Why Are There 3 Piston Rings And What Is Blowby?

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Anonymous

Is there a point of blowby? And where do the gasses go as they only go down?

03/16/2016 - 16:58 |
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Anonymous

In reply to by Anonymous (not verified)

Blow by would indicate something has failed either a piston ring or scored piston liner,it is blown into the cracks case and either out the crank case breather pipe or dip stick hole.

03/16/2016 - 17:18 |
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Marius

In reply to by Anonymous (not verified)

You don’t want blowby, but there will always be a little bit since it’s impossible for the rings to seal 100%. Too much blowby would indicate worn cylinders and/or rings.

03/16/2016 - 17:57 |
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Anonymous

In reply to by Anonymous (not verified)

Blowby occurs all time past the rings into the Crankcase. Amount varies depending on load and engine speed. On diesel engines usually the breather and filter separate the oil from the combustion by products. The oil is routed back to the crankcase while the “cleaned” gases are either routed back to the intake or to the atmosphere depending on if it is a closed or an open crankcase system. Even on a brand new engine some amount of blowby is normal.

03/16/2016 - 22:58 |
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Anonymous

In reply to by Anonymous (not verified)

to the crankcase-oilpan-PCV-then goes back to the intake.

03/24/2016 - 18:49 |
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Anonymous

It becomes a problem when you have to check and replace oil level every week :(

03/16/2016 - 21:48 |
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Facundo Baln

Blowby is when you are doing a Flyby and blow the engine up.😂

03/17/2016 - 12:59 |
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ArturoS14

Another great video!

03/17/2016 - 19:22 |
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OffByOneError

That gas is “going for the gap that exists” :D

03/19/2016 - 20:58 |
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Anonymous

Blow by is why most engines have pcv valves to reduce crank case pressure caused by blow by

03/20/2016 - 05:35 |
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