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post #1 of 29 Old 04-08-2013, 07:03 AM Thread Starter
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Ccv mod question.

Was thinking of doing this mod today. Since they are routing it in the intake does that mean it has to stay under vacuum to work properly? Is there a downside to doing this? Thanks


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post #2 of 29 Old 04-08-2013, 07:10 AM
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It does not have to stay under vaccum. The downsides of doing the mod is that it doesn't pass emissions tests (if you've got to worry with that in your state) and sometimes the fumes coming out of the pipe stink pretty bad. I smell mine sometimes when the wind is blowing and I'm sitting in a drive thru with my window down. But other than that, it is a great mod.



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post #3 of 29 Old 04-08-2013, 07:10 AM
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I have routed mine into the atmosphere. I did a ton of research and could find no solid evidence vacuum was necessary. Most high performance race machines I've been around vent into atmosphere so that's good enough for me. Nobody on here has reported any negative effects. If you research CCV on google you can find the history of its origin. Using vacuum pressure to suck fumes back into intake was an EPA mandate, which was initially resisted by the manufactures. CCV was not born to help the engine in any way, only the environment.

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post #4 of 29 Old 04-08-2013, 07:36 AM Thread Starter
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What size hose do I use and how long? I already have a plug.

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2004 CC SB 6.0
4 Inch Turbo back Exhaust
S&B Intake
Sct with Vivians looney wild tune.
Egr Delete
Arp Head studs and oem gaskets.
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post #5 of 29 Old 04-08-2013, 07:39 AM
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Quote:
Originally Posted by Stumppy View Post
What size hose do I use and how long? I already have a plug.

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I used 3/4 hose and ran it inside the frame rail back to the driver side rear tire.

the only thing i have heard that you need to be careful of is causing too much resistance. from what i have read it needs to have as little as possible

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post #6 of 29 Old 04-08-2013, 07:42 AM
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I use 1in tubing and only make mine long enough to go from the valve cover to the frame (about 2 ft).

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post #7 of 29 Old 04-08-2013, 05:56 PM
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Quote:
Originally Posted by Dirty_Stroke View Post
It does not have to stay under vaccum. The downsides of doing the mod is that it doesn't pass emissions tests (if you've got to worry with that in your state) and sometimes the fumes coming out of the pipe stink pretty bad. I smell mine sometimes when the wind is blowing and I'm sitting in a drive thru with my window down. But other than that, it is a great mod.
Quote:
Originally Posted by jetjock15 View Post
I have routed mine into the atmosphere. I did a ton of research and could find no solid evidence vacuum was necessary. Most high performance race machines I've been around vent into atmosphere so that's good enough for me. Nobody on here has reported any negative effects. If you research CCV on google you can find the history of its origin. Using vacuum pressure to suck fumes back into intake was an EPA mandate, which was initially resisted by the manufactures. CCV was not born to help the engine in any way, only the environment.
Going to disagree with you gentlemen, but nothing new with that. There have been plenty of folks who have done it wrong with disastrous effects like blown main seals from too much crankcase pressure.

The lack of vacuum will result in increased amount of blow by. The vacuum pulled on the crankcase Actually helps seal the rings against the cylinder walls. That's why lots of racers run vacuum pumps Rob. :

If you decide to do this make sure you use a 1" line. You might get by for a while with 3/4" but I wouldn't do it.
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post #8 of 29 Old 04-08-2013, 08:08 PM
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Originally Posted by PGreenSVT View Post
Going to disagree with you gentlemen, but nothing new with that. There have been plenty of folks who have done it wrong with disastrous effects like blown main seals from too much crankcase pressure.

The lack of vacuum will result in increased amount of blow by. The vacuum pulled on the crankcase Actually helps seal the rings against the cylinder walls. That's why lots of racers run vacuum pumps Rob. :

If you decide to do this make sure you use a 1" line. You might get by for a while with 3/4" but I wouldn't do it.
This is interesting Mitch. I've never heard this downside to doing the ccv mod. Kinda makes me wonder if I should put it back like it was factory. Seems like blow by would be worse on the motor than oil going through the turbo and intercooler...



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post #9 of 29 Old 04-08-2013, 08:36 PM Thread Starter
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Well after hearing that I guess I build a catch can and vent it back to the intake.


2004 CC SB 6.0
4 Inch Turbo back Exhaust
S&B Intake
Sct with Vivians looney wild tune.
Egr Delete
Arp Head studs and oem gaskets.
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post #10 of 29 Old 04-08-2013, 09:08 PM
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Quote:
Originally Posted by PGreenSVT View Post
Going to disagree with you gentlemen, but nothing new with that. There have been plenty of folks who have done it wrong with disastrous effects like blown main seals from too much crankcase pressure.

The lack of vacuum will result in increased amount of blow by. The vacuum pulled on the crankcase Actually helps seal the rings against the cylinder walls. That's why lots of racers run vacuum pumps Rob. :

If you decide to do this make sure you use a 1" line. You might get by for a while with 3/4" but I wouldn't do it.
There is absolutely nothing wrong with using 3/4" hose as that is the factory size hose fitting for the CCV. You will not "increase" flow by using 1" since it has to go through a 3/4" fitting to get to the hose anyway. As long as there are no kinks or high spots in the hose, you should never have an issue.

That being said, I use a canister and route back to the intake. I mainly did it because of the smell, but I also did not want to mess with the vacuum effect going on.

Here is my setup...







This is on my 7.3L, but it is the same concept for the 6.0L

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Last edited by Justin@DP-Tuner; 04-08-2013 at 09:11 PM.
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