2.8L CRD Blow-By

Rixram · **Posted:** Wed Jun 30, 2010 11:26 am

Hey, our CRDs ahave a crap-ton of blow-by.

I'm assuming this is the case from our wildly pressurized crankcases and the filthy oil we pull from these suckers.

Anyone know of any treatments to reduce blow-by (and thus increase power and efficiency while reducing wear) without posing any risk to the turbo longevity?

grywlfbg · **Posted:** Wed Jun 30, 2010 6:45 pm

Search for the Elephant Hose Mod (EHM).

Tinman · **Joined:** Mon Apr 10, 2006 10:45 am **Posts:** 308

How effective is the Provent mod.? How hard is it to install? Wife is complaining some about the "smoke" from the EHM.

Joe Romas · **Posted:** Wed Jun 30, 2010 7:17 pm

Tinman wrote:

How effective is the Provent mod.? How hard is it to install? Wife is complaining some about the "smoke" from the EHM.

Very effective but you'll need to be creative installing it under the hood of the liberty.

Mine recently went to the dealer for some warranty work so I removed it. The hose from the provent back into the turbo intake was dry :-)r

Collingwood · **Joined:** Sat May 01, 2010 9:53 am **Posts:** 24

From my experience with TDI's and other diesels this is because of the high compression ratio of a diesel engine. All my VW diesels have tons of blow-by. When you are dealing with 18-22 compression ratio which is at least twice that of a gas engine you are going to get twice the blow-by. There is nothing wrong with this much blow-by, it is just the nature of the diesel engine. It sure makes the for a need of a much improved CCV, or just exhaust it out on the ground like all the older big truck million diesels do.

VMKJCRD · **Posted:** Wed Jun 30, 2010 7:42 pm

Some people here have ProVents, homemade catch cans, and EHMs. I just ran a hose all the way to the end of the exhaust. I put a 90 at the end of my hose pointing at the exhaust and the smoke gets blown away by the exhaust. I still see some smoke but its a lot better now and what ever smoke you see looks like its coming from the exhaust.

naturist · **Posted:** Wed Jun 30, 2010 9:41 pm

I have a Provent, and while it took a little plumbing ingenuity, it fits. And solves the oil-in-the-intake problem.

I also have a problem with what is called the EHM.

Besides being illegal, do you not understand that the single modification consisting of routing the blow-by back into the intake removed about 80% of the pollution pre-1967 vehicles made, and that by performing an EHM, you turn your vehicle into a pollution machine?

Please, please, please, do it right: put on a Provent or some similar system. Don't just dump your fumes into my air.

Rixram · **Posted:** Wed Jun 30, 2010 10:23 pm

naturist wrote:

I have a Provent, and while it took a little plumbing ingenuity, it fits. And solves the oil-in-the-intake problem.

I also have a problem with what is called the EHM.

Besides being illegal, do you not understand that the single modification consisting of routing the blow-by back into the intake removed about 80% of the pollution pre-1967 vehicles made, and that by performing an EHM, you turn your vehicle into a pollution machine?

Please, please, please, do it right: put on a Provent or some similar system. Don't just dump your fumes into my air.

Or, you could just re-plumb it to go into your airbox, and add a wrap around it to catch the oil. The fumes are pulled into the engine still, but the crap is filtered out. On shutdown, you smell it a little, and when idleing, but that aside, it is preventing the crap build-up on the intake side of the engine and the oil ingestion. I just have to change my airfilter at oil changes.

mackruss · **Posted:** Thu Jul 01, 2010 3:44 am

Would you mind elaborating a bit on what you have done with your EHM by routing the gasses into the airbox.

Surely the oily vapours will clog your air filter in no time although you say you wrap something around, confused but interested as i'm just
running a hose out the back at the moment but i don't like it as it is.

I think you may also run the risk of clogging up your MAF sensor if you do what you've done.

Joe Romas · **Posted:** Thu Jul 01, 2010 6:40 am

[quote="naturist"]I also have a problem with what is called the EHM.
Besides being illegal, do you not understand that the single modification consisting of routing the blow-by back into the intake removed about 80% of the pollution pre-1967 vehicles made, and that by performing an EHM, you turn your vehicle into a pollution machine?[quote]

I agree. PCV first was required in 1961 in California. This article explanes what "open" vs "closed" systems are :jester:

http://www.aa1car.com/library/pcv.htm
Also other then injecting oil sludge into the intake this first mandated polution control device didn't cut preformance like the many devices that followed :shock:

Rixram · **Posted:** Thu Jul 01, 2010 8:11 am

mackruss wrote:

Would you mind elaborating a bit on what you have done with your EHM by routing the gasses into the airbox.

Surely the oily vapours will clog your air filter in no time although you say you wrap something around, confused but interested as i'm just
running a hose out the back at the moment but i don't like it as it is.

I think you may also run the risk of clogging up your MAF sensor if you do what you've done.

I had photos, but ended up deleting them.

But, basically, I took the EHM and ran it into the airbox. I used a proper fitting on the side of the airbox. Inside the airbox, I zip-tied a marine piece that is commonly refered to as a "Bilge-Diaper", made of virgin cotton around the fitting. The bilge diaper catches the oil in suspension. I secured additional bilge diaper material to the bottom of the airbox to catch any oil drippings. The remainder of the gases are then pulled, sans oil, into the intake side of the filter. Nice clean air for my CRD, without any of the nastiness that was building up. I check the filter monthly, and so far, it is doing well.

nursecosmo · **Posted:** Thu Jul 01, 2010 9:52 am

Rixram wrote:

I had photos, but ended up deleting them.

