FrontEngineDragsters.Org Forum
Technical => Matt Shaff's Engine Shop => Topic started by: spitzerscott on November 27, 2020, 01:13:21 PM
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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?
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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/