Ring flutter w/ deleted PCV??
03-22-2007, 11:35 AM
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Ring flutter w/ deleted PCV?? alright you guys.... with the deletion of the pcv am i going to develop some ring flutter??? guy on a local board brought it up and i figured id ask some people more experience solely on LSX engines? 
03-22-2007, 12:52 PM
#3
I have never heard of the lack of PCV causing ring flutter. From my experience, it has been caused by too large of tolerances and too many rpms.
"Piston ring flutter occurs when the piston rings change direction so quickly that they are forced from their seat on the ring land and the cylinder walls, resulting in a loss of cylinder sealing and power as well as possible breakage of the ring."
"Piston ring flutter occurs when the piston rings change direction so quickly that they are forced from their seat on the ring land and the cylinder walls, resulting in a loss of cylinder sealing and power as well as possible breakage of the ring."
03-22-2007, 05:42 PM
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Originally Posted by brad8266
Without PCV and no breather you will experience a lot of blowby past the rings and more wear on engine internals to include seals.
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03-23-2007, 12:08 AM
#8
Originally Posted by brad8266
Without PCV and no breather you will experience a lot of blowby past the rings and more wear on engine internals to include seals.
03-23-2007, 06:33 AM
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Originally Posted by thunderdan74
The amount of blow by does not change. It just never gets out of the engine and all the combustion by-products, including water, contaminate your oil fast.
03-23-2007, 10:17 AM
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Originally Posted by brad8266
It will lead to parts wear very much faster, to inlcude rings, so the blowby will be increased quickly.
umm... its not going to wear out parts more quickly if you change your oil more often...
im not asking if its going to wear stuff out, im asking particularly about ring flutter. Some of the "book smart" old school guys who arent really hands on seem to think im going to get ring flutter running without a PCV system hooked up. I just wanted to get some ideas from you guys because i had never heard of it being a problem with LS1's, or any other newer generation engine either.
03-23-2007, 10:46 AM
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Im sorry I forgot you are running a breather again. 
Yeah it wont wear out parts as long as the pressure has somewhere to go. I have never heard on the ring flutter with no PCV thing and I doubt it is true.
Yeah it wont wear out parts as long as the pressure has somewhere to go. I have never heard on the ring flutter with no PCV thing and I doubt it is true.
03-23-2007, 10:48 AM
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Originally Posted by brad8266
Im sorry I forgot you are running a breather again. Yeah it wont wear out parts as long as the pressure has somewhere to go. I have never heard on the ring flutter with no PCV thing and I doubt it is true.
Yeah it wont wear out parts as long as the pressure has somewhere to go. I have never heard on the ring flutter with no PCV thing and I doubt it is true.
03-24-2007, 02:05 PM
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I have read a few different articles on ring flutter and all say that crank case pressure does amplify the ring flutter problem quite a bit. Im no expert on this subject by any means and I cannot explain in detail why it does but it does makes sense when you think about it. Also, the combustion chamber air/fuel contamination from the exsessive blow by is something also to consider. Some have reported major gains with simply bolting a vacuum pump and running negative crank case pressures.
03-25-2007, 07:44 PM
#14
Originally Posted by Jeremiah
Some have reported major gains with simply bolting a vacuum pump and running negative crank case pressures.
As far as ring flutter, I would think that if you have enough clearance for the rings to actually flutter, you got more problems than just the PCV.
You also have to consider that taper face rings with an inside bevel, are made to **** it the ringland slightly. This is especially true for taper face second rings. One an upstroke, they have less drag, and upon reversing direction, **** slightly and use the bottom edge of the ring to "scrape" the oil off the cyl wall.
04-11-2007, 08:18 PM
#15
I'd like to see a picture of an f-body engine bay with a vaccuum pump. I read a dyno post or something and one of the things that they did was to add one of these pumps but he said that it was messy which I really didn't understand. He said that he removed it and it made no difference. Would one of these pumps improve or hurt driveability with a big cam that experiences bucking/surging between 1800RPM and 2000RPM in a steady speed situation despite 100's of hours of tunning?
