LSX E85 PCV venting question - Yellow Bullet Forums

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Old 11-24-2011, 09:49 AM   #1
cjg454ss
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Default LSX E85 PCV venting question

424cu LSx, 106mm turbo, 20-25psi, 7000 rpm shift. blowthru CSU

i m not sure how much to vent, i couldnt get the moroso evac to work correcly, im thinking of:

2= -10 lines from Valve covers to catch can
1= -12 line from the valley cover to same catch can


Is that enough to vent?
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Old 11-24-2011, 10:10 AM   #2
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Default Re: LSX E85 PCV venting question

My buddy was having problems blowing valve cover gaskets out with his LS3, we took the plate over the lifter valley and tapped a 1/2" npt hole in the plate into the factory breather box and ran an AN-10 line to a breather tank, no problems after that.
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Old 11-24-2011, 02:55 PM   #3
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Default Re: LSX E85 PCV venting question

Your plan sounds like plenty to me.
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Old 11-24-2011, 06:34 PM   #4
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Default Re: LSX E85 PCV venting question

ok, the reason for the 3 is i have all the hoses and fittings for the two -10s off the valve covers. i didnt think 2 -10s was enough so i figured a -12 in the valley would be best,

would 2 -10s off each valve cover be enought?i
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Old 11-24-2011, 06:35 PM   #5
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Default Re: LSX E85 PCV venting question

curious as well, I am just going to run two -10 to seperate breathers....
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Old 11-24-2011, 08:14 PM   #6
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Default Re: LSX E85 PCV venting question

mightymouse uses 2 3/8" lines off each valve covers to a breather tank he actually builds his own that has a pressure relief valve built in the top. That car is making 1300+rwhp and he said he has no crankcase pressure issues with those 2 lines. So I would think 2 #10 lines would be way more than enough
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Old 11-24-2011, 08:39 PM   #7
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Default Re: LSX E85 PCV venting question

Quote:
Originally Posted by AutomagicLS1 View Post
mightymouse uses 2 3/8" lines off each valve covers to a breather tank he actually builds his own that has a pressure relief valve built in the top. That car is making 1300+rwhp and he said he has no crankcase pressure issues with those 2 lines. So I would think 2 #10 lines would be way more than enough

3/8 is -6, i dont see two -6 vents getting rid of the crank case pressure. also i dont think that car makes 1300+rwhp.
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Old 11-24-2011, 09:46 PM   #8
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Default Re: LSX E85 PCV venting question

8.50' s @ 3700 lbs... It's makin over 1000 for sure.
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Old 11-25-2011, 12:31 AM   #9
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Default Re: LSX E85 PCV venting question

Quote:
Originally Posted by cjg454ss View Post
3/8 is -6, i dont see two -6 vents getting rid of the crank case pressure. also i dont think that car makes 1300+rwhp.
161 @ basically 3800lbs.

Here's what hes using

http://ls1tech.com/forums/15608548-post8.html
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Old 11-25-2011, 09:55 AM   #10
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Default Re: LSX E85 PCV venting question

Im taking the advice from a guy on my truck forum and he is making over 800 rwhp with his ls2 and twin setup. He told me -12 off each valve cover and he also suggested venting the valley cover, but for my build ~600 rwhp, im just doing the -12 fittings on each valve cover to a -12 T to one breather tank i bought from RPS. hopefully that will work, if it doesnt ill drill and tap the valley cover and put a -6 hose on there. Also 1st post woohoo!!
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Old 11-25-2011, 10:54 AM   #11
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Default Re: LSX E85 PCV venting question

Better hit the newbie thread before the nazis attack you..
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Old 11-25-2011, 11:11 AM   #12
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Default Re: LSX E85 PCV venting question

uh oh, ok ill do that, Thanks!
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Old 11-26-2011, 06:26 PM   #13
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Default Re: LSX E85 PCV venting question

Having more than enough venting is never an issue. One one my cars has only a pair of -12 vent to a single catch can. One of the others has a pair of 1-1/4" vents to a pair of catch cans.

Not having enough venting will create many issues, leaking turbos, blown gaskets, or even worse. What happens is those small vents can't keep up and you push out a couple of quarts of oil under the tires at speed. Big vents are ok.
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Old 11-26-2011, 07:00 PM   #14
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Default Re: LSX E85 PCV venting question

OK so I should be OK with a -12 off each valve cover T-ing into a single -12 to one catch can?
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Old 11-26-2011, 07:07 PM   #15
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Default Re: LSX E85 PCV venting question

would like to know this as well, we are doing a NA 408 build now and im running just 1 -12 from one valve cover to a catch can. Will this be enough?
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