what causes blow-by?

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04-27-2004, 12:16 PM

turboDXcoupe

1.5 BAR

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Join Date: Mar 2003

Posts: 1,134

what causes blow-by?

yeah ive been hereing about that lately and i just dont get it.......i know newb question

04-27-2004, 12:47 PM

projekteg

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Re:what causes blow-by?

excessive pressure in the crank case i believe.......

04-27-2004, 02:31 PM

Chacko

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Posts: 1,495

Re:what causes blow-by?

oil blow by? Usually tears in the piston rings... oil gets up and burns into the cylinder. Other things can cause oil to get in there as well, like teg mentioned, or possibly something wrong with a valve and oil leaking from there.

04-27-2004, 10:21 PM

turbo z24 guy

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Re:what causes blow-by?

bad rings.

04-27-2004, 10:26 PM

fork

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Join Date: Apr 2003

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Re:what causes blow-by?

Like they said bad rings or too much crankcase pressure, which could be cause from a bad pcv or pumping boost into the crank case

04-27-2004, 10:52 PM

djfob

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Re:what causes blow-by?

Is this the reason for catch cans?or is it for a whole different purpose.

04-28-2004, 09:11 AM

Semnos

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Join Date: Dec 2002

Posts: 3,828

Re:what causes blow-by?

I have bad rings in my A6

...cilinder 2+3...burns oil. Time for an engine swap and build the A6

04-28-2004, 10:06 AM

chingro

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Join Date: Dec 2002

Posts: 698

Re:what causes blow-by?

too much crank case pressure, bad PCV crank case venting goes wrong, not changing oil as frequent as you should, will cause rings and cylinder walls to be damaged....

thus causing blow by.