Engine surging in between negative and positive manoeuvres

[terry livanidis]

Good morning all, couple of months ago, I put a post re oil pressure dropping and prop surging, someone spoke of an accumulator that might help.
Would anyone know what it looks like or how it gets built Any drawing of anything for a 360 Lycoming S2A ?
It would be much appreciated. We’re trying to sort out what could be happening as a precious dropping and staying there for 3 to 4 seconds.

 

[race38]

 

[armstrong8933]

 

[terry livanidis]

 

[terry livanidis]