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Positive pressure when oil cap off


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#1
osmyrn

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Noticed there was more air coming out the oil cap than I expected. I didn't expect there to be anything really. Took the oil cap off when I was out for a run at full temp, which isn't something I ever do, so no idea what it would 'usually' do. How much is normal, and what would it suggest if this is abnormal? Only engine mod I have is the mountune CAIS, so the k&n filter with the extended bit to the rocker cover.

 

Cheers.



#2
Sethorion

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Sounds like worn cylinders/pistons/rings.



#3
osmyrn

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Sounds like worn cylinders/pistons/rings.

It's only 60k miles so I feel like it's related to something else.



#4
Jamie1234

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Noticed there was more air coming out the oil cap than I expected. I didn't expect there to be anything really. Took the oil cap off when I was out for a run at full temp, which isn't something I ever do, so no idea what it would 'usually' do. How much is normal, and what would it suggest if this is abnormal? Only engine mod I have is the mountune CAIS, so the k&n filter with the extended bit to the rocker cover.
 
Cheers.


Completely normal , if there is excessive case pressure it would be pushing it through the breather system and burning it , would be a big blue cloud behind it too

#5
osmyrn

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Completely normal , if there is excessive case pressure it would be pushing it through the breather system and burning it , would be a big blue cloud behind it too

 

Cheers mate. Drives sweet as a nut and sounds all good so just thought I'd check



#6
_jimmy_

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Mine does this too, assumed it was a bit of wear but like you I had no idea what is considered normal
  • jase_llan and osmyrn like this




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