But, basically, I took the EHM and ran it into the airbox. I used a proper fitting on the side of the airbox. Inside the airbox, I zip-tied a marine piece that is commonly refered to as a "Bilge-Diaper", made of virgin cotton around the fitting. The bilge diaper catches the oil in suspension. I secured additional bilge diaper material to the bottom of the airbox to catch any oil drippings. The remainder of the gases are then pulled, sans oil, into the intake side of the filter. Nice clean air for my CRD, without any of the nastiness that was building up. I check the filter monthly, and so far, it is doing well.

Right.

Rixram · **Posted:** Thu Jul 01, 2010 10:28 am

nursecosmo wrote:

Rixram wrote:

I had photos, but ended up deleting them.

But, basically, I took the EHM and ran it into the airbox. I used a proper fitting on the side of the airbox. Inside the airbox, I zip-tied a marine piece that is commonly refered to as a "Bilge-Diaper", made of virgin cotton around the fitting. The bilge diaper catches the oil in suspension. I secured additional bilge diaper material to the bottom of the airbox to catch any oil drippings. The remainder of the gases are then pulled, sans oil, into the intake side of the filter. Nice clean air for my CRD, without any of the nastiness that was building up. I check the filter monthly, and so far, it is doing well.

Right.

Right as in "Good Idea", or right as in some form of sarcasm?

:CAMPING:

Note: added just because I thought the icon was cool.

Joe Romas · **Posted:** Thu Jul 01, 2010 10:31 am

Rixram wrote:

Or, you could just re-plumb it to go into your airbox, and add a wrap around it to catch the oil. The fumes are pulled into the engine still, but the crap is filtered out. On shutdown, you smell it a little, and when idleing, but that aside, it is preventing the crap build-up on the intake side of the engine and the oil ingestion. I just have to change my airfilter at oil changes.

That's how the first PCV systems worked as mentioned in the above link I posted :SOMBRERO:

Rixram · **Posted:** Thu Jul 01, 2010 10:43 am

Joe Romas wrote:

Rixram wrote:

Or, you could just re-plumb it to go into your airbox, and add a wrap around it to catch the oil. The fumes are pulled into the engine still, but the crap is filtered out. On shutdown, you smell it a little, and when idleing, but that aside, it is preventing the crap build-up on the intake side of the engine and the oil ingestion. I just have to change my airfilter at oil changes.

That's how the first PCV systems worked as mentioned in the above link I posted :SOMBRERO:

Yeah. I know. Why do you think I set it up this way? :ROTFL:

dieselsmoke · **Posted:** Thu Jul 01, 2010 12:19 pm

naturist wrote:

I have a Provent, and while it took a little plumbing ingenuity, it fits. And solves the oil-in-the-intake problem.

I also have a problem with what is called the EHM.

Besides being illegal, do you not understand that the single modification consisting of routing the blow-by back into the intake removed about 80% of the pollution pre-1967 vehicles made, and that by performing an EHM, you turn your vehicle into a pollution machine?

Please, please, please, do it right: put on a Provent or some similar system. Don't just dump your fumes into my air.

You have got to be kidding me. I dont understand for one, why, if you hippies think diesel is so much worse than gas why do you folks have them? Also Honda Hybrids put out about 10x's more "pollution" than any diesel even if the diesel has a tune and is putting out tons of black smoke or "unburnt fuel". It is just a chemical change you can physically see.......And depending on the design of the engine the "blow by" might just be moisture from pressure causing steam due to high pressure.....My EHM does not even smell like any of the "fumes" you are talking about oil,fuel, dog dung. Global warning is a scam used to make money and stimulate jobs. Do I belive the past 100 years of pollution have helped the earth? NO. However the earth goes through life cycles and will regulate itself how it see's fit.

dieselsmoke · **Posted:** Thu Jul 01, 2010 12:23 pm

Must I remind folks this isnt a earth,pollution,global warming,emissions, whatever forum. The guy wants to know about his blow by and how to make his CRD run better. Sorry to go on a tangent but really....Everytime I get on here "oh pollution this, pollution that" thats fine and dandy but the forum is about making the CRD run better.

JL Rockies · **Posted:** Thu Jul 01, 2010 12:45 pm

You have to have at least 1k posts before you can start reminding people of stuff.

Rixram · **Posted:** Thu Jul 01, 2010 12:54 pm

JL Rockies wrote:

You have to have at least 1k posts before you can start reminding people of stuff.

Well, repost his second post, then. You have 2,600 posts! LOL

Anyway, yes, when I think blow-by, I think stuck piston rings or something. It seems these things have copious amounts of it. Blow-by to me says: lost power, lost fuel, lost efficiency and contaminants in the lubrication system.

Or maybe it's that I'm used to gassers and this is my first diesel.

Are rings stuck, or does the higher compression overcome the piston rings. If the former, how to loosen. If the latter, then it is a trait inherent to the design.

stoutdog · **Posted:** Thu Jul 01, 2010 12:56 pm

He didn't say diesel was worse than gas... he said venting CCV fumes into the atmosphere was a very bad idea from a pollution standpoint. Today's modern diesels can be very environmentally friendly. Regardless of one's stance on global warming, pollution being pumped straight into the air we breathe is not a good thing.

But his post was completely relevant... some of us feel that investing the extra money in the Provent is a far more environmentally conscious decision than simply running the EHM. I believe that was the point he was trying to make.

2.8L CRD Blow-By

Who is online