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cheeze433 · 07-01-2009, 09:54 AM

Hey guys,
Still learning about engines. What is the difference between an open and closed crankcase? I know an open uses a PCV valve. But, are there advantages to running open vs. closed? How can you tell if your engine is supposed to be one or the other? Can you run an open crankcase closed? If so, what are the pros and cons of switching systems? Are engines unique, meaning some are built to have an open system, some are built to be closed? If so, how can you tell the difference? What is affected by the open/closed system? I have a PCV hooked up to my carb but if I plug everything, it seems to run alright either way. What's the deal with this stuff? Thanks in advance.

07-01-2009, 09:54 AM	#1
cheeze433 Join Date: Jun 2009 Vehicle: 1985 Mustang lx Location: PA Posts: 10	PCV crankcase question Hey guys, Still learning about engines. What is the difference between an open and closed crankcase? I know an open uses a PCV valve. But, are there advantages to running open vs. closed? How can you tell if your engine is supposed to be one or the other? Can you run an open crankcase closed? If so, what are the pros and cons of switching systems? Are engines unique, meaning some are built to have an open system, some are built to be closed? If so, how can you tell the difference? What is affected by the open/closed system? I have a PCV hooked up to my carb but if I plug everything, it seems to run alright either way. What's the deal with this stuff? Thanks in advance.