I'm new to mods on diesels but been a Hot Roder forever..
I have a question...based on a observation. Is the ccv mod only necessary for intercooler equipted trucks ? To keep oil off the inter-cooler ? I have raced gas motors for years and now using a vacuum pump to pull vacuum in crank case to help seal rings and increase HP ...up to 30 HP !!
Why wouldn't this be true for a diesel ? As I see it the connection to the intake tube prior to the turbo sucks the gasses out of the crank case...right?
With a turbo making 15-20 PSI of boost has got to be pulling a lot of air thus creating a lot of vacuum in the crank case..sounds good to me !
Am I full of it ??
Just a thought ......
Has anyone attached a vacuum gauge to a "stock' system ??

 

I think there is an advantage just like you stated. IMO, the stock CCV doesn't pull enough vacuum because of the high boost pressures. More boost = more CC pressure. But it must be enough due to the oil getting into the IC. I have plumbed the CCV into the exhaust with this
https://www.ford-trucks.com/forums/a...tid=2680&stc=1
but more vaccum is needed at lower RPM, not enough exhaust flow I guess. What do you think of using the vaccum pump on the engine to pull the vacuum? I'd like to try it but it's assists the brakes so I have'nt messed with it. I'm not sure about the volume it is capable of.

I need to find a truck with the stock CCV and see how much vacuum they make. I've seen 8-10 inches of vacuum on the ones above but that's at peak exhaust flow.

 

Evac (exhaust pipe systems) are not recommended for street use nor are belt driven vacuum pumps for cars with cats & mufflers. This may be due to emissions laws and clogging of cat converters. I don't think any of the "stock" Ford vacuum pumps (belt driven or electric) can supply enough cfm at speed.
They may work at idle...especially the new electric pump from Ford..
I run a Moroso belt driven vacuum pump on my 508 C.I. Pontiac race motor. It has low tension rings and the vacuum is a necessity for ring sealing...especially when cold...other wise it will foul plugs. After it builds some heat it's OK..
At idle it makes 4-5" hg and at 7,000 rpm makes 12-13" hg...It has been proven on the dyno it's worth up to 35 HP...or more. It makes for better ring seal and engine is working in a vacuum as like in a "space walk"...
Above 13" hg you need positve oil feed to wrist pins as vacuum will suck oil mist out of crank case !! Exhaust from pump is expelled into a breather tank to catch any condensation or oil. I have clear lines on my system and you can see the moisture/condesation being draw out of motor on warm ups...got ot keep oil cleaner..You can regulate vacuum if necessary with a regulator or belt/pulley ratio..This pump deal is NOT cheap.....
I saw on here where a member installed a fitting in his oil fill cap and plumbed to a pressure gauge. Think I'll try that with a vacuum gauge..just for my information..
I would post a picture of pump set up but don't know how to on this site...

 

One other question on CCV system...Does this need to be serviced as do breather filters on gas motors do??Is there a filter in it or just a oil seperator deal..??
Can't find any info in service manual....

 

there is just course steel wool in the little dog house on the drivers side valve cover.

 

Thanks...does it require any cleaning or replacing ?

 

I might need to be cleaned when it is removed but I have rarely heard of them clogging up. I usually clean mine only when I have it off. the housing is all sealed so pretty much I just run a can of brake cleaner through it blow it out and reinstall.

 

My truck only has 97K on it and oil has ben faithfully changed every 3K miles since new..I bought it from a friend who was the original owner...and have all paper work. Doubt if it needs cleaning yet.
He wants it back...Oh well..
Thanks

 

I've run the same vacuum system on my hemi race motor and on a couple wedge engines too, only saw about 20HP gain. I doubt these diesels would benefit, HP wise, as they don't have the low tensoin rings....

All the diesels I've done don't have cats, but they do have mufflers. The IC's have stayed clean since the mod. Most guys here just dump it to atmosphere. Really messy and smelly.

 

Kind of figured from your sign in name you were into MOPARS...:-)
....and also when you mentioned the evac system..at least you burn most of your vapors up...evacs are better than dumping them into the atmosphere..no offense intended to anyone on here...I can see wanting to keeps IC's clean...
Virginia doesn't have emission test for diesels yet but mine does have a cat....
They do look for cat when I go throught VA safety inspection...part of exhaust..
Hp gains are different for sure...my engine builder says he saw as miuch as 36 HP gain on dyno . Even though diesels don't use low tension rings having a negative crank case pressure would surley have to be a plus !!! I think I will check my crank case.....just to see.
What class do you race & where ??
Might mention my engine builder works on a prominent NHRA Pro-Stocker's pit crew when he's running on the East coast...learns a lot of tricks that way..

 

I have installed an intercooler on my truck, but haven't done the CCV mod, is this bad, should I do this or is it a big deal?

 

No its not bad as long as you don't mind oily dirty IC boots, dirty engine compartment and the possibility of the oil boots blowing off at high boost. Oh also I have to believe the oil in the cooler hurts its heat transfer ability. But there are tons of superduties running around the haven't done the CCV mod. They just have oil dirty boots.

 

Well so far everything is perfectly clean, it's actually been cleaner then before I installed the intercooler, but I haven't removed the intercooler since I installed it to see how clean it is inside it.

 

Don't have a IC so have no experience with them as to getting oily & diry because of CCV. Vacuum in the crankcase is a good thing..IMO.
So rather than just unhooking the CCV and venting to atmosphere for all us to breathe & smell ( ) why not reroute/relocate nipple in intake system.. ?! You are curing one problem and creating another..IMO.FWIW..
Plug it in the intake tube prior to turbo before IC and install after the IC just prior to entering motor..??? Wouldn't you still maintain the CCV function without oily/dirty IC & boots and having a smelly truck ??
Just a thought...

 

No if you moved the CCV to just before it enters the engine the boost pressure would pressurize the crankcase which out be bad. It either needs to preturbo or vented to atmosphere or exhuast. There has been some who have built a vapor seperator and tried to seperate the oil vapor and return the "clean" gases back into the intake. here are few links to different CCV mods
Cat=0&Number=2327255