catch cans, not directed towards you, they're complete junk.
First of all, it's too simple of a system to separate oil and vapors.
Like, while the blow by gases pass through the can, probably a very small portion will stay in there. It's only by gravity that some oil droplets will actually stay in the can, everything else will continue traveling into the manifold. So I think the catch can is just useless.
Actually I think it's worse than that. Especially in the winter, because of condensation the stupid thing gets filled up with mostly water all the time. That's why I think the oil catch can is the biggest gimmick...

I have a vacuum gauge. Give me a couple of days and I'll test my engine. I have put my hand on the oil filler opening, both before and after. There is significantly more vacuum with the mod. As to catch cans you may be right, but in my experience it catches a lot of oil, but that's my system and my experience. The CCV is basically a catch can with a drain. It separates oil from the vapors and then runs it back to the crank case at the dip stick. I have to unscrew the can from time to time and pour the captured oil back into the engine. They both do essentially the same thing, but the CCV automatically returns the oil to the crank case.

[Bmwe5320023.0]

Thanks for the offer!
I think factory max is around 18 inHg
I'm thinking of using this gauge to measure
MEASUREMAN 2-1/2" dial, 1/4"NPT Lower, Glycerin Filled, Stainless Steel case, Brass Inside, 30inHg/-100kpa-0-30psi/200kpa https://a.co/d/aBk7onu

What's would be the easiest way to do it?
I'm thinking of just drilling a hole in the oil cap and then screwing that vacuum gauge unto it!

[Bmwe5320023.0]

Not sure if one or the other would be better for this measurement?

[80stech]

The guage that is vacuum only will give you a more resolution. You could hook it into the CCV drain line going into the dipstick or the dipstick tube itself. You will have full manifold vacuum in the crankcase less any leakage because the PCV "MOD" does nothing to regulate vacuum.

[Bmwe5320023.0]

That makes sense.
Do we know the full manifold vacuum?
I think 10 or 20 pages earlier in this thread, I read that with this mod, the vacuum is like 30 times stronger than what it's originally, so like close to 500 inHg.
In this case this gauge won't work as it only goes to 30 inHg.

[80stech]

Vacuum doesn't go higher than 30 in. so guage is ok. Read up on barometric pressure and how that translates to vacuum.

[Bmwe5320023.0]

If I understand correctly, the actual vacuum (negative pressure) in the system is the same, with factory CCV or without.
By factory, the CCV system simply blocked the manifold suction, so that the CCV Valve was controlling the flow basically, and not letting manifold intake pull at full force.
Without the CCV, intake manifold creates a lot stronger pressure because there's nothing stopping it.
So now the negative pressure must be trying to pull air into the engine from anywhere it can, like all the gaskets and seals. I guess they can't really leak, cuz the negative pressure is so high. How can oil leak outside if it's beong pulled inside? Yet at the same time, it must not be great for these gaskets and seals to be under so much pressure, they can probably get damaged by constantly being pulled inside the engine.
I'm not an expert and don't know for sure how it works.
By installing the PCV valve between valve cover and manifold, does it not restrict how much air the manifold can pull front the valve cover?
Or otherwise what's the point of that pcv valve?

[Fifty150hs]

Originally Posted by Bmwe5320023.0

Thanks for the offer!
I think factory max is around 18 inHg
I'm thinking of using this gauge to measure
MEASUREMAN 2-1/2" dial, 1/4"NPT Lower, Glycerin Filled, Stainless Steel case, Brass Inside, 30inHg/-100kpa-0-30psi/200kpa https://a.co/d/aBk7onu

What's would be the easiest way to do it?
I'm thinking of just drilling a hole in the oil cap and then screwing that vacuum gauge unto it!

I have a cap that I drilled a hole in to previously test. That is what I will use. The vacuum was really low, so low it barely moved the needle reading psi. I think I remember reading somewhere that the vacuum was somewhere around 11 inches water column by design. That is roughly 1/2 psi.

[Fifty150hs]

Originally Posted by Bmwe5320023.0

If I understand correctly, the actual vacuum (negative pressure) in the system is the same, with factory CCV or without.
By factory, the CCV system simply blocked the manifold suction, so that the CCV Valve was controlling the flow basically, and not letting manifold intake pull at full force.
Without the CCV, intake manifold creates a lot stronger pressure because there's nothing stopping it.
So now the negative pressure must be trying to pull air into the engine from anywhere it can, like all the gaskets and seals. I guess they can't really leak, cuz the negative pressure is so high. How can oil leak outside if it's beong pulled inside? Yet at the same time, it must not be great for these gaskets and seals to be under so much pressure, they can probably get damaged by constantly being pulled inside the engine.
I'm not an expert and don't know for sure how it works.
By installing the PCV valve between valve cover and manifold, does it not restrict how much air the manifold can pull front the valve cover?
Or otherwise what's the point of that pcv valve?

The PCV valve does restrict some air, just not as much as the CCV.

[80stech]

A PCV valve is not designed to work in a closed system so it will open completely as soon as crankcase vacuum over comes manifold vacuum minus the PCV valve spring pressure. The only restriction is up until that point right after the engine is started or there is enough blowby (or leak) from the rings to close it again.