EHM and blow by

npkdm · **Joined:** Wed Sep 03, 2014 8:28 pm **Posts:** 163

A few weeks ago it dipped into the 20's here. I started the crd and drove off without warming it up. A few miles down the road I smelt an oily odor. Next day I checked the oil an noticed my EHM was black with oil. It's a clear hose and usually looks opaque brown. It seems like I pushed liquid oil through the hose. Is this common? Was my oil over full to begin with?

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thermorex · **Posted:** Tue Nov 25, 2014 10:08 am

It could be. But I would advise against using ehm on cold weather, condensation may form from the warm oil steam in the hose and freeze, causing your (usually) rear main to blow.

WWDiesel · **Posted:** Tue Nov 25, 2014 10:47 am

EHM is not the best option for your motor; read this thread and be enlightened.
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=80491
CCV needs some negative pressure to function correctly....
:mrgreen:

flman · **Posted:** Wed Nov 26, 2014 9:18 am

And another guy that read the noob guide. :roll:

viewtopic.php?f=5&t=74236

thermorex · **Posted:** Wed Nov 26, 2014 9:49 am

Some stuff in there is good though, but in the sense of fairness, it's plenty obsolete information also, from way pre gde tune era.

flman wrote:

And another guy that read the noob guide. :roll:

viewtopic.php?f=5&t=74236

WWDiesel · **Posted:** Wed Nov 26, 2014 12:45 pm

flman wrote:

And another guy that read the noob guide. :roll:

viewtopic.php?f=5&t=74236

An EHM mod that went really, really BAD! :grim:

Another example of why not to do the EH mod

After all the great discussion by everyone, I do believe that a ProVent or Racor filter is the very best option; NOT an EHM!!! :mrgreen:

thermorex · **Posted:** Wed Nov 26, 2014 2:07 pm

WWDiesel wrote:

flman wrote:

And another guy that read the noob guide. :roll:

viewtopic.php?f=5&t=74236

An EHM mod that went really, really BAD! :grim:

Another example of why not to do the EH mod

After all the great discussion by everyone, I do believe that a ProVent or Racor filter is the very best option; NOT an EHM!!! :mrgreen:

Quite honestly, if I would have had gde tune (or weeks elbow) prior to provent, I wouldn't have installed it. That little oil that goes through intake can't be that bad, unless you overfill the engine oil.

flman · **Posted:** Wed Nov 26, 2014 2:19 pm

That little bit of oil actually dissolved any soot built up in my stock elbow.

WWDiesel · **Posted:** Wed Nov 26, 2014 2:34 pm

thermorex wrote:

Quite honestly, if I would have had gde tune (or weeks elbow) prior to provent, I wouldn't have installed it. That little oil that goes through intake can't be that bad, unless you overfill the engine oil.

My only concern with not having a ProVent or Racor filter is the accumulation of oil in the CAC (intercooler) over time. I know for a fact that when I did my timing belt job and pulled the CAC, it had a lot of oily buildup in it that I had to wash, soak overnight , and then use some chemicals to get it all cleaned out good... Some Oil will always settle in the lowest part of the CAC even though air is being forced through it by the turbo.... :2cents:

No CCV filter or EHM, oil in the boost hoses and CAC, make your own choices! :wink:

greiswig · **Posted:** Wed Nov 26, 2014 2:36 pm

flman wrote:

That little bit of oil actually dissolved any soot built up in my stock elbow.

I'm kinda surprised that most of the oil doesn't just settle to the bottom of the CAC, and never make it to the intake.

(Edit)Ah...WWDiesel beat me to it.

(Edit #2) flman, how do you know it was actually that which dissolved the soot buildup in your stock elbow? And which elbow are you talking about? If it's the one right before the turbo suction side, I could definitely see it.

flman · **Posted:** Wed Nov 26, 2014 3:06 pm

greiswig wrote:

flman wrote:

That little bit of oil actually dissolved any soot built up in my stock elbow.

