Re: blow by out breather..
[Re: 8urvette]
#3048752
06/07/22 10:01 PM
06/07/22 10:01 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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How wide did you open the top and 2nd rings too? Are these new rings or the old, broken in original to this build rings Sounds like you may have twisted a oil ring and spacer up when installing the pistons I've never done that I would do a leak down test on the motor when cold and hot, rock the crank back and forth a little bit at TDC also
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: blow by out breather..
[Re: rebel]
#3048853
06/08/22 11:15 AM
06/08/22 11:15 AM
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Joined: Dec 2005
Posts: 11,692 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,692
Fulton County, PA
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Leak it.
Vac-u-pan will help to a point, if you have open headers. Mufflers and/or exhaust system reduces the effectiveness considerably.
If the results don't match the theory, change the theory.
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Re: blow by out breather..
[Re: 8urvette]
#3049034
06/08/22 11:41 PM
06/08/22 11:41 PM
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Joined: Mar 2003
Posts: 9,100 Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,100
Rogue River, OR
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If it's a 4.3750 bore .026-.028 is what I come up with which isn't horrible. What did you gap them to?
What kind of ring is it? Not sure you can get away with spraying that much without a stainless (Mahle GNS) or ductile iron (Hellfire) top ring.
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Re: blow by out breather..
[Re: rickraw]
#3049909
06/12/22 12:37 PM
06/12/22 12:37 PM
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Joined: Aug 2003
Posts: 4,696 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,696
On the parachute mount
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On my sons small block , we gapped the rings .030 . He welded bungs on his valve covers and ran -10 to the headers . Put a separate -10 to a catch can with a check valve . At idle it pulls just off of 0 on a vac gauge . On the track at the stripe it has 5 inches pan vac
....BAD A$$ STREET CAR.....
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Re: blow by out breather..
[Re: 8urvette]
#3049912
06/12/22 12:41 PM
06/12/22 12:41 PM
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Joined: Dec 2012
Posts: 257 Alberta
440_Offroader
enthusiast
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enthusiast
Joined: Dec 2012
Posts: 257
Alberta
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Might have a top or second ring stuck or not sealing. A small mark on the piston by the ring, or small piece of dirt in the ring land, could hold a ring up. The oil ring can be doing its job, by keeping oil out of the combustion chamber. It doesn't do much for keeping combustion out of the crankcase with its low tension. It's a lot of work to check, but if it wasn't like that before, then something isn't quite right. Aside from that, and to be more relative to your question.... Similar to a PCV system with a catch can, I've seen industrial engines have special canister with an element inside. They run in after the air filter (or intake manifold like a PCV), to draw the crankcase pressure down. The coalescing element catches the oil vapor, and the catch can has a small line for oil to drain back down to the oil pan. They have relatively large lines, so tend to draw too much vacuum in some instances. A flow control valve is then installed, to keep crankcase pressure at -1"H2O. Just an idea for you, but may be too much, for under the hood of your car.
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