Does anybody happen to know which way through the oil filter the flow direction is? does it go from inside (through the big central hole) to outside(out through the little holes round the edge) or outside to inside?! if you know what I mean! lol

 

I've got an incling but want to be 100% sure without the need for a practical and messy 'pipe removal test' lol

 

Reason incase you're wondering is I'm fitting a sandwich plate for bigger 1/2" oil cooler lines and also plumbing my accusump and one way valve in to prevent it pressurising the oil cooler and keep all that lovely back up oil going straight to the block.

IIRC there is a diagram in the online manual.

I would assume centre hole to outter small ones as the feed for the oil cooler is taken from the tree and well its the logical way lol. As I say though I assume.

I know that's what I have summised from looking at the oil tree. I have a block with the oil tree removed but still can't 100% confirm which way it goes. I need to be sure else I will potentially have a one way valve in my system the wrong way round! lol.

 

Jimmer should be able to answer this hopefully having done a lot of engine builds.

http://www.300zx-twinturbo.com/cgi-bin/manual.cgi?list=lc&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=4&design=default&total=15

Thanks for that, strange how the diagram appears to be the older Z31 engine but with two turbos, anyways it would appear that contrary to what we all thought the oil pump feeds the outer little holes in the filter then the central big hole goes straight to the main oil gallery.....I'll be doing some testing once my engine is back in to double check this though!

 

Thanks AndyP

I'm guessing it's a generic V6 z31/32 diagram that is in the Z32 manual. I don't have it to hand but I suspect the Z31 v6 manual will be similar (but with a single turbo).