Technical > Matt Shaff's Engine Shop

Vaccuum Pumps

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spitzerscott:
I am putting a Moroso 3 vane vacuum pump on my 336 SBC alcohol engine. Can anyone tell me about how many inches of vacuum I will want to pull?

MaggiFinn:
Here's a note from David Reher, of Reher-Morrison

On the dyno, we see fluctuations in oil pressure when the crankcase vacuum approaches 15 inches with a wet-sump system. We use an adjustable air bleed (essentially a controlled leak) to regulate the maximum pan vacuum to between 10 and 12 inches. With the wet-sump system we install on our Super Series bracket racing big-blocks, we see no fluctuations in oil pressure at this vacuum.

https://rehermorrison.com/tech-talk-24-panning-for-power/

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