I'm kinda surprised that most of the oil doesn't just settle to the bottom of the CAC, and never make it to the intake.

(Edit)Ah...WWDiesel beat me to it.

(Edit #2) flman, how do you know it was actually that which dissolved the soot buildup in your stock elbow? And which elbow are you talking about? If it's the one right before the turbo suction side, I could definitely see it.

With 20 PSI, the oil is not going to set in the bottom of the CAC.

The elbow that the weeks kit replaces looked very clean, intake still had some light sooting left on it.

On another note, I just ordered ARP studs for the other Liberty, since it is not that easy to pull the exhaust manifold and head while you are in there and put it all back together.

DOC4444 · **Posted:** Wed Nov 26, 2014 9:24 pm

A properly installed EHM that has no dips and terminates below the driver's seat will not collect enough water to freeze and block the hose. Have run one since 17K miles when I found the rear main seal had blown. Installed EHM, replaced seal, no leaks at 147K miles in New England.

Until someone convinces me how to ensure that the CCV will not malfunction, I will stick with it. (I always pull a vacuum in my Formula Ford Kent motors by using two stage dry sump scavenge pumps, but that is for horsepower and ring life.)

DOC

WWDiesel · **Posted:** Wed Nov 26, 2014 10:16 pm

flman wrote:

With 20 PSI, the oil is not going to set in the bottom of the CAC.

Pressure is not consistent! It is all about the amount of air flow through the CAC and the flow is never constant through the CAC as turbo boost varies depending on engine loading. Low boost levels, ie low pressure, will not provide high enough consistent velocity to keep the oil in a pure vapor state and entrained in low air flow conditions to prevent it from condensing and falling out of the air flow and collecting in the bottom of the CAC...
I personally have seen the evidence of oil accumulation in the CAC, so I know for a fact that oil will and can accumulate in a CAC...
I will agree that oil is a good cleaner, if you can keep it entrained in the air flow at all times, which we know is not possible in our CRD diesel case... :wink:

rancherman · **Posted:** Wed Nov 26, 2014 11:12 pm

Just installed the elbow kit this afternoon, plus the samcos, plus the FT eco tune.
See no reason to not continue my oem ccv. That was the main reason for the silicone hoses right??? If you are blowing that much oil out the ccv, and the oil level isn't too high, there's more important things afoot than worrying about an ehm, provent, or whatever the fad of today is.
The build up in my now 75k mile crd's elbow was surprisingly low. Sure, it was black, and maybe, MAYBE 1/4 inch thick on the one radius of the elbow. The opposite radius was far less. And, it was a DRY build up downstream of the egr injection site. Nowhere near typical of the pics I've seen in 'here'.
How my jeep is being driven may have a reason for this. I'm either lucky, or unlucky to live 30 miles from the nearest town. Lets just say 'short hops' are not really a problem.
The oil that is 'in' the blowby is very similar to steam, it is vapor. Until it hits a cooler surface.. aka 'intercooler' it tends to stay in aerosol state. A certain amount will condense in the cooler tubes, and gravity does the rest. I'd think wintertime would be the worst.

flman · **Posted:** Thu Nov 27, 2014 7:11 am

WWDiesel wrote:

flman wrote:

With 20 PSI, the oil is not going to set in the bottom of the CAC.

Pressure is not consistent! It is all about the amount of air flow through the CAC and the flow is never constant through the CAC as turbo boost varies depending on engine loading. Low boost levels, ie low pressure, will not provide high enough consistent velocity to keep the oil in a pure vapor state and entrained in low air flow conditions to prevent it from condensing and falling out of the air flow and collecting in the bottom of the CAC...
I personally have seen the evidence of oil accumulation in the CAC, so I know for a fact that oil will and can accumulate in a CAC...
I will agree that oil is a good cleaner, if you can keep it entrained in the air flow at all times, which we know is not possible in our CRD diesel case... :wink:

People have taken them off and were only able to get a spoon full of oil out of the CAC. I wont loose a wink of sleep over it. :JEEPIN:

EHM and blow by

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