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Excessive blowby out of breather... #739571 07/03/10 06:14 PM 07/03/10 06:14 PM
Joined: Feb 2006 Posts: 1,954 Illinois SGTFURY62 OP top fuel
SGTFURY62 OP top fuel Joined: Feb 2006 Posts: 1,954 Illinois	Well I have the 360 running fairly well in the old truck (1976) but it has alot of blowby coming out of the passenger side valve cover breather. Nothing out of the drivers side pcv just all out of the passengers side. Is not smoking out of exhaust that I can see. Any ideas? I figured worn rings but exhaust is clear.

Re: Excessive blowby out of breather... [Re: SGTFURY62] #739572 07/03/10 07:10 PM 07/03/10 07:10 PM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	Do you have a baffle in the valve cover?

Re: Excessive blowby out of breather... [Re: ireland383] #739573 07/03/10 07:12 PM 07/03/10 07:12 PM
Joined: Jan 2003 Posts: 29,652 Hamtramck, PA A Alaskan_TA Fluffy Balladeer
Alaskan_TA Fluffy Balladeer A Joined: Jan 2003 Posts: 29,652 Hamtramck, PA	Start with a compression check.

Re: Excessive blowby out of breather... [Re: SGTFURY62] #739574 07/03/10 07:20 PM 07/03/10 07:20 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Is the vacuum source to pcv adequate? And have you tried a new pcv valve?

Re: Excessive blowby out of breather... [Re: Alaskan_TA] #739575 07/03/10 07:22 PM 07/03/10 07:22 PM
Joined: Jan 2003 Posts: 20,783 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,783 A collage of whims	Usually starts coming out of the breathers before the exhaust. Might need valve seals or guides, in which case some smoke out of the tailpipes on deceleration might be noticed. Smoke on acceleration is typically poor ring seal. As noted, do a compression test and a leakdown test, and besides taking the readings, listen for air coming out of the carb (intake valve) or tailpipe (exhaust valve).

Re: Excessive blowby out of breather... [Re: buildanother] #739576 07/03/10 07:37 PM 07/03/10 07:37 PM
Joined: Feb 2006 Posts: 1,954 Illinois SGTFURY62 OP top fuel
SGTFURY62 OP top fuel Joined: Feb 2006 Posts: 1,954 Illinois	Quote: Is the vacuum source to pcv adequate? And have you tried a new pcv valve? No, but going to go and get one asap. Also, will do a compression check as when I pulled pcv out of valve cover that side too was blowing smoke.

Re: Excessive blowby out of breather... [Re: buildanother] #739577 07/03/10 08:26 PM 07/03/10 08:26 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Is the vacuum source to pcv adequate? And have you tried a new pcv valve? Do first. Then comp test. Then pull a valve cover and look for pieces of valve stem seal laying down in the valve spring cup area. Fastest 300

Re: Excessive blowby out of breather... [Re: Crizila] #739578 07/03/10 08:37 PM 07/03/10 08:37 PM
Joined: Jan 2003 Posts: 931 D dulcich super stock
dulcich super stock D Joined: Jan 2003 Posts: 931	1. Valve guides won't cause blowby. 2. PCV valve vacuum won't do anything but suck in the blowby. 3. Compression check really won't tell you much. 4. Valve seals won't cause blowby 5. You engine is plum wore out. 6. Schooling is now completed. -dulcich

Re: Excessive blowby out of breather... [Re: dulcich] #739579 07/03/10 08:41 PM 07/03/10 08:41 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Point #2 Exactly. Because every engine has a little blowby.

Re: Excessive blowby out of breather... [Re: dulcich] #739580 07/04/10 12:10 AM 07/04/10 12:10 AM
Joined: Jan 2003 Posts: 27,468 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,468 So Cal	Quote: 1. Valve guides won't cause blowby. 2. PCV valve vacuum won't do anything but suck in the blowby. 3. Compression check really won't tell you much. 4. Valve seals won't cause blowby 5. You engine is plum wore out. 6. Schooling is now completed. -dulcich I just experianced the eventual fate of #5 I had noticed excessive blowby out of my breather in the Cuda about 6 month ago. Hot cranking would puff smoke before it even fired. Motor had original 1968 pistons and bore. About 210,000 miles. I did a hone and bearing job in 1993 about 60,000 miles ago. A valve job about 30K mile ago. Compression was good at 140 psi and even. Motor was weak. Would not really tune right. Then #6 rod bearing let go a couple weaks ago. . . . . Motor was plum wore out.

Re: Excessive blowby out of breather... [Re: SGTFURY62] #739581 07/04/10 08:20 AM 07/04/10 08:20 AM
Joined: Nov 2004 Posts: 5,118 Alone in the darkness gamagoat6x6 super street
gamagoat6x6 super street Joined: Nov 2004 Posts: 5,118 Alone in the darkness	I have seen the PCV hose blocked solid or collapsed internally and the passage in the carb blocked with crud. Make sure you have not only the correct vacuum reading at the valve but also lots of volume. Your engine should stall if you pull the PCV valve out of the hose. If you replace the hose don`t use fuel line as it will collapse in short order. `02 RAM2500 SPORT V10 4x4 `06 GMC sierra NO cars

Re: Excessive blowby out of breather... [Re: gamagoat6x6] #739582 07/04/10 01:02 PM 07/04/10 01:02 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: I have seen the PCV hose blocked solid or collapsed internally and the passage in the carb blocked with crud. Make sure you have not only the correct vacuum reading at the valve but also lots of volume. Your engine should stall if you pull the PCV valve out of the hose. If you replace the hose don`t use fuel line as it will collapse in short order. Check first, but dulcich's #5 is probably correct. Just a good idea to verify you don't have another simple to fix problem before you start re-ringing, etc. Fastest 300

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