Thursday 15 February 2018

Crank case breather - drilled PCV

Time for a change, another one that isn't because something is particularly wrong - but just to see what the difference is. My dipstick will jump out of position sometimes - I've no idea if thats positive crankcase pressure or vibration - it will be interesting if this change makes any difference.

Pulled and drilled through, rather cut the end off, the crank case breather PCV. Literally a 10 minute job with the Dremel.

The stock oil separator is still in place - but effectively more like a stand alone catch tank now with a wider unobstructed path, through the open PCV, up to the vent at the back of the cam cover. There should be a significant difference between the 6x 1-2mm holes in the end cap vs a direct open flow.

The only difference I'm expecting is perhaps a change in the volume of residue around the breather filter.

Original setup including the breather filter detailed here.

Update - tested the engine while completely blocking the PCV outlet - made no difference.  There is a little positive crankcase pressure, you can feel it 'puffing' against your finger. So all is good drilling out the PCV and it will stay like this.

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