What's the best remedy for the PCV oil sucking problem?
#1
What's the best remedy for the PCV oil sucking problem?
Okay, I want to keep oil from being sucked through my PCV because I had big problems with this on my old LS1. About two years ago everyone was putting fuel filters in their PCV tubing. Most people seemed to like the "SMH mod." But then I read a lot about the filters restricting PCV flow and could lead to altered crankcase pressure that could be bad. I have been away from LS1's for a few years but I see now people are using a catch can. Is this regarded as the best remedy now? If the vacuum is strong enough couldn't you pull oil right through a gravity catch can? I'd like some input on this as I'm going to perform a PCV mod soon. Thanks.
#2
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The catch can seems to be the best mod out there if you want to stop oil consupmtion and retain your pcv. The most popualr and effective I would say would be the AMW can. Your gravity problem that your thinking of is solved with the AMW, its a great design which has notched inside walls to prevent oil climbing. The entrance is on the top of the can. The exit is on the side, which is part of a canister that screws into the bottom section like a real filter system. It also has like a drain basket and mesh strainer or steel wool material packed into that top cansiter so if it does suck oil it will seperate from the air stream and drain to the bottom. I know someone has a pic of the inside of it on here somewhere you just gotta find it. Your other route would be to completely remove the pcv system cap off the holes and run breathers on the oil cap valve cover and the hole in the rear driver side valve cover. If you do this YES you lose the benefit of the pcv vacuum....better sealing, less frequent oil changes, no messy breather etc...... I for one run breathers right now but I am soon switching to the catch can. Im tired of cleaning the breathers to prevent oil drips and I get a little bit of oil smell through my HVAC,also on (my frequent) oil changes I somewhat get that gasoline smell which Im assuming is from blowby. My vote is the pcv catch can setup for a daily driver/street/strip car, all out racer only race the car I would say go with breathers. GOOD LUCK
Last edited by santino04; 04-13-2005 at 09:00 PM.
#3
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He basically summed it all up. I am using a AMW catch can, and have not regretted it. Last oil change (3K miles) I had about a half a shot size amount of oil in it. So it is definitely working. But I am still using oil somewhere....
#5
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anyone got pics of this setup? I just did my new motor install and was thinking of putting breathers in the pcv and oilfil on the VC's..I did my break in the other night and Ive got oil all over the firewall from the back of the cover..
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#9
AMW is a ripoff imho, 160$ for something you can do yourself for under $20 with an air compressor line filter from home depot, i have this on the 5.0 and it catches a lotta oil (aftermarket lower intake, sucks like a damn hoover). so far no issues.
#11
Kleeborp the Moderator™
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Originally Posted by Stanger88
AMW is a ripoff imho, 160$ for something you can do yourself for under $20 with an air compressor line filter from home depot, i have this on the 5.0 and it catches a lotta oil (aftermarket lower intake, sucks like a damn hoover). so far no issues.
Either way...
And the LS6 valley cover won't cure it either...I still pull oil through.
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I saw another thread on here talking about using a PCV valve for an LS-era truck engine. It's not really a valve at all... it just has a hole through it. Whoever wrote this article said it solved his oil issue, and that GM was using the same part to remedy other engines with similar problems. He had the part numbers too, but I can't remember them and if I say that the search is down I'll get banned. But anywho, that's apparently a $6 fix, compared to a $160 fix.
#13
Kleeborp the Moderator™
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Originally Posted by Ric
I saw another thread on here talking about using a PCV valve for an LS-era truck engine. It's not really a valve at all... it just has a hole through it. Whoever wrote this article said it solved his oil issue, and that GM was using the same part to remedy other engines with similar problems. He had the part numbers too, but I can't remember them and if I say that the search is down I'll get banned. But anywho, that's apparently a $6 fix, compared to a $160 fix.
I'm still experimenting with my car to figure this out, but even with the LS6 PCV, I still pull oil into my catch can.
#14
Do a search through some of the oil discussions. I switched to 5w40, installed a catch can and the thing is clean! I need to go a bit longer to rule for sure but the 40 oil has helped others.
#17
IS this caused by blowby or shitty designe? I did a compression check on my 5.0 and all cylinders are within 5# of each otehr, that would mean good compression, no? no blowby(above normal)? Also, i think it is b/c i have an aftermarket intake, the PCV on our cars is in the lifter galley area at the rear of the intake, i think its just not baffled very well. Any ideas?
#18
Kleeborp the Moderator™
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I'm beginning to think mine is caused by blowby, but I think others that have had better luck with these mods might be fixing the shitty design.
The design is lacking, that's for sure though. But there are baffles in both valve covers that look just like the baffle in the LS6 Valley cover, and so far both designs have let oil come through. I'm currently trying different mounting positions of the stock-style PCV valves to see if that helps.
My catch can is staying put though. It pulls too much oil in to not use it on my car.
The design is lacking, that's for sure though. But there are baffles in both valve covers that look just like the baffle in the LS6 Valley cover, and so far both designs have let oil come through. I'm currently trying different mounting positions of the stock-style PCV valves to see if that helps.
My catch can is staying put though. It pulls too much oil in to not use it on my car.
#19
That's what she said...
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All you guys who have the AMW can, do you realize that they up and DOUBLED their price OVERNIGHT? I understand that they have a kick *** product and they sponsor the board, but that is outrageous for what it is.
https://ls1tech.com/forums/generation-iii-external-engine/428410-pics-greddy-catch-can-install-56k.html
Thats what i did about my oil problems. Only been on for almost 2 week, and havent got any oil in the SIGHTGLASS.
https://ls1tech.com/forums/generation-iii-external-engine/428410-pics-greddy-catch-can-install-56k.html
Thats what i did about my oil problems. Only been on for almost 2 week, and havent got any oil in the SIGHTGLASS.
#20
Kleeborp the Moderator™
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Originally Posted by TheBlurLS1
All you guys who have the AMW can, do you realize that they up and DOUBLED their price OVERNIGHT? I understand that they have a kick *** product and they sponsor the board, but that is outrageous for what it is.
https://ls1tech.com/forums/showthread.php?t=428410
Thats what i did about my oil problems. Only been on for almost 2 week, and havent got any oil in the SIGHTGLASS.
https://ls1tech.com/forums/showthread.php?t=428410
Thats what i did about my oil problems. Only been on for almost 2 week, and havent got any oil in the SIGHTGLASS.