Dry sump venting open or closed.

[PLDRIVE]

If the engine goes from pulling a vacuum to positive pressure it could blow out a seal in the engine. The Peterson pop off spring pressure is more for catastrophic failure then repeated positive pressure cycles. My knowledge is not from personal experience, its from my engine builder (He builds dry sump engines on a weekly basis).

I would consider cost of a spring cheap insurance.

MP

[Ant]

Originally Posted by PLDRIVE

If the engine goes from pulling a vacuum to positive pressure it could blow out a seal in the engine. The Peterson pop off spring pressure is more for catastrophic failure then repeated positive pressure cycles. My knowledge is not from personal experience, its from my engine builder (He builds dry sump engines on a weekly basis).

I would consider cost of a spring cheap insurance.

MP

I gotcha and that makes sense. The valve cover pop off has a very light spring hardly enough to seat it so I guess that won't take much pressure to work..I might consider leaving that there, and if I want minimal vacuum I can adjust regulator down to 2"

[PLDRIVE]

Sounds like a plan

[PLDRIVE]

Ant

Spring can also be trimmed to make it a little softer without having to replace it.

Mark