Author Topic: Temporary Blow-By Solution  (Read 799 times)

Offline slepr1

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Temporary Blow-By Solution
« on: June 29, 2014 - 10:13:33 AM »
My 440 was rebuild 10 years ago, ran a season or two, maybe 1000 km's on it, then stored for 8 years.   I got it going again this season.   The valve cover breather gets loaded up with blow-by oil vapour and drips on the header creating a puff of smoke.   This is not new.   It did this from the start.   My thinking is the rings didn't seat properly.   The valve covers do have baffles in them.   I have a high volume oil pump on the engine which some say may contribute to excessive vapour.   

Anyway, it was suggested to me to put a 90 degree elbow on the valve cover and run the vapour to the bottom of the carb via a 'tee' with the pcv hose.   This way it will get burned up in the engine and not drip on the headers.   I know this doesn't fix the blow-by.   The engine runs good otherwise, no smoky blue.    Before doing this, I need other opinions or thoughts.   Thanks.
1971 Cuda EFI Pro Touring, 440ci, 3.55
1977 Cordoba, 1969 440ci, M1, 850dp, 509,   727, 3000 stall, 3.75 rear, 4.30 gears
2011 Camaro SS Hennessey
2009 GMC Sierra




Offline 7212Mopar

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1973 Challenger Rallye, AT with 1971 340
2012 Challenger SRT8 392 YJ,  6 spd

Offline Chryco Psycho

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Re: Temporary Blow-By Solution
« Reply #2 on: June 30, 2014 - 09:11:09 AM »
pressure inside the crankcase is normal while running , you do need a PCV system to draw the pressure out , this requires a breather on one side of the engine & hose to the center of the carb or intake from the other side . The high pressure oil pump is not causing this at all & I doubt you have a ring problem with only 600 miles on the engine although the rings may not be fully seated yet

Challenger - You`ll wish You Hadn`t

Offline slepr1

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Re: Temporary Blow-By Solution
« Reply #3 on: June 30, 2014 - 09:16:19 PM »
That's some good info.   Its a must read.  Thanks!    If I understood it correctly, the solution would be to drill out the pcv valve, connect that to a blow-by can, then to the vacuum port at the bottom of the carb.   As for the other valve cover, connect to a breathable blow-by can.

Seems like the pcv valve shuts down when the engine is at high rpm's resulting the blow-by to exit through the valve cover breather (this explanation is obviously the dumbed down version).   This is common in engines that are non-stock or factory high performance.   Now I know.   


FYI


www.shophemi.com/images/media/p-2273-arrington_ccv_bible.pdf
1971 Cuda EFI Pro Touring, 440ci, 3.55
1977 Cordoba, 1969 440ci, M1, 850dp, 509,   727, 3000 stall, 3.75 rear, 4.30 gears
2011 Camaro SS Hennessey
2009 GMC Sierra