can someone please ecplain blow by to me. i was driving yesterday and blew the pcv valve out. my friend said he thinks i have too much blow by. before the pcv valve blew out my car smoked bad(oil) but now it's really bad

 

Blow by is combustion chamber pressure that has leaked past the piston rings into the crank case.

Typically, blow by is seen on turbocharged motors with poor tunes or spiking issues that have cracked ringlands causing low compression. It could happen on a stock engine with worn rings, though. Run a compression and leakdown test to make sure the rings are still holding decent compression.

 

i thought any engine will have a certain amount of blow by? i did notice my 00 civic si seems to have quite a bit of blow by...oh lord i hope nothing is wrong

 

Yes, there was always be blowby...even in a freshly rebuilt motor because the ring gap will still allow some combustion chamber gases into the combustion chamber.

 

ah yes... blow by, the most hated thing for boosted hondas. How much smoke is coming out of your valve cover? If it's at idle and your getting puffs of smoke then you sir have craked ringlands. under throttle you should see some smoke which is normal.

Like Mr Schmoo said, Compression test will be your answer. Good luck.

 

How do you know when you experience a blow by?

 

just a little smoke out of the valve cover, but when i get on it it's like a smoke bomb. like something from a james bond movie

 

Sorry to sound dumb, When u say ringlands what does this mean? do u mean piston rings or sleeves?

 

Ringlands are the area of the piston between the rings. Those will crack with a poor tune. If the ringlands are cracked, new pistons are required.