Gen3 5.3 -8AN breather probs with P1SC--pissing oil!!!
04-19-2018, 08:19 PM
#1
Gen3 5.3 -8AN breather probs with P1SC--pissing oil!!!
I'm pretty long winded so bare with me:
had a P1SC with LS9 cam +4*. 12psi, 477whp yada yada yada: ran a single -8 off the oil cap and never had a problem. Still had the TB to VC breather tube and PCV
NOW: I have another P1SC because LSFest, same pulley combo as before, 212/218 112 straight up, 1 7/8 exhaust, 3.5 all the way back. Tb to VC breather still in place.
I have a breather "suction" hose off the intake, the oil cap vented much like before and a -8 welded onto the pcv hole. Effectively should have more breathing than ever before. However....
MY PCV BUNG IS PISSING oil. And I mean oil is making its way through ~5ft of -8, and spraying all over the truck. The factory baffle is in place in the valve cover. The fitting is not the problem. The welding is not the problem. Liquid oil is leaving my engine via the pcv hole. In 30ish miles today I lost ~.25qt and I'm not even beating on the truck. Highest she saw was 4400rpm.
How are you guys venting your motors and what can I do to help this? I can't tow a car 9hrs to Vegas losing a qt of oil every 120mi.
Motor has maybe 2500mi since the last P1 install, so unless my 5.3 did something in that short time, it's not an excessive ring wear problem
had a P1SC with LS9 cam +4*. 12psi, 477whp yada yada yada: ran a single -8 off the oil cap and never had a problem. Still had the TB to VC breather tube and PCV
NOW: I have another P1SC because LSFest, same pulley combo as before, 212/218 112 straight up, 1 7/8 exhaust, 3.5 all the way back. Tb to VC breather still in place.
I have a breather "suction" hose off the intake, the oil cap vented much like before and a -8 welded onto the pcv hole. Effectively should have more breathing than ever before. However....
MY PCV BUNG IS PISSING oil. And I mean oil is making its way through ~5ft of -8, and spraying all over the truck. The factory baffle is in place in the valve cover. The fitting is not the problem. The welding is not the problem. Liquid oil is leaving my engine via the pcv hole. In 30ish miles today I lost ~.25qt and I'm not even beating on the truck. Highest she saw was 4400rpm.
How are you guys venting your motors and what can I do to help this? I can't tow a car 9hrs to Vegas losing a qt of oil every 120mi.
Motor has maybe 2500mi since the last P1 install, so unless my 5.3 did something in that short time, it's not an excessive ring wear problem
04-20-2018, 10:32 AM
#3
IDK man. I run a 70mm turbo and just plumbed the pass vent tube over to the drivers side (idiotic pressed in designed PCV Valve) and then to a catch can that vents to atmosphere. Haven't had much of a problem.
If I were to take a guess, I'm betting there is no baffle where your -8AN mounts into the valve cover and therefore the oil splashing around combined with the crankcase pressure is shoving your oil into the -8AN hose and out. I know my catch can catches a decent amount of crap where I have to drain it about every 1000 miles and add 1/2 a qt.
If I were to take a guess, I'm betting there is no baffle where your -8AN mounts into the valve cover and therefore the oil splashing around combined with the crankcase pressure is shoving your oil into the -8AN hose and out. I know my catch can catches a decent amount of crap where I have to drain it about every 1000 miles and add 1/2 a qt.
04-20-2018, 11:11 AM
#4
I've been reading about this til I'm blue in the face. Here is what I plan to do:
route oil cap breather to intake suction line. I'll be lubing the face of my P1 impeller. Oh well.
Loop pcv vent vent line a couple times and route to catch can instead of atmosphere
there is the factory baffle in the valve cover, under the bung. Never modified that. Just removed pcv valve, rubber retainer/o ring and welded on -8. Lots of ppl run -10, I ended up with -8 by accident. Thanks eBay.
route oil cap breather to intake suction line. I'll be lubing the face of my P1 impeller. Oh well.
Loop pcv vent vent line a couple times and route to catch can instead of atmosphere
there is the factory baffle in the valve cover, under the bung. Never modified that. Just removed pcv valve, rubber retainer/o ring and welded on -8. Lots of ppl run -10, I ended up with -8 by accident. Thanks eBay.
04-20-2018, 11:55 AM
#5
My tuner did suggest running a 1/2" vent tubes instead of 3/8. They said the boosted LS engines do require more venting and the 3/8 tubes can't keep up.
Ive even considered drilling and tapping a hold into the exhaust, then running the vent tubes there. Old circle track trick.
Ive even considered drilling and tapping a hold into the exhaust, then running the vent tubes there. Old circle track trick.
04-20-2018, 12:01 PM
#6
I'm curious as to what GM Engineer idiot decided it was a good idea to press the PCV into the valve cover on my 03. I figured it would be a simple fix to knock the bottom off the pcv, empty the guts and use it as a hose bib, but instead I can't get the damn thing out without removing the valve cover and using a press; and nobody has time for that mess right now.
I have some older valve covers laying around that have the pcv inserts for easy replacements. Maybe Ill just swap drivers side with one of those.
I have some older valve covers laying around that have the pcv inserts for easy replacements. Maybe Ill just swap drivers side with one of those.
04-20-2018, 12:30 PM
#7
-8 is .500, nominally.
8/16= .5 divide AN size by 16 for a rough equivalent to inches. Unfortunately, nobody sticks to that scale as AN was intended, and you can buy "-12" with an ID of .525" so....
anyway, my "-8" is .490 ID. So I'm already at 1/2"
8/16= .5 divide AN size by 16 for a rough equivalent to inches. Unfortunately, nobody sticks to that scale as AN was intended, and you can buy "-12" with an ID of .525" so....
anyway, my "-8" is .490 ID. So I'm already at 1/2"
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