Smoke pouring out of my oil cap breather.
04-15-2007, 06:35 PM
#1
Smoke pouring out of my oil cap breather. I deleted my PCV a few weeks ago but I was concerned that I wasn't venting the crankcase enough so today I put a big breather on the oil filler cap. Well it is acting more like a chimney because smoke is just pouring out of it. After a short drive the underside of my hood had crap all over it and smoke was still coming out of the breather. A lot of smoke. The smoke appears to be white.
04-16-2007, 07:29 AM
#3
Well I know #7 has 36% leakdown but the rest of the cylinders were all 10%. I was really hoping to get through this drag season even with #7 being bad. Could one bad ring be causing all of that smoke? I doubt it because the smoke is coming out of the passenger side breather and #7 is on the driver's side. The driver's side breather didn't have much smoke coming out of it at all.
04-18-2007, 08:22 AM
#7
Originally Posted by EDS01SS
take the breather off,start the car up and put your hand over the hole. if you can feel air trying to push your hand away then its time for a rebuild.
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04-18-2007, 09:24 AM
#9
Originally Posted by PewterZ28
I'll do that but isn't there going to be "some" air trying to push through regardless? I mean, how much pressure are we talking about...a little, moderate, or a lot?
if you were to blow pretty hard on your hand that is about what it will feel like
04-18-2007, 10:37 AM
#10
If you had 36% leakage on the #7... that is not good.. as far as which breather the smoke is exiting from.. remember that it is leaking through the cyl rings.. at the bottom of the block and not leaking from the top (valve/seals) .. so, the blow by could be routing to the passenger side breather as an easy path vs going to your driver side. (IMO, but I would expect to see blow by coming out of both !?)
04-18-2007, 10:59 AM
#11
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I know nothing about removing the PCV on LS1 but I have a '67 327 in my '56 Chevy.
In order to correctly do passive crackcase ventilation it has a road draft tube connected directly to the crankcase area, breathers in both rocker arm covers and the oil fill cap breather through the intake manifold into the crankcase.
On top of that, I think it needs breathers on the pan as well but doesn't have those yet.
I don't think your engine is venting properly with just openings on the top end, IMO.
In order to correctly do passive crackcase ventilation it has a road draft tube connected directly to the crankcase area, breathers in both rocker arm covers and the oil fill cap breather through the intake manifold into the crankcase.
On top of that, I think it needs breathers on the pan as well but doesn't have those yet.
I don't think your engine is venting properly with just openings on the top end, IMO.
