what causes blow-by?

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Apr 27, 2004 | 12:16 PM

turboDXcoupe

Thread Starter

1.5 BAR

Joined: 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

Apr 27, 2004 | 12:47 PM

projekteg

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Joined: Apr 2003

Posts: 11,057

Re:what causes blow-by?

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

Apr 27, 2004 | 02:31 PM

Chacko

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Joined: Dec 2002

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.

Apr 27, 2004 | 10:21 PM

turbo z24 guy

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Joined: Nov 2003

Posts: 452

Re:what causes blow-by?

bad rings.

Apr 27, 2004 | 10:26 PM

fork

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Joined: Apr 2003

Posts: 2,570

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

Apr 27, 2004 | 10:52 PM

djfob

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Joined: Dec 2003

Posts: 3,089

Re:what causes blow-by?

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

Apr 28, 2004 | 09:11 AM

Semnos

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Joined: 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

Apr 28, 2004 | 10:06 AM

chingro

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Joined: 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.