Vapour from the breather pipe on top of my engine

[rippon91]

As above there is a considerable amount of vapid that has started coming from the breather on the right hand side of my rocker cover, there is no Pcv valve as it goes into a catch can, what could be the cause of this?

[Ollieh17]

Piston rings

[H_D]

vapour will be more visible in brighter light i.e sunlight... the whole point of the bigger breathers is to help crankcase vapours/gasses escape more efficiently.

I highly doubt its your piston rings unless if it actually spitting out oil from the breathers.

[Ollieh17]

Doesnt have to mean piston rings are complety gone..... Worn piston rings, more blow by, more vapour

[H_D]

best to do a compression test and report back

[5e colin]

just close your eyes its an old engine

[rippon91]

Cheers guys I'll get a compression test done but is it likely to damage it more by using it?

[rippon91]

Also I've read that it could be from bad grade fuel I.e supermarket fuel that I've just filled it up with, anyone believe this is possible?