FrontEngineDragsters.Org Forum

Technical => Matt Shaff's Engine Shop => Topic started by: spitzerscott on November 27, 2020, 01:13:21 PM

Title: Vaccuum Pumps
Post by: spitzerscott on November 27, 2020, 01:13:21 PM
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?
Title: Re: Vaccuum Pumps
Post by: MaggiFinn on November 27, 2020, 02:41:44 PM
